Smoczyńska A, Loen V, Sprenkeler DJ, et al. - Researchers investigated if imminent ventricular arrhythmias in patients could 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, a rise in STV_QT was noted 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. This increase in STV_QT was shown to be significantly higher in sustained ventricular tachycardia vs nonsustained ventricular arrhythmia and vs nonsustained ventricular arrhythmia. Overall, findings revealed increase of STV_QT before imminent ventricular arrhythmias in patients, and the extent of the rise was found to be related to the severity of the ventricular arrhythmia.