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Related Experiment Videos

Relationship between external load and isolated myocyte contractile function with CHF in pigs

Z Wang1, C F Lam, R Mukherjee

  • 1Division of Cardiothoracic Surgery, Medical University of South Carolina, Charleston 29425, USA.

The American Journal of Physiology
|July 1, 1997
PubMed
Summary

Congestive heart failure (CHF) impairs the ability of isolated heart cells to respond to increased load. This study shows that CHF-affected myocytes have a reduced capacity to contract under load, contributing to pump dysfunction.

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Area of Science:

  • Cardiology
  • Cellular Physiology

Background:

  • Previous research established a load-contractility relationship in papillary muscles.
  • The behavior of isolated myocytes under varying loads, especially in congestive heart failure (CHF), remained less understood.

Purpose of the Study:

  • To investigate the load-contractility relationship in isolated left ventricular (LV) myocytes from normal and supraventricular tachycardia-induced CHF (SVT-CHF) pigs.
  • To determine if CHF affects myocyte contractile performance under increased external loads.

Main Methods:

  • Isolated LV myocytes from normal and SVT-CHF pigs were subjected to incrementally increased external resistive loads using precalibrated microspheres.
  • Myocyte contractile performance, including shortening extent and velocity, was assessed using videomicroscopy.

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Main Results:

  • A significant reduction in unloaded shortening extent was observed in SVT-CHF myocytes compared to controls.
  • Inverse relationships between relative resistive load and myocyte contractile function were confirmed in both normal and CHF states.
  • SVT-CHF myocytes exhibited a greater reduction in shortening extent under equivalent higher loads and a reduced slope for velocity of shortening, indicating impaired load-dependent contractility.

Conclusions:

  • This study provides the first demonstration of a load-dependent relationship in intact isolated LV myocytes in both normal and CHF states.
  • The diminished capacity of SVT-CHF myocytes to respond to increased resistive loads is a key factor contributing to left ventricular pump dysfunction in this model of heart failure.