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QT interval prolongation associated with venlafaxine administration
International Journal of Cardiology
|April 1, 2006
Summary
Venlafaxine, an antidepressant, can prolong the QT interval, increasing the risk of dangerous heart rhythms. Discontinuation of this drug led to normalization of the QT interval in a patient, suggesting a causal link.
Area of Science:
- Cardiology
- Pharmacology
- Psychiatry
Background:
- Non-antiarrhythmic medications, particularly psychotropic agents, are known to prolong cardiac repolarization.
- This prolongation elevates the risk of potentially fatal arrhythmias like Torsade de Pointes ventricular tachycardia.
Observation:
- A 60-year-old woman presented with hypertension and dyspnea.
- She exhibited a significantly prolonged QT interval (QTc: 582 ms).
- The patient had a history of depression treated with venlafaxine.
Findings:
- The prolonged QT interval normalized shortly after venlafaxine cessation.
- This case represents the first documented instance of venlafaxine-induced QT interval prolongation.
Implications:
- Clinicians should be aware of the potential for venlafaxine to cause QT prolongation.
- Monitoring cardiac repolarization is crucial in patients treated with venlafaxine, especially those with risk factors.
- This finding highlights the importance of considering drug-induced effects in cardiac events.