Related Experiment Videos
Summary
Oral disopyramide effectively controlled cardiac arrhythmias in patients with heart disease. Therapeutic serum levels were established, with side effects noted at higher concentrations but generally not clinically troublesome.
Area of Science:
- Cardiology
- Clinical Pharmacology
Background:
- Cardiac arrhythmias are a significant concern in patients with coronary or hypertensive heart disease.
- Management of persistent arrhythmias often requires pharmacological intervention.
Purpose of the Study:
- To investigate the relationship between serum disopyramide levels and arrhythmia control.
- To determine effective and safe serum concentrations of oral disopyramide for treating cardiac arrhythmias.
Main Methods:
- 16 patients with stable cardiac arrhythmias received oral disopyramide (100 mg) every 6 or 8 hours.
- Serum disopyramide levels were measured by gas chromatography at the time of arrhythmia conversion.
- Arrhythmia control and adverse effects were monitored.
Main Results:
- Overall arrhythmia control was achieved in 82% of patients within 24 hours.
- Effective serum levels ranged from 2.80-3.18 µg/mL for atrial and 3.27-7.48 µg/mL for ventricular arrhythmias.
- Mean effective level was 3.69 µg/mL; mean ineffective level was 2.39 µg/mL (p<0.01).
- Side effects occurred at higher levels (mean 5.54 µg/mL) but were not clinically troublesome.
Conclusions:
- Disopyramide is effective and safe for treating cardiac arrhythmias at serum levels between 2.39 and 3.60 µg/mL.
- A dosage of 100 mg every 8 hours can maintain therapeutic levels.
- Caution is advised in patients with severe heart disease, low blood pressure, or abnormal ECGs.