Compass-2: Effects of the Combination of Bosentan and Sildenafil Versus Sildenafil Monotherapy on Pulmonary Arterial Hypertension (PAH)

Sponsor
Actelion (Industry)
Overall Status
Completed
CT.gov ID
NCT00303459
Collaborator
(none)
334
68
2
91
4.9
0.1

Study Details

Study Description

Brief Summary

COMPASS-2 is a Phase 4, prospective, randomized, double-blind, placebo-controlled, event-driven study evaluating the effect of bosentan on the time to first confirmed morbidity/mortality event in patients with symptomatic PAH already receiving sildenafil therapy. Patients must have been receiving doses of sildenafil equal to or greater than 20 mg t.i.d. for at least 12 weeks prior to being randomized.

The study continued until the predefined target number of morbidity/mortality events was reached.

Condition or Disease Intervention/Treatment Phase
Phase 4

Study Design

Study Type:
Interventional
Actual Enrollment :
334 participants
Allocation:
Randomized
Intervention Model:
Parallel Assignment
Masking:
Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose:
Treatment
Official Title:
Effects of Combination of Bosentan and Sildenafil Versus Sildenafil Monotherapy on Morbidity and Mortality in Symptomatic Patients With Pulmonary Arterial Hypertension - A Multicenter, Double-blind, Randomized, Placebo-controlled, Parallel Group, Prospective, Event Driven Phase IV Study
Study Start Date :
May 1, 2006
Actual Primary Completion Date :
Dec 1, 2013
Actual Study Completion Date :
Dec 1, 2013

Arms and Interventions

Arm Intervention/Treatment
Experimental: A

Bosentan

Drug: bosentan
bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d.

Placebo Comparator: B

Placebo

Drug: placebo
Matching bosentan placebo/b.i.d.

Outcome Measures

Primary Outcome Measures

  1. Time to First Confirmed Morbidity/Mortality Event up to the End of Study [From baseline to end of study, approximately 86 months]

    Kaplan-Meier estimate of percentage of participants without a morbidity/mortality event. A morbidity/mortality event is defined as the occurrence of a) death, b) hospitalization for worsening or complication of PAH or intravenous prostanoid initiation, c) atrial septostomy, d) lung transplantation, or e) worsening PAH, defined as "moderately" or "markedly" worsened PAH symptoms using a patient global self-assessment (PGSA) scale AND initiation of inhaled or subcutaneous prostanoids or the disease progression package (open-label bosentan). If a patient replied "no change" or "mildly worse" on the PGSA, a decrease in 6MWT of 20% versus last visit or 30% versus baseline is also required to confirm the event.

Secondary Outcome Measures

  1. Time to First Confirmed Death, Hospitalization for Worsening or Complication of PAH or Initiation of Intravenous Prostanoids, Atrial Septostomy, or Lung Transplantation [Baseline to end of study, approximately 86 months]

    Kaplan-Meier estimate of percentage of participants without an event of death, hospitalization (for worsening or complication of PAH or initiation of intravenous prostanoids), atrial septostomy or lung transplantation. Time to first confirmed death, hospitalization (for worsening or complication of PAH or initiation of intravenous prostanoids), atrial septostomy or lung transplantation from baseline to end of study was confirmed by an independent Clinical Endpoint Committee.

  2. Change From Baseline to Week 16 in 6 Minute Walk Test (6MWT) [From baseline to week 16]

    The 6MWT is a non-encouraged test, which measures the distance covered over a 6 minute walk; the patient is instructed to walk as far as possible in a 30 m long flat corridor, back and forth around two cones, with the permission to slow down, rest, or stop if needed. Areas were to be well ventilated with air temperature controlled between 20 °C and 23 °C (68 °F to 76 °F). The test was to be administered at the same time of day and by the same tester throughout the study. The tester measured the distance walked by non-encouraged patients during the timed 6 minute period.

  3. Number of Participants With Improved, No Change, or Worsened World Health Organisation Functional Class From Baseline to Week 16 [From baseline to Week 16]

    Class I: no limitation of usual physical activity (PA) which does not increase dyspnea, fatigue, chest pain, or presyncope. Class II: mild limitation of PA. No discomfort at rest. Normal PA increases dyspnea, fatigue, chest pain, or presyncope. Class III: marked limitation of PA. No discomfort at rest. Less than ordinary activity increases dyspnea, fatigue, chest pain, or presyncope. Class IV: unable to perform any PA and who may have signs of right ventricular failure. Dyspnea and/or fatigue may be present at rest and symptoms are increased by almost any PA.

  4. Time to Death of All Causes From Baseline to End of Study [Baseline to End of Study, approximately 86 months]

    Kaplan-Meier estimate of percentage of participants without a mortality event.Time to death due to any cause.

  5. Adjusted Percentage Ratio From Baseline in N-terminal Pro-B-type Natriuretic Peptide (NT-pro-BNP) [Baseline to Month 20]

    Blood sampling for the measurement of NT-pro-BNP was performed and the plasma concentrations of NT-pro-BNP were determined by a certified centralized laboratory.

  6. Change From Baseline to Week 16 in Borg Dyspnea Index [Baseline to Week 16]

    The Borg dyspnea index was evaluated immediately after the 6MWT to obtain a rating of dyspnea at the end of the exercise using a scale from 0 ('Nothing at all') to 10 ('Very, very severe - maximal').

  7. Change From Baseline to Week 16 in the EuroQol 5 Dimensions (EQ-5D) Questionnaire Calculated Score [From baseline to Week 16]

    The EQ-5D questionnaire is a patient-reported outcome consisting of a 5 dimensional descriptive system and a visual analog scale (VAS). The descriptive system asks respondents to describe their health status. Health is defined in 5 dimensions: (1) mobility, (2) self care, (3) usual activities, (4) pain or discomfort, and (5) anxiety or depression. Each dimension is divided into 3 levels, indicating (a) no problem, (b) some or moderate problems, or (c) extreme problems. Respondents record their problem(s) in each of the 5 dimensions. Combinations of these levels define a total of 243 health states. A health state defined by the descriptive system of EQ-5D can be described by a 5-digit number with full health is indicated by 11111 and poorest health state by 33333. The EQ-5D calculated score was derived by re-assigning local scores for answers to each question and combining these local scores into a global score with ranges from 0 (worst possible outcome) to 1 (best possible outcome).

  8. Change From Baseline to Week 16 in the EuroQol 5 Dimensions (EQ-5D) Visual Analogue Scale Score [Baseline to Week 16]

    The EQ-5D questionnaire is a patient-reported outcome consisting of a 5 dimensional descriptive system and a visual analog scale (VAS) together with brief demographic questions. EQ-5D VAS asks respondents to rate their perception of their overall health on a vertical visual analogue scale with 'best imaginable health state' set at 100 and 'worst imaginable health state' set at 0.

  9. Patient Global Self Assessment (PGSA) Status at Week 16 [Week 16]

    The PGSA is a questionnaire that allows the patient to compare his/her PAH status in response to the question "How do you feel about your PAH today compared with your last visit?" asked by the investigator. Patients use a seven-point scale to respond: markedly better, moderately better, mildly better, no change, markedly worse, moderately worse, or mildly worse.

Eligibility Criteria

Criteria

Ages Eligible for Study:
12 Years and Older
Sexes Eligible for Study:
All
Accepts Healthy Volunteers:
No
Inclusion Criteria:
  1. Signed informed consent prior to initiation of any study-mandated procedure

  2. Males or females >=12 years of age (except for countries where this age limit is contrary to specific regulatory requirements).

  • Women of childbearing potential must have a negative pretreatment pregnancy test and must use a reliable method of contraception during study treatment and for at least 3 months after study treatment termination.

·Reliable methods of contraception are:

O Barrier type devices (e.g., female condom, diaphragm, contraceptive sponge) only in combination with a spermicide.

