Modification of intramuscular pH oscillations in the isolated perfused rat heart by different interventions

Canadian Journal of Physiology and Pharmacology
J C YatesN S Dhalla


Changes in the intramuscular pH oscillations were examined by the use of an antimony electrode upon perfusing the isolated rat heart under different experimental conditions. The pH oscillations were decreased upon perfusing the hearts with Na+- or Ca2+-free medium and increased upon perfusing with K+-free medium. Increasing the temperature of perfusion medium from 25 to 40 degrees C or omitting glucose from the perfusing medium decreased the magnitude of oscillations. On the other hand, complete interruption of the perfusion flow resulted in an increase in the amplitude of pH oscillation. An initial increase followed by a decrease in the pH oscillation was seen when hearts were perfused with medium containing lactic acid at pH 6.6. These results suggest that pH oscillations reflect fluctuations in myocardial metabolism.


May 1, 1980·Journal of Pharmacological Methods·N S DhallaR J Hoeschen
Oct 1, 1982·Journal of Dental Research·I KleinbergL Wijeyeweera

Related Concepts

Metabolic Process, Cellular
Lactic Acid Measurement
Metabolic Pathway
Antimony Measurement

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