Oxford Acute Severity of Illness Score (OASIS)

Description

Johnson et al reported the Oxford Acute Severity of Illness Score (OASIS) for describing the illness severity of a patient in the intensive care unit (ICU). The authors are from Oxford University and Cerner Corporation.

Patient selection: ICU patients >= 16 years of age, non-burn, admitted >= 4 hours

Parameters:

(1) length of stay (LOS) prior to ICU admission

(2) reason for admission

(3) age in years

(4) Glasgow coma score (GCS)

(5) mean arterial pressure in mm Hg

(6) respiratory rate in breaths per minute

(7) temperature in °C

(8) urine output in mL per day

(9) ventilation

Parameters	Findings	Points
length of stay prior to ICU	< 0.17 hours	5
	0.17 to 4.94 hours	3
	4.95 to 24 hours	0
	24.01 to 311.8 hours	2
	> 311.8 hours	1
reason for admission	elective surgery	0
	other	6
age in years	16 to 23 years	0
	24 to 53 years	3
	54 to 77 years	6
	78 to 89 years	9
	>= 90 years	7
Glasgow coma score	15	0
	14	3
	8 to 13	4
	3 to 7	10
mean arterial pressure	> 143.44 mm Hg	3
	61.33 to 143.44 mm Hg	0
	51 to 61.32 mm Hg	2
	20.65 to 50.99 mm Hg	3
	< 20.65 mm Hg	4
respiratory rate	< 6 breaths per minute	10
	6 to 12	1
	13 to 22	0
	23 to 30	1
	31to 44	6
	>= 45 breaths per minute	9
temperature in °C	< 33.22°C	3
	33.22 to 35.93	4
	35.94 to 36.39	2
	36.4 to 36.88	0
	36.89 to 39.88	2
	>= 39.89°C	6
urine output in mL/day	< 671 mL	10
	671 to 1,426.99	5
	1427 to 2543.99	1
	2544 to 6896	0
	>= 6897 mL	8
ventilated	no	0
	yes	9

total score =

= SUM(points for all 9 parameters)

Interpretation:

• minimum score: 0

• maximum score: 75

• The higher the score the more severe the patient's illness, the higher the ICU mortality and the hospital mortality.

• A score less than 10 was associated with low mortality while a score above 25 was associated with a high mortality.

Performance:

• The areas under the ROC curve was 0.90 in validation data set using the multivariable model.

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Oxford Acute Severity of Illness Score (OASIS)

Description

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