Zhong et al reported a nomogram for predicting the risk of postoperative nausea and vomiting (PONV) after emergency surgery. The authors are from Fujian Medical University, UNiversity of Otago, and Quanzhou Medical College.
Patient: emergency surgery
Parameters:
(1) sex of the patient
(2) history of migraine headaches
(3) history of postoperative nausea and vomiting
(4) cross sectional area of the gastric antrum in square cm from gastric ultrasound
points for cross sectional area =
= (7.1429 * (area)) - 7.1429
Parameter
Finding
Points
sex
male
0
female
74.8
history of PONV
no
0
yes
73.4
history of migraines
no
0
yes
37.2
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 285.4
value of X =
= (0.0246 * (score)) - 3.038
probability of PONV =
= 1 / (1+EXP((-1) * X))
Performance:
• The C-index was 0.83 in the training and validation cohorts.
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