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Small left coronary arteries after arterial switch operation for complete transposition
K Yatsunami1, M Nakazawa, C Kondo
1Department of Pediatric Cardiology, Heart Institute of Japan, Tokyo Women's Medical College, Japan.
Insights
After arterial switch operation for complete transposition of the great arteries, left coronary arteries are smaller than normal. Further follow-up is needed to understand the clinical impact of this finding in pediatric cardiac surgery patients.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease Surgery
- Cardiovascular Imaging
Background:
- Post-arterial switch operation (ASO) in patients with complete transposition of the great arteries (TGA), myocardial perfusion and ventricular function can be compromised.
- The underlying mechanisms for these functional deficits remain incompletely understood.
Purpose of the Study:
- To investigate coronary artery dimensions in patients following ASO for TGA.
- To assess the relationship between coronary artery size and ventricular function mid-term after surgery.
Main Methods:
- Coronary artery diameters (right, left main trunk, LAD, circumflex) were measured using computer-assisted densitometry.
- Measurements were performed in 86 patients at 8-86 months (mean 47.5 months) post-ASO.
- Z scores were calculated and compared to controls; correlation with left ventricular ejection fraction (LVEF) was assessed.
Main Results:
- Right coronary arteries showed a trend towards larger Z scores (+2.0 +/- 0.3).
- Left anterior descending and circumflex coronary arteries were significantly smaller (Z scores -1.8 +/- 0.3 and -1.5 +/- 0.3, respectively).
- Overall cross-sectional area of the three assessed coronary arteries was reduced (Z score -1.5 +/- 0.3) and did not correlate with LVEF.
Conclusions:
- Mid-term follow-up after ASO for TGA reveals hypoplasia of the left coronary arteries.
- The clinical significance of these findings requires further investigation through careful, long-term follow-up studies.
- This highlights potential implications for myocardial perfusion and ventricular health in TGA survivors.
Background:
Myocardial perfusion is not completely normal and ventricular function is depressed in some patients after the arterial switch operation. The basic mechanism has not yet been defined totally.
Methods:
The diameters of the right, left main trunk, anterior descending, and circumflex coronary arteries were measured by computer-assisted densitometry at 8 to 86 months (mean, 47.5 months) after the arterial switch operation in 86 patients.
Results:
The Z scores, compared with control, were +2.0 +/- 0.3, -1.8 +/- 0.3, and -1.5 +/- 0.3 for the right, left anterior descending, and circumflex coronary arteries, respectively. The Z score for the total cross-sectional area of the three vessels was -1.5 +/- 0.3. These parameters did not correlate with left ventricular ejection fraction.
Conclusions:
At the midterm follow-up after the arterial switch operation for complete transposition of the great arteries, the left coronary arteries are small. A careful follow-up study is mandatory to clarify the clinical significance of this finding.