Key Points
- To investigate changes in extracellular potassium activity after acute coronary artery occlusion and its relation to ventricular activation in swine.
- Utilized potassium-sensitive electrodes made from a valinomycin-polyvinyl chloride matrix.
- Studied time course and magnitude of K+ changes after ligation of the left anterior descending coronary artery.
- Monitored ventricular electrograms alongside potassium activity changes.
- Observed a rapid increase in K+ levels after occlusion, peaking during the first 15 minutes.
- K+ changes were reversed by occlusion release in earlier phases but not during the prolonged K+ rise phase.
- Identified inhomogeneities in K+ rise across different areas of the ischemic zone, indicating it as a marker for ischemia.
Structured PICO
IInterventionAcute ligation of the left anterior descending coronary artery
OOutcomeTime course, magnitude and homogeneity of the change in extracellular myocardial potassium activitysurrogate
In a swine model of acute coronary occlusion, extracellular potassium rises rapidly in three distinct phases and exhibits spatial inhomogeneity, serving as an excellent marker of ischemia that parallels ventricular activation changes.