CPET Predicts Long-term Survival and Positive Response to CRT

National Institute of Cardiology, Warsaw, Poland122 enrolled

Overview

The study tested the usefulness of cardiopulmonary exercise test (CPET) in selection of potential responders to CRT.

Cardiac resynchronization therapy (CRT) is an acknowledged therapy of selected patients with heart failure (HF). One of the unresolved problems is high percentage of non-responders to CRT, reaching 40%. No single parameter, helpful in identifying non-responders prior to CRT implantation, was found. The study included patients with HF of ischemic or non-ischemic etiology, in NYHA class II-IV, EF≤35% and QRS≥120ms. All the patients had CRT implanted. Clinical evaluation, CPET and NT-proBNP levels measurement were performed before CRT implantation and after 3-6 months. Improvement in HF symptoms of one or more NYHA class correlated with two-years survival. It was used as the criterion of positive response to CRT.

Study Type

OBSERVATIONAL

Enrollment

122

Conditions

Heart Failure With Reduced Ejection Fraction

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: * HF in class III or IV according to New York Heart Association (NYHA) in the course of ischemic (ICM) or non-ischemic cardiomyopathy (NICM), QRS complex duration ≥ 120ms, EF ≤35% and dilatation of the left ventricle diastolic diameter \>55mm (LVdD), according to the ESC guidelines in 2007 * HF in NYHA class II, LBBB with QRS complex duration ≥ 150 ms according to the guidelines update in 2010 * optimal pharmacotherapy of HF in the period of three months prior to the study entry. * the expected survival of the patient \> 1 year. Exclusion Criteria: * severe chronic obstructive pulmonary disease (FEV1 \<30%) * inability to perform a stress test on a treadmill

Outcomes

Primary Outcomes

Death

All cause death, data from hospital entries and phone follow-up .

Time frame: Follow up within 5 years from CRT

Heart transplantation

Heart transplantation as the definitive therapy of end-stage heart failure.

Time frame: Follow up within 5 years from CRT

Secondary Outcomes

Positive response to CRT

Positive response to CRT was defined as the improvement in heart failure symptoms of 1 or more NYHA classes

Time frame: Follow up within 1 year from CRT

Data from ClinicalTrials.gov

This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.