The time course of myocardial high-energy phosphate degradation during potassium cardioplegic arrest.

Abstract:

:Myocardial high-energy phosphate and glucose-6-phosphate levels were determined in the in vivo pig heart model during ischemic arrest and reperfusion to determine the effectiveness of potassium cardioplegia in myocardial protection. Thirty-five pigs were divided into six experimental groups consisting of 2-hour normothermic arrest, 2-hour hypothemic arrest, 2-hour normothermic cardioplegic arrest, and 1-, 2-, and 3-hour hypothermic cardioplegic arrest. Myocardial biopsies from the left ventricle were obtained prior to arrest, every 30 minutes during the arrest interval, and at 30 and 60 minutes of reperfusion. The measurement of adenosine triphosphate and creatine phosphate showed that (1) cardioplegic arrest requires hypothermia to preserve high-energy phosphate levels in myocardial tissue; (2) hypothermia, while not completely protective alone, is more effective than potassium cardioplegia alone in providing myocardial preservation during 2-hour ischemic arrest; (3) the combination of potassium cardioplegia and hypothermia is additive in providing an effective means of maintaining myocardial high-energy phosphate stores during 1, 2, and 3 hours of ischemic arrest; (4) myocardial reperfusion does not allow a return to preischemic adenosine triphosphate (ATP) levels after 2 hours of arrest, except following hypothermic cardioplegia; and (5) extension of the duration of ischemic arrest to 3 hours using hypothermic cardioplegia prevents recovery of high-energy phosphate stores to preischemic levels during reperfusion. Optimal preservation can be achieved during 2 hours of ischemic arrest by using hypothermic potassium cardioplegia. The effects of myocardial reperfusion, however, prevent full ATP and creatine phosphate (CP) recovery following 3 hours of arrest. No other technique studied was as effective in providing myocardial preservation.

journal_name

Surgery

journal_title

Surgery

authors

Engelman RM,Rousou JH,Longo F,Auvil J,Vertrees RA

subject

Has Abstract

pub_date

1979-07-01 00:00:00

pages

138-47

issue

1

eissn

0039-6060

issn

1532-7361

pii

0039-6060(79)90140-5

journal_volume

86

pub_type

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