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The effects of exogenous histamine in isolated rat hearts

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Abstract

The role of histamine in cardiac physiology and pathophysiology is not clarified, but is dependent on species. The effects of exogenous histamine in Langendorff-perfused rat hearts were investigated. 1 mM, 100, 10, 1 and 0.1 μM of histamine (n=7 each) as 15 min infusions were employed in a dose-response study, and compared to control perfused hearts (n=7). In another experimental series, 100 μM histamine (n=15) was added during reperfusion after 25 min global ischemia, and compared to control ischemia-reperfusion (n=15). The maximal response to histamine in the dose-response study (100 μM) was an increase of left ventricular developed pressure to 126±8% of initial value (mean±SEM, p<0.04), and increase of coronary flow to 152+6% (p<0.02) after 5 min infusion. 100 μM histamine did not significantly influence heart rate or rhythm. The lowest concentration (0.1 μM) did not have effects cardiac performance. Reperfusion with histamine for 2 min after ischemia reduced left ventricular developed pressure to 68±10% of initial value versus 116+17% in ischemic controls (p<0.05), and increased left ventricular end-diastolic pressure to 24±8 mmHg compared to 6±2 mmHg in controls (p<0.04). Left ventricular pressures were similar in hearts reperfused with histamine and in ischemic controls for the rest of the observation. Coronary flow increased during reperfusion in hearts given histamine. Histamine had a dose-dependent positive inotropic and vasodilatory effect in isolated rat hearts. Exogenous histamine had only minor effects on post-ischemic cardiac function.

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Valen, G., Skjelbakken, T. & Vaage, J. The effects of exogenous histamine in isolated rat hearts. Mol Cell Biochem 146, 55–61 (1995). https://doi.org/10.1007/BF00926882

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