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Delayed presentation of calcium channel antagonist overdose
Gopikrishna Punukollu1, Ramesh M Gowda, Ijaz A Khan
1Division of Cardiology, Long Island College Hospital, Brooklyn, NY, USA.
American Journal of Therapeutics
|March 12, 2003
Summary
Calcium channel blockers are generally safe, but overdose can cause severe side effects like confusion and hypotension. Even stable patients may develop late adverse events, necessitating prompt medical intervention.
Area of Science:
- Cardiology
- Clinical Pharmacology
Background:
- Calcium channel antagonists (CCAs) are widely used for cardiovascular conditions.
- Therapeutic doses are generally safe, but overdose toxicity is a growing concern.
Observation:
- Severe side effects of CCAs include confusion, lethargy, hypotension, and cardiac conduction abnormalities.
- Long-acting formulations pose a risk of delayed adverse events, even in initially stable patients.
Findings:
- A case of severe diltiazem overdose (1440 mg) illustrates rapid hemodynamic instability despite initial stability.
- Treatment involved intravenous calcium, a temporary pacemaker, inotropic support, and mechanical ventilation, leading to a successful outcome.
Implications:
- This case highlights the critical need for vigilant monitoring and aggressive management of CCA overdose.
- Understanding the pharmacokinetics of long-acting CCAs is crucial for predicting and managing potential toxicity.