Alternation of the QRS complex - new or well-forgotten old? Clinical observations
Abstract
Three cases of registration of a rare electrocardiographic (ECG) phenomenon - alternation of the QRS complex (AQRS) are presented. AQRS was detected in two girls aged 6 and 16 with third variant of long QT syndrome (LQT3) and in an asymptomatic patient aged 13 with a family history of sudden death at a young age. AQRS was recorded in combination with macroscopic alternans of the T wave during Holter monitoring and bicycle ergometry. A definition of AQRS is given and possible mechanisms and clinical significance of the detected ECG phenomenon are discussed.
Fields of Study & Subjects
Cardiac electrophysiology and arrhythmias
Cardiac pacing and defibrillation studies
Cardiac Arrhythmias and Treatments
Publication details
- Journal / source
- Journal of Arrhythmology
- Volume
- 32
- Issue
- 4
- Pages
- 59–64
- Publication date
- 13 January 2026
- Language
- EN