Electromechanical dissociation after ventricular fibrillation: prevention with calcium-entry blockers.

Abstract:

:Calcium-entry blockers were administered in an attempt to protect myocardium during cardiac arrest due to ventricular fibrillation in mechanically ventilated dogs. An intravenous injection of verapamil, nifedipine, or lidoflazine was administered prior to successively prolonged episodes of ventricular fibrillation, during which no thoracic compression was performed. It is of interest that ventricular defibrillation was more easily obtained after treatment with the three drugs. As previously observed in this model, nine control dogs developed electromechanical dissociation (EMD) after 120 seconds of ventricular fibrillation. In contrast, six of the 11 dogs treated with 0.3 mg/kg of verapamil recovered mechanical systole after 120 seconds of ventricular fibrillation (p less than 0.05). Nifedipine administration also postponed the onset of EMD in three of four dogs. However, lidoflazine postponed the onset of EMD in only one of the eight dogs. The later onset of EMD after administration of verapamil or nifedipine in this model was attributed to myocardial protection by calcium-entry blockers during ventricular fibrillation. Decreased energy utilization during cardiac arrest was considered to be the principal protective mechanism. These observations indicate calcium-entry blockers, and especially verapamil and nifedipine, can be valuable drugs during cardiac resuscitation for ventricular fibrillation.

journal_name

J Cardiovasc Pharmacol

authors

Vincent JL,Goldstein J,Dufaye P,Domb M

subject

Has Abstract

pub_date

1984-11-01 00:00:00

pages

1124-31

issue

6

eissn

0160-2446

issn

1533-4023

journal_volume

6

pub_type

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