Answer: Relatively longer QT intervals are acceptable in hospital settings. Although calculated QT interval from EKG machine has become a norm, ideally all patients with suspected acquired Long QT syndrome (LQTS) should have a QT interval measured manually on all available EKGs including the old ones. Leads II and V5 are preferred. This measurement should be corrected for the heart rate (QTc).
The American Heart Association/American College of Cardiology (AHA/ACC) scientific statement on prevention of Torsades de Pointes (TdP) recommended the following limits for QTc in hospital settings
- >470 milliseconds for men, and
- >480 milliseconds for women
#cardiology
Reference:
Drew BJ, Ackerman MJ, Funk M, et al. Prevention of torsade de pointes in hospital settings: a scientific statement from the American Heart Association and the American College of Cardiology Foundation. Circulation 2010; 121:1047.
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