<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi.I am trying to understand a report of a carotitid ultrasound. Pulse waves are regular and there is no arrhythmia - I can understand.Not sure what the following mean,PSED Velocity,Distal CCA: 659 cmsec,Max ICA: 8424 cmsec,ECA 8713 cmsec,ICACCA 1.29,Vertebral - antegrade flow  <response>: How fast does the blood move while the heart beats Peak systolic-PS? 65 cms in the common carotid artery. The artery branches into an internal to the brain and external to the face. That are ICA and ECA. The 1.29 is a ratio. All the numbers are quite reassuring. When the arteries narrow, the velocities go up. Systolic over 350 and diastolic over about 85 are high. The flow in all the arteries should be forward, ante grade. 