Caffeine‐induced decreases in the inward rectifier potassium and the inward calcium currents in rat ventricular myocytes

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The effects of high (20 mm) concentrations of caffeine were studied on the transmembrane voltage and currents in rat single ventricular myocytes by the whole cell configuration of the patch clamp technique. Rapid application of caffeine released Ca2+ from the sarcoplasmic reticulum and induced a Ni2+‐sensitive transient inward current with concomitant change of the transmembrane voltage from −72.6 ± 0.4 to −68.0 ± 0.6 mV (n = 4). Maintained application of caffeine lengthened the action potential duration (APD90) from 66.7 ± 16.9 to 135.1 ± 34.1 ms (n = 4) and depressed the amplitude of both the inward rectifier potassium and the inward calcium currents. It is concluded that these effects of caffeine should be recognized when it is used as a tool to study electromechnical coupling. 1993 British Pharmacological Society

Original languageEnglish
Pages (from-to)895-897
Number of pages3
JournalBritish journal of pharmacology
Issue number4
Publication statusPublished - Aug 1993



  • Caffeine
  • calcium current
  • heart
  • potassium current
  • voltage clamp

ASJC Scopus subject areas

  • Pharmacology

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