O Intrauterine devices. O Oral, transdermal, injectable or implantable contraceptives only in combination with a barrier method.

  • Hormone-based contraceptives alone, regardless of the route of administration, are not considered as reliable methods of contraception.

  • Abstention, rhythm method, and contraception by the partner alone are not acceptable methods of contraception.

  • Women not of childbearing potential are defined as postmenopausal (i.e., amenorrhea for at least 1 year), or documented surgically or naturally sterile.

  1. Patients with symptomatic PAH

  2. Patients with the following types of PAH belonging to WHO Group I:

  • Idiopathic (IPAH)

  • Familial (FPAH)

  • Associated with (APAH):

  1. Collagen vascular disease with normal left ventricular function (ejection fraction (EF) > 50%) ii. Congenital systemic-to-pulmonary shunts at least 2 years post surgical repair iii. Drugs and toxins
  1. PAH diagnosed by right heart catheter showing:
  • Mean pulmonary arterial pressure (mPAP) >= 25 mm Hg AND

  • Pulmonary capillary wedge pressure (PCWP) =< 15 mm Hg or left ventricular end diastolic pressure (LVEDP) =< 15 mmHg If both PCWP and LVEDP are available then the LVEDP value is retained for inclusion.

  1. Treatment with a stable dose of sildenafil equal to or greater than 20 mg t.i.d. for at least 12 weeks prior to randomization (no sildenafil dosage adjustment should occur in this period) 7)150 m =< 6-minute walk test (6MWT) =< 480 m, documented by 2 tests with second 6MWT within 15% of first 6MWT distance or a third test required
Exclusion Criteria :
  1. PAH belonging to WHO group II-V

  2. PAH associated with portal hypertension and HIV infection

  3. PAH associated with thyroid disorders, glycogen storage disease, Gaucher disease, hereditary hemorrhagic telangiectasia, hemoglobinopathies, myeloproliferative disorders and splenectomy

  4. PAH associated with significant venous or capillary involvement (PCWP > 15 mmHg): pulmonary veno-occlusive disease and pulmonary capillary hemangiomatosis

  5. Persistent pulmonary hypertension of the newborn

  6. Significant valvular disease with valvular lesions to be excluded by echocardiogram within 2 years prior to randomization (i.e. patients with tricuspid or pulmonary insufficiency secondary to PAH can be included)

  7. Restrictive lung disease: total lung capacity (TLC) < 60% of normal predicted value (see Appendix 3)

  8. Obstructive lung disease: forced expiratory volume/forced vital capacity (FEV1/FVC) < 0.5

  9. Moderate to severe hepatic impairment, i.e., Child-Pugh Class B or C

  10. Known HIV infection

  11. Acute or chronic impairment (other than dyspnea), limiting the ability to comply with study requirements or that may interfere with the safety or the evaluation of the study, such as chronic infection, chronic renal failure etc.

  12. Psychotic, addictive or other disorder limiting the ability to provide informed consent or to comply with study requirements

  13. Pregnancy or breast-feeding

  14. Condition that prevents compliance with the protocol or adherence to therapy

  15. Systolic blood pressure < 85 mmHg

  16. Body weight < 40 kg

  17. Hemoglobin <75% of the lower limit of the normal range

  18. Aspartate aminotransferase (AST) and/or alanine aminotransferase (ALT) > 1.5 times the upper limit of normal ranges

  19. Known hypersensitivity or history of drug-related adverse events with bosentan (e.g. increase in liver function test results), or any of the excipients of its formulation

  20. Receipt of an investigational product other than sildenafil within 3 months before start of study treatment

  21. Treatment with endothelin receptor antagonists (ERAs), prostanoids or phosphodiesterase (PDE) 5 inhibitors other than sildenafil within 3 months prior to randomization

  22. Concomitant systemic treatment within 1 week prior to randomization with

  • calcineurin inhibitors (e.g., cyclosporine A and tacrolimus), sirolimus and everolimus

  • glibenclamide (glyburide)

  • both cytochrome P2C9 (CYP2C9) and cytochrome P3A4 (CYP3A4) (e.g., fluconazole, amiodarone, voriconazole)

  • combination of drugs that inhibit CYP2C9 and CYP3A4

  1. Treatment with nitrates and alpha-blockers at time of randomization

  2. In the opinion of the investigator - patients in need for treatment with any prostanoid up to Visit 4

  3. Significant left ventricular dysfunction

Contacts and Locations

Locations

Site City State Country Postal Code
1 UCSD Medical Center, Thornton Hospital La Jolla California United States 92037-7381
2 Greater Los Angeles VA Medical Center Los Angeles California United States 90073
3 University of California (UC) Davis Health System Sacramento California United States 95817
4 UCSF San Francisco California United States 94143
5 University of Colorado Health Sciences Center Denver Colorado United States 80220
6 University of Connecticut Farmington Connecticut United States 06030
7 Yale University School of Medicine, Dept. of Internal Medicine, Pulmonary & Critical Care New Haven Connecticut United States 06520-8057
8 Bay Area Chest Physicians Clearwater Florida United States 33756
9 Shands Hospital at the University of Florida Gainesville Florida United States 30067
10 University of Florida - Jacksonville Jacksonville Florida United States 32209
11 Mayo Clinic Jacksonville Jacksonville Florida United States 32224
12 Winthrop University Hospital Mineola Georgia United States 30067
13 University of Iowa Pulmonary Hypertension Program Iowa City Iowa United States 52242
14 University of Kansas Medical Center Kansas City Kansas United States 66160
15 UK Medical Center - University of Kentucky Lexington Kentucky United States 40536-0294
16 University of Maryland - School of Medicine Baltimore Maryland United States 21201-1595
17 Johns Hopkins University Baltimore Maryland United States 21205
18 Tufts - New England Medical Center Boston Massachusetts United States 02111
19 University of Michigan Cardiology Ann Arbor Michigan United States 48109
20 Harper University Hospital - Wayne State University Detroit Michigan United States 48201
21 Spectrum Health Research Department Grand Rapids Michigan United States 49525
22 University of Minnesota Department of Medicine - Cardiovascular Division Minneapolis Minnesota United States 55455
23 Mayo Clinic Rochester Minnesota United States 55905
24 St. Luke's Hospital Chesterfield Missouri United States 63017
25 Washington University St. Louis Missouri United States 63110
26 Dartmouth Hitchcock Medical Center Lebanon New Hampshire United States 03756-0001
27 Duke University Medical Center (DUMC) Durham North Carolina United States 27710
28 Lindner Clinical Trials Center Cincinnati Ohio United States 45219
29 The Cleveland Clinic Foundation Cleveland Ohio United States 44195
30 Ohio State University - Pulmonary Clinical Trials Office - Martha Morehouse Medical Plaza Columbus Ohio United States 43210
31 The Oregon Clinic - Pulmonary and Critical Care Medicine Portland Oregon United States 97220
32 Allegheny General Hospital Pittsburgh Pennsylvania United States 15212
33 University of Pittsburgh Medical Center - Presbyterian Cardiovascular Institute Pittsburgh Pennsylvania United States 15213
34 Medical University of South Carolina (MUSC) Charleston South Carolina United States 29425
35 Mid Carolina Internal Medicine Lexington South Carolina United States 29072
36 South Carolina Pharmaceutical Research Spartanburg South Carolina United States 29303
37 University of Texas Medical Branch Galveston Texas United States 77555-0561
38 Baylor Clinic Houston Texas United States 77030
39 Inova Fairfax Hospital Falls Church Virginia United States 22042-3300
40 Froedtert Memorial Lutheran Hospital Milwaukee Wisconsin United States 53226
41 Hospital de Messejana Fortaleza CE Brazil 60864-190
42 Hospital Universitário de Brasília Brasília DF Brazil 70840-050
43 Hospital das Clínicas - UFMG Belo Horizonte MG Brazil 30130-100
44 Hospital Madre Teresa Belo Horizonte Brazil 30430-142
45 CHSCPA Porto Alegre Brazil 90020-090
46 Instituto Dante Pazzanese Sao Paulo Brazil 04012-909
47 UNIFESP - Pneumologia Sao Paulo Brazil 04023-062
48 Hospital das Clínicas - FMUSP Sao Paulo Brazil 05403-000
49 Vseobecna Fakultni Nemocnice Praha Czech Republic 128 08
50 Kardiologicka klinika Videnska Praha Czech Republic 140 21
51 Rigshospitalet Copenhagen Denmark 2100
52 Universitätsklinikum Giessen und Marburg, Standort Giessen Zentrum für Innere Medizin Giessen Germany 35392
53 Medizinische Hochschule Hannover Hannover Germany 30625
54 Medizinische Klinik der Universitat Innere Medizin III Heidelberg Germany 69120
55 Klinik Lowenstein GmbH Loewenstein Germany 74245
56 Universitatsklinikum Regensburg Regensburg Germany 93053
57 General Hospital Alexandra Athens Greece 11528
58 University General Hospital "Attikon" Athens Greece 12462
59 Rio University Hospital Patras Greece
60 Universidade de Coimbra Coimbra Portugal 3000-076
61 Hospital de Santa Maria Lisbon Portugal 1649-035
62 Riyadh Military Hospital Riyadh Saudi Arabia 11159
63 NUSCH, a.s. Bratislava Slovakia
64 Vychodoslovensky ustav srdcovych a cievnych chorob, a.s. Kosice Slovakia
65 Hospital Universitario Insular de Gran Canaria Las Palmas de Gran Canaria Spain 35016
66 Hospital Universitario 12 Octubre Madrid Spain 28041
67 Sahlgrenska University Hospital Gothenburg Sweden
68 Royal Hallamshire Hospital Sheffield United Kingdom S102JF

