PMID: 38364Sep 1, 1979

Intramyocardial pH as an index of myocardial metabolism during cardiac surgery

The Journal of Thoracic and Cardiovascular Surgery
F J WaltersD C MacGregor

Abstract

At present, a practical method for continuous monitoring of the state of tissue metabolism in the individual patient's heart during cardiac operations is not available. We have explored the use of miniature electrode measurements of myocardial interstitial pH to provide this monitoring capability, making comparisons with intracellular pH in left ventricular biopsy specimens and with tissue PCO2 measured by mass spectrometry. The electrode system consisted of a hydrogen ion-sensitive glass miniature electrode, housed in the beveled end of a 21 gauge (0.8 mm diameter) hypodermic needle, and a 2 mm diameter reference electrode, with an internal silver-silver chloride electrode coupled to tissue through a saline bridge (150 mM/L sodium chloride) saturated with silver chloride. Accuracy in blood at 37 degrees C was compared with conventional instrumentation (Radiometer BMS-3 MK-2 Blood Micro System) over a pH range of 7.4 to 6.4 with linear regression analysis (n = 26) revealing a high correlation (r = 0.997) and a mean difference in paired observations of only 0.01 +/- 0.004 (mean +/- SEM) pH units. In two groups of dogs on cardiopulmonary bypass, the pH needle and reference electrodes were inserted into the anterior wall of the le...Continue Reading

Related Concepts

Metabolic Process, Cellular
Microelectrodes
Left Ventricular Structure
Protoplasm
Interstitial
Discipline of Heart Surgery
Myocardium
Quick Freeze
Cardiac Surgery Procedures
Mass Spectrometry

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