high resistance blood flow

Hey guys, I have had two ultrasounds now because the blood flow in the umbilical cord was abnormal. Essentially there is supposed to be low resistance in the flow and mine has high resistance. I am waiting for a call from a perionatalogist (sp?) to get a level 2 ultrasound done in which they would be able to tell me more but I was just curious if anyone else has been diagnosed with this and what they have been told. Thanks!