DOT HeartMate 3 Study

Sponsor
Institute for Clinical and Experimental Medicine (Other)
Overall Status
Recruiting
CT.gov ID
NCT04974684
Collaborator
(none)
45
1
2
13.9
3.2

Study Details

Study Description

Brief Summary

A prospective, single-center, randomized controlled trial of the feasibility and safety of apixaban in HeartMate 3 patients.

Condition or Disease Intervention/Treatment Phase
N/A

Detailed Description

HeartMate 3 (HM3) Left Ventricular Assist System (LVAS) is a centrifugal, fully magnetically levitated, continuous-flow pump designed to facilitate hemocompatibility by reducing shear stress on blood elements and to optimize pump washout by intrinsic pulsatility.

The Multicenter Study of MagLev Technology in Patients Undergoing Mechanical Circulatory Support Therapy with HeartMate 3 (MOMENTUM 3) trial 2-year data demonstrated an absence of confirmed pump thrombosis requiring pump exchange and marked reduction in stroke rates. On the backdrop of conventional anticoagulation protocols used in the study, observed bleeding complication rates in HM 3 were reduced, yet there is a need for further improvement as the overall intensity of conventional anti-thrombotic therapy represents a major contributor to non-surgical bleeding-related outcomes.

The HM3 LVAS Instructions for Use (IFU) recommend maintaining patients on Warfarin and Aspirin for long-term anticoagulation therapy. Recent results of The Minimal AnticoaGulation EvaluatioN To aUgment heMocompatibility (MAGENTUM 1) pilot study has demonstrated substantially lower-intensity anticoagulation (INR range 1.5 - 1.9) is achievable and supports the safety of lower targets with select patients implanted with the HeartMate 3 beyond 1 year with no thromboembolic complications or pump thrombosis. The observed outcomes were similar to those with the higher intensity anticoagulation targets and further support a signal of enhanced intrinsic thromboresistance of the HM3.

Direct oral anticoagulants (DOACs) are a class of drugs which directly exert therapeutic effect on specific coagulation factors. Broadly, they can be categorized as direct thrombin inhibitors (dabigatran) and factor Xa inhibitors (apixaban, rivaroxaban, and edoxaban) or FXai. Warfarin, which inhibits vitamin K dependent synthesis of coagulation factors in a manner that prevents activation of these factors, has wide inter-individual variation in metabolism and a narrow therapeutic window, as well as both food-drug and drug-drug interactions; the result is that patients taking warfarin require frequent monitoring of the anticoagulant effect to maintain safety and efficacy. The DOAC directly enter the blood to bind to the activated coagulation factor target; they have predictable pharmacokinetics, little interindividual variation in metabolism, few drug-drug interactions, and no interactions with foods. The large phase 3 RCT in both AF and VTE established both efficacy and safety-without the need for monitoring. The FXai may provide better anticoagulation than the oral direct thrombin inhibitor due to their action earlier in the coagulation cascade prior to the generation of thrombin which may ameliorate the likelihood of initiation of the feedback loop resulting in >1000-fold increase in thrombin production. Of the studied FXai , apixaban has the lowest major bleeding complication rate and has not been shown to increase GI-bleeding. It also has the least dependence on renal clearance.

Consequently, with the documented enhanced hemocompatibility of the HeartMate 3 and the potential for reduced major bleeding with apixaban in indicated patient populations, the investigators provide the rationale that patients with the HM3 are in clinical equipoise to be randomized in a feasibility study of a new antithrombotic strategy testing apixaban with or without aspirin compared to the current standard of care warfarin and aspirin in a rigorously structured study to evaluate safety in stable patients with the HM3 device.

Apixaban Safety and Efficacy Data Apixaban is a DOAC that directly inhibits Factor Xa (FXai) in the coagulation cascade. Its therapeutic effect is more consistent and predictable due to its mechanism of action, and it is not subject to the disadvantages inherent to Vitamin K antagonist (VKA) anticoagulants.

The rationale for Apixaban use with the HeartMate 3 There have been no studies to date that have systematically evaluated the feasibility of using apixaban alone or combined with low dose aspirin in HM3 patients. All the primary phase 3 clinical trials assessing DOACs have focused on patients with non-valvular atrial fibrillation or venous thromboembolism with or without cancer. Within the literature, there are sparse reports of apixaban use with LVAD patients due to recurrent bleeding or non-compliance with warfarin. These small sample size studies reported encouraging low rates of thromboembolic events. In all but one instance, aspirin was withheld due to the history of bleeding events. Patients in these studies either had the HeartMate II or HeartWare HVAD.

Reduction in bleeding and thromboembolic events with HeartMate 3 compared to the HeartMate II was demonstrated by the MOMENTUM 3 IDE Trial. Yet, bleeding complications remain a burdensome limitation while on support and represent a significant cause of rehospitalizations and morbidity. Independently, both a reduction in major bleeding events and stable anticoagulation intensity constitute a compelling potential benefit of a modified antithrombotic strategy with a direct oral anticoagulant. However, these apixaban associated benefits remain to be validated in advanced heart failure population supported with the HeartMate 3 LVAS. Therefore, the objective of this study is to assess safety and feasibility of apixaban use in HM3 supported patients.

