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The Journal of Thoracic and Cardiovascular Surgery, Vol 78, 893-907, Copyright © 1979 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association
JW Standeven, M Jellinek, LJ Menz, JW Hahn and HB Barner
Potassium (34 mEq/L) cardioplegia was induced with cold blood (CBK) in
three groups of six dogs undergoing 60 minutes of myocardial ischemia at a
systemic temperature of 27 degrees +/- 2 degrees and a myocardial
temperature of 7 degrees +/- 2 degrees C (crushed ice). Group 1 (CBK)
animals were reperfused initially with 400 ml cold blood over 8 to 10
minutes at increasing pressures of up to 75 mm Hg. Group II (CBK-K) dogs
were reperfused in the same manner as Group I with the addition of
potassium chloride, 30 mEq/L. In Group III (CBKG-KG) glutathione, 30 mg/100
ml, was added to both the pre- and postischemic perfusions with CBK. After
30 minutes of reperfusion control studies were repeated. Heart rate, peak
systolic pressure, rate of rise of left ventricular pressure, maximum
velocity of contractile element, pressure-volume curves, coronary flow
distribution, muscle stiffness, and heart water were not significantly
different from control values. Total coronary flow and myocardial uptake of
oxygen, lactate, and pyruvate did not serve to separate the three groups;
the same was true for right ventricular creatine phosphate, adenosine
triphosphate, and adenosine diphosphate during ischemia and recovery.
Ultrastructural myofibrillar lesions were noted in all groups. thus,
postischemic cardioplegia and use of a physiological reducing agent do not
enhance CBK cardioplegia with topical and systemic hypothermia.
ARTICLES
Cold-blood potassium cardioplegia: evaluation of glutathione and postischemic cardioplegia
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