Effect of Graded Coronary Constriction on the Flow Reserve in Regional Myocardium in Dog

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  • HARAOKA Shoichi
    Central Laboratory and First Department of Internal Medicine, Okayama University Medical School
  • SAITO Daiji
    Central Laboratory and First Department of Internal Medicine, Okayama University Medical School
  • KUSACHI Shozo
    Central Laboratory and First Department of Internal Medicine, Okayama University Medical School
  • SOGO Taiji
    Central Laboratory and First Department of Internal Medicine, Okayama University Medical School
  • YAMADA Nobuyuki
    Central Laboratory and First Department of Internal Medicine, Okayama University Medical School
  • NISHIYAMA Osamu
    Central Laboratory and First Department of Internal Medicine, Okayama University Medical School
  • YASUHARA Koichiro
    Central Laboratory and First Department of Internal Medicine, Okayama University Medical School

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  • Effect of Graded Coronary Constriction

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Effects of coronary constriction on the flow reserve of regional myocardium were studied in the anesthetized open-chest dogs. Regional mycocardial-blood flow (RMBF) was continuously measured using heated crossthermocouple method. Left circumflex coronary artery (LCX) was constricted gradually with a screw type constrictor. The coronary constriction decreased subendocardial myocardial blood flow, while subepicardial myocardial blood flow was not affected until reactive hyperemia in LCX nearly disappeared. Recovery and arrival to peak flow rate of RMBF following the release of 15-second's occlusion of LCX were progressively delayed with an increase in the constriction, especially in the subendocardial myocardium. Repayment of flow debt, however, was remained relatively well since the duration of reactive hyperemia in RMBF was prolonged by an increment of the constriction.<br>From these findings, it might be concluded that in the heart with coronary stenosis recovery from ischemia was caused by prolonged duration of reactive hyperemia, and is suggested that the time required for recovery from ischemia or isehemic abnormalities after the cessasion of stress might be an important marker for the severity of coronary insufficiency.

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