Smoczyńska A, Loen V, Sprenkeler DJ, et al. - Researchers investigated if imminent ventricular arrhythmias in patients can be predicted by short‐term variability of the QT interval (STV_QT). As part of the EU‐CERT‐ICD (European Comparative Effectiveness Research to Assess the Use of Primary Prophylactic Implantable Cardioverter Defibrillators) study, 24‐hour ECG Holter recordings were collected in 2,331 patients with primary prophylactic implantable cardioverter defibrillators. Prior to nonsustained ventricular arrhythmia, nonsustained ventricular tachycardia, and sustained ventricular tachycardia, an increase in STV_QT was evident from 0.80 ± 0.43 ms to 1.18 ± 0.78 ms, from 0.90 ± 0.49 ms to 1.14 ± 0.70 ms, and from 1.05 ± 0.22 ms to 2.33 ± 1.25 ms. In sustained ventricular tachycardia, this increase in STV_QT was found to be significantly higher vs nonsustained ventricular arrhythmia. Overall, findings showed a rise in STV_QT prior to imminent ventricular arrhythmias in patients, and there was a link between the extent of the increase and the severity of the ventricular arrhythmia.