The following mneumonic can be used to aid in remembering the common causes of post-op<unk> :
Wind (POD 1-2) - pneumonia, pulmonary embolism
Water (POD 3-5) - UTI, specifically if an indwelling foley catheter is in place
Walking (POD 4-6) - DVT/PE related to immobility
Wound (POD 5-7) - surgical site infection
Wonder Drugs (POD >7) -<unk>  related to IV lines, or drug<unk> 
Surgery
Anthony LuceroClaireRoss Donaldson
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Post-operative fever
The following mneumonic can be used to aid in remembering the common causes of post-op fever:
Leaking G-tube
Wind 
CVC catheter problems
Water 
Deterioration after intubation
Walking 