Abstract:
:The effect of glucocorticoid on the metabolism and contractility in the stunned myocardium was examined by phosphorus 31 nuclear magnetic resonance (31P-NMR) in Langendorff rabbit hearts by use of an artificial blood substitute, perfluorochemical emulsion Flusol-43. After normothermic global ischemia of fifteen minutes, postischemic reperfusion of sixty-five minutes was carried out. Methylprednisolone sodium succinate (MPSS) was administered either prior to global ischemia or during postischemic reperfusion. Adenosine triphosphate (ATP), creatine phosphate (CrP), inorganic phosphate (Pi), pH, left ventricular systolic developed pressure (LV DevP) and coronary flow were continuously measured. Thirty-six hearts were divided into three experimental groups consisting of 12 hearts each; CONT consisted of controls, Pre-MPSS perfusion with MPSS-containing solution (10(-4)M) from forty-five minutes prior to global ischemia, and Post-MPSS with the same MPSS solution immediately after postischemic reperfusion. Pre-MPSS showed a significant inhibition of the increase in Pi and of the decrease in ATP and pH during global ischemia, in comparison with the other groups, and a suppression of the overshoot of CrP observed immediately after postischemic reperfusion. LV DevP of Pre-MPSS showed a marked improvement during the postischemic reperfusion as compared with CONT. In Post-MPSS, Pi was significantly increased and ATP decreased during the postischemic reperfusion as compared with the other two groups. There were no differences in coronary flow during postischemic reperfusion among the three groups. In conclusion MPSS has a beneficial effect on metabolism and contractility of the stunned myocardium when it is administered prior to ischemia.
journal_name
Angiologyjournal_title
Angiologyauthors
Kawabata H,Takada K,Katori Rdoi
10.1177/000331979504601004subject
Has Abstractpub_date
1995-10-01 00:00:00pages
895-904issue
10eissn
0003-3197issn
1940-1574journal_volume
46pub_type
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