Sponsors and Collaborators

  • Actelion

Investigators

None specified.

Study Documents (Full-Text)

None provided.

More Information

Additional Information:

Publications

None provided.
Responsible Party:
Actelion
ClinicalTrials.gov Identifier:
NCT00303459
Other Study ID Numbers:
  • AC-052-414
  • COMPASS-2
First Posted:
Mar 17, 2006
Last Update Posted:
Nov 11, 2015
Last Verified:
Oct 1, 2015

Study Results

Participant Flow

Recruitment Details First subject, first visit was17 May 2006 and last subject, last visit was 05 Dec 2013.
Pre-assignment Detail There was a screening period of up to 14 days to assess eligibility. A total of 377 patients were screened.
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet, twice a day (b.i.d.) for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Period Title: Overall Study
STARTED 159 175
COMPLETED 76 86
NOT COMPLETED 83 89

Baseline Characteristics

Arm/Group Title Bosentan Placebo Total
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d. Total of all reporting groups
Overall Participants 159 175 334
Age (years) [Mean (Standard Deviation) ]
Mean (Standard Deviation) [years]
52.9
(15.44)
54.7
(15.73)
53.9
(15.60)
Sex: Female, Male (Count of Participants)
Female
125
78.6%
128
73.1%
253
75.7%
Male
34
21.4%
47
26.9%
81
24.3%
Race/Ethnicity, Customized (participants) [Number]
Caucasian/White
147
92.5%
149
85.1%
296
88.6%
Black
7
4.4%
12
6.9%
19
5.7%
Hispanic
5
3.1%
6
3.4%
11
3.3%
Other
0
0%
8
4.6%
8
2.4%
Region of Enrollment (participants) [Number]
Brazil
36
22.6%
35
20%
71
21.3%
Czech Republic
12
7.5%
15
8.6%
27
8.1%
Denmark
3
1.9%
4
2.3%
7
2.1%
Germany
19
11.9%
22
12.6%
41
12.3%
Greece
4
2.5%
5
2.9%
9
2.7%
Portugal
3
1.9%
0
0%
3
0.9%
Saudi Arabia
0
0%
1
0.6%
1
0.3%
Slovakia
4
2.5%
3
1.7%
7
2.1%
Spain
1
0.6%
1
0.6%
2
0.6%
Sweden
4
2.5%
5
2.9%
9
2.7%
United Kingdom
0
0%
1
0.6%
1
0.3%
United States
73
45.9%
83
47.4%
156
46.7%

Outcome Measures

1. Primary Outcome
Title Time to First Confirmed Morbidity/Mortality Event up to the End of Study
Description Kaplan-Meier estimate of percentage of participants without a morbidity/mortality event. A morbidity/mortality event is defined as the occurrence of a) death, b) hospitalization for worsening or complication of PAH or intravenous prostanoid initiation, c) atrial septostomy, d) lung transplantation, or e) worsening PAH, defined as "moderately" or "markedly" worsened PAH symptoms using a patient global self-assessment (PGSA) scale AND initiation of inhaled or subcutaneous prostanoids or the disease progression package (open-label bosentan). If a patient replied "no change" or "mildly worse" on the PGSA, a decrease in 6MWT of 20% versus last visit or 30% versus baseline is also required to confirm the event.
Time Frame From baseline to end of study, approximately 86 months

Outcome Measure Data

Analysis Population Description
All randomized set
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 159 175
Kaplan-Meier estimate at Month 4
96.1
60.4%
90.6
51.8%
Kaplan-Meier estimate at Month 8
90.5
56.9%
83.0
47.4%
Kaplan-Meier estimate at Month 12
82.7
52%
74.0
42.3%
Kaplan-Meier estimate at Month 16
74.7
47%
71.0
40.6%
Kaplan-Meier estimate at Month 20
71.8
45.2%
66.1
37.8%
Kaplan-Meier estimate at Month 24
66.6
41.9%
61.5
35.1%
Kaplan-Meier estimate at Month 28
65.8
41.4%
55.0
31.4%
Kaplan-Meier estimate at Month 32
62.4
39.2%
52.7
30.1%
Kaplan-Meier estimate at Month 34
57.5
36.2%
48.8
27.9%
Kaplan-Meier estimate at Month 40
56.4
35.5%
48.0
27.4%
Kaplan-Meier estimate at Month 44
50.6
31.8%
46.2
26.4%
Kaplan-Meier estimate at Month 48
46.7
29.4%
45.2
25.8%
Kaplan-Meier estimate at Month 52
45.1
28.4%
45.2
25.8%
Kaplan-Meier estimate at Month 56
45.1
28.4%
42.6
24.3%
Kaplan-Meier estimate at Month 60
45.1
28.4%
39.7
22.7%
Kaplan-Meier estimate at Month 64
45.1
28.4%
39.7
22.7%
Kaplan-Meier estimate at Month 68
40.1
25.2%
39.7
22.7%
Kaplan-Meier estimate at Month 72
40.1
25.2%
39.7
22.7%
Kaplan-Meier estimate at Month 76
40.1
25.2%
36.1
20.6%
Kaplan-Meier estimate at Month 80
40.1
25.2%
36.1
20.6%
Kaplan-Meier estimate at Month 84
40.1
25.2%
36.1
20.6%
Kaplan-Meier estimate at End of Study
40.1
25.2%
36.1
20.6%
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 0.2508
Comments
Method Log Rank
Comments
Method of Estimation Estimation Parameter Hazard Ratio (HR)
Estimated Value 0.831
Confidence Interval (2-Sided) 97.31%
0.582 to 1.187
Parameter Dispersion Type:
Value:
Estimation Comments
2. Secondary Outcome
Title Time to First Confirmed Death, Hospitalization for Worsening or Complication of PAH or Initiation of Intravenous Prostanoids, Atrial Septostomy, or Lung Transplantation
Description Kaplan-Meier estimate of percentage of participants without an event of death, hospitalization (for worsening or complication of PAH or initiation of intravenous prostanoids), atrial septostomy or lung transplantation. Time to first confirmed death, hospitalization (for worsening or complication of PAH or initiation of intravenous prostanoids), atrial septostomy or lung transplantation from baseline to end of study was confirmed by an independent Clinical Endpoint Committee.
Time Frame Baseline to end of study, approximately 86 months

