Paradoxical sinus deceleration during dobutamine stress echocardiography: case series and review of the literature

Background Dobutamine stress echocardiography is an established diagnostic modality for assessing myocardial ischaemia in patients with known or suspected coronary artery disease. Dobutamine infusion causes dose-dependent increase in heart rate and contractility. However, in some cases, it induces paradoxical sinus deceleration, whose underlying mechanism and clinical significance are not fully understood. Case summary We present episodes of paradoxical sinus deceleration observed during dobutamine stress echocardiography in six (four males and two females) patients and described its patterns of occurrence and clinical and echocardiographic characteristics. Discussion Paradoxical sinus deceleration occurred mostly at maximal dobutamine infusion was accompanied with a decline in blood pressure and resolved spontaneously following cessation of dobutamine infusion. Individuals experiencing paradoxical sinus deceleration had in common abnormal left ventricle geometry but differed with regard to age, sex, and cardiometabolic risk factors.

Automated summary

This study reported paradoxical sinus deceleration observed during dobutamine stress echocardiography in six patients and described its occurrence patterns and clinical characteristics. The deceleration mainly occurred at maximal dobutamine infusion, accompanied by a decrease in blood pressure and resolved spontaneously after cessation of dobutamine infusion. Patients experiencing paradoxical sinus deceleration commonly had abnormal left ventricle geometry but differed in terms of age, sex, and cardiometabolic risk factors.