Phosphodiesterase-5 (PDE5) Inhibition and Pulmonary Hypertension in Diastolic Heart Failure

Sponsor

University of Milan (Other)

Overall Status

Completed

CT.gov ID

NCT01156636

Collaborator

(none)

Enrollment

Arms

Duration (Months)

Study Details

Study Description

Brief Summary

Prevalence of heart failure (HF) with left ventricular (LV) diastolic dysfunction and preserved ejection fraction (EF) (HFpEF) is increasing. Prognosis worsens with development of pulmonary vasoconstriction and hypertension (PH) and right ventricular (RV) failure. The investigators aimed at modulating pulmonary vascular tone and RV burden in HFpEF due to high blood pressure (HBP), by using the phosphodiesterase-5 (PDE5) inhibitor sildenafil.

Condition or Disease	Intervention/Treatment	Phase
Pulmonary Hypertension Diastolic Heart Failure	Drug: Sildenafil Drug: Placebo	Phase 2/Phase 3

Detailed Description

Heart failure (HF) with preserved left ventricular (LV) ejection fraction (EF) (HFpEF) is a public health problem and a major topic in clinical cardiology. Its prevalence, in fact, is increasing and the outcome seems to be similar to that of HF with LV systolic dysfunction (LVSD). Pulmonary hypertension (PH) in HFpEF is highly prevalent and often severe and, like in LVSD (3), is a predictor of morbidity and mortality (4). Because of the thin wall and the distensibility, the right ventricle (RV) is much more vulnerable by an excessive afterload than by preload. The pulmonary circulation is a central determinant of RV afterload, and an increase in impendance to RV ejection, like occurring in LV dysfunction, can easily result in RV failure, tricuspid regurgitation, central venous pressure (CVP) rise. Development of RV failure is unanimously viewed as a predictor of poor prognosis but the underlying mechanisms have not been extensively investigated.

Because of the prevalence and clinical significance of PH secondary to HF, attenuation of the pulmonary vascular tone and of the RV hemodynamic burden has been suggested as a goal to be achieved with HF therapy. Attempts with endothelin receptor antagonists, or prostacyclin analogues, were basically unsuccessful. Experimental models and human studies, showing that in HF nitric oxide (NO) - dependent pulmonary vasodilatation is impaired and pulmonary vascular resistance elevation is at least in part due to pulmonary endothelial dysfunction, have suggested therapeutic strategies with agents that increase NO activity, like nitrates or phosphodiesterase - 5 (PDE5) inhibitors (12-14). The latter agents offer the double advantage of selectively dilating the pulmonary vessels and not producing tachyphylaxis.

In this 1-year duration study, the primary end-point was to probe whether pulmonary hemodynamics and RV performance in HFpEF with PH may be targets of PDE5 inhibition with sildenafil.

Study Design

Study Type:

Interventional

Actual Enrollment :

44 participants

Allocation:

Randomized

Intervention Model:

Parallel Assignment

Masking:

Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)

Primary Purpose:

Treatment

Official Title:

Pulmonary Hypertension Secondary to Heart Failure With Preserved Systolic Function: a Target of Phosphodiesterase - 5 Inhibition in a 1- Year Duration Study

Study Start Date :

Jan 1, 2006

Actual Primary Completion Date :

Sep 1, 2009

Actual Study Completion Date :

Dec 1, 2009

Arms and Interventions

Arm	Intervention/Treatment
Active Comparator: Sildenafil	Drug: Sildenafil 50 mg 3 times/day for 1 year
Placebo Comparator: Placebo	Drug: Placebo

Arm

Intervention/Treatment

Active Comparator: Sildenafil

Drug: Sildenafil

50 mg 3 times/day for 1 year

Placebo Comparator: Placebo

Drug: Placebo

Outcome Measures

Primary Outcome Measures

Pulmonary hemodynamics [1 year]

Eligibility Criteria

Criteria

Ages Eligible for Study:

N/A and Older

Sexes Eligible for Study:

Male

Accepts Healthy Volunteers:

Inclusion Criteria:

LVEF >50%
sinus rhythm and stable clinical condition defined as no changes in therapeutic regimen, or hospitalization in the 6 months preceding recruitment.
pulmonary artery systolic pressure > 40 mm Hg,