Outcome Measure Data

Analysis Population Description
All randomized set
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 159 175
Kaplan-Meier estimate at Month 4
97.4
61.3%
95.3
54.5%
Kaplan-Meier estimate at Month 8
94.6
59.5%
91.8
52.5%
Kaplan-Meier estimate at Month 12
89.6
56.4%
88.8
50.7%
Kaplan-Meier estimate at Month 16
85.3
53.6%
86.9
49.7%
Kaplan-Meier estimate at Month 20
82.3
51.8%
83.8
47.9%
Kaplan-Meier estimate at Month 24
76.9
48.4%
79.8
45.6%
Kaplan-Meier estimate at Month 28
76.1
47.9%
74.7
42.7%
Kaplan-Meier estimate at Month 32
75.2
47.3%
73.1
41.8%
Kaplan-Meier estimate at Month 36
72.2
45.4%
64.4
36.8%
Kaplan-Meier estimate at Month 40
72.2
45.4%
61.9
35.4%
Kaplan-Meier estimate at Month 44
64.2
40.4%
60.1
34.3%
Kaplan-Meier estimate at Month 48
60.3
37.9%
58.1
33.2%
Kaplan-Meier estimate at Month 52
57.4
36.1%
56.8
32.5%
Kaplan-Meier estimate at Month 56
53.8
33.8%
52.7
30.1%
Kaplan-Meier estimate at Month 60
53.8
33.8%
51.3
29.3%
Kaplan-Meier estimate at Month 64
53.8
33.8%
51.3
29.3%
Kaplan-Meier estimate at Month 68
39.8
25%
49.2
28.1%
Kaplan-Meier estimate at Month 72
39.8
25%
49.2
28.1%
Kaplan-Meier estimate at Month 76
39.8
25%
45.1
25.8%
Kaplan-Meier estimate at Month 80
39.8
25%
45.1
25.8%
Kaplan-Meier estimate at Month 84
39.8
25%
45.1
25.8%
Kaplan-Meier estimate at End of Study
39.8
25%
45.1
25.8%
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 0.8385
Comments
Method Log Rank
Comments
Method of Estimation Estimation Parameter Hazard Ratio (HR)
Estimated Value 0.963
Confidence Interval (2-Sided) 95%
0.673 to 1.380
Parameter Dispersion Type:
Value:
Estimation Comments
3. Secondary Outcome
Title Change From Baseline to Week 16 in 6 Minute Walk Test (6MWT)
Description The 6MWT is a non-encouraged test, which measures the distance covered over a 6 minute walk; the patient is instructed to walk as far as possible in a 30 m long flat corridor, back and forth around two cones, with the permission to slow down, rest, or stop if needed. Areas were to be well ventilated with air temperature controlled between 20 °C and 23 °C (68 °F to 76 °F). The test was to be administered at the same time of day and by the same tester throughout the study. The tester measured the distance walked by non-encouraged patients during the timed 6 minute period.
Time Frame From baseline to week 16

Outcome Measure Data

Analysis Population Description
All randomized set
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 159 175
Baseline
363
(78.5)
358
(73.1)
Week 16
370
(98.3)
343
(107.3)
Change from baseline
7.2
(66.01)
-14.6
(80.42)
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 0.0106
Comments
Method Wilcoxon (Mann-Whitney)
Comments
Method of Estimation Estimation Parameter Mean Difference (Net)
Estimated Value 21.8
Confidence Interval (2-Sided) 95%
5.9 to 37.8
Parameter Dispersion Type:
Value:
Estimation Comments
4. Secondary Outcome
Title Number of Participants With Improved, No Change, or Worsened World Health Organisation Functional Class From Baseline to Week 16
Description Class I: no limitation of usual physical activity (PA) which does not increase dyspnea, fatigue, chest pain, or presyncope. Class II: mild limitation of PA. No discomfort at rest. Normal PA increases dyspnea, fatigue, chest pain, or presyncope. Class III: marked limitation of PA. No discomfort at rest. Less than ordinary activity increases dyspnea, fatigue, chest pain, or presyncope. Class IV: unable to perform any PA and who may have signs of right ventricular failure. Dyspnea and/or fatigue may be present at rest and symptoms are increased by almost any PA.
Time Frame From baseline to Week 16

Outcome Measure Data

Analysis Population Description
All randomized set
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 159 175
Improved
25
15.7%
28
16%
No change
121
76.1%
130
74.3%
Worsened
13
8.2%
17
9.7%
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 1.0000
Comments
Method Fisher Exact
Comments
Method of Estimation Estimation Parameter Relative risk of improvement
Estimated Value 0.98
Confidence Interval (2-Sided) 95%
0.60 to 1.61
Parameter Dispersion Type:
Value:
Estimation Comments
5. Secondary Outcome
Title Time to Death of All Causes From Baseline to End of Study
Description Kaplan-Meier estimate of percentage of participants without a mortality event.Time to death due to any cause.
Time Frame Baseline to End of Study, approximately 86 months

Outcome Measure Data

Analysis Population Description
All randomized set
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 159 175
Kaplan-Meier estimate at Month 4
99.4
62.5%
98.2
56.1%
Kaplan-Meier estimate at Month 8
98.7
62.1%
95.8
54.7%
Kaplan-Meier estimate at Month 12
96.5
60.7%
94.0
53.7%
Kaplan-Meier estimate at Month 16
92.8
58.4%
92.8
53%
Kaplan-Meier estimate at Month 20
90.6
57%
89.5
51.1%
Kaplan-Meier estimate at Month 24
89.1
56%
88.2
50.4%
Kaplan-Meier estimate at Month 28
85.8
54%
85.9
49.1%
Kaplan-Meier estimate at Month 32
85.8
54%
84.3
48.2%
Kaplan-Meier estimate at Month 36
85.8
54%
78.5
44.9%
Kaplan-Meier estimate at Month 40
85.8
54%
76.8
43.9%
Kaplan-Meier estimate at Month 44
81.4
51.2%
74.9
42.8%
Kaplan-Meier estimate at Month 48
77.7
48.9%
71.8
41%
Kaplan-Meier estimate at Month 52
75.0
47.2%
70.5
40.3%
Kaplan-Meier estimate at Month 56
70.1
44.1%
66.4
37.9%
Kaplan-Meier estimate at Month 60
67.8
42.6%
64.9
37.1%
Kaplan-Meier estimate at Month 64
67.8
42.6%
64.9
37.1%
Kaplan-Meier estimate at Month 68
67.8
42.6%
64.9
37.1%
Kaplan-Meier estimate at Month 72
67.8
42.6%
64.9
37.1%
Kaplan-Meier estimate at Month 76
67.8
42.6%
60.3
34.5%
Kaplan-Meier estimate at Month 80
58.1
36.5%
60.3
34.5%
Kaplan-Meier estimate at Month 84
58.1
36.5%
60.3
34.5%
Kaplan-Meier estimate at End of Study
58.1
36.5%
60.3
34.5%
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 0.4974
Comments
Method Log Rank
Comments
Method of Estimation Estimation Parameter Hazard Ratio (HR)
Estimated Value 0.855
Confidence Interval (2-Sided) 95%
0.544 to 1.344
Parameter Dispersion Type:
Value:
Estimation Comments
6. Secondary Outcome
Title Adjusted Percentage Ratio From Baseline in N-terminal Pro-B-type Natriuretic Peptide (NT-pro-BNP)
Description Blood sampling for the measurement of NT-pro-BNP was performed and the plasma concentrations of NT-pro-BNP were determined by a certified centralized laboratory.
Time Frame Baseline to Month 20

