% brain utilization of total resting oxygen = 20%
% blood flow from heart to brain = 15-20% (Kandel et al., 2000)
Blood flow through whole brain (adult) = 750-1000 ml/min
Blood flow through whole brain (adult) = 54 ml/100 g/min
Blood flow through whole brain (child) = 105 ml/100 g/min
Cerebral blood flow = 55 to 60 ml/100 g brain tissue/min
Cerebral blood flow (gray matter) = 75 ml/100 g brain tissue/min
Cerebral blood flow (white matter) = 45 ml/100 g brain tissue/min (Rengachary, S.S. and Ellenbogen, R.G., editors, Principles of Neurosurgery, Edinburgh: Elsevier Mosby, 2005)
Oxygen consumption whole brain = 46 cm3/min
Oxygen consumption whole brain = 3.3 ml/100 g/min
Blood flow rate through each carotid artery = 350 ml/min (Kandel et al., Principles of Neural Science, New York: McGraw Hill, 2000)
Blood flow rate through basilar artery = 100-200 ml/min (Kandel et al., 2000)
Diameter of vertebral artery = 2-3 mm
Diameter of common carotid artery (adult) = 6 mm
Diameter of common carotid artery (newborn) = 2.5 mm

...TJ

On Wed, May 5, 2010 at 3:01 PM, JASON r wrote:
thank you..

but is there a standard volume of blood that should go to the brain?
Please, I have never heard of this. I under stand volume flow, and understand hemdynamic  changes, just never this calculation... Did I miss it somewhere. Is this used frequently.

Reason I am asking so many questions is I have never read this. Is this an old method of CCA volume flow rating?

Jason

Date: Wed, 5 May 2010 14:34:17 -0500

Subject: Re: ICA steal from CCA to Subclavian bypass graft

Jason,

stroke volume is calculated by the following  csa*vti.  where csa = crosectional area of the vessel,  vti = velocity time integral.

as i was saying it will give you the total flow in the carotid and the total flow in the graft simple math will tell you how much is left over to go to the brain.  this does not compensate for collateral, circle of willis, or any additional vertebral contribution to the cerebral circulation.  thats why the "steal" is a clinical diagnosis.

I had a patient once that had a cca to subclavian graft, an axillary to fem graft, a fem to fem graft and bilateral fem tib grafts.  his entire bilateral lower extremity circulation was fed by one common carotid.  he did not walk far before becoming syncopal.

...TJ

On Wed, May 5, 2010 at 12:08 PM, JASON r wrote:
what is a STROKE volume....? Is this the same as Graft Volume flow? And what is the correlation of stoke, and bypass grafts.....
Is there data on this... do you have the resource..
Curious
Jason

Date: Wed, 5 May 2010 11:25:55 -0500

Subject: Re: ICA steal from CCA to Subclavian bypass graft

calculate a stroke volume in the cca prox to the origin of the graft and a stroke volume in the graft, that will give you actual numbers for how much is being diverted.  the "steal" is a clinical diagnosis based on symptoms.

...TJ

On Wed, May 5, 2010 at 11:17 AM, Carla Stanley wrote:
Quick question:
Can you have a ICA steal from a CCA to subclavian artery bypass graft? If so how would you go about documenting it?

Carla Stanley, RVT
Comprehensive Vascular Care

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