Coronary Artery Dimensions on Computed Tomography Following the Neonatal Arterial Switch Operation for the Complete
Marcell Fontos1,2, Zsolt Nagy1, Zsolt Prodán1
1Gottsegen National Cardiovascular Center, Budapest, Hungary.
Insights
Coronary artery dimensions after arterial switch surgery were assessed in pediatric patients. Acute branching angles and anterior origins were linked to smaller coronary artery diameters, suggesting potential long-term risks.
Area of Science:
- Cardiovascular Surgery
- Pediatric Cardiology
- Medical Imaging
Background:
- Coronary events are serious long-term complications following the arterial switch operation for complete transposition of the great arteries.
- Understanding coronary artery dimensions post-surgery is crucial for predicting and preventing adverse outcomes.
Purpose of the Study:
- To evaluate the dimensions of reimplanted coronary arteries in pediatric patients after arterial switch operation.
- To investigate the relationship between coronary artery geometry and diameter to understand underlying mechanisms.
Main Methods:
- Coronary computed tomography angiography (CCTA) was performed on 78 asymptomatic pediatric patients.
- Detailed analysis of coronary ostia position, branching angles, and diameters was conducted in 51 patients.
- Z-scores were calculated for the diameters of the left main (LMCA), left anterior descending (LAD), left circumflex (LCX), and right coronary arteries (RCA).
Main Results:
- Most coronary artery diameters were within the normal range, indicating generally good development.
- A positive correlation was found between the ostial LMCA diameter Z-score and its distance from the pulmonary artery and branching angle.
- Smaller ostial diameter Z-scores were associated with acute branching angles and more anterior origins of the coronary arteries.
Conclusions:
- While overall coronary development appears normal, specific geometric factors like acute branching angles and anterior origins are linked to smaller ostial diameters.
- Further follow-up studies are needed to confirm the clinical significance of reduced ostial diameters in high-risk coronary arteries and their changes over time.
Abstract:
Coronary events are life-threatening long-term complications of the arterial switch operation for complete transposition of the great arteries. The aim of our study was to assess the dimensions of the reimplanted coronary arteries and their relationship with the various geometric characteristics to gain a better understanding of the involved mechanisms. Coronary computed tomography angiography (CCTA) scans of 78 asymptomatic pediatric patients were performed at the age of 10.7 (6.3-17.8) years. The position of the ostia, the branching angles, and the diameters of the coronary arteries were determined in a subgroup of 51 patients presenting the usual preoperative coronary anatomy. Mean Z-score of the left main coronary artery (LMCA), left anterior descending coronary artery (LAD), left circumflex coronary artery (LCX), and right coronary artery (RCA) diameters were 0.7 ± 1.2, - 0.4 ± 1.1, - 0.3 ± 1.1, and - 0.3 ± 1.1, respectively. The Z-score of the ostial LMCA diameter had a positive correlation with the remoteness from the main pulmonary artery (p < 0.001) and the branching angle (p = 0.001). The ostial diameter Z-score of the LMCA had a negative correlation with the interval between the arterial switch operation and the CCTA (p = 0.004). Even though most of the coronary diameters fell within the accepted range, which suggests normal overall development, acute branching angle and more anterior origin were associated with smaller ostial coronary artery diameter Z-scores. To prove the clinical relevance of the smaller ostial diameter of high-risk left coronary arteries and the decrease of ostial coronary artery Z-scores over time needs further follow-up studies.