Outcome Measure Data

Analysis Population Description
All randomized patients with a baseline and at least one post-baseline value. Assessments considered are those where at least 60% of the patients have a post-baseline value
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet, b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 109 117
Month 1 to Baseline
87.46
110.02
Month 4 to Baseline
92.65
113.20
Month 8 to Baseline
85.21
122.87
Month 12 to Baseline
84.48
132.11
Month 16 to Baseline
92.69
129.92
Month 20 to Baseline
98.36
143.17
Treatment effect over 20 months
92.54
121.00
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 0.0003
Comments
Method Repeated measures analysis
Comments
Method of Estimation Estimation Parameter Percentage change over placebo
Estimated Value -23.52
Confidence Interval (2-Sided) 95%
-33.69 to -11.79
Parameter Dispersion Type:
Value:
Estimation Comments
7. Secondary Outcome
Title Change From Baseline to Week 16 in Borg Dyspnea Index
Description The Borg dyspnea index was evaluated immediately after the 6MWT to obtain a rating of dyspnea at the end of the exercise using a scale from 0 ('Nothing at all') to 10 ('Very, very severe - maximal').
Time Frame Baseline to Week 16

Outcome Measure Data

Analysis Population Description
All randomized set
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 159 175
Baseline
3.5
(1.99)
3.7
(2.18)
Week 16
3.4
(2.12)
3.6
(2.24)
Change from baseline
-0.09
(1.693)
-0.08
(2.035)
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 0.9566
Comments
Method Wilcoxon (Mann-Whitney)
Comments
Method of Estimation Estimation Parameter Mean Difference (Net)
Estimated Value -0.01
Confidence Interval (2-Sided) 95%
-0.42 to 0.39
Parameter Dispersion Type:
Value:
Estimation Comments
8. Secondary Outcome
Title Change From Baseline to Week 16 in the EuroQol 5 Dimensions (EQ-5D) Questionnaire Calculated Score
Description The EQ-5D questionnaire is a patient-reported outcome consisting of a 5 dimensional descriptive system and a visual analog scale (VAS). The descriptive system asks respondents to describe their health status. Health is defined in 5 dimensions: (1) mobility, (2) self care, (3) usual activities, (4) pain or discomfort, and (5) anxiety or depression. Each dimension is divided into 3 levels, indicating (a) no problem, (b) some or moderate problems, or (c) extreme problems. Respondents record their problem(s) in each of the 5 dimensions. Combinations of these levels define a total of 243 health states. A health state defined by the descriptive system of EQ-5D can be described by a 5-digit number with full health is indicated by 11111 and poorest health state by 33333. The EQ-5D calculated score was derived by re-assigning local scores for answers to each question and combining these local scores into a global score with ranges from 0 (worst possible outcome) to 1 (best possible outcome).
Time Frame From baseline to Week 16

Outcome Measure Data

Analysis Population Description
All randomized set
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 159 175
Baseline
0.678
(0.2172)
0.681
(0.2138)
Week 16
0.662
(0.2807)
0.645
(0.3062)
Change from Baseline
-0.0161
(0.25232)
-0.0361
(0.26671)
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 0.5571
Comments
Method Wilcoxon (Mann-Whitney)
Comments
Method of Estimation Estimation Parameter Mean Difference (Net)
Estimated Value 0.020
Confidence Interval (2-Sided) 95%
-0.036 to 0.076
Parameter Dispersion Type:
Value:
Estimation Comments
9. Secondary Outcome
Title Change From Baseline to Week 16 in the EuroQol 5 Dimensions (EQ-5D) Visual Analogue Scale Score
Description The EQ-5D questionnaire is a patient-reported outcome consisting of a 5 dimensional descriptive system and a visual analog scale (VAS) together with brief demographic questions. EQ-5D VAS asks respondents to rate their perception of their overall health on a vertical visual analogue scale with 'best imaginable health state' set at 100 and 'worst imaginable health state' set at 0.
Time Frame Baseline to Week 16

Outcome Measure Data

Analysis Population Description
All randomized set
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 159 175
Baseline
67
(17.4)
64
(17.5)
Week 16
69
(19.9)
66
(19.9)
Change from Baseline
2.1
(18.83)
2.0
(17.01)
Statistical Analysis 1
Statistical Analysis Overview Comparison Group Selection Bosentan, Placebo
Comments
Type of Statistical Test Superiority or Other
Comments
Statistical Test of Hypothesis p-Value 0.4086
Comments
Method Wilcoxon (Mann-Whitney)
Comments
Method of Estimation Estimation Parameter Mean Difference (Net)
Estimated Value 0.2
Confidence Interval (2-Sided) 95%
-3.7 to 4.0
Parameter Dispersion Type:
Value:
Estimation Comments
10. Secondary Outcome
Title Patient Global Self Assessment (PGSA) Status at Week 16
Description The PGSA is a questionnaire that allows the patient to compare his/her PAH status in response to the question "How do you feel about your PAH today compared with your last visit?" asked by the investigator. Patients use a seven-point scale to respond: markedly better, moderately better, mildly better, no change, markedly worse, moderately worse, or mildly worse.
Time Frame Week 16

Outcome Measure Data

Analysis Population Description
All randomized set, patients who completed the assessment
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
Measure Participants 150 162
Markedly better
24
15.1%
13
7.4%
Moderately better
23
14.5%
30
17.1%
Mildly better
32
20.1%
36
20.6%
No change
50
31.4%
59
33.7%
Mildly worse
16
10.1%
15
8.6%
Moderately worse
3
1.9%
5
2.9%
Markedly worse
2
1.3%
4
2.3%

