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Figure 5 | Cardiovascular Ultrasound

Figure 5

From: Diastolic time – frequency relation in the stress echo lab: filling timing and flow at different heart rates

Figure 5

Dipyridamole stress echo (0.84 mg/kg in 6', accelerated protocol). Systolic (pink lines) and diastolic (black lines) times as a function of HR. Dipyridamole results in adenosine receptor-mediated systemic as well coronary vasodilatation, often accompanied by a reflex increase in heart rate. With moderate stress induced HR increase (up to 110–100 bpm, upper and middle panel) diastolic time critically shortens, equalling systolic time. With mild induced HR increase (up to 70 bpm, lower panel) diastole has longer duration.

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