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Example of a response produced by of MB (4 mg/kg) during H2S-induced coma. End-systolic and end-diastolic diameters were determined by echocardiography are shown. Note the decrease in contractility and heart rate produced by H2S (A), 3 min after the intraperitoneal injection of H2S, which was improved by an acute injection of MB (4 mg/kg) (B).