Adverse Events

Time Frame Up to End of Study and up to 1 day after discontinuation of study treatment, approximately 86 weeks
Adverse Event Reporting Description All treated patients. Treatment emergent adverse events.
Arm/Group Title Bosentan Placebo
Arm/Group Description Bosentan bosentan: bosentan/62.5 mg tablet/b.i.d. for 4 weeks then bosentan/125 mg tablet/b.i.d. Placebo placebo: Matching bosentan placebo/b.i.d.
All Cause Mortality
Bosentan Placebo
Affected / at Risk (%) # Events Affected / at Risk (%) # Events
Total / (NaN) / (NaN)
Serious Adverse Events
Bosentan Placebo
Affected / at Risk (%) # Events Affected / at Risk (%) # Events
Total 73/159 (45.9%) 102/174 (58.6%)
Blood and lymphatic system disorders
ANAEMIA 3/159 (1.9%) 2/174 (1.1%)
ANAEMIA HAEMOLYTIC AUTOIMMUNE 1/159 (0.6%) 0/174 (0%)
SPLENOMEGALY 1/159 (0.6%) 0/174 (0%)
HYPERSPLENISM 0/159 (0%) 1/174 (0.6%)
THROMBOCYTOPENIA 0/159 (0%) 1/174 (0.6%)
THROMBOTIC THROMBOCYTOPENIC PURPURA 0/159 (0%) 1/174 (0.6%)
Cardiac disorders
RIGHT VENTRICULAR FAILURE 6/159 (3.8%) 8/174 (4.6%)
ATRIAL FIBRILLATION 4/159 (2.5%) 3/174 (1.7%)
ATRIAL FLUTTER 2/159 (1.3%) 1/174 (0.6%)
CARDIAC FAILURE CONGESTIVE 2/159 (1.3%) 1/174 (0.6%)
BRADYCARDIA 2/159 (1.3%) 0/174 (0%)
MYOCARDIAL INFARCTION 1/159 (0.6%) 2/174 (1.1%)
COR PULMONALE 1/159 (0.6%) 1/174 (0.6%)
CORONARY ARTERY DISEASE 1/159 (0.6%) 1/174 (0.6%)
SUPRAVENTRICULAR TACHYCARDIA 1/159 (0.6%) 1/174 (0.6%)
ACUTE MYOCARDIAL INFARCTION 1/159 (0.6%) 0/174 (0%)
ACUTE RIGHT VENTRICULAR FAILURE 1/159 (0.6%) 0/174 (0%)
CARDIAC FAILURE 1/159 (0.6%) 0/174 (0%)
TRIFASCICULAR BLOCK 1/159 (0.6%) 0/174 (0%)
CARDIAC ARREST 0/159 (0%) 3/174 (1.7%)
ACUTE CORONARY SYNDROME 0/159 (0%) 1/174 (0.6%)
ANGINA PECTORIS 0/159 (0%) 1/174 (0.6%)
BRADYARRHYTHMIA 0/159 (0%) 1/174 (0.6%)
INTRACARDIAC THROMBUS 0/159 (0%) 1/174 (0.6%)
SICK SINUS SYNDROME 0/159 (0%) 1/174 (0.6%)
Ear and labyrinth disorders
SUDDEN HEARING LOSS 0/159 (0%) 1/174 (0.6%)
Eye disorders
RETINAL DETACHMENT 1/159 (0.6%) 0/174 (0%)
EYE SWELLING 0/159 (0%) 1/174 (0.6%)
Gastrointestinal disorders
GASTROINTESTINAL HAEMORRHAGE 2/159 (1.3%) 1/174 (0.6%)
SMALL INTESTINAL OBSTRUCTION 2/159 (1.3%) 0/174 (0%)
ABDOMINAL PAIN UPPER 1/159 (0.6%) 1/174 (0.6%)
UPPER GASTROINTESTINAL HAEMORRHAGE 1/159 (0.6%) 1/174 (0.6%)
ASCITES 1/159 (0.6%) 0/174 (0%)
DYSPHAGIA 1/159 (0.6%) 0/174 (0%)
GASTROINTESTINAL DISORDER 1/159 (0.6%) 0/174 (0%)
GASTROOESOPHAGEAL REFLUX DISEASE 1/159 (0.6%) 0/174 (0%)
HAEMATOCHEZIA 1/159 (0.6%) 0/174 (0%)
PANCREATITIS 1/159 (0.6%) 0/174 (0%)
RECTAL HAEMORRHAGE 1/159 (0.6%) 0/174 (0%)
ABDOMINAL PAIN 0/159 (0%) 3/174 (1.7%)
CONSTIPATION 0/159 (0%) 1/174 (0.6%)
DIVERTICULUM 0/159 (0%) 1/174 (0.6%)
GASTRITIS 0/159 (0%) 1/174 (0.6%)
HAEMATEMESIS 0/159 (0%) 1/174 (0.6%)
LARGE INTESTINE POLYP 0/159 (0%) 1/174 (0.6%)
OESOPHAGEAL VARICES HAEMORRHAGE 0/159 (0%) 1/174 (0.6%)
General disorders
CHEST PAIN 5/159 (3.1%) 7/174 (4%)
GENERAL PHYSICAL HEALTH DETERIORATION 1/159 (0.6%) 1/174 (0.6%)
SUDDEN DEATH 1/159 (0.6%) 1/174 (0.6%)
GENERALISED OEDEMA 0/159 (0%) 3/174 (1.7%)
OEDEMA PERIPHERAL 0/159 (0%) 2/174 (1.1%)
ADVERSE DRUG REACTION 0/159 (0%) 1/174 (0.6%)
ASTHENIA 0/159 (0%) 1/174 (0.6%)
DEATH 0/159 (0%) 1/174 (0.6%)
FATIGUE 0/159 (0%) 1/174 (0.6%)
MULTI-ORGAN FAILURE 0/159 (0%) 1/174 (0.6%)
Hepatobiliary disorders
HEPATIC CIRRHOSIS 1/159 (0.6%) 1/174 (0.6%)
BILIARY DYSKINESIA 0/159 (0%) 1/174 (0.6%)
CHOLECYSTITIS 0/159 (0%) 1/174 (0.6%)
CHOLECYSTITIS ACUTE 0/159 (0%) 1/174 (0.6%)
CHOLESTASIS 0/159 (0%) 1/174 (0.6%)
PORTAL HYPERTENSION 0/159 (0%) 1/174 (0.6%)
Immune system disorders
DRUG HYPERSENSITIVITY 1/159 (0.6%) 1/174 (0.6%)
HYPERSENSITIVITY 0/159 (0%) 1/174 (0.6%)
Infections and infestations
PNEUMONIA 11/159 (6.9%) 6/174 (3.4%)
BRONCHITIS 6/159 (3.8%) 3/174 (1.7%)
GASTROENTERITIS 3/159 (1.9%) 5/174 (2.9%)
CELLULITIS 3/159 (1.9%) 0/174 (0%)
CLOSTRIDIUM DIFFICILE COLITIS 2/159 (1.3%) 0/174 (0%)
DIVERTICULITIS 2/159 (1.3%) 0/174 (0%)
SEPTIC SHOCK 1/159 (0.6%) 2/174 (1.1%)
URINARY TRACT INFECTION 1/159 (0.6%) 2/174 (1.1%)
BRONCHOPNEUMONIA 1/159 (0.6%) 1/174 (0.6%)
PYELONEPHRITIS 1/159 (0.6%) 1/174 (0.6%)
SEPSIS 1/159 (0.6%) 1/174 (0.6%)
UPPER RESPIRATORY TRACT INFECTION 1/159 (0.6%) 1/174 (0.6%)
ABDOMINAL ABSCESS 1/159 (0.6%) 0/174 (0%)
APPENDICITIS 1/159 (0.6%) 0/174 (0%)
CLOSTRIDIUM DIFFICILE INFECTION 1/159 (0.6%) 0/174 (0%)
DENGUE FEVER 1/159 (0.6%) 0/174 (0%)
DEVICE RELATED SEPSIS 1/159 (0.6%) 0/174 (0%)
GASTROENTERITIS SALMONELLA 1/159 (0.6%) 0/174 (0%)
HAEMATOMA INFECTION 1/159 (0.6%) 0/174 (0%)
LOWER RESPIRATORY TRACT INFECTION 1/159 (0.6%) 0/174 (0%)
LUNG INFECTION 1/159 (0.6%) 0/174 (0%)
PNEUMOCOCCAL SEPSIS 1/159 (0.6%) 0/174 (0%)
PNEUMONIA STAPHYLOCOCCAL 1/159 (0.6%) 0/174 (0%)
POSTOPERATIVE WOUND INFECTION 1/159 (0.6%) 0/174 (0%)
