Open Abdominal Aortic Aneurysm Surgery Outcome Model

 

Patient selection: open abdominal aortic aneurysm repair

 

Parameters:

(1) gender

(2) mode of admission

(3) age on admission in years

(4) blood urea in mmol/L

(5) serum sodium in mmol/L

(6) serum potassium in mmol/L

(7) hemoglobin in g/dL

(8) white blood cell (WBC) count in 10^9/L

Parameter	Finding	Points
gender	female	0
	male	1
mode of admission	elective	0
	nonelective	1

 

X =

= (0.1511 * (points for gender)) + (0.994 * (points for mode of admission)) + (0.05923 * (age)) + (0.001401 * (urea)) - (0.01303 * (sodium)) - (0.03585 * (potassium)) - (0.2278 * (hemoglobin)) + (0.02059 * (WBC count) - 2.257

 

risk of death =

= 1 / (1 + EXP((-1) * X))