Vascular Biochemistry and Haematology Outcome Model (VBHOM) of Tang et al for a Patient Undergoing Lower Limb Amputation for Critical Ischemia

 

Patient selection: lower limb amputation for critical ischemia

 

Outcome: mortality (time interval not specified)

 

Parameters:

(1) gender

(2) mode of admission

(3) age on admission

(4) urea in mmol/L

(5) serum sodium in mmol/L

(6) serum potassium in mmol/L

(7) hemoglobin in g/dL

(8) coefficient for the white blood cell count in 10^9/L

(9) serum creatinine in µmol/L

 

urea to creatinine ratio =

= (urea) / (creatinine)

Parameter	Finding	Points
gender	female	0
	male	1
mode of admission	elective	0
	not elective	1

 

X =

= (0.5942 * (points for gender)) + (1.069 * (points for mode of admission)) + (0.0119 * (age)) + (0.0319 * (urea)) - (0.0432 * (sodium)) - (0.0037 * (potassium)) - (0.126 * (hemoglobin)) + (0.0679 * (WBC coefficient)) - (0.0004 * (creatinine)) - (3.397* (urea to creatinine ratio) + 3.495

 

risk of death =

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