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Digitalis does not improve left atrial mechanical dysfunction after successful electrical cardioversion of chronic

Wang Yujing1, Huang Congxin, Yang Shaning

  • 1Division of Cardiology, Renmin's Hospital of Wuhan University, Ziyang Road, Wuchang District, Wuhan, 430060, Hubei Province, China.

Cell Biochemistry and Biophysics
|March 31, 2010
PubMed

Insights

Digitalis did not improve left atrial appendage mechanical function after atrial fibrillation cardioversion. This study found no significant benefit of digitalis in restoring function or preventing echo contrast in patients with atrial stunning.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Pharmacology

Background:

  • Atrial stunning, characterized by impaired left atrial appendage (LAA) function, can occur after cardioversion of chronic atrial fibrillation (AF).
  • Understanding interventions to restore LAA mechanical function post-cardioversion is crucial for patient outcomes.

Purpose of the Study:

  • To investigate the efficacy of digitalis in improving the mechanical function of the left atrium and LAA in patients experiencing atrial stunning after cardioversion.
  • To assess whether digitalis can prevent the development of spontaneous echo contrast in the left atrium and LAA.

Main Methods:

  • A randomized controlled trial involving 54 patients with atrial stunning post-cardioversion.
  • Patients were assigned to either a digitalis or control group for one week.
  • Transthoracic echocardiography (TTE) and transesophageal echocardiography (TEE) were used to measure transmitral and LAA flow velocities and LAA ejection fraction at multiple time points.

Main Results:

  • Electrical cardioversion of AF resulted in significantly reduced LAA peak emptying and filling velocities immediately post-procedure in both groups.
  • No significant differences in transmitral flow velocities, LAA flow velocities, or LAA ejection fraction were observed between the digitalis and control groups at 1 day or 1 week post-cardioversion.
  • The incidence of spontaneous echo contrast did not differ significantly between the groups at either follow-up point.

Conclusions:

  • Digitalis administration did not improve the mechanical dysfunction of the left atrium and LAA following cardioversion of chronic AF.
  • Digitalis did not demonstrate a preventative effect on the development of spontaneous echo contrast.
  • Potential mechanisms for digitalis ineffectiveness may involve aggravation of intracellular calcium overload and negative effects on ventricular rate.

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