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[Pindolol in intraoperatively developing isorhythmic AV dissociation].

D Knüttgen1, M Doehn

  • 1Abteilung für Anaesthesiologie, Städtische Krankenanstalten Köln-Merheim.

Der Anaesthesist
|August 1, 1987
PubMed
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Pindolol effectively converts isorhythmic AV dissociation (nodal rhythm) to normal sinus rhythm during anesthesia. This beta-blocker demonstrated a significant restoration rate, particularly at higher doses.

Area of Science:

  • Anesthesiology
  • Cardiology
  • Pharmacology

Background:

  • The mechanism of isorhythmic AV dissociation (ID), or nodal rhythm, during anesthesia is not fully understood.
  • Elevated sympathetic tone and sinus node blockade are proposed causes of ID.

Purpose of the Study:

  • To investigate the efficacy of the beta-blocker pindolol in converting ID to normal sinus rhythm.
  • To determine the optimal dose of pindolol for this conversion.

Main Methods:

  • A prospective, randomized study involving 40 patients who developed ID during elective surgery.
  • Patients were randomized into four groups: a control group and three groups receiving different intravenous doses of pindolol (0.5, 1.0, 2.0 µg/kg).
  • Restoration of sinus rhythm was monitored for 15 minutes post-administration.

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Main Results:

  • Spontaneous return to sinus rhythm occurred in 20% of the control group.
  • Pindolol restored sinus rhythm in 83.3% of treated patients (p < 0.001).
  • The highest dose of pindolol (2.0 µg/kg) was the most effective.

Conclusions:

  • Pindolol is a highly effective treatment for isorhythmic AV dissociation during anesthesia.
  • The study supports the use of beta-blockers for managing this specific arrhythmia in surgical patients.