Patient selection: critically-ill patient in a resource-poor setting
Parameters:
(1) emergency surgery
(2) hemoglobin in g/dL, over range from 4 to 16
(3) serum BUN in mg/dL, over range from 10 to 610
(4) Glasgow Coma Score (GCS, from 3 to 15)
(5) systolic blood pressure in mm Hg, over range from 30 to 260
(6) respiratory rate in breaths per minute, over range from 4 to 40
points for hemoglobin in g/dL =
= 4 - (0.25 * (hemoglobin))
points for serum BUN in mg/dL =
= (0.016442 * (score)) + 0.019072
points for Glasgow coma score =
= 6 - (0.4 * (GCS))
|
Parameter
|
Finding
|
Points
|
|
emergency surgery
|
no
|
0
|
|
|
yes
|
1.41
|
|
systolic blood pressure
|
30 to 89
|
1.65 - (0.01833 * (SBP))
|
|
|
90 to 180
|
0
|
|
|
181 to 260
|
(0.0175 * (SBP)) - 3.15
|
|
respiratory rate
|
4 to 11
|
2.7 - (0.225 * (rate))
|
|
|
12 to 24
|
0
|
|
|
25 to 40
|
(0.225 * (rate)) - 5.4
|
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 24.2
X =
= (0.3673 * (score)) - 3.0449
probability of mortality =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.77.
