Key result
Hypoxia decreased ATP concentration to 39% of control in adult rabbits after 60 minutes, whereas newborn rabbits maintained normal ATP levels and glycolysis during 30 minutes of hypoxia.
Why the study?
Does hypoxia differentially affect myocardial high-energy phosphate content in newborn versus adult rabbit hearts?
Population
Newborn, 2-week-old, and adult rabbit ventricular septa
Comparison
Hypoxia vs Control
Design
Preclinical
Follow-up
Up to 60 minutes
Authors
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Supports greater hypoxic resilience in immature myocardium; leaves open clinical translation to neonatal care.
Does hypoxia differentially affect myocardial high-energy phosphate content in newborn versus adult rabbit hearts?
Newborn rabbit hearts are more capable of maintaining glycolysis and normal ATP levels during hypoxia compared to adult hearts, preserving mechanical function for longer periods.
Jarmakani et al. (1978) studied Hypoxia. Hypoxia (95% N2 and 5% CO2) vs. Control (95% O2 and 5% CO2) was evaluated on Myocardial high-energy phosphate content (ATP and creatine phosphate). Hypoxia decreased ATP concentration to 39% of control in adult rabbits after 60 minutes, whereas newborn rabbits maintained normal ATP levels and glycolysis during 30 minutes of hypoxia.
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