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- W2023962856 abstract "The ability of 1-carboxymethyl-2-iminoimidazolidine (cyclocreatine), a synthetic creatine analog, to protect myocardium during global ischemia was assessed in isovolumic rat hearts using phosphorus-31 nuclear magnetic resonance spectroscopy. Wistar rats were fed a 1% cyclocreatine diet. After 2 weeks, cyclocreatine-fed (n = 8) and control (n = 7) rats were anesthetized, the heart was excised and retrograde perfusion was begun at 10 ml/min per g with 37 degrees C, phosphate-free buffer containing glucose and oxygen. Hemodynamic and spectroscopic data were obtained during baseline, ischemia and recovery periods (each 24 min). During ischemia, the heart of control rats developed a rigor-like increase in tonic pressure (ischemic contracture) not seen in the heart of cyclocreatine-fed rats (22 versus 1 mm Hg, p less than 0.01). This change was associated with significantly more adenosine triphosphate (ATP) at end-ischemia in the cyclocreatine group (1.6 versus 0.6 mumol/g, p less than 0.01) and delayed development of acidosis (p less than 0.001). With reperfusion, the heart of cyclocreatine-fed rats spontaneously defibrillated sooner than did the heart in control rats (178 versus 346 s, p less than 0.03). Diastolic pressure remained significantly elevated throughout recovery in control hearts compared with treated hearts (p less than 0.001). Prior feeding with cyclocreatine preserves myocardial adenosine triphosphate during ischemia, delays the development of acidosis and ischemic contracture and improves recovery of mechanical function on reperfusion." @default.
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- W2023962856 date "1989-07-01" @default.
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- W2023962856 title "Myocardial protection during ischemia by prior feeding with the creatine analog: Cyclocreatine" @default.
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- W2023962856 doi "https://doi.org/10.1016/0735-1097(89)90081-8" @default.
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