Myocardial hypoxia is accompanied by increased epicardial potassium activity. In this experimental study in rabbits (n = 13), with ion-selective probes, we correlated our findings with an exact evaluation of myocardial oxygen tension, hemodynamic data and arterial and venous blood gas analysis. The epicardial potassium activity had good correlation with these parameters (pm = -0.95, pco = -0.93 and pa = -0.72, pv = -0.96, respectively). Therefore, the clinical use of these electrodes can be recommended for continuous monitoring in intensive care units.
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