Key result
Combination therapy and ICD fail to completely prevent intermittent VF in pediatric short QT syndrome.
Why the study?
Short QT syndrome is a rare cardiac channelopathy that can cause malignant arrhythmia and sudden cardiac arrest.
Does combination antiarrhythmic therapy and ICD implantation prevent malignant arrhythmias in a pediatric patient with refractory short QT syndrome?
Case Report (n=1)
Does combination antiarrhythmic therapy and ICD implantation prevent malignant arrhythmias in a pediatric patient with refractory short QT syndrome?
In pediatric short QT syndrome refractory to quinidine, combination antiarrhythmic therapy and ICD implantation are necessary, though electrical storms may still persist.
May inform expanded genetic testing in pediatric SQTS; leaves open discovery of non-ion channel variants.
BACKGROUND: Short QT syndrome (SQTS) is a rare cardiac channelopathy and can cause malignant arrhythmia and sudden cardiac arrest. CASE SUMMARY: A 4-year-and-6-month-old girl presented with intermittent convulsions and recurrent ventricular fibrillation requiring multiple electrical cardioversions. Electrocardiogram revealed a QTc interval ranging from 294 to 324 milliseconds and polymorphic ventricular tachycardia. Whole-exome sequencing was performed, which revealed no mutations in ion channel-related genes. Quinidine can prolong the QT interval but failed to reduce the occurrence of premature ventricular arrhythmia. Based on the origin site of premature ventricular contractions and literature reports, verapamil and mexiletine were added to the treatment regimen. After the implantation of implantable cardioverter-defibrillator, intermittent ventricular fibrillations still occurred during the 6-month follow-up. DISCUSSION: When the use of quinidine alone was insufficient to prevent electrical storms, lidocaine test and electrocardiographic characteristics can help guide drug selection. TAKE-HOME MESSAGES: In pediatric SQTS, when high-dose quinidine fails to reduce the risk of sudden death, combination therapy with other antiarrhythmic drugs should be considered. Implantable cardioverter-defibrillator implantation remains the most effective method for preventing sudden death in children with SQTS.
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Wang et al. (2026) conducted a case report in Short QT syndrome (n=1). Quinidine, verapamil, mexiletine, and implantable cardioverter-defibrillator was evaluated on Occurrence of ventricular fibrillation. Combination therapy and ICD implantation in a 4-year-old girl with short QT syndrome (QTc 294-324 ms) did not completely prevent intermittent ventricular fibrillations over 6 months.
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