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Right Ventricular Resynchronization Therapy

2014-08-27 03:12:11 | BioPortfolio

Summary

The purpose of this study is to determine whether cardiac resynchronization therapy with the use of an implanted electronic pacemaker reduces morbidity associated with chronic thromboembolic pulmonary hypertension

Description

Rationale: The clinical severity of right ventricular disease is largely determined by right-to-left ventricular dyssynchrony, i.e., delay of electrical activity between the right and left ventricles. Moreover, in patients with chronic thromboembolic pulmonary hypertension (CTEPH), we found that acute correction of this dyssynchrony by temporary pacing (prior to pulmonary endarterectomy, presently the therapy of choice for CTEPH) results in significant improvement in cardiac output. In this study, we aim to establish whether chronic pacing with the use of implanted pacemakers confers long-lasting improvements in cardiac output and functional class.

Objective: To study whether chronic pacing with implanted pacemakers confers long-lasting improvements in cardiac output and functional class in severely symptomatic CTEPH patients who are not eligible for pulmonary endarterectomy, or those in whom pulmonary endarterectomy has failed.

Study design: Chronic intervention study, double-blinded, randomized, cross-over.

Study population: Adult CTEPH patients who are not eligible for pulmonary endarterectomy, or those in whom pulmonary endarterectomy has failed.

Intervention (if applicable): chronic right ventricular resynchronization therapy (RVRT), i.e., chronic right atrial, right ventricular, and left ventricular pacing with the use of implanted pacemakers.

Main study parameters/endpoints: (Duration of) improvements (in l/min) in cardiac output as measured using Doppler echocardiography, and functional class as measured using 6-minute walking distance (6-MWD), right and left ventricular dimensions and ejection fractions (99mTechnetium scintigraphy), biomarkers for heart failure (serum NT-proBNP levels), and quality of life (SF-36) questionnaire.

Design: Randomized, double-blind, cross-over study with 2 arms of 10 patients each (arms 1 and 2). In arm 1, RVRT is switched on immediately after pacemaker implant, is switched of in week 5, and switched on at the start of week 6 until study end (32 weeks). In arm 2, RVRT is switched at the start of week 5 after pacemaker implant until study end (32 weeks). At various follow-up visits at weeks 1, 4, 5, 6, 8, 12, 16, the main study parameters/endpoints (see previous paragraph) will be assessed.

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Outcomes Assessor), Primary Purpose: Treatment

Conditions

Right Ventricular Failure

Intervention

Implantation of 3-chamber pacemaker

Location

Academic Medical Center, University of Amsterdam
Amsterdam
Netherlands
1105 AZ

Status

Enrolling by invitation

Source

Academisch Medisch Centrum - Universiteit van Amsterdam (AMC-UvA)

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:12:11-0400

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Medical and Biotech [MESH] Definitions

A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.

Rare congenital cardiomyopathies characterized by the lack of left ventricular myocardium compaction. The noncompaction results in numerous prominent trabeculations and a loose myocardial meshwork (spongy myocardium) in the LEFT VENTRICLE. Heterogeneous clinical features include diminished systolic function sometimes associated with left ventricular dilation, that presents either neonatally or progressively. Often, the RIGHT VENTRICLE is also affected. CONGESTIVE HEART FAILURE; PULMONARY EMBOLISM; and ventricular ARRHYTHMIA are commonly seen.

A condition in which the RIGHT VENTRICLE of the heart was functionally impaired. This condition usually leads to HEART FAILURE or MYOCARDIAL INFARCTION, and other cardiovascular complications. Diagnosis is made by measuring the diminished ejection fraction and a depressed level of motility of the right ventricular wall.

A form of CARDIAC MUSCLE disease that is characterized by ventricular dilation, VENTRICULAR DYSFUNCTION, and HEART FAILURE. Risk factors include SMOKING; ALCOHOL DRINKING; HYPERTENSION; INFECTION; PREGNANCY; and mutations in the LMNA gene encoding LAMIN TYPE A, a NUCLEAR LAMINA protein.

A condition in which the LEFT VENTRICLE of the heart was functionally impaired. This condition usually leads to HEART FAILURE; MYOCARDIAL INFARCTION; and other cardiovascular complications. Diagnosis is made by measuring the diminished ejection fraction and a depressed level of motility of the left ventricular wall.

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