Related Experiment Videos
Diagnosis of right ventricular overload by body surface QRST isointegral maps in children with postoperative right
Y Asano1, N Izumida, K Kiyohara
1Department of Pediatrics, School of Medicine, Tokyo Medical and Dental University, Japan.
Insights
Body surface QRST isointegral maps (QRST-Imaps) effectively detect right ventricular overload in children, even with right bundle branch block. This non-invasive tool aids in diagnosing heart conditions in pediatric patients.
Area of Science:
- Cardiology
- Pediatric Electrophysiology
- Medical Imaging
Background:
- Right ventricular (RV) overload is a significant concern in pediatric cardiology.
- Conduction disturbances, such as right bundle branch block (RBBB), can complicate diagnosis.
- Assessing RV overload non-invasively is crucial for timely intervention.
Purpose of the Study:
- To evaluate the diagnostic utility of body surface QRST isointegral maps (QRST-Imaps) for detecting right ventricular overload.
- To determine if QRST-Imaps can identify RV overload in pediatric patients with postoperative right bundle branch block.
Main Methods:
- Analysis of QRST-Imaps in healthy children (n=31) and children with RBBB.
- Comparison of QRST-Imaps in patients with and without RV overload (n=15).
- Assessment of QRST-Imaps in pediatric patients who developed RBBB postoperatively.
Main Results:
- Healthy children and those with RBBB but no heart disease showed normal QRST-Imap patterns.
- Patients with RV overload exhibited abnormal QRST-Imaps with distinct features (double maxima, rightward shift).
- Postoperative RBBB patients with RV overload showed abnormal QRST-Imaps, while those without RV overload had normal maps.
Conclusions:
- Body surface QRST-Imaps are a valuable tool for detecting right ventricular overload in pediatric patients.
- QRST-Imaps can differentiate RV overload from conduction disturbances like RBBB.
- This non-invasive mapping technique aids in managing pediatric cardiac conditions.
Abstract:
The utility of body surface QRST isointegral maps (QRST-Imaps) for the detection of right ventricular (RV) overload was examined in children with postoperative development of right bundle branch block. In healthy children with no evidence of bundle branch block (n = 31), the QRST-Imap demonstrated a maximum at the left anterior chest and a minimum near the right shoulder with a single dipole distribution. The positive areas extended from the left anterior chest to the left back, and negative areas extended from the right anterior chest to the right back. Children with complete right bundle branch block but without heart disease demonstrated a QRST-Imap that was similar to that seen in normal children. In patients with RV overload (n = 15; 8 with ventricular septal defect and complicated anomaly and 7 with tetralogy of Fallot), the QRST-Imaps were abnormal and demonstrated double maxima, a rightward shift of the maximum, and extension of positive areas to the right chest. In the 10 patients who developed postoperative complete right bundle branch block, 4 had no evidence of RV overload by hemodynamic or echocardiographic assessment and demonstrated a normal QRST-Imap. In the six children who had residual RV overload during hemodynamic assessment, the QRST-Imap was abnormal. These results suggest that the QRST-Imap is a useful method for the detection of RV overload in pediatric patients complicated with conduction disturbances.