title: A case of atrial tachycardia sensitive to increased caffeine intake.
abstract: A 33-year-old Japanese man with atrial tachycardia visited our clinic. He regularly consumed daily alcohol with cola, one cup of regular coffee, and a candy containing 0.7 mg of caffeine per tablet. After stopping his caffeine intake, his arrhythmia ameliorated. Since caffeine might be associated with his arrhythmia, a caffeine load test (equivalent to his daily intake of caffeine) was performed for 4 days. Atrial tachycardia time from a Holter recording was 44.2 minute/day before the caffeine load, compared with 215.2 minute/day during the caffeine load. Plasma caffeine concentration before and during caffeine loading was 3.1 mg/dL and 5.4 mg/dL, respectively. Caffeine use seemed to be an important factor for his atrial tachycardia, since his arrhythmia became worse during caffeine load testing and was ameliorated after the cessation of caffeine.
authors.affiliation: Kinugawa Cardiology Clinic, Osaka, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Kinugawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Kurita
authors.forename: Ryuji
authors.initials: R
authors.lastname: Nohara
authors.forename: Michael L
authors.initials: ML
authors.lastname: Smith
mesh_terms: D000328:Adult; D002110:Caffeine / Q000008:administration & dosage / Q000009:adverse effects*; D000697:Central Nervous System Stimulants / Q000008:administration & dosage; D003069:Coffee / Q000009:adverse effects; D018450:Disease Progression; D015716:Electrocardiography, Ambulatory / Q000187:drug effects*; D005500:Follow-Up Studies; D006339:Heart Rate / Q000187:drug effects*; D006801:Humans; D008297:Male; D013612:Tachycardia, Ectopic Atrial / Q000175:diagnosis / Q000503:physiopathology*; D013662:Tea / Q000009:adverse effects
chemical_list: D000697:Central Nervous System Stimulants; D003069:Coffee; D013662:Tea; D002110:Caffeine