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Severe bradycardia associated with crizotinib
  1. Ko Kwan Lung,
  2. Calvin Liu,
  3. Bernard Cheung
  1. Department of Medicine, University of Hong Kong, Queen Mary Hospital, Hong Kong, Hong Kong
  1. Correspondence to Professor Bernard Cheung, Department of Medicine, University of Hong Kong, Queen Mary Hospital, 102 Pokfulam Road, Hong Kong, Hong Kong; mycheung{at}hku.hk

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Crizotinib is a multitarget tyrosine kinase inhibitor used in treating non-small cell lung cancer (NSCLC) with anaplastic lymphoma kinase (ALK) gene mutation. Common and well-known adverse effects include gastrointestinal disturbance, dizziness, fatigue, liver enzyme elevation and visual disturbance. We describe here a patient with NSCLC who presented with symptomatic bradycardia due to crizotinib.

The patient was a 69-year-old Chinese male with stage IV epidermal growth factor receptor-negative, ALK-rearranged NSCLC. He presented to the emergency department complaining of breathlessness, swollen legs and hiccups. He had type 2 diabetes mellitus but no previous cardiovascular disease. He was taking crizotinib 250 mg twice daily, vildagliptin …

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