Current thresholds and liminal size in excitation of heart muscle.

  title={Current thresholds and liminal size in excitation of heart muscle.},
  author={Fred W. Lindemans and J J Denier van der Gon},
  journal={Cardiovascular research},
  volume={12 8},
End-diastolic current thresholds have been measured in 12 open-chested dogs with epicardial disc electrodes ranging in radius from 0.01 to 9.0 mm. The current threshold for cathodal 1 ms impulses proved to be independent of electrode size for radii smaller than 0.2 mm and proportional to the radius to the power 1.5 for radii greater than 0.4 mm. This relationship can be explained on the assumption that excitation occurs if the current passing through a 'liminal area' with dimensions of about 0… CONTINUE READING
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