Key result
In isolated trout hearts, the threshold oxygen tension for maintaining maximum cardiac output was 25-46 Torr, and increasing pacing to 58 beats/min significantly reduced maximum stroke volume.
Why the study?
How do hypoxia and increased pacing frequency affect maximum cardiac performance in isolated perfused trout hearts?
How do hypoxia and increased pacing frequency affect maximum cardiac performance in isolated perfused trout hearts?
In isolated perfused trout hearts, hypoxia impairs maximum power output at higher oxygen tensions than cardiac output, and increased pacing frequency reduces maximum stroke volume due to compromised atrial filling time.
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May inform hypoxia limits on fish cardiac output; leaves open translation to mammalian or clinical settings.
Farrell et al. (1989) studied Isolated, saline-perfused trout hearts. Hypoxic perfusion and increased pacing frequency was evaluated on Maximum cardiac performance (cardiac output and power output). In isolated trout hearts, the threshold oxygen tension for maintaining maximum cardiac output was 25-46 Torr, and increasing pacing to 58 beats/min significantly reduced maximum stroke volume.
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