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

Description

Ambler et al developed models for predicting in-hospital mortality following repair of an abdominal aortic aneurysm. One model uses perioperative 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) minimum systolic blood pressure during surgery

(6) history of cardiac disease

(7) intraoperative blood loss (scaled from 1 to 4)

(8) ASA grade

(9) serum albumin n g/L

(10) maximum intraoperative pulse in beats per minute

Blood Loss	Factor
< 1 liter	1
1 to 2 liters	2
2 to 5 liters	3
> 5 liters	4

Parameter	Finding	Points
AAA reoperation	no	0
	yes	1.6319
admission mode	planned (elective)	0
	emergency	1.3532
	unplanned nonemergency	0.6284
age in years		0.0467 * (age)
serum creatinine		0.0036 * (creatinine)
cardiac history	no	0
	yes	0.4601
blood loss		0.5818 * (factor)
ASA grade		0.3636 * (ASA)
serum albumin		-0.0286 * (albumin)
minimum systolic blood pressure		- 0.0197 * (SBP)
maximum pulse		0.0000455 * ((pulse)^2)

X =

= SUM(points for all 10 parameters) - 7.4339

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: Perioperative Score

Description

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