Mean blood flow was 1.99 l/min at baseline with a range of 0.39 3.05 l/min.
Transcranial color coded sonography (TCCS) is a non-invasive bedside technique that allows the measure of mean blood flow velocity (mFV) of cerebral arteries.
Fig. 1 The effect of 5-ISMN 30 mg t.i.d for 7 days on headache, mean blood flow velocity in middle cerebral artery and diameter of temporal artery.
Mean blood flow velocity (mFV) of middle cerebral arteries on either side was obtained every 1 2 day for 14 days after the bleeding.
The decrease in mean blood flow velocity in MCA (Fig. 1) was still present 60 min after GTN infusion indicating dilatation.
The mean blood flow is computed to yield an average of pixels in a region of interest within the scanned area with the software provided by the manufacturer (LDPIwin software).
The authors concluded that the decrease in mean blood flow, which was the result of increased vascular tone induced by hyperventilation, was responsible for the rise in peripheral venous-to-arterial CO2 difference that they observed after acute hyperventilation.
The inlet conditions were based on mean blood flow and diameter measurements obtained from human left anterior descending coronary artery (LAD) [12].
The mean blood flow for the tumor tissue within the region of interest was derived, and image window and level were fixed.
Bilateral simultaneous transcranial Doppler (TCD) ultrasound was used to measure mean blood flow velocities (MBFV) in the right and left middle cerebral arteries (MCAs) in 24 (15 females and 9 males) right-handed normal subjects.
From measurement of the vessel diameters and centerline blood flow velocity, the Newtonian wall shear rate [s−1] was estimated as 8×[Vb/d], where Vb is the mean blood flow velocity, d is the diameter of the vessel.
