Key Points
- This study aims to investigate the effects of temporary coronary artery occlusion on myocardial purine metabolism in dogs.
- Performed sequential myocardial biopsies to measure ATP and purine levels after ischemia and reperfusion.
- Evaluated samples after 15 min of ischemia, 90 min, and 72 hr of reperfusion.
- Compared values from ischemic zones to nonischemic controls.
- Subendocardial ATP levels were significantly lower in the ischemic zone at 19.9 nmol/mg vs. 38.1 nmol/mg in nonischemic (P < 0.001).
- After 90 min of reperfusion, ATP in the ischemic zone was 26.8 nmol/mg vs. nonischemic (P < 0.025).
- Purine depletion persisted in both subendocardial and subepicardial zones after 72 hr of reperfusion (P < 0.05).
Structured PICO
PPopulationCanine model (dogs)
IIntervention15 minutes of temporary coronary artery occlusion followed by reperfusion
CComparatorControl, nonischemic myocardial sites
OOutcomeMyocardial ATP and total purine pool concentrationssurrogate
Brief episodes of myocardial ischemia without necrosis cause prolonged depletion of ATP and total purine pools, indicating sustained metabolic derangement.