| V | Polymorphic ventricular tachycardia (≥3 beats at rate >100 min−1) or ventricular fibrillation, documented by an ECG recording or statement in the case record |
| S | Syncope recorded in case notes, and polymorphic ventricular premature contractions documented by an ECG recording in the case record |
| Q | ECG recording during admission showing Fridericia rate-corrected QT interval (QT/RR1/3) >440 ms in men or >450 ms in women. |
| D | Exposure (within an interval short enough for the drug to be present) to a drug known to cause LQTS (based on the drugs listed as causes of torsades, supplemented with other drugs available in Europe, http://www.torsades.org) |
| C | Acute coronary ischaemia (supported by ECG changes or elevated cardiac enzymes) in last 3 months or other underlying heart disease |
| M | Diagnosed as congenital LQTS |
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