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Related Experiment Videos

Changes in atrioventricular conduction properties with refractory-period modulation

K W Hewett1, F K Le, K L Martin

  • 1South Carolina Children's Heart Center, Medical University of South Carolina, Charleston 29425, USA.

Journal of Cardiovascular Pharmacology
|December 1, 1996
PubMed
Summary
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Dofetilide, clofilium, and risotilide prolong cardiac refractory periods. Clofilium showed less rate dependency, potentially making it more effective for preventing AV nodal reentrant tachycardias than dofetilide or risotilide.

Area of Science:

  • Cardiovascular Pharmacology
  • Electrophysiology

Background:

  • Dofetilide, clofilium, and risotilide are known to prolong cardiac action potentials and refractory periods.
  • Understanding their effects on atrioventricular (AV) conduction is crucial for managing cardiac arrhythmias.

Purpose of the Study:

  • To investigate the rate-related effects of dofetilide, clofilium, and risotilide on AV conduction in an isolated rabbit heart model.
  • To compare the efficacy of these drugs in potentially preventing AV nodal reentrant tachycardias based on their rate dependency.

Main Methods:

  • Utilized a perfused isolated rabbit heart preparation.
  • Employed intermittent premature pacing and bipolar surface electrograms to assess electrophysiological parameters.
  • Tested drug effects at two basic cycle lengths (BCL): 400 ms and 250 ms.

Related Experiment Videos

Main Results:

  • All three drugs increased refractory periods concentration-dependently in the AV axis.
  • Dofetilide and risotilide did not affect maximal atrio-His (AH) conduction interval at the shorter BCL (250 ms).
  • Clofilium reduced AH conduction and its variability at both BCLs, suggesting less rate dependency.

Conclusions:

  • Sufficient prolongation of atrial or nodal refractory periods can decrease AHmax at longer BCLs.
  • Dofetilide and risotilide may be less effective than clofilium in preventing AV nodal reentrant tachycardias due to their rate-dependent effects.