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Figure 1 :(a) Suprasternal long axis view of the aortic arch showing a posterior shelf (arrow) Figure 1b: Continuous wave Doppler interrogation across the arch before closure of duct, showing peak systolic gradient of 30 mm Hg, with no diastolic spill

Figure 1 :(a) Suprasternal long axis view of the aortic arch showing a posterior shelf (arrow)
Figure 1b: Continuous wave Doppler interrogation across the arch before closure of duct, showing peak systolic gradient of 30 mm Hg, with no diastolic spill