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Related Concept Videos

Cardiomyopathy II: Dilated Cardiomyopathy01:30

Cardiomyopathy II: Dilated Cardiomyopathy

Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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 III: Clinical Manifestations01:26

Heart Failure III: Clinical Manifestations

Heart failure (HF) manifests primarily as dyspnea, fatigue, and fluid retention, resulting in peripheral and pulmonary edema. Symptoms may vary depending on which ventricle is more affected, left or right.Left-Sided Heart FailureAlso known as left ventricular failure, this condition results from the left ventricle's inability to fill or eject sufficient blood into the systemic circulation. It leads to pulmonary congestion, which occurs when the left ventricle fails to eject blood effectively...
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...
Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. 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...

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Related Experiment Video

Updated: Jul 16, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
07:09

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Published on: February 20, 2017

Pulmonary function changes associated with cardiomegaly in chronic heart failure.

Thomas P Olson1, Kenneth C Beck, Bruce D Johnson

  • 1Division of Cardiovascular Diseases, Department of Internal Medicine, Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA.

Journal of Cardiac Failure
|March 31, 2007
PubMed
Summary

Increased heart size in heart failure (HF) patients significantly restricts lung volumes and airflow, contributing to breathing difficulties. This study highlights cardiac enlargement as a key factor in restrictive lung patterns observed in HF.

Related Experiment Videos

Last Updated: Jul 16, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
07:09

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Published on: February 20, 2017

Area of Science:

  • Cardiology
  • Pulmonology
  • Medical Imaging

Background:

  • Heart failure (HF) is often associated with altered lung function.
  • The impact of cardiac enlargement on lung volumes and airflow in HF requires further investigation.

Purpose of the Study:

  • To investigate the influence of increased cardiac size on maximal lung volumes, forced expiratory airflows, and lung diffusing capacity in HF patients.
  • To compare these parameters between HF patients of varying disease severity and healthy controls.

Main Methods:

  • Recruited 41 HF patients (NYHA class I/II and III/IV) and matched controls.
  • Utilized echocardiography, spirometry, and chest radiography (RAD) for volumetric analysis of thoracic structures.
  • Assessed total thoracic cavity (TTC), diaphragm, heart, and lung volumes.

Main Results:

  • No significant difference in total thoracic cavity volume between groups.
  • Significantly increased cardiac volumes (echocardiography and RAD) in HF patients compared to controls.
  • Reduced lung volumes correlated with HF disease severity.
  • Cardiac volume showed a strong inverse relationship with forced vital capacity and forced expiratory volume in 1 second.

Conclusions:

  • Cardiac enlargement significantly constrains lung capacity in HF patients.
  • Increased cardiac size is a major contributor to restrictive breathing patterns observed in heart failure.
  • These findings emphasize the mechanical impact of cardiac remodeling on respiratory mechanics in HF.