Question

Determine whether the kinetic-energy term is significant for measurement of pressure in the human descending aorta. Assume that the peak velocity of flow in the center of the aorta is approximately 1.5 m/s and that the density of the blood p is 1060 kg/m 1) (In general, if the true value is N and the error is n, then if n/N > 5%, the error is significant if n/N < 1%, the error is not significant, if 1% < nN < 5%, the error is either significant or insignificant depending upon the circumstance.) 2) If we measured a systolic pressure of a person at knee level (which is 75 cm below the heart level) is 187 mmHg. What is the correct systolic pressure of the person?

Answer 1

1, kinetic energy for measurement of aortic valve pressure can differ as per heart valve hemodynamic performance..Kinetic energy qualification method is conventional and gold-standard method, feasibility of Kinetic energy qualification investigated with cardio vascular flow,like aortic stenosis, aortic coarction and mitral valve regurgitation,need more attention..catheter pressure port focus the upstream and down stream valve than the side pressure..Kinetic energy is the substantial part of the total pressure..
Kinetic energy term is(1/2)pV2
catheter pressure can significantly affect the aortic pressure
P= 1060kg/m3
V= 1.5m/s2
1/2(1060kg/m3) (1.5m/s2)
1/2(1060kg/m3) (1.5X1.5)
1/2 (1060X2.25)
1/2 /2,385= 1,192pa
pressure of the catheter can affect the aortic pressure
2, systolic pressure of a person in knee level 187mm Hg
which is 75cm below the heart level
so add 75cm with knee level pressure
187+75
correct systolic pressure =262mmHg