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QT interval prolongation and torsade de pointes associated with indapamide
International Journal of Cardiology
|November 2, 2005
Summary
Indapamide can prolong the QT interval, increasing the risk of dangerous heart rhythms. This case highlights the potential cardiac risks associated with indapamide, especially in patients with cardiovascular conditions.
Area of Science:
- Pharmacology
- Cardiology
- Electrophysiology
Background:
- Drug-induced QT interval prolongation is primarily caused by blockade of the delayed rectifier repolarizing potassium current.
- Indapamide is recognized for blocking the slow component of this current, leading to prolonged cardiac repolarization.
Observation:
- A case report details a woman with systemic lupus erythematosus and hypertension.
- She was concurrently treated with prednisolone and indapamide.
Findings:
- The patient developed acquired long QT interval and torsade de pointes ventricular tachycardia.
- This suggests a link between indapamide use and significant cardiac repolarization abnormalities.
Implications:
- This case underscores the importance of monitoring cardiac repolarization in patients using indapamide.
- Awareness of potential drug-induced arrhythmias is crucial for patient safety, particularly in those with pre-existing conditions.