A case of atrial tachycardia sensitive to increased caffeine intake

Toru Kinugawa, Takashi Kurita, Ryuji Nohara, Michael L. Smith

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


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.

Original languageEnglish
Pages (from-to)398-400
Number of pages3
JournalInternational Heart Journal
Issue number6
StatePublished - 2011


  • Atrial tachycardia
  • Caffeine
  • Caffeine load test
  • Holter monitoring


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