Question: What percentage of drug-induced cases of torsade de pointes are associated with previously unrecognized long QT syndrome?
Answer: The cited reference notes “………..previously unrecognized long QT syndrome, of any subtype, can be identified in 5 to 20% of patients with drug induced torsade de pointes.” (Roden DM. Long-QT Syndrome. 2008 NEJM 358:169-176)
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