 Patent ductus arteriosus is the most common defect.Septal defects (ventricular septal defects and atrial septal defects) are also common, as are patent foramina ovalia.Other cardiac anomalies include mitral valve regurgitation, mitral valve prolapse, bicuspid pulmonary valve, hypoplastic transverse aortic arch, tricuspid valve regurgitation, right ventricular hypertrophy, and pulmonic stenosis.