Related Experiment Video

Updated: Jun 8, 2026

A Pacing-Controlled Procedure for the Assessment of Heart Rate-Dependent Diastolic Functions in Murine Heart Failure Models
07:49

A Pacing-Controlled Procedure for the Assessment of Heart Rate-Dependent Diastolic Functions in Murine Heart Failure Models

Published on: July 21, 2023

Chronotropic incompetence and its relation to exercise intolerance in hypertrophic cardiomyopathy

Georgios K Efthimiadis1, Georgios Giannakoulas, Despina G Parcharidou

  • 1Cardiomyopathies Laboratory, First Cardiology Department, AHEPA Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece. efthymos@med.auth.gr

International Journal of Cardiology
|September 21, 2010
PubMed

Insights

Blunted heart rate response to exercise, known as chronotropic incompetence, is common in hypertrophic cardiomyopathy (HCM) and significantly impacts exercise capacity.

Area of Science:

  • Cardiology
  • Exercise Physiology

Background:

  • Diminished functional capacity is a frequent issue in hypertrophic cardiomyopathy (HCM).
  • The mechanisms behind this reduced capacity are complex and not fully understood.

Purpose of the Study:

  • To investigate the prevalence of chronotropic incompetence in patients with HCM.
  • To determine the relationship between chronotropic incompetence and exercise intolerance in this population.

Main Methods:

  • Cardiopulmonary exercise testing was conducted on 68 patients diagnosed with HCM.
  • Chronotropic incompetence was quantified using the chronotropic index, and exercise capacity was measured by peak oxygen consumption (peak Vo2).

Main Results:

  • Chronotropic incompetence was identified in 50% of HCM patients.
  • This condition was associated with higher NYHA class, atrial fibrillation history, increased cardiac MRI-assessed fibrosis, and use of specific medications (beta-blockers, amiodarone, warfarin).
  • Male gender, atrial fibrillation, left ventricular outflow tract obstruction (LVOTO), and heart rate reserve were independent predictors of exercise capacity.

Conclusions:

  • A blunted heart rate response to exercise is a common finding in hypertrophic cardiomyopathy.
  • This impaired chronotropic response is a key factor contributing to reduced exercise capacity in HCM patients.
Abstract

More Related Videos

Integration of Brain Tissue Saturation Monitoring in Cardiopulmonary Exercise Testing in Patients with Heart Failure04:20

Integration of Brain Tissue Saturation Monitoring in Cardiopulmonary Exercise Testing in Patients with Heart Failure

Published on: October 1, 2019

Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix10:21

Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix

Published on: June 14, 2016

Related Concept Videos

Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
Cardiomyopathy V: Interprofessional Care01:29

Cardiomyopathy V: Interprofessional Care

Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
Cardiomyopathy I: Introduction and Classification01:25

Cardiomyopathy I: Introduction and Classification

Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...