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Patient
64-year-old man, with coronary disease, hypertensive, treated by beta-blocker, with lung neoplasia; electrocardiogram recorded before the start of chemotherapy;
Trace
Sinus rhythm with sinus bradycardia (51 bpm) under beta-blocker; PR measurement of 180 ms; relatively short QT-interval (350 ms) with slight elevation of the J point in V1, V2; the biological work-up revealed a moderate hypercalcemia;
Exergue
A QT-interval can be considered short when its duration is less than 350 ms, a value less than 300 ms being clearly pathological and strongly evocative of a metabolic disorder and, exceptionally, of a congenital short QT syndrome.
A QT-interval is defined as short if it is less than 350 or 320 ms (depending on the definitions). There appears to be an increased risk of syncope and sudden death when the QT-interval is less than 300 ms.
A pattern of short QT can be observed in various clinical situations: