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Related Concept Videos

Exercise Stress Test01:26

Exercise Stress Test

366
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
366

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Related Experiment Video

Updated: Aug 22, 2025

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Does recovery from submaximal exercise predict response to cardiac resynchronisation therapy?

Philippe Wouters1,2, Thijs Schoots3,4, Victor Niemeijer5

  • 1Department of Cardiology, Máxima Medisch Centrum, Eindhoven, The Netherlands p.wouters@umcutrecht.nl.

Open Heart
|November 14, 2022
PubMed
Summary

Submaximal exercise oxygen uptake kinetics, not peak values, predict cardiac resynchronisation therapy (CRT) response in heart failure patients. Fast oxygen uptake kinetics during exercise onset and recovery indicate better CRT outcomes.

Keywords:
Cardiomyopathy, DilatedHEART FAILUREHeart Failure, SystolicOutcome Assessment, Health CarePacemaker, Artificial

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Area of Science:

  • Cardiology
  • Exercise Physiology
  • Heart Failure Management

Background:

  • Cardiac resynchronisation therapy (CRT) decision-making often omits exercise parameters.
  • Submaximal exercise metrics may better represent daily functional capacity in heart failure (HF) patients than maximal exertion tests.
  • Identifying optimal predictors of CRT response is crucial for patient selection.

Purpose of the Study:

  • To compare various exercise parameters for their ability to predict response to CRT.
  • To determine if submaximal exercise parameters are superior to maximal parameters in predicting CRT response.

Main Methods:

  • 31 chronic heart failure patients underwent submaximal and maximal exercise testing before and 3 months after CRT.
  • Measured parameters included submaximal oxygen uptake kinetics (onset and recovery), peak oxygen uptake (VO2 peak), and oxygen uptake efficiency slope (OUES).
  • CRT response was defined as a ≥15% relative reduction in end-systolic volume.

Main Results:

  • Fast submaximal oxygen uptake kinetics (VO2 onset and recovery) were significantly associated with CRT response (AUC=0.719, p<0.05), independent of age, NYHA class, and VO2 peak.
  • VO2 peak (AUC=0.632) and OUES (AUC=0.577) did not predict CRT response.
  • Patients with fast submaximal VO2 kinetics (<60s) showed significantly higher response rates (91-92%) compared to those with slower kinetics (40-43%).

Conclusions:

  • Impaired VO2 kinetics during submaximal exercise may be an objective, age-independent marker for predicting non-response to CRT.
  • Maximal exercise parameters do not appear to predict CRT response effectively.
  • VO2 kinetics assessment is feasible and potentially valuable, warranting further investigation in larger studies.