Ha et al reported a nomogram for predicting a difficult urethral catheterization of a male. This can help to identify a patient who may require catheterization by a urologist. The authors are from Columbia University.
Patient selection: male
Parameters:
(1) body mass index
(2) genitourinary implant
(3) blood at meatus
(4) urethral stricture
(5) consult service
(6) history of BPH surgery
(7) radical prostatectomy
Parameter
Finding
Points
BMI
normal
0
overweight
28
obese
10.3
GU implant
no
0
yes
74
blood at meatus
no
0
yes
48.3
urethral stricture
no
0
yes
97.3
consult service
medicine
12.5
ICU
54.6
ED
84.8
surgery
100
other
0
history BPH surgery
no
0
yes
19.5
radical prostatectomy
no
0
yes
27.4
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 394.5
value of X =
= (0.01856 * (score)) - 3.274
probability of difficult urethral catheterization =
- 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.75.
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