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Polymorphic Ventricular Tachycardia Associated with High-Dose Methadone Use
Weng-Chio Tam1, U-Po Lam1, Toi-Meng Mok1
1Department of Cardiology, Centro Hospitalar Conde São Januário, Macau, SAR, China.
Case Reports in Cardiology
|October 8, 2020
Summary
High-dose methadone can cause dangerous heart rhythm problems like torsade de pointes. Periodic QT interval monitoring is crucial for patients on methadone to prevent fatal cardiac events.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Methadone is widely used for pain management and opioid addiction treatment.
- While generally safe, methadone carries risks of cardiac side effects, including arrhythmias.
Observation:
- A case study involving a middle-aged woman on high-dose methadone presented with QT prolongation and torsade de pointes.
- The patient's condition was successfully managed by switching to benzodiazepine and administering lidocaine.
Findings:
- Methadone can induce torsade de pointes, a rare but life-threatening cardiac event.
- Prompt intervention, including medication adjustment and supportive care, can normalize the QT interval.
Implications:
- Clinicians should be vigilant for cardiac side effects in patients receiving methadone, particularly at high doses.
- Regular electrocardiogram (ECG) monitoring is recommended to detect QT prolongation and prevent adverse cardiac outcomes.
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