Characterization of cocaine-induced block of cardiac sodium channels.

  title={Characterization of cocaine-induced block of cardiac sodium channels.},
  author={William J. Crumb and Craig W. Clarkson},
  journal={Biophysical journal},
  volume={57 3},
Recent evidence suggests that cocaine can produce marked cardiac arrhythmias and sudden death. A possible mechanism for this effect is slowing of impulse conduction due to block of cardiac Na channels. We therefore investigated its effects on Na channels in isolated guinea pig ventricular myocytes using the whole-cell variant of the patch clamp technique. Cocaine (10-50 microM) was found to reduce Na current in a use-dependent manner. The time course for block development and recovery were… CONTINUE READING

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