Intracellular pH measurement during cardiac arrest in ventricular myocardium by Bretschneider's cardioplegic solution HTK and St. Thomas Hospital solution with and without procaine.

Intracellular pH (pHi) has been measured in human or cat ventricular muscle during 60, 120 and 180 minutes of cardiac arrest by Bretschneider's cardioplegic solution HTK or St. Thomas solution with and without procaine. In 319 control measurements in modified Tyrode's solution pHi (mean, S.