On Thu, 14 Nov 1996 [log in to unmask] wrote:

> Results of TCD show now apparent intracranial 
> stenosis 

hi steve! 
i assume you mean NO apparent stenosis not NOW apparent stenosis. 
but if this is not a typo then:
need more specifics/findings r/e intracranial stenosis to answer this
question! where? based on what findings? mild/moderate/severe?

>however the PI values are low (.6-.8 range).  This finding is 
> symmetrical and pretty much global.  Any suggestions?  Might the elevated 
> diastolic values be due to pregnancy?  
> 

PI's .6-.8 somewhat low still WNL, per literature <.5 abnormal
?mean velocities also high everywhere? i suspect this is global high flow.

have not heard of high flow/low PIs specifically assosiated with pregnancy
but some of these factors affecting cerebral flow may be the culprit.

age                             (she is young at 35=higher flow)
blood pressure                  (does she have HTN?)
blood volume                    (dehydrated? multiple IVs?)
heart rate                      (rapid rate=less diastolic time=lower PIs)
hematocrit                      (did she bleed?low HCT=high flow)
intracranial pressure           (probably normal)
medications (vasodialators)     (any on board?)
O2/CO2 levels                   (could she be hyperventilating=high flow)
etc
etc

high flow is often of unknown etiology
known causes of high flow
            -head injury
            -young heathy people
            -mabee assosiated with migrane

good luck and thanks for all your flownet efforts!!!
(:watson