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Related Experiment Videos

Aggravation of postcardioversion atrial dysfunction by sotalol

A Pollak1, R H Falk

  • 1Department of Medicine, Boston University School of Medicine, Massachusetts.

Journal of the American College of Cardiology
|March 1, 1995
PubMed
Summary

Sotalol temporarily worsens atrial function after electrical cardioversion for atrial fibrillation, indicated by reduced A wave velocity. This negative inotropic effect on the atrium may resolve within a month.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Pharmacology

Background:

  • Electrical cardioversion of atrial fibrillation often impairs atrial contractile function, evidenced by a diminished Doppler mitral A wave.
  • Sotalol, an antiarrhythmic drug with Class III and beta-adrenergic blocking properties, may negatively impact atrial function, especially when intrinsic atrial function is compromised post-cardioversion.

Purpose of the Study:

  • To determine the effect of sotalol on atrial function following electrical cardioversion for atrial fibrillation.
  • To investigate whether sotalol exacerbates the impaired atrial function observed after cardioversion.

Main Methods:

  • A randomized, double-blind study involving 37 patients undergoing electrical cardioversion for atrial fibrillation.
  • Quantitative Doppler echocardiography was used to assess mitral inflow variables (E and A waves) within 24 hours and at 1 month post-cardioversion, comparing sotalol and placebo groups.

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Main Results:

  • Sotalol treatment significantly reduced peak A wave velocity and A wave time-velocity integral compared to placebo in the immediate post-cardioversion period.
  • No significant difference was observed in early diastolic filling (E wave variables) between the sotalol and placebo groups.
  • At 1 month, A wave variables improved in both groups, with a more pronounced increase in the sotalol group, suggesting a temporary effect.

Conclusions:

  • Sotalol exerts a negative atrial inotropic effect during the period of prominent atrial stunning after electrical cardioversion.
  • This negative inotropic effect appears to be temporary, with functional recovery observed at 1 month.
  • Clinicians should consider the potential negative inotropic effects of antiarrhythmic drugs like sotalol on atrial function when interpreting Doppler echocardiographic variables of left ventricular filling.