Bradycardia during Transradial Cardiac Catheterization due t
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Case:

A 62-year-old male with a history of hypertension, premature coronary artery disease in the family, and severe aortic insufficiency with left ventricular dilation presented with chest heaviness and shortness of breath. He was referred for a coronary angiogram and aortogram to evaluate for coronary artery disease and severe aortic insufficiency, respectively. At the beginning of the procedure, the patient's heart rate (HR) was 60 beats per minute, his blood pressure (BP) was 151/62?mmHg, and his rhythm was consistent with sinus rhythm. A 5 Fr sheath was inserted into his right radial artery. Upon engagement of the ascending aorta with an FL 3.5 catheter prior to the insertion into his left coronary artery, the patient developed sinus bradycardia, with an HR of 39 beats per minute and BP of 117/42?mmHg. Despite treatment with 0.5?mg of intravenous atropine, the patient remained at sinus bradycardia, with an HR of 36 beats per minute and BP of 96/37?mmHg. At this point, the FL 3.5 catheter was removed. The patient's HR improved, and he was recatheterized. The remaining procedure was continued safely without complications.....

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5350482/
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