A 60-year old patient underwent renal aery doppler which shows narrowing and turbulence in right renal aery. If radius of the aery is reduced by 1/3rd, resistance to blood flow in right kidney would have increased by:
"Fouh power law" of radius ~ Blood flow varies directly and resistance inversely with the fouh power of the radius (r 4). If the radius is changed by a factor of 3 (reduced by 1/3rd), resistance would change by (34).
3 times
9 times
16 times
81 times
Cardiac Output