2.1 Study design and Patient selection
We performed a retrospective study of consecutive patients admitted to
the emergency department of a tertiary hospital between the
28th of January and 17th of March
2020. Only patients with an electrocardiogram (ECG) were included.
Exclusion criteria were normal corrected QT interval (cQT) (lower than
470ms in men and 480ms in women as defined by the American Society of
Cardiology), repeated ECGs following ER admissions, bad
electrocardiographic quality, congenital LQTS, atrial fibrillation
(AF)/arrhythmias and pacemaker rhythm.