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Changes in coronary flow pattern after intracoronary nitroglycerin. Images of coronary flow obtained at baseline (top panel) and after nitroglycerin (bottom panel). Coronary blood flow (CBF) did not change after nitroglycerin, but acceleration of peak velocity (ACC) and the diastolic to systolic velocity ratio (DSVR) increased. APV, average peak velocity; WSR, wall shear rate.
