Bai et al reported a nomogram for predicting cardiovascular morbidity in a patient undergoing pheochromocytoma surgery. The authors are from China Medical University in Shenyang, China.
Patient selection: pheochromocytoma surgery
Parameters:
(1) body mass index (BMI) in kg per square meter, from 12 to 40
(2) intraoperative hemodynamic instability (IHD)
(3) coronary heart disease (CHD)
(4) tumor size in cm, from 0 to 18
(5) use of crystalloid and/or colloid
points for BMI =
= 142.86 - (3.57 * (BMI))
points for tumor size =
= 2.389 * (cm)
|
Parameter
|
Finding
|
Points
|
|
IHD
|
no
|
0
|
|
|
yes
|
23.5
|
|
CHD
|
no
|
0
|
|
|
yes
|
12
|
|
crystalloid and/or colloid
|
no
|
0
|
|
|
yes
|
11.5
|
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 190
value of X =
= (0.0751 * (score)) - 8.951
risk of cardiovascular morbidity =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.87.
