AAA SCORE of Ambler et al for a Patient Undergoing Repair of an Abdominal Aortic Aneurysm: Preoperative Score

Description

Ambler et al developed models for predicting in-hospital mortality following repair of an abdominal aortic aneurysm. One model uses preoperative data. The authors are from the Audit and Quality Improvement Committee of the Vascular Society of Great Britain and Ireland.

Patient selection: repair of an abdominal aortic aneurysm

Outcome: in-hospital mortality

Parameters:

(1) AAA reoperation

(2) admission mode

(3) age in years

(4) serum creatinine in µmol/L

(5) lowest systolic blood pressure prior to surgery

(6) history of cardiac disease

(7) type of surgery

(8) ASA grade

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

Parameter	Finding	Points
AAA reoperation	no	0
	yes	1.7691
admission mode	planned (elective)	0
	emergency	1.47731
	unplanned nonemergency	0.6877
age in years		0.0493 * (age)
serum creatinine		0.0035 * (creatinine)
cardiac history	no	0
	yes	0.4649
type of surgery	open	0
	EVAR	-0.9526
ASA grade		0.5102 * (ASA)
WBC in 10^9/L		0.0279 * (factor)
lowest preop systolic blood pressure		(0.000101 * ((SBP)^2)) - (0.0307 * (SBP))

X =

= SUM(points for all 9 parameters) - 7.1026

probability of in-hospital mortality =

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

Performance:

• The area under the ROC curve is 0.89.

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AAA SCORE of Ambler et al for a Patient Undergoing Repair of an Abdominal Aortic Aneurysm: Preoperative Score

Description

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