Key result
Increasing workload raises myocardial oxygen consumption while preserving high-energy phosphates in crystalloid-perfused hearts.
Why the study?
It has been suggested that oxygenation of the isolated, crystalloid perfused Langendorff rabbit heart is inadequate and limits mechanical performance, but this has not been investigated in the isolated working rabbit heart.
The crystalloid perfused working rabbit heart is adequately oxygenated to meet increased workload demands without depleting high energy phosphates.
Answers are grounded in this paper and cite their sources.
Affirms crystalloid-perfused rabbit heart model suitability for workload studies; leaves open translation to blood-perfused or in vivo settings.
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Murashita et al. (1991) studied Isolated working rabbit heart. Increasing preload and afterload vs. Fixed preload or afterload was evaluated on Left ventricular power and myocardial oxygen consumption. Increasing workload in the crystalloid perfused working rabbit heart increased myocardial oxygen consumption and maintained comparable high energy phosphates, suggesting adequate oxygenation.
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