An ECG should be requested by the prescribing clinician if the patient is at an increased risk of QT-interval prolongation, e.g. patients with bradycardia or a history of electrolyte imbalances. Atypical antipsychotics may not be appropriate for patients with a congenital long QT syndrome as use of atypical antipsychotics is associated with an increased risk of sudden cardiac death.21 In theory this risk may be further increased by the concurrent use of lithium