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We studied the hemodynamic side effects of intracoronary injection of contrast media during acute ischemic heart failure by using anesthetized dogs. Induction of failure was performed by microembolization of the area supplied by the left main coronary artery. Six ml of iohexol (Omnipaque) increased contractility during the normal state, while this contrast medium induced no alterations in any of the recorded hemodynamic variables during left ventricular failure. Ioxaglate (Hexabrix) was also well tolerated during the normal state, while sodium-meglumine diatrizoate (Renografin) markedly decreased systolic variables. However, in the failing heart both ioxaglate and diatrizoate resulted in greater reduction in all systolic variables than in the normal heart. We conclude that both ionic contrast media may be harmful in acute ischemic heart failure. Non-ionic iohexol appears safer in this condition.
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