Explain why blood flow and volume measurements are performed. What are the stren

Question

Explain why blood flow and volume measurements are performed. What are the strengths and weaknesses of performing blood flow measurements? Discuss this in the context of measurement data provided by pressure, electrical, and chemical biosensors. Clearance is defined as the minimal volume of blood entering an organ per unit time required to supply the amount of indicator removed from the blood per unit time during the blood's passage through the organ. Derive a formula for renal clearance, given the arterial concentration of the indicator para amino hippuric acid (PAH), all of which is excreted by the kidneys into the urine. Give units.

Explanation / Answer

(a) because of noninvasive technique.

(b) Measuring Blood Flow a Key Link Between Systemic and Regional Metabolism

High-resolution

Signal strength maintained at hematocrits > 10%. Distortion of pulsed Doppler signal peaks occurred in the conscious rabbit at peak aortic velocities, at which Reynold's number for turbulence exceeded and the Doppler shift surpassed the Nyquist limit of 31.25 kHz for the velocimeter. Although the Doppler shift-volume flow relationship is linear at < 5 kHz, in some cases at higher Doppler shifts and blood flow velocities the relationship may become nonlinear, thus causing the volume flow rate to be underestimated by up to 38%. The cause of this phenomenon may be "aliasing" and/or the consequence of the range control capability of the velocimeter selectively sampling changing velocity profiles and flow disturbances in the central stream at higher velocities.

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