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. 1993 Feb;69(2):114–120. doi: 10.1136/hrt.69.2.114

Free radical activity and left ventricular function after thrombolysis for acute infarction.

S W Davies 1, K Ranjadayalan 1, D G Wickens 1, T L Dormandy 1, V Umachandran 1, A D Timmis 1
PMCID: PMC1024936  PMID: 8435235

Abstract

BACKGROUND--Experimental data suggest that reperfusion injury involving free radicals contributes to the impairment of left ventricular function after successful thrombolysis. METHODS--In 72 patients presenting with acute myocardial infarction, markers of free radical activity were measured before streptokinase and two hours later. Thiobarbituric acid reactive material (TBA-RM) reflects lipid peroxidation by free radicals, and the concentration of plasma total thiols (34 patients) reflects oxidative stress. Coronary arteriography was performed at 18-72 hours after thrombolysis to determine coronary patency, and left ventricular function was assessed by ventriculography and from QRS scoring of the electrocardiogram. RESULTS--The infarct related artery was patent (Thrombolysis In Myocardial Infarction Trial grade 2 or better) in 60 (83%) and occluded in 12. In the 60 with a patent artery, the concentration of TBA-RM increased after streptokinase by (mean (SD)) 9.2 (14.0) nmol/g albumin, whereas in the 12 with an occluded artery TBA-RM decreased by 7.0 (11.3) nmol/g albumin (p < 0.01 between groups). In those with a patent artery the rise in TBA-RM associated with thrombolysis correlated with left ventricular ejection fraction (R = -0.41, p < 0.002), and with the QRS score (R = +0.38, p = 0.003). Plasma total thiol concentrations decreased by 12.7 (31.1) mumol/l in those with a patent artery, and this decrease associated with thrombolysis correlated with left ventricular ejection fraction (R = +0.39, p < 0.02) but not with the QRS score (R = -0.2, NS). CONCLUSIONS--These findings suggest that reperfusion injury mediated by free radicals may be of clinical importance in humans.

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Selected References

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