HRS Board Review 2025 New Courses (Reviewers Copy)-Workshop 1_Tomaselli_2025

Workshop 1_Tomaselli_2025_case 7

Video Transcription

Video Summary

A 51-year-old woman with a history of hypertension and substance use disorder presents with syncope. Her medications include hydrochlorothiazide, nifedipine, and methadone. Labs show low potassium (3.3 mEq/L) and normal magnesium levels. An echocardiogram reveals left ventricular hypertrophy and normal ejection fraction. After admission, an ECG is taken. The potential causes for her arrhythmia are evaluated: ischemia from cocaine use, decreased repolarization due to ventricular hypertrophy, hypokalemia from hydrochlorothiazide, drug-induced QT prolongation, or hypokalemia with a genetic mutation.

Keywords

syncope

hypokalemia

ventricular hypertrophy

arrhythmia

QT prolongation