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Related Experiment Videos

Linear end-systolic pressure-volume relationship during pulsatile left ventricular bypass represents native heart

O Kawaguchi1, J S Sapirstein, W B Daily

  • 1Department of Surgery, College of Medicine, Milton S. Hershey Medical Center, Pennsylvania State University, Hershey 17033, USA.

The Journal of Thoracic and Cardiovascular Surgery
|April 1, 1995
PubMed
Summary

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The end-systolic pressure-volume relationship accurately reflects native heart function during pulsatile left ventricular bypass without altering loading conditions. This method provides reliable insights into systolic function, even with reduced pumping rates.

Area of Science:

  • Cardiology
  • Physiology
  • Biomedical Engineering

Background:

  • The end-systolic pressure-volume relationship (ESPVR) is a key indicator of left ventricular systolic function.
  • Assessing native heart function during mechanical circulatory support presents challenges due to altered loading conditions.

Purpose of the Study:

  • To evaluate if ESPVR obtained during pulsatile left ventricular bypass without interventions accurately represents native heart function.
  • To determine the reliability of ESPVR measurements under varying degrees of ventricular unloading.

Main Methods:

  • Utilized 11 Holstein calves under anesthesia, measuring left ventricular pressure and volume.
  • Calculated ESPVR using linear regression analysis on end-systolic pressure and volume data.
  • Obtained ESPVR during caval/aortic occlusions (control) and asynchronous pulsatile left ventricular bypass at different unloading levels (100%, 80%, 60%, 40%).

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Main Results:

  • Control ESPVR showed high linearity (median r = 0.941).
  • ESPVR linearity decreased at 100% unloading (median r = 0.669) but improved significantly at reduced rates (80%: r=0.819, 60%: r=0.868, 40%: r=0.899).
  • ESPVR slopes at reduced unloading rates did not significantly differ from control values.

Conclusions:

  • ESPVR obtained during asynchronous, pulsatile left ventricular bypass without exogenous load changes effectively represents native left ventricular systolic function.
  • Reduced unloading rates during bypass allow for reliable assessment of intrinsic systolic performance.
  • This method offers a valuable tool for evaluating heart function during mechanical support.