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Do the cardiac nerves optimise efficiency?

M I Noble1, A J Drake-Holland

  • 1Charing Cross & Westminster Medical School, Chelsea & Westminster Hospital, London, England.

Basic Research in Cardiology
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Removing cardiac nerves in dogs revealed metabolic inefficiency, suggesting nerves optimize heart efficiency. This finding may offer insights into evolutionary pressures on cardiac function.

Area of Science:

  • Cardiology
  • Physiology
  • Evolutionary Biology

Background:

  • The role of cardiac nerves in optimizing myocardial efficiency is not fully understood.
  • Previous studies suggest cardiac innervation influences metabolic processes in the heart.

Purpose of the Study:

  • To investigate the impact of cardiac nerve removal on myocardial efficiency and metabolic function in dogs.
  • To evaluate the hypothesis that cardiac nerves optimize heart efficiency.

Main Methods:

  • Surgical denervation of cardiac nerves in anesthetized dogs.
  • Allowing for post-ganglionic sympathetic nerve fiber and myocardial catecholamine degeneration.
  • Measuring myocardial oxygen consumption, glucose oxidation, uncoupled oxygen consumption, and sodium-potassium ATPase activity.

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Main Results:

  • Denervation led to increased myocardial oxygen consumption for a given work output, indicating metabolic inefficiency.
  • Inhibition of glucose oxidation and increased uncoupled oxygen consumption were observed.
  • Enhanced sodium-potassium ATPase activity was detected post-denervation.

Conclusions:

  • Cardiac nerves appear to optimize myocardial efficiency.
  • The findings support the hypothesis that cardiac innervation plays a crucial role in metabolic regulation of the heart.
  • While potentially relevant to earlier evolutionary periods, the direct evolutionary pressure for this mechanism in modern humans is questioned.