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Related Experiment Videos

The isolated working mouse heart: methodological considerations.

T S Larsen1, D D Belke, R Sas

  • 1Department of Physiology and Biophysics, University of Calgary, Faculty of Medicine, Calgary, Alberta, Canada T2N 4N1. terjel@fagmed.uit.no

Pflugers Archiv : European Journal of Physiology
|June 17, 1999
PubMed
Summary
This summary is machine-generated.

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This study developed a working isolated mouse heart model for cardiovascular research. High-fidelity pressure measurements are crucial for accurately assessing left ventricular (LV) preload and afterload, as reservoir heights are unreliable indicators.

Area of Science:

  • Cardiovascular Physiology
  • Animal Models
  • Biomedical Engineering

Background:

  • Genetically engineered mice are vital in cardiovascular research.
  • There is a need for miniaturized technology to study these models.
  • An isolated working murine heart model is essential for detailed functional analysis.

Purpose of the Study:

  • To develop a functional isolated working mouse heart model.
  • To assess left ventricular (LV) function under controlled conditions.
  • To evaluate the reliability of pressure measurements versus reservoir heights for LV preload and afterload assessment.

Main Methods:

  • Isolated working mouse heart perfused with Krebs-Henseleit buffer.
  • Left ventricular (LV) pressure measured via micromanometer.

Related Experiment Videos

  • Electrical pacing controlled heart rate; preload and afterload adjusted.
  • Cardiac output (CO) determined by aortic and coronary flows.

    • Main Results:

    • Increasing LV end-diastolic pressure (LVEDP) significantly increased cardiac power.
    • Myocardial contractility and LV developed pressure showed minimal increases.
    • Cardiac power, LV developed pressure, and dP/dt remained stable up to 400 beats/min.
    • Higher heart rates led to decreased LVEDP, cardiac power, and ejection.

    Conclusions:

    • High-fidelity intraventricular pressure measurement is essential for accurate LV preload and afterload assessment.
    • External reservoir heights are unreliable indicators of LV loading conditions.
    • The developed model provides a platform for studying cardiac function in mice.