Recognition
- • QTc >450 ms (men), >470 ms (women); high risk >500 ms
- • Use Bazett: QT/√RR
Key findings
- • Macrolide/quinolone/methadone/antipsychotic association
- • Notched / broad T
Clinical importance
- • Risk of torsades de pointes / sudden cardiac death
Management pearls
- • Stop QT-prolonging drugs
- • Correct K⁺ ≥4.5, Mg ≥1.0
- • Magnesium 2 g IV for torsades
- • β-blocker / pacing / ICD for congenital LQTS
Related in WardRound
