Prevalence and management of coronary artery anomalies in tetralogy of Fallot at Cheikh Zaid Hospital’s Pediatric Cardiac Surgery Department in Morocco: retrospective study

INTRODUCTION: Tetralogy of Fallot (TOF) is one of the most common cyanogenic congenital heart defects. It represents 10% of congenital heart diseases in children. Coronary artery anomalies (CAA) have been reported in 2% to 14% of cases in patients with TOF, according to angiographic, surgical and autopsy series. Many of these anomalies are difficult to detect during surgery. The objective of this article is to study the prevalence of the coronary artery anomalies in patients with TOF as well as their surgical management in our hospital between 2007 and 2015. METHODS: A retrospective study was conducted on 90 patients with TOF aged 1 month to 10 years who were operated on in the Department of Paediatric Cardiac Surgery of Cheikh Zaid Hospital between 2007 and 2015. None of the patients had preoperative coronary angiography and all the anomalies were diagnosed during surgery. Patient clinical data were collected from patient records and from the hospital information system. The qualitative variables are expressed as mean and standard deviation and the quantitative variables are expressed as a percentage. Statistical analyses were performed using SPSS 13.0 software. RESULTS: Of the 90 patients with TOF followed in the study period, 9 (10%) patients had coronary artery anomalies. We found in 3 (33%) patients an anomalous origin of the left anterior descending coronary artery (LAD) from the right coronary artery (RCA), an anomalous origin of the RCA from the left coronary trunk (LCT) in 1 (11%) patient and a large infundibular branch blocking the pulmonary infundibulum in 5 (56%) patients. All the patients underwent a complete surgical treatment (closure of the ventricular septal defect (VSD) by patch plus stenosis resection plus infundibular enlargement by patch). Eight (89%) patients progressed well in postoperative care and 1 (11%) died immediately after surgery in intensive care. CONCLUSION: The coronary anomalies detected in patients with TOF are rare but represent a challenge for the surgical team because of the difficulty of diagnosing them pre-operatively. The management of these anomalies is mainly surgical and the technique used by our team is proved to be safe and effective.