UC Davis

BACKGROUND: Patients presenting to the emergency department with recent palpitations are a diagnostic challenge when the arrhythmia and its symptoms have resolved prior to arrival. Newer smart watch technology, adept at detecting atrial fibrillation, can assist in the diagnostic evaluation of transitory palpitations. We report a case of cold drink-triggered atrial fibrillation whose diagnosis would not have been possible without the assistance of the patients smart watch. CASE PRESENTATION: A middle-aged man without cardiac history developed sudden rapid, irregular palpitations with shortness of breath while drinking a glass of cold juice. He activated his smart watch with 1-lead electrocardiography technology which detected rapid atrial fibrillation. He sought medical care, but while waiting, his symptoms-then 90 min in duration-spontaneously resolved. His initial diagnostic evaluation documented only sinus rhythm, as did several follow-up evaluations with cardiology the next several weeks. Had it not been for his smart watch, the etiology of his transitory palpitations would have remained undiagnosed. His physicians encouraged trigger avoidance. In the following months, he avoided rapid ingestion of cold drink, taking instead small sips. The atrial fibrillation has not recurred. CONCLUSIONS: The case illustrates the valuable contribution of smart watch technology in the diagnostic evaluation of patients with short-lived palpitations. The case also educates clinicians about cold drink and food as a trigger of paroxysmal atrial fibrillation. This trigger, like alcohol, can be modified. Cold drink trigger avoidance has been reported by patients to reduce atrial fibrillation recurrence and is a low-risk, cost-effective strategy that is often successful.