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Related Experiment Videos

Thalidomide-induced sinus bradycardia.

Amandeep Kaur1, Susan S Yu, Audrey J Lee

  • 1Thomas J Long School of Pharmacy, University of the Pacific, Stockton, CA, USA.

The Annals of Pharmacotherapy
|July 5, 2003
PubMed
Summary
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Thalidomide can cause sinus bradycardia, a slow heart rate, even at low doses. Elderly patients or those on heart-rate-lowering medications, like atenolol, may be at higher risk for this adverse effect.

Area of Science:

  • Cardiology
  • Pharmacology
  • Hematology

Background:

  • Thalidomide is used to treat conditions like anemia.
  • Sinus bradycardia, a slow heart rate, is a potential adverse effect of thalidomide.
  • Elderly patients and those with comorbidities require careful monitoring.

Observation:

  • A 72-year-old man with refractory anemia experienced significant sinus bradycardia during thalidomide titration.
  • His heart rate dropped from 63 to 44 bpm, with symptoms of dizziness and lightheadedness.
  • Bradycardia symptoms persisted even after discontinuing atenolol, a medication for hypertension.

Findings:

  • Thalidomide discontinuation led to a gradual increase in heart rate, averaging 74 bpm within 3 months.
  • Concurrent use of atenolol may have increased the risk of thalidomide-induced bradycardia.

Related Experiment Videos

  • The causality assessment indicated a probable link between thalidomide and the observed bradycardia.

    • Implications:

    • Thalidomide-induced bradycardia, though rare, is a significant adverse event.
    • Patients with comorbidities or those on heart-rate-lowering drugs need close monitoring for bradycardia.
    • Healthcare providers should be vigilant for signs of bradycardia during thalidomide therapy.