Key result
Prolonged anoxia drops turtle heart rate tenfold while maintaining blood pressure via increased vascular resistance.
Why the study?
The cardiovascular function and regulation of freshwater turtles during prolonged anoxia and the factors limiting cardiac performance require comprehensive review.
Population
Freshwater turtles overwintering in ice-covered ponds in North America
Comparison
Cardiac performance and cardiovascular regulation during anoxia/hypoxia
Design
Review
Authors
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May inform myocardial protection strategies in hypoxia; leaves open translation from turtle models to clinical ischemia.
Freshwater turtles survive prolonged anoxia through profound metabolic depression, matching energy consumption with anaerobic ATP production, and maintaining blood pressure despite massive reductions in heart rate and blood flow.
Overgaard et al. (2007) conducted a review in Anoxia/hypoxia in freshwater turtles. Anoxia/hypoxia was evaluated. Prolonged anoxia in freshwater turtles causes tenfold reductions in heart rate and blood flows that match metabolic depression, while blood pressure is maintained through increased vascular resistance.
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