Risk Score of Williams and Oz for a Mechanical Left Ventricular Assistance Device (Columbia-Presbyterian Score)

Description

Williams and Oz identified preoperative risk factors associated with mortality following placement of a mechanical left ventricular assistance device. This can help in obtaining informed consent from patients and family. The authors are from Columbia-Presbyterian Medical Center.

Parameters prior to placement:

(1) mechanical ventilation

(2) postcardiotomy shock

(3) pre-left ventricular assist device

(4) prothrombin time

(5) central venous pressure

Parameter	Finding	Points
mechanical ventilation	absent	0
	present	4
postcardiotomy shock	absent	0
	present	2
pre-left ventricular assist device	absent	0
	present	2
prothrombin time	<= 16 seconds	0
	> 16 seconds	1
central venous pressure	<= 15 mm Hg	0
	>= 16 mm Hg	1

total score =

= SUM(points for all 5 parameters)

Interpretation:

• minimum score: 0

• maximum score: 10

• The higher the score the greater the postoperative mortality.

• A score > 5 was associated with a 67% mortality rate.

Limitations:

• The score has not been validated in a prospective study.

• The reference range for prothrombin time needs to be given.

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Description

Specialty

ICD-10