I searched this forum for formula and found a couple i'll give the link and 1st post of the thread if that helps
http://www.valvereplacement.org/for...ze-Body-Surface-Calculation&highlight=formula
What about the Aortic Size / Body Surface Calculation?
I have read about the Aortic Size/Body Surface calculation. I saw it mentioned in this article (
http://emedicine.medscape.com/article/424904-overview). Going by my height and weight 6'4'' roughly 195 lbs, my body surface is calulated at 2.19 m2. 4.9 cm/2.19 is only 2.24 on that and according to that article this translates into a low risk. "In addition, relative aortic size in relation to body surface area may be more important than absolute aortic size in predicting complications. Using the aortic size index of aneurysm size divided by body surface area, patients are stratified into 3 groups: less than 2.75 cm/m2 are at low risk (4%/y), 2.75-4.24 cm/m2 are moderate risk (8%/y), and greater than 4.24cm/m2 are high risk for rupture (20%/y)."
Any thoughts on using that sort of calculation vs. absolute size?
http://www.valvereplacement.org/for...AV-Aneurysm-Surgery-Forumla&highlight=formula
I've been trying to find this formula for a while now.
An aorta that is enlarged and forming an aneurysm can be repaired, but at Cleveland Clinic we more often replace the damaged section with a section of plastic tubing that is sewn into position. The timing for repair of an aortic aneurysm is critical. When the valve is faulty and the aorta has enlarged to greater than 4.5 cm, we repair the aorta at the same time we repair or replace the valve. If the aorta has enlarged but the valve is still good, the optimal time to repair the aorta varies. At Cleveland Clinic, we have developed a special mathematical formula we use to determine this, based on the patient’s height and weight and the size of the aorta - surgery is usually recommended when the aortic cross sectional area in square centimeters, divided by the patient's height in meters is more than 10.
Source:
http://my.clevelandclinic.org/heart/...e_disease.aspx
If I understand this correctly and my calculations are correct, here are two examples:
I am 6'5" tall, which is 1.96 meters. Currently my ascending aorta is at 4.5 cm diameter, which calculates to a cross sectional area of 15.9 cm2. 15.9 divided by 1.96 = 8.1 which is less than 10, not time yet for surgery.
If and when my ascending aorta reaches 5.0 cm in diameter it will then have a cross sectional area of 19.6 cm2. 19.6 divided by 1.96 = 10, which is the recommended trip point for surgery on my aorta.
I'm a taller than average person. Based on a person that is, say 5'10 inches tall, the calculations are different. A person that height will have a calculated formula factor of 8.9 when her aneurysm is at 4.5, still not yet time for surgery. However, when her aneuysm reaches 4.7 cm, her formula factor rises to 9.8, and when the aneurysm is 4.8 cm across, her forumla factor is then 10.2, and surgery would be recommended according to the Cleveland Clinic formula.
there also was this thread talking about the CCf formula
http://www.valvereplacement.org/for...ula-Can-someone-help-please&highlight=formula