Cardiology>>>>>Aorta And Hypertension
Question 6#

According to Laplace’s law, a doubling of the radius results in:

A. Four times the circumferential wall stress
B. Eight times the circumferential wall stress
C. Twice the circumferential wall stress
D. Half the circumferential wall stress
E. Makes no difference to the circumferential wall stress as long as the pressure reduces by 20 mmHg

Correct Answer is C

Comment:

W = Pr/2h

here W is circumferential wall stress, P is pressure, r is radius, and h is wall thickness Given this, hypertension, aortic enlargement, and wall thinning are important factors in determining wall stress and therefore progression of aneurysms.