Holodiastolic Retrograde Flow in the Ascending Aorta in a Dog with Severe Aortic Regurgitation, Aortic Mineralization, and Systemic Hypertension.

• Diastolic retrograde flow may be seen in the Ao in a dog with severe AR. • Holodiastolic retrograde flow is described in people, typically in the descending Ao. • Holodiastolic retrograde flow within the Ao has not been reported in dogs. • Retrograde diastolic flow in the ascending Ao perfuses the CAs; undetectable on TTE.