Slow supraventricular tachycardia in a patient on β-blocker therapy
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Department of Emergency Medicine, LAC+USC Medical Center, Los Angeles, CA 90033, USA
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Fig. 1
Rhythm strip.
A 77-year-old man presented to the emergency room with a heart rate (HR) of 130 beats per minute and a 2-week history of cough that was worse at night. His current medications included metoprolol for hypertension and, although not a current smoker, he did have a 30-year smoking history. He described no exacerbation with exercise, and his physical examination was negative for jugulovenous distension, calf edema, fevers, wheeze, or neck mass. His chest x-ray was negative. The patient's pulse oximetry was steady at 95%, and his electrocardiogram demonstrated possible left ventricular hypertrophy, a regular rhythm, a PR interval of 148 milliseconds, a QRS interval of 92 milliseconds, and a HR of 130 beats per minute.
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© 2005 Elsevier Inc. Published by Elsevier Inc. All rights reserved.
