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Related Experiment Videos

Bioenergetic abnormalities associated with severe left ventricular hypertrophy

J Zhang1, H Merkle, K Hendrich

  • 1Department of Medicine, University of Minnesota, Minneapolis.

The Journal of Clinical Investigation
|August 1, 1993
PubMed
Summary

Severe left ventricular hypertrophy (LVH) significantly reduces high-energy phosphates like ATP and CP. These changes are linked to hypertrophy severity, not persistent low blood flow, but tachycardia-induced ischemia worsens them.

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Area of Science:

  • Cardiology
  • Biochemistry
  • Medical Imaging

Background:

  • Left ventricular hypertrophy (LVH) is a cardiac condition often caused by pressure overload.
  • Understanding the metabolic changes in hypertrophied hearts is crucial for managing cardiac function.

Purpose of the Study:

  • To investigate the impact of severe pressure overload-induced LVH on myocardial high-energy phosphate levels.
  • To assess the transmural distribution of ATP, phosphocreatine (CP), and inorganic phosphate (Pi) in hypertrophied hearts.

Main Methods:

  • Utilized transmurally localized 31P-nuclear magnetic resonance spectroscopy (NMR) in dogs with induced LVH.
  • Measured myocardial blood flow using microspheres and calibrated NMR spectra with HPLC analysis of myocardial biopsies.
  • Evaluated high-energy phosphate content under basal conditions and during atrial pacing-induced tachycardia.

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Main Results:

  • Severe LVH hearts showed significantly decreased ATP (42%), CP (58%), and CP/ATP ratio (32%) compared to normal hearts.
  • Adenosine infusion did not normalize these phosphate levels, suggesting they are not due to chronic hypoperfusion.
  • Tachycardia induced CP depletion and Pi accumulation in inner LV layers of hypertrophied hearts, correlating with subendocardial blood flow redistribution.

Conclusions:

  • Severe LVH is associated with significantly reduced myocardial high-energy phosphate levels and CP/ATP ratio.
  • These metabolic abnormalities are proportional to hypertrophy but independent of persistent hypoperfusion.
  • Tachycardia-induced subendocardial ischemia in LVH is linked to pacing-induced perfusion abnormalities and further metabolic derangement.