What question did this study set out to answer?

To examine differences in contractile function and cytosolic energy metabolism between immature and mature rabbit hearts during hypoperfusion, ischemia, and reperfusion.

June 1, 1993AJP Heart and Circulatory Physiology

Metabolic and functional responses of immature and mature rabbit hearts to hypoperfusion, ischemia, and reperfusion

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Population

Immature and mature rabbit hearts

Comparison

Graded hypoperfusion, global ischemia, and… vs Comparison between immature and mature hearts

Design

Preclinical

Authors

GMG. Paul MatherneUniversity of Virginia JHJohn P. HeadrickGriffith University SBStuart S. BerrUniversity of Virginia

Discussion

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Implication

Better post-ischemic recovery in immature hearts appears independent of bioenergetic recovery; leaves open alternative protective mechanisms for translational study.

Key Points

To examine differences in contractile function and cytosolic energy metabolism between immature and mature rabbit hearts during hypoperfusion, ischemia, and reperfusion.
Assessed isolated immature and mature rabbit hearts across baseline, graded hypoperfusion, global ischemia, and reperfusion.
Tracked cytosolic metabolite levels including ATP, phosphocreatine, inorganic phosphate, intracellular pH, and free magnesium concentration.
Contractility declined similarly in both cohorts during graded hypoperfusion and correlated closely with inorganic phosphate accumulation, whereas mature hearts exhibited a greater decline in pH.
Immature hearts demonstrated significantly greater contractile recovery following global ischemia compared to mature hearts (to 93 ± 4% vs. 79 ± 2% of basal function).
Superior recovery in immature hearts occurred independently of ATP, inorganic phosphate, or pH restoration, reflecting enhanced glycolytic activation and superior matching between ATP hydrolysis and synthesis.

Structured PICO

Population

Immature and mature rabbit hearts

Intervention

Graded hypoperfusion, global ischemia, and reperfusion

Comparator

Comparison between immature and mature hearts

Outcome

Contractile function and cytosolic metabolism (ATP, PCr, Pi, pH, Mg2+)surrogate

Immature rabbit hearts show enhanced contractile recovery from global ischemia compared to mature hearts, which appears unrelated to the recovery of standard metabolic parameters.

Cite This Study

Matherne et al. (1993) studied this question.

synapsesocial.com/papers/6a828cc29f5484a76e0f622b https://doi.org/10.1152/ajpheart.1993.264.6.h2141

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Implication

Better post-ischemic recovery in immature hearts appears independent of bioenergetic recovery; leaves open alternative protective mechanisms for translational study.

Metabolic and functional responses of immature and mature rabbit hearts to hypoperfusion, ischemia, and reperfusion

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Metabolic and functional responses of immature and mature rabbit hearts to hypoperfusion, ischemia, and reperfusion

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider