Hyperpolarized XXXX with a @entity972 -channel opener, aprikalim.

@entity972 @entity63 @entity95 @entity1167 @entity6564 @entity855
Cardioplegic solutions that arrest the heart at or near the resting membrane potential may provide better myocardial protection than standard depolarizing @entity6564 by reducing both metabolic demand and harmful transmembrane ion fluxes. This hypothesis was investigated in an isolated, blood-perfused, @entity95 heart Langendorff model during 30 minutes of normothermic global @entity63 . Hyperpolarized @entity1167 induced by aprikalim, an opener of @entity855 -dependent @entity972 channels, was compared with @entity6564 depolarized arrest and with unprotected global @entity63 . Left ventricular pressure was recorded over a wide range of balloon volumes before @entity63 and 30 minutes after reperfusion. End-diastolic pressure versus balloon volume data were fitted to a two-coefficient exponential relationship. Changes in the diastolic compliance of the left ventricle were assessed by comparison of preischemic and postischemic coefficients within each cardioplegia group. Postischemic recovery of developed pressure was used to assess changes in left ventricular systolic function. The tissue water content of each heart was also determined. Myocardial protection with aprikalim resulted in better postischemic recovery of developed pressure (90% +/- 9%) than either protection with @entity6564 (73% +/- 11%) or no protection (62% +/- 9%). Myocardial tissue water content in hearts protected with @entity6564 (77.4% +/- 1.4%) was less than the tissue water content of either unprotected hearts (79.4% +/- 1.2%) or hearts protected with aprikalim (78.7% +/- 0.9%). Despite these differences, neither @entity6564 (p = 0.15) nor aprikalim cardioplegia (p = 0.30) was associated with a significant postischemic decrease in ventricular compliance. By contrast, unprotected global @entity63 was associated with a significant decrease in ventricular compliance (p < 0.001).
