Fig. 2 A: Cardiac point-of-care ultrasound parasternal long-axis view of aortic arch in suprasternal fossa depicting persistent fifth aortic arch type B. The upper arch was the (fourth) aortic arch (white asterisks) interrupted, the lower arch was persistent fifth aortic (yellow asterisks) with critical coarctation at the origin of the ductus arteriosus (white arrow). B: Continuous wave Doppler echocardiography demonstrated that the peak flow velocity through the narrowest point of the descending aorta was 3.1m/s and pressure was 37 mmHg.