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Figure 5 Effect of intrapericardial nitroglycerin on the rise in contractility in response to intracoronary bolus injections of dobutamine. At 15 min after intrapericardial nitroglycerin, the rise in contractility induced by intracoronary dobutamine was significantly blunted (*p < 0.05). Thereafter, nitroglycerin’s effect did not achieve statistical significance. LV dP/dt max = maximum of the first time derivative of left ventricular pressure.