Intracellular K+ activity, intracellular Na+ activity and maximum diastolic potential of @entity235 subendocardial Purkinje cells from one-day-old XXXX .

@entity235 @entity1372 @entity299 @entity1188 @entity741 @entity972
The basis for the reduced maximum diastolic potential of @entity235 @entity299 surviving one day after extensive transmural @entity1188 was investigated, using double-barrel @entity972 and @entity1372 ion-sensitive microelectrodes. The maximum diastolic potential of Purkinje fibers in @entity1188 preparations from the left ventricular apex measured during the first hour of superfusion in a tissue bath was -50.1 +/- 13.7 mV, a value markedly reduced from the value in control Purkinje fibers from noninfarcted preparations (-85.0 +/- 4.5 mV). The intracellular @entity972 ion activity was reduced by 50.4 mM during this time (intracellular @entity972 ion activity equals 61.6 +/- 16.1 mM, as compared to control intracellular @entity972 ion activity of 112 +/- 19.8 mM). The @entity972 equilibrium potential was reduced by 16.0 mV (from -97.2 +/- 4.7 mV in controls to -81.2 +/- 6.9 mV), thus accounting for about one half of the reduction in the maximum diastolic potential. After 6 hours of superfusion, the maximum diastolic potential increased to -78.9 +/- 8.7 mV (still significantly less than control). The @entity972 equilibrium potential had largely recovered (-93.8 +/- 5.9 mV). The intracellular @entity1372 ion activity of Purkinje fibers in the @entity1188 (15.6 +/- 6.9 mM) was elevated during the first hour of superfusion by 6.2 mM compared to control (9.4 +/- 2.6 mM), and this was only 12% as much as the initial intracellular @entity972 ion activity decrease. @entity1372 ion activity after 3-6 hours of superfusion was not significantly different than normal (12.1 +/- 4.9 mM). In conclusion, only a portion of the maximum diastolic potential changes can be explained by a reduction of the @entity972 equilibrium potential. It is likely that change(s) in the cell membrane @entity1372 - @entity972 pump's function and in the membrane conductance are also involved. Furthermore, the lack of a compensatory increase in intracellular @entity1372 ion activity accompanying the large reduction of intracellular @entity972 ion activity may be a consequence of the cellular acidosis, which is known to occur during @entity741 .
