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Perfusion-contractility matching during Fontan circulation.

G Szabó¹, V Buhmann, A Graf

¹Department of Cardiac Surgery, University of Heidelberg, Germany.

Biomedizinische Technik. Biomedical Engineering

|December 6, 2002

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This study reveals that coronary perfusion pressure (CPP) significantly impacts myocardial contractility, especially under Fontan circulation conditions. Elevated right atrial pressure (RAP) further diminishes contractility as CPP decreases.

Area of Science:

Cardiovascular Physiology
Cardiac Surgery Research

Background:

The Fontan procedure creates a unique circulatory state impacting cardiac function.
Understanding myocardial contractility under altered pressures is crucial for Fontan patients.

Purpose of the Study:

To investigate the relationship between coronary perfusion pressure (CPP) and myocardial contractility.
To assess the effect of elevated right atrial pressure (RAP) on this relationship in a Fontan circulation model.

Main Methods:

Experimental model using anesthetized open-chest dogs.
Isolated perfused coronary arteries to measure CPP and myocardial contractility (Ees).
Acute elevation of RAP at varying CPP levels.

Main Results:

Related Experiment Videos

CPP-Ees relationship followed a biphasic J-shaped curve, similar before and during Fontan circulation.
A critical CPP threshold was identified below which contractility decreased progressively.
Elevated RAP significantly reduced Ees at lower CPPs (75 and 60 mmHg) but not at 100 mmHg.

Conclusions:

Both coronary arterial and venous pressures are critical determinants of myocardial contractility post-Fontan procedure.
RAP elevation exacerbates the negative impact of reduced CPP on contractility.