VIRAL UPPER RESPIRATORY TRACT INFECTION 0/159 (0%) 2/174 (1.1%)
BACTERAEMIA 0/159 (0%) 1/174 (0.6%)
BRONCHITIS VIRAL 0/159 (0%) 1/174 (0.6%)
ERYSIPELAS 0/159 (0%) 1/174 (0.6%)
GASTROENTERITIS CALICIVIRAL 0/159 (0%) 1/174 (0.6%)
H1N1 INFLUENZA 0/159 (0%) 1/174 (0.6%)
INFECTED DERMAL CYST 0/159 (0%) 1/174 (0.6%)
INFECTIVE EXACERBATION OF CHRONIC OBSTRUCTIVE AIRWAYS DISEASE 0/159 (0%) 1/174 (0.6%)
KLEBSIELLA BACTERAEMIA 0/159 (0%) 1/174 (0.6%)
RESPIRATORY TRACT INFECTION 0/159 (0%) 1/174 (0.6%)
SEPSIS SYNDROME 0/159 (0%) 1/174 (0.6%)
SINUSITIS 0/159 (0%) 1/174 (0.6%)
TUBERCULOSIS 0/159 (0%) 1/174 (0.6%)
UROSEPSIS 0/159 (0%) 1/174 (0.6%)
WOUND INFECTION 0/159 (0%) 1/174 (0.6%)
Injury, poisoning and procedural complications
HUMERUS FRACTURE 2/159 (1.3%) 0/174 (0%)
FALL 1/159 (0.6%) 2/174 (1.1%)
HIP FRACTURE 1/159 (0.6%) 2/174 (1.1%)
LACERATION 1/159 (0.6%) 1/174 (0.6%)
RIB FRACTURE 1/159 (0.6%) 1/174 (0.6%)
FOOT FRACTURE 1/159 (0.6%) 0/174 (0%)
POST PROCEDURAL COMPLICATION 1/159 (0.6%) 0/174 (0%)
RENAL HAEMATOMA 1/159 (0.6%) 0/174 (0%)
TRANSFUSION-RELATED ACUTE LUNG INJURY 1/159 (0.6%) 0/174 (0%)
FEMORAL NECK FRACTURE 0/159 (0%) 1/174 (0.6%)
FRACTURED SACRUM 0/159 (0%) 1/174 (0.6%)
INCISIONAL HERNIA 0/159 (0%) 1/174 (0.6%)
LOWER LIMB FRACTURE 0/159 (0%) 1/174 (0.6%)
PELVIC FRACTURE 0/159 (0%) 1/174 (0.6%)
SUBDURAL HAEMATOMA 0/159 (0%) 1/174 (0.6%)
TOXICITY TO VARIOUS AGENTS 0/159 (0%) 1/174 (0.6%)
Investigations
LIVER FUNCTION TEST ABNORMAL 2/159 (1.3%) 0/174 (0%)
ALANINE AMINOTRANSFERASE INCREASED 1/159 (0.6%) 1/174 (0.6%)
ASPARTATE AMINOTRANSFERASE INCREASED 1/159 (0.6%) 1/174 (0.6%)
ELECTROCARDIOGRAM QT PROLONGED 1/159 (0.6%) 0/174 (0%)
HEPATIC ENZYME INCREASED 1/159 (0.6%) 0/174 (0%)
VASCULAR RESISTANCE PULMONARY INCREASED 1/159 (0.6%) 0/174 (0%)
BLOOD BILIRUBIN INCREASED 0/159 (0%) 1/174 (0.6%)
WEIGHT DECREASED 0/159 (0%) 1/174 (0.6%)
Metabolism and nutrition disorders
DEHYDRATION 3/159 (1.9%) 0/174 (0%)
FLUID OVERLOAD 3/159 (1.9%) 0/174 (0%)
HYPERKALAEMIA 2/159 (1.3%) 0/174 (0%)
FLUID RETENTION 1/159 (0.6%) 1/174 (0.6%)
HYPERVOLAEMIA 1/159 (0.6%) 0/174 (0%)
HYPOKALAEMIA 1/159 (0.6%) 0/174 (0%)
DECREASED APPETITE 0/159 (0%) 1/174 (0.6%)
GOUT 0/159 (0%) 1/174 (0.6%)
Musculoskeletal and connective tissue disorders
INTERVERTEBRAL DISC PROTRUSION 1/159 (0.6%) 0/174 (0%)
PAIN IN EXTREMITY 0/159 (0%) 2/174 (1.1%)
ARTHRALGIA 0/159 (0%) 1/174 (0.6%)
BACK PAIN 0/159 (0%) 1/174 (0.6%)
COLLAGEN DISORDER 0/159 (0%) 1/174 (0.6%)
CREST SYNDROME 0/159 (0%) 1/174 (0.6%)
DUPUYTREN'S CONTRACTURE 0/159 (0%) 1/174 (0.6%)
HAEMARTHROSIS 0/159 (0%) 1/174 (0.6%)
MUSCULOSKELETAL CHEST PAIN 0/159 (0%) 1/174 (0.6%)
OSTEONECROSIS 0/159 (0%) 1/174 (0.6%)
ROTATOR CUFF SYNDROME 0/159 (0%) 1/174 (0.6%)
SYSTEMIC LUPUS ERYTHEMATOSUS 0/159 (0%) 1/174 (0.6%)
Neoplasms benign, malignant and unspecified (incl cysts and polyps)
BRONCHIOLOALVEOLAR CARCINOMA 1/159 (0.6%) 0/174 (0%)
DIFFUSE LARGE B-CELL LYMPHOMA 1/159 (0.6%) 0/174 (0%)
UTERINE LEIOMYOMA 1/159 (0.6%) 0/174 (0%)
ACOUSTIC NEUROMA 0/159 (0%) 1/174 (0.6%)
BRONCHIAL CARCINOMA 0/159 (0%) 1/174 (0.6%)
CERVIX CARCINOMA 0/159 (0%) 1/174 (0.6%)
INFLAMMATORY CARCINOMA OF THE BREAST 0/159 (0%) 1/174 (0.6%)
MALIGNANT MELANOMA IN SITU 0/159 (0%) 1/174 (0.6%)
MENINGIOMA BENIGN 0/159 (0%) 1/174 (0.6%)
METASTATIC MALIGNANT MELANOMA 0/159 (0%) 1/174 (0.6%)
RECTAL CANCER 0/159 (0%) 1/174 (0.6%)
Nervous system disorders
SYNCOPE 3/159 (1.9%) 6/174 (3.4%)
TRANSIENT ISCHAEMIC ATTACK 1/159 (0.6%) 3/174 (1.7%)
NEUROPATHY PERIPHERAL 1/159 (0.6%) 0/174 (0%)
SCIATICA 1/159 (0.6%) 0/174 (0%)
CEREBROVASCULAR ACCIDENT 0/159 (0%) 2/174 (1.1%)
CONVULSION 0/159 (0%) 2/174 (1.1%)
HYPOAESTHESIA 0/159 (0%) 2/174 (1.1%)
BRAIN STEM STROKE 0/159 (0%) 1/174 (0.6%)
DIZZINESS 0/159 (0%) 1/174 (0.6%)
HEADACHE 0/159 (0%) 1/174 (0.6%)
HEMIPARESIS 0/159 (0%) 1/174 (0.6%)
LUMBAR RADICULOPATHY 0/159 (0%) 1/174 (0.6%)
MYASTHENIA GRAVIS 0/159 (0%) 1/174 (0.6%)
PRESYNCOPE 0/159 (0%) 1/174 (0.6%)
Pregnancy, puerperium and perinatal conditions
PREGNANCY 0/159 (0%) 3/174 (1.7%)
Psychiatric disorders
BIPOLAR I DISORDER 1/159 (0.6%) 0/174 (0%)
DEPRESSION 1/159 (0.6%) 0/174 (0%)
MENTAL STATUS CHANGES 1/159 (0.6%) 0/174 (0%)
SUICIDE ATTEMPT 1/159 (0.6%) 0/174 (0%)
SUICIDAL IDEATION 0/159 (0%) 1/174 (0.6%)
Renal and urinary disorders
RENAL FAILURE ACUTE 1/159 (0.6%) 4/174 (2.3%)
BLADDER NECK OBSTRUCTION 0/159 (0%) 1/174 (0.6%)
HAEMATURIA 0/159 (0%) 1/174 (0.6%)
NEPHROLITHIASIS 0/159 (0%) 1/174 (0.6%)
RENAL FAILURE 0/159 (0%) 1/174 (0.6%)
RENAL IMPAIRMENT 0/159 (0%) 1/174 (0.6%)
RENAL TUBULAR NECROSIS 0/159 (0%) 1/174 (0.6%)
Reproductive system and breast disorders
MENORRHAGIA 1/159 (0.6%) 0/174 (0%)
UTERINE HAEMORRHAGE 1/159 (0.6%) 0/174 (0%)
DYSMENORRHOEA 0/159 (0%) 1/174 (0.6%)
OVARIAN MASS 0/159 (0%) 1/174 (0.6%)
