Preoperative Evaluation & Periope rative Management Table 3–6.

Table 3–6. Risk factors for the development of postoperative delirium.

Preoperative factors
Age > 70 years
Alcohol abuse
Cognitive impairment
Poor physical function status
Markedly abnormal serum sodium, potassium, or glucose level
Aortic, thoracic, hip fracture surgery, or emergency surgery

Postoperative factors
Use of meperidine or benzodiazepines, anticholinergics, antihistamines
Postoperative hematocrit < 30%
Use of urinary catheters