Congenital long QT syndrome (LQTS) is a rare genetic disorder characterized by prolongation of the corrected QT interval (QTc) on the electrocardiogram. LQTS is associated with a risk of syncope or sudden death from ventricular arrhythmia. The increase in the duration of the corrected QT interval and / or changes in the morphology of the T wave on the electrocardiogram are markers of an increased risk of sudden death and syncope. Recently, a personal portable 6-lead device (DI, DII, DIII, aVF, aVL and aVR) connected to the patient's smartphone has entered the market (KARDIA MOBILE 6L, AliveCor, Mountain View, CALIFORNIA, USA). The APPLE WATCH Series 6 (Apple, Cupertino, CA, USA) can also record an ECG. If the device is designed to record a single lead (DI), several works have shown that it is possible to record 9 leads (DI, DII, DIII, V1, V2, V3, V4, V5 and V6) by moving simply the device (Spaccarotella CAS et al. JAMA Cardiology 2020). These devices were originally designed to screen for atrial fibrillation, but they produce accurate 6- and 9-lead ECGs and could potentially allow ambulatory ECG monitoring of patients with LQTS.
Study Type
OBSERVATIONAL
Enrollment
111
Patients with LQT syndrome diagnosis.
Chevalier
Bron, France
the duration of the QTc (ms)
The primary outcome is the measurement of 3 data: \- the duration of the QTc (ms). These data will be measured during the same inclusion visit with 1/ the standard 12-lead ECG machine, 2/ the KARDIA MOBILE 6L and 3/the APPLE WATCH Series 6. The data of the Kardia Mobile 6L and the Apple Watch series 6 will be compared to the data of the gold standard a 12-lead ECG.
Time frame: at the inclusion visit
the morphology of the T waves (bpm).
\- the morphology of the T waves (bpm). These data will be measured during the same inclusion visit with 1/ the standard 12-lead ECG machine, 2/ the KARDIA MOBILE 6L and 3/the APPLE WATCH Series 6. The data of the Kardia Mobile 6L and the Apple Watch series 6 will be compared to the data of the gold standard a 12-lead ECG.
Time frame: at the inclusion visit
the heart rate (bpm).
\- the heart rate (bpm). These data will be measured during the same inclusion visit with 1/ the standard 12-lead ECG machine, 2/ the KARDIA MOBILE 6L and 3/the APPLE WATCH Series 6. The data of the Kardia Mobile 6L and the Apple Watch series 6 will be compared to the data of the gold standard a 12-lead ECG.
Time frame: at the inclusion visit
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