Experientia

, Volume 43, Issue 11–12, pp 1162–1168 | Cite as

Sodium channels in cardiac Purkinje cells

  • H. A. Fozzard
  • D. A. Hanck
  • J. C. Makielski
  • B. E. Scanley
  • M. F. Sheets
Article

Summary

Sodium (Na+) currents are responsible for excitation and conduction in most cardiac cells, but their study has been hampered by the lack of a satisfactory method for voltage clamp. We report a new method for low resistance access to single freshly isolated canine cardiac Purkinje cells that permits good control of voltage and intracellular ionic solutions. The series resistance was usually less than 3Ω cm2, similar to that of the squid giant axon. Cardiac Na+ currents resemble those of nerve. However, Na+ current decay is multiexponential. The basis for this was further studied with cell-attached patch clamp recording of single Na+ channel properties. A prominent characteristic of the single channels was their ability to reopen after closure. There was also a long opening state that may be the basis for a small very slowly decaying Na+ current. This rare long opening state may contribute to the Na+ current during the action potential plateau.

Key words

Cardiac Purkinje cells Na+ channels voltage clamp single channel recording 

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Copyright information

© Birkhäuser Verlag 1987

Authors and Affiliations

  • H. A. Fozzard
    • 1
  • D. A. Hanck
    • 1
  • J. C. Makielski
    • 1
  • B. E. Scanley
    • 1
  • M. F. Sheets
    • 1
  1. 1.Cardiac Electrophysiology Labs, Departments of Medicine and the Pharmacological & Physiological SciencesThe University of ChicagoChicagoUSA

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