The body surface QRST isointegral maps in infants with right ventricular overload

Area of Science:

• Cardiology
• Biomedical Engineering
• Pediatric Electrophysiology

Background:

• Standard electrocardiographic criteria for infant right ventricular (RV) hypertrophy have limited diagnostic accuracy.
• Accurate diagnosis of RV overload in infants is crucial for timely intervention.

Purpose of the Study:

• To evaluate the diagnostic utility of the QRST isointegral map (QRST-Imap) for detecting right ventricular (RV) overload in infants.
• To differentiate patterns of RV overload in specific congenital heart diseases.

Main Methods:

• Utilized QRST isointegral mapping of body surface potential distribution in infants.
• Compared QRST-Imaps of infants with RV overload (atrial septal defect, pulmonary stenosis, tetralogy of Fallot) to age-matched healthy infants.
• Analyzed spatial distribution and amplitude of QRST-Imap maxima.

Main Results:

• Healthy infants (NOR) exhibited a single dipole pattern with one maximum on the left anterior chest.
• Infants with RV overload showed abnormal QRST-Imaps with two maxima or a rightward shift of the maximum with increased amplitude.
• Specific patterns were observed for atrial septal defect (two maxima, decreased integral), pulmonary stenosis (two maxima, increased right integral correlating with pressure), and tetralogy of Fallot (single anterior median maximum, increased amplitude).

Conclusions:

• QRST-Imaps provide valuable insights into the presence and specific patterns of right ventricular overload in infants.
• This technique offers improved diagnostic accuracy compared to traditional electrocardiographic criteria for RV hypertrophy in this age group.