The Risk Model for Delirium (RD score) can help to identify a patient at risk for delirium. It was developed at Reinier de Graaf Hospital in Delft, The Netherlands.
Parameters:
(1) history of delirium during previous hospital admission
(2) dementia
(3) clock drawing (displaying 10 minutes past 11)
(4) age in years
(5) hearing
(6) vision
(7) activities of daily living at home (meals/housework, physical care)
(8) use of opiates (heroin, methadone, morphine)
(9) number of alcoholic drinks per day
Parameter
Finding
Points
history of delirium
no
0
yes
5
dementia
absent
0
present
5
clock drawing
no mistakes
0
small mistakes
1
unrecognizable, unable
2
age
< 70 years
0
70 to 85 years
1
> 85 years
2
hearing
impaired (unable to hear speech)
1
not impaired
0
vision
impaired (less than 40%)
1
not impaired
0
need help with meal prep or housework
no
0
yes
0.5
need help with physical care
no
0
yes
0.5
use of opiates
no
0
yes
2
alcohol intake
< 4 drinks per day
0
>= 4 drinks per day
2
total score =
= SUM(points for all 10 parameters)
Interpretation:
• minimum score: 0
• maximum score: 21
• A score >= 5 is associated with delirium.
Performance:
• The area under the ROC is 0.73.
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