Effect of APC with isoflurane on H2O2 induced stress and survival of isolated cardiomyocytes from WT (n=9) and Kir6.2 KO (n=6) hearts. Percent cell death was determined in four experimental groups: time control (Time Ctrl), oxidative stress with H2O2 (Stress), stress following cell exposure to isoflurane (APC), and stress in isoflurane-pretreated myocytes during blockade of KATP channels with 5HD (APC+5HD). Data are mean±SEM, *P< 0.05 vs. Time Ctrl; #P< 0.05 vs. Stress; §P< 0.05 vs. APC. Left panel: Pretreatment with isoflurane protected WT myocytes from stress. Blockade of mitoKATP channels with 5HD abolished this protection. Right panel: Pretreatment with isoflurane protected Kir6.2 KO myocytes from stress. However, isoflurane-induced protection of Kir6.2 KO myocytes was not altered by 5HD (APC vs. APC+5HD).