* Ddx includes cardiac arrhythmias ('''VT after MI or iso cardiomyopathy occurs without warning symptoms'''), vasovagal, seizures, orthostatic hypotension, SAH, vertigo, symptomatic anemia
=Missed Concepts=
=Missed Concepts=
*'''Verapamil inhibits renal tubular secretion of digoxin, leading to toxicity'''
*'''Verapamil inhibits renal tubular secretion of digoxin, leading to toxicity'''
*6-minute walk test and cardiopulmonary exercise testing are useful tests for risk assessment prior to '''cardiac or pulmonary surgery.'''
*6-minute walk test and cardiopulmonary exercise testing are useful tests for risk assessment prior to '''cardiac or pulmonary surgery.'''