2.2 Data Collection
Variables retrieved were duration of the cQT (calculated using the Bazzett formula), age, gender, clinical presentation (palpitations, pre-syncope, syncope, seizure or cardiac arrest) and QT prolonging drugs or with known risk of TdP and risk factors contributing to prolonged QT interval as determined by CredibleMeds®[8].
Drugs were grouped according to drug class: antiarrhythmics, antibiotics, antihistamines, antiemetics, antifungal, immunomodulators, opioids, antipsychotics, antidepressants, diuretics, anti-migraine, bronchodilators, hormones, proton-pump inhibitors (PPIs) and others.