ECG Quiz: Dizziness in a Cardiac Rehabilitation Patient.

A 62-year-old woman entered a cardiac rehabilitation program for help with weight loss and fitness, and also for monitoring of episodic atrial fibrillation, which had begun in 1992. She was able to exercise without triggering atrial fibrillation. Additional past medical problems included glucose intolerance (treated with diet), hyperlipidemia, hypertension, migraine headaches, degenerative disease of the spine, and a duodenal ulcer.