UTERINE PROLAPSE 0/159 (0%) 1/174 (0.6%)
VAGINAL HAEMORRHAGE 0/159 (0%) 1/174 (0.6%)
Respiratory, thoracic and mediastinal disorders
PULMONARY ARTERIAL HYPERTENSION 25/159 (15.7%) 28/174 (16.1%)
RESPIRATORY FAILURE 6/159 (3.8%) 3/174 (1.7%)
DYSPNOEA 5/159 (3.1%) 8/174 (4.6%)
CHRONIC OBSTRUCTIVE PULMONARY DISEASE 4/159 (2.5%) 2/174 (1.1%)
ACUTE RESPIRATORY FAILURE 4/159 (2.5%) 1/174 (0.6%)
PULMONARY EMBOLISM 3/159 (1.9%) 1/174 (0.6%)
HYPOXIA 3/159 (1.9%) 0/174 (0%)
PULMONARY OEDEMA 2/159 (1.3%) 1/174 (0.6%)
CHRONIC RESPIRATORY FAILURE 2/159 (1.3%) 0/174 (0%)
HAEMOPTYSIS 2/159 (1.3%) 0/174 (0%)
PNEUMOTHORAX 2/159 (1.3%) 0/174 (0%)
EPISTAXIS 1/159 (0.6%) 2/174 (1.1%)
ASTHMA 1/159 (0.6%) 1/174 (0.6%)
PLEURISY 1/159 (0.6%) 1/174 (0.6%)
ACUTE PULMONARY OEDEMA 1/159 (0.6%) 0/174 (0%)
BRONCHIAL HYPERREACTIVITY 1/159 (0.6%) 0/174 (0%)
OBLITERATIVE BRONCHIOLITIS 1/159 (0.6%) 0/174 (0%)
ATELECTASIS 0/159 (0%) 1/174 (0.6%)
BRONCHIAL HAEMORRHAGE 0/159 (0%) 1/174 (0.6%)
ORTHOPNOEA 0/159 (0%) 1/174 (0.6%)
RESPIRATORY DISTRESS 0/159 (0%) 1/174 (0.6%)
Skin and subcutaneous tissue disorders
SKIN ULCER 1/159 (0.6%) 1/174 (0.6%)
URTICARIA 0/159 (0%) 1/174 (0.6%)
Surgical and medical procedures
CORONARY ARTERY BYPASS 1/159 (0.6%) 0/174 (0%)
DIURETIC THERAPY 1/159 (0.6%) 0/174 (0%)
FINGER AMPUTATION 1/159 (0.6%) 0/174 (0%)
INCISIONAL HERNIA REPAIR 1/159 (0.6%) 0/174 (0%)
KNEE ARTHROPLASTY 0/159 (0%) 2/174 (1.1%)
CHEMOTHERAPY 0/159 (0%) 1/174 (0.6%)
RADIOTHERAPY 0/159 (0%) 1/174 (0.6%)
SKIN CYST EXCISION 0/159 (0%) 1/174 (0.6%)
SKIN NEOPLASM EXCISION 0/159 (0%) 1/174 (0.6%)
THYMECTOMY 0/159 (0%) 1/174 (0.6%)
Vascular disorders
HYPERTENSION 1/159 (0.6%) 2/174 (1.1%)
EXTREMITY NECROSIS 1/159 (0.6%) 0/174 (0%)
DEEP VEIN THROMBOSIS 0/159 (0%) 1/174 (0.6%)
FEMORAL ARTERY OCCLUSION 0/159 (0%) 1/174 (0.6%)
HAEMATOMA 0/159 (0%) 1/174 (0.6%)
HYPOTENSION 0/159 (0%) 1/174 (0.6%)
PERIPHERAL ARTERIAL OCCLUSIVE DISEASE 0/159 (0%) 1/174 (0.6%)
SHOCK HAEMORRHAGIC 0/159 (0%) 1/174 (0.6%)
Other (Not Including Serious) Adverse Events
Bosentan Placebo
Affected / at Risk (%) # Events Affected / at Risk (%) # Events
Total 135/159 (84.9%) 147/174 (84.5%)
Blood and lymphatic system disorders
ANAEMIA 15/159 (9.4%) 10/174 (5.7%)
Gastrointestinal disorders
DIARRHOEA 19/159 (11.9%) 19/174 (10.9%)
NAUSEA 16/159 (10.1%) 22/174 (12.6%)
ABDOMINAL PAIN 11/159 (6.9%) 12/174 (6.9%)
VOMITING 8/159 (5%) 12/174 (6.9%)
General disorders
OEDEMA PERIPHERAL 30/159 (18.9%) 26/174 (14.9%)
CHEST PAIN 18/159 (11.3%) 10/174 (5.7%)
FATIGUE 13/159 (8.2%) 19/174 (10.9%)
Infections and infestations
UPPER RESPIRATORY TRACT INFECTION 21/159 (13.2%) 29/174 (16.7%)
URINARY TRACT INFECTION 16/159 (10.1%) 13/174 (7.5%)
BRONCHITIS 14/159 (8.8%) 18/174 (10.3%)
NASOPHARYNGITIS 11/159 (6.9%) 15/174 (8.6%)
SINUSITIS 11/159 (6.9%) 12/174 (6.9%)
PNEUMONIA 8/159 (5%) 8/174 (4.6%)
Injury, poisoning and procedural complications
FALL 8/159 (5%) 6/174 (3.4%)
Investigations
ALANINE AMINOTRANSFERASE INCREASED 16/159 (10.1%) 7/174 (4%)
ASPARTATE AMINOTRANSFERASE INCREASED 13/159 (8.2%) 8/174 (4.6%)
LIVER FUNCTION TEST ABNORMAL 11/159 (6.9%) 4/174 (2.3%)
HEPATIC ENZYME INCREASED 9/159 (5.7%) 3/174 (1.7%)
Musculoskeletal and connective tissue disorders
BACK PAIN 15/159 (9.4%) 22/174 (12.6%)
ARTHRALGIA 13/159 (8.2%) 20/174 (11.5%)
PAIN IN EXTREMITY 9/159 (5.7%) 15/174 (8.6%)
MUSCLE SPASMS 8/159 (5%) 6/174 (3.4%)
Nervous system disorders
HEADACHE 24/159 (15.1%) 24/174 (13.8%)
DIZZINESS 17/159 (10.7%) 17/174 (9.8%)
Psychiatric disorders
ANXIETY 9/159 (5.7%) 11/174 (6.3%)
INSOMNIA 8/159 (5%) 11/174 (6.3%)
Respiratory, thoracic and mediastinal disorders
COUGH 22/159 (13.8%) 21/174 (12.1%)
DYSPNOEA 21/159 (13.2%) 19/174 (10.9%)
PULMONARY ARTERIAL HYPERTENSION 15/159 (9.4%) 35/174 (20.1%)
EPISTAXIS 12/159 (7.5%) 6/174 (3.4%)
NASAL CONGESTION 8/159 (5%) 0/174 (0%)
Skin and subcutaneous tissue disorders
RASH 10/159 (6.3%) 6/174 (3.4%)

Limitations/Caveats

[Not Specified]

More Information

Certain Agreements

Principal Investigators are NOT employed by the organization sponsoring the study.

The only disclosure restriction on the PI is that the sponsor can review results communications prior to public release and can embargo communications regarding trial results for a period that is less than or equal to 60 days. The sponsor cannot require changes to the communication and cannot extend the embargo.

Results Point of Contact

Name/Title Jonathan Tolson
Organization Actelion Pharmaceuticals Ltd
Phone +41 61 565 56 04
Email jonathon.tolson@actelion.com
Responsible Party:
Actelion
ClinicalTrials.gov Identifier:
NCT00303459
Other Study ID Numbers:
  • AC-052-414
  • COMPASS-2
First Posted:
Mar 17, 2006
Last Update Posted:
Nov 11, 2015
Last Verified:
Oct 1, 2015