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Related Concept Videos

Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
Pulmonary Edema II: Pathophysiology01:18

Pulmonary Edema II: Pathophysiology

Pulmonary edema is the accumulation of fluid in the interstitial and alveolar spaces of the lungs, impairing gas exchange and oxygen delivery. It may be cardiogenic or noncardiogenic, but both reduce oxygenation and lung compliance.Cardiogenic Pulmonary EdemaCardiogenic edema results from increased hydrostatic pressure in pulmonary capillaries, usually due to left ventricular dysfunction from myocardial infarction, heart failure, or valvular disease. Ineffective cardiac pumping causes blood to...
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...
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...

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Association between locomotor muscle quality and cardiac function during exercise in heart failure with preserved ejection fraction.

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Tirzepatide Reduces LV Mass and Paracardiac Adipose Tissue in Obesity-Related Heart Failure: SUMMIT CMR Substudy.

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Related Experiment Video

Updated: May 27, 2026

Evaluation of Right Ventricular Function in Experimental Models of Pulmonary Arterial Hypertension
10:03

Evaluation of Right Ventricular Function in Experimental Models of Pulmonary Arterial Hypertension

Published on: June 27, 2025

Pulmonary capillary wedge pressure augments right ventricular pulsatile loading.

Ryan J Tedford1, Paul M Hassoun, Stephen C Mathai

  • 1Division of Cardiology, Johns Hopkins Medical Institutions, Ross 858, 720 Rutland Ave, Baltimore, MD 21205, USA.

Circulation
|December 2, 2011
PubMed
Summary

Pulmonary vascular resistance and compliance are inversely related in pulmonary hypertension and fibrosis. Elevated pulmonary capillary wedge pressure, however, increases right ventricular afterload, potentially worsening dysfunction.

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Last Updated: May 27, 2026

Evaluation of Right Ventricular Function in Experimental Models of Pulmonary Arterial Hypertension
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Chronic Thromboembolic Pulmonary Hypertension and Assessment of Right Ventricular Function in the Piglet

Published on: November 4, 2015

Area of Science:

  • Cardiology
  • Pulmonary Medicine
  • Physiology

Background:

  • Right ventricular failure is a significant cause of mortality, often linked to pulmonary vascular loading.
  • Understanding how diseases affect pulmonary vascular resistance (RPA) and compliance (CPA) is crucial but remains incomplete.
  • The relationship between RPA and CPA in the pulmonary circulation, particularly under disease states, requires further elucidation.

Purpose of the Study:

  • To test the hypothesis that RPA and CPA are consistently and inversely related in the pulmonary circulation, irrespective of age, pulmonary hypertension, or fibrosis.
  • To investigate whether elevated pulmonary capillary wedge pressure alters the RPA-CPA relationship and augments right ventricular pulsatile load.

Main Methods:

  • Analysis of large clinical databases containing right heart/pulmonary catheterization data.
  • Determination of the RPA-CPA relationship across various conditions including pulmonary hypertension, pulmonary fibrosis, age, and pulmonary capillary wedge pressure.
  • Statistical analysis to assess the consistency and variability of the resistance-compliance product.

Main Results:

  • A consistent hyperbolic (inverse) dependence between RPA and CPA was observed in patients with pulmonary hypertension and normal pulmonary capillary wedge pressure (CPA = 0.564 / (0.047 + RPA)).
  • The pulmonary resistance-compliance product remained near-constant (0.48 ± 0.17 seconds), unlike the highly variable systemic product.
  • Severe pulmonary fibrosis and increasing age had minimal impact on the RPA-CPA relationship, while elevated pulmonary capillary wedge pressure significantly lowered CPA and negatively correlated with the resistance-compliance product.

Conclusions:

  • The inverse relationship between pulmonary vascular resistance and compliance is robust across pulmonary hypertension and fibrosis, with minimal age-related changes.
  • This fixed relationship explains challenges in reducing right ventricular afterload with therapies targeting mean RPA.
  • Elevated pulmonary capillary wedge pressure increases net right ventricular afterload by augmenting pulsatile load, potentially contributing to right ventricular dysfunction.