Coronary Artery Z Score is Associated with Postoperative Outcomes in Patients with Anomalous Origin of Left Coronary Artery from the Pulmonary Artery

Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA) is a rare congenital cardiovascular anomaly that occurs in approximately 1 in 300,000 live births. This study aimed at identifying preoperative predictors of immediate postoperative outcomes. We conducted a retrospective, cross-sectional, single-center study and reviewed echocardiographic and hemodynamic data from all patients before and after surgical repair of ALCAPA at our center from January 2004 to February 2018. In all cases, the left coronary artery arose from the main pulmonary artery or a major branch. A total of 10 patients (age 1 month to 10 years, median 3 months) underwent ALCAPA surgical repair during the study period. No patients required a left ventricular assist device (LVAD) before surgery, but 4 patients (40%) received an LVAD after the surgery. The left ventricular ejection fraction (LVEF) improved in all patients following surgery. The utility of preoperative factors associated with pre- and post-procedure LVEF was investigated. LV dimension, as well as right coronary artery (RCA) and left coronary circumflex artery (LCX) Z scores were associated with a higher LVEF in the preoperative state. Patients with larger RCA, left ascending artery (LAD), and LCX Z scores also had a shorter duration of mechanical ventilation and ICU stay following surgery. Patients with a RCA Z score < 4 required implantation of an LVAD postoperatively. ALCAPA patients with larger RCA and LCX demonstrated a higher preoperative LVEF, while those with larger RCA, LAD, and LCX had superior postoperative hemodynamics and clinical outcomes.