MDCalc

POSSUM for Operative Morbidity and Mortality Risk

Estimates morbidity and mortality for general surgery patients.

Use values at the time of surgery, not admission.

NOTE: The POSSUM should not be used for trauma patients.

Physiological score

years
Cardiac
Respiratory
mm Hg
beats/min
ECG

Operative severity score

Operative severity
See About section for examples of surgeries in each category.
Number of procedures
mL
Peritoneal soiling
Presence of malignancy
Diagnosed before or during surgery
Mode of surgery

Result:

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Advice

Risk estimates can help patients and family members in the process of informed consent and in management of expectations.

Management

The POSSUM should be calculated when the decision to operate is made. The percentages can be shared with the patient when discussing the risks of the operation.