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Immediate effects of intravenous verapamil in cardiac arrhythmias
Insights
Verapamil effectively treated various cardiac arrhythmias by slowing heart rate and converting irregular rhythms to normal sinus rhythm. This intravenous treatment showed consistent efficacy with no reported adverse clinical side effects in patients.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Cardiac arrhythmias are a significant cause of morbidity and mortality.
- Effective pharmacological interventions are crucial for managing diverse heart rhythm disorders.
Purpose of the Study:
- To evaluate the efficacy and safety of intravenous verapamil in patients with various cardiac arrhythmias.
- To assess verapamil's impact on pacemaker automaticity and rhythm regularity.
Main Methods:
- Intravenous verapamil administration to 181 patients diagnosed with cardiac arrhythmias.
- Observation and recording of electrophysiological effects on cardiac rhythm and patient response.
Main Results:
- Verapamil consistently converted paroxysmal supraventricular tachycardia to sinus rhythm.
- The drug slowed the ventricular response in atrial fibrillation and atrial flutter, often restoring sinus rhythm.
- Automaticity of cardiac pacemakers was reduced in sinus, idionodal, and idioventricular tachycardias.
- Favorable responses were noted in arrhythmias associated with pre-excitation syndromes.
- No adverse clinical side effects were reported during the study.
Conclusions:
- Intravenous verapamil is a safe and effective treatment for a range of cardiac arrhythmias.
- Verapamil demonstrates consistent efficacy in rhythm conversion and rate control for supraventricular and atrial arrhythmias.
- The drug is well-tolerated, offering a favorable safety profile for acute arrhythmia management.
Abstract:
Verapamil was administered by intravenous injection to 181 patients with various cardiac arrhythmias. The automaticity of the cardiac pacemaker was slowed in sinus, idionodal, and idioventricular tachycardia. In atrial fibrillation the drug usually slowed the ventricular response and often made it regular. In some cases atrial flutter was converted to sinus rhythm, the ventricular response being reduced in the remainder. Conversion of paroxysmal supraventricular tachycardia to sinus rhythm was consistently achieved. A favourable response occurred in four patients in whom arrhythmias were associated with pre-excitation syndromes. There were no adverse clinical side effects.