DATA COLLECTION & FOLLOW-UP ASSESSMENTS The patient will be assessed at baseline. Lactate dehydrogenase (LDH) will be assessed once a week for 4 weeks, then once every 2 weeks for the next month and monthly thereafter; TTE ECHO follow-up will be performed at baseline, at 1 month and at 3 months, followed until study completion per site standard of care.

Study Design

Study Type:
Interventional
Anticipated Enrollment :
45 participants
Allocation:
Randomized
Intervention Model:
Parallel Assignment
Masking:
None (Open Label)
Primary Purpose:
Other
Official Title:
Direct Oral Anticoagulant Therapy With the HeartMate 3 LVAD: A Pilot Study
Actual Study Start Date :
Feb 1, 2022
Anticipated Primary Completion Date :
Jan 1, 2023
Anticipated Study Completion Date :
Apr 1, 2023

Arms and Interventions

Arm Intervention/Treatment
Experimental: Interventional group

Device: HeartMate 3
Patients implanted with HeartMate 3 will be randomized in 2:1 ratio in interventional and control group. Patients in interventional group will be switched to therapy with apixaban instead of warfarin.

Drug: Apixaban
Patients implanted with HeartMate 3 will be randomized in 2:1 ratio in interventional and control group. Patients in interventional group will be switched to therapy with apixaban instead of warfarin.

No Intervention: Control group

Outcome Measures

Primary Outcome Measures

  1. Evaluation of hemocompatibility related adverse events during apixaban use with the HeartMate 3 LVAS [3 months]

    Evaluation survival free of major hemocompatibility related adverse events (HRAEs). Comparison of HRAEs in apixaban and control group per protocol. Separate analysis in patients randomized to receive aspirin and no-aspirin within the apixaban group as specified in protocol.

Secondary Outcome Measures

  1. Evaluation of adverse events defined by INTERMACS definitions [Through study completion, an average of 1 year.]

    The events evaluated are as follows: Stroke (ischemic/hemorrhagic) Pump thrombosis Major bleeding GI Bleeding Peripheral arterial thromboembolic events Transient ischemic attack Hemolysis Venous thromboembolism Myocardial infarction Right heart failure Cardiac arrhythmias Liver and kidney dysfunction Death due to any cause

Eligibility Criteria

Criteria

Ages Eligible for Study:
18 Years to 80 Years
Sexes Eligible for Study:
All
Accepts Healthy Volunteers:
No
Inclusion Criteria:
  • The patient has been implanted with HeartMate 3 LVAS

  • The patient is, at a minimum, 3 months post HeartMate 3 implant

  • The patient is stable, ambulatory, and has been discharged home

  • The patient provides written informed consent before any clinical investigation related procedure

Exclusion Criteria:
  • Non-compliance with anticoagulation and antiplatelet medication, in the opinion of the investigator

  • Weight ≤ 60 kgs. or age ≥ 80 years

  • Poor kidney function with serum creatinine ≥ 221umol/L or creatinine clearance < 0.042 mL/s, or the need for chronic renal replacement therapy

  • Total bilirubin > 43 umol/L, shock liver, or biopsy-proven liver cirrhosis

  • Absence of an informed consent

  • Presence of any mechanical prosthetic valve or any ancillary circulatory assist device system (other than the HM3)

  • Recent history of cardioembolic stroke

  • Hemodynamically significant carotid arteries stenosis (documented by imaging investigation not older than 12 months)

  • Need for antiplatelet therapy for reasons other than LVAD therapy

  • Major HRAE event after HeartMate 3 index hospitalization discharge

  • Known history of hyper- or hypo- coagulable disorder

  • Anti-phospholipid syndrome positive patients with documented history of thrombotic/thromboembolic events

  • Known hypersensitivity or allergy to apixaban or aspirin

  • The patient is involved in another interventional study or any study that could potentially affect the functioning of the HM3 LVAD or the therapeutic effect of any of the study anticoagulants (warfarin, apixaban or aspirin), or could potentially confound the study results

  • The patient is currently pregnant, breastfeeding, or intending to get pregnant during the study

  • Presence of other anatomic or comorbid conditions, or other medical, social, non-compliance or psychological conditions that, in the investigator's opinion, could limit the subject's ability to participate in the clinical investigation or to comply with follow-up requirements or impact the scientific soundness of the clinical investigation results.

Contacts and Locations

Locations

Site City State Country Postal Code
1 Institute for Clinical and Experimental Medicine Prague Czechia 14021

Sponsors and Collaborators

  • Institute for Clinical and Experimental Medicine

Investigators

None specified.

Study Documents (Full-Text)

More Information

Publications

None provided.
Responsible Party:
Prof. Ivan Netuka, MD, Ph.D., Chairman of the Cardiovascular Surgery Department, Institute for Clinical and Experimental Medicine
ClinicalTrials.gov Identifier:
NCT04974684
Other Study ID Numbers:
  • A-21-23
First Posted:
Jul 23, 2021
Last Update Posted:
Apr 8, 2022
Last Verified:
Apr 1, 2022
Studies a U.S. FDA-regulated Drug Product:
No
Studies a U.S. FDA-regulated Device Product:
Yes
Product Manufactured in and Exported from the U.S.:
Yes
Keywords provided by Prof. Ivan Netuka, MD, Ph.D., Chairman of the Cardiovascular Surgery Department, Institute for Clinical and Experimental Medicine
Additional relevant MeSH terms:

Study Results

No Results Posted as of Apr 8, 2022