Observational Study
Copyright ©The Author(s) 2020.
World J Orthop. Feb 18, 2020; 11(2): 90-106
Published online Feb 18, 2020. doi: 10.5312/wjo.v11.i2.90
Table 6 Perioperative risk factors and adjusted association with postoperative delirium by procedure
THAOR (95%CI), n = 18276THA P valueTKAOR (95%CI), n = 19987TKA P valueSFOR (95%CI), n = 4183SF P value
Age, yr
≥ 70 vs < 704.9 (3.0, 7.9)< 0.001a2.16 (1.58, 2.94)< 0.001a--
≥ 65 vs < 65----2.76 (1.79, 4.25)< 0.001a
Male0.90 (0.60, 1.35)0.620.82 (0.60, 1.12)0.210.73 (0.48, 1.10)0.13
BMI0.94 (0.90, 0.98)0.004a0.99 (0.96, 1.02)0.370.99 (0.95, 1.02)0.46
Latest creatinine value before surgery
1.2-2.0 mg/dL vs < 1.2 mg/dL1.77 (1.05, 3.00)0.03a0.79 (0.49, 1.27)0.321.40 (0.73, 2.68)0.31
> 2.0 mg/dL vs < 1.2 mg/dL4.08 (1.06, 15.66)0.04a1.39 (0.46, 4.20)0.562.26 (0.20, 26.24)0.51
Preoperative hyponatremia2.36 (1.54, 3.64)< 0.001a1.25 (0.87, 1.79)0.231.24 (0.82, 1.88)0.31
PCA route
IV vs Epidural1.98 (1.19, 3.28)0.008a1.26 (0.83, 1.92)0.27--
Peripheral nerve infusion vs Epidural--0.93 (0.47, 1.86)0.85--
Postoperative thiamine order5.05 (2.72, 9.37)< 0.001a6.40 (4.00, 10.26)<0.001a6.64 (3.72, 11.85)<0.001a
ASA Score
2 vs 1--1.91 (0.26, 13.88)0.521.90 (0.25, 14.19)0.53
> 3 vs 1--3.63 (0.49, 26.74)0.212.38 (0.31, 18.46)0.41
≥ 3 vs 22.01 (1.33, 3.05)< 0.001a----
Anesthesia type
Other vs general2.92 (0.66, 12.85)0.160.89 (0.43, 1.82)0.74--
Surgery length1.00 (1.00, 1.01)0.101.00 (0.99, 1.01)0.551.00 (1.00, 1.00)<0.001a
Atrial fibrillation, present on admission0.97 (0.53, 1.77)0.911.93 (1.32, 2.81)<0.001a2.19 (1.09, 4.41)0.03a
Pressure ulcers, present on admission0.65 (0.08, 5.05)0.68--7.56 (1.89, 30.24)0.004a
Opioid dependence or long-term use7.11 (3.26, 15.51)< 0.001a2.98 (1.38, 6.41)0.005a1.88 (0.91, 3.90)0.09
Parenteral diazepam5.05 (1.5, 16.97)0.009a4.40 (1.52, 12.75)0.007a2.17 (1.19, 3.97)0.01a
Elixhauser comorbidity
Deficiency anemias1.64 (0.74, 3.63)0.221.10 (0.57, 2.11)0.781.11 (0.42, 2.93)0.83
Congestive heart failure2.35 (0.93, 5.96)0.071.59 (0.74, 3.38)0.231.54 (0.39, 6.11)0.54
Rheumatoid arthritis/collagen vascular diseases1.06 (0.45, 2.51)0.9000.35 (0.13, 0.94)0.04a1.02 (0.49, 2.13)0.95
Chronic pulmonary disease1.13 (0.67, 1.92)0.640.84 (0.55, 1.28)0.411.06 (0.65, 1.73)0.82
Coagulopathy1.32 (0.39, 4.53)0.661.60 (0.70, 3.62)0.262.80 (1.05, 7.50)0.04a
Depression1.70 (1.05, 2.75)0.03a1.47 (1.02, 2.11)0.04a2.61 (1.73, 3.92)<0.001a
Diabetes w/o chronic complications1.54 (0.90, 2.64)0.121.90 (1.36, 2.66)< 0.001a1.54 (0.92, 2.58)0.10
Diabetes w chronic complications2.05 (0.45, 9.23)0.351.77 (0.68, 4.58)0.243.34 (1.02, 10.91)0.046a
Hypertension1.62 (1.06, 2.48)0.03a1.21 (0.59, 1.64)0.231.00 (0.66, 1.51)0.99
Hypothyroidism1.01 (0.61, 1.66)0.981.46 (1.06, 2.02)0.02a1.07 (0.65, 1.76)0.80
Liver disease0.41 (0.05, 3.22)0.400.70 (0.16, 3.07)0.630.71 (0.15, 3.30)0.66
Lymphoma1.33 (0.25, 7.20)0.74----
Fluid and electrolyte disorders0.31 (0.04, 2.43)0.261.41 (0.44, 4.56)0.571.14 (0.36, 3.63)0.82
Other neurological disorders2.04 (0.98. 4.27)0.062.79 (1.69, 4.60)< 0.001a2.14 (1.10, 4.14)0.02a
Obesity1.06 (0.53, 2.12)0.880.79 (0.53, 1.19)0.271.56 (0.90, 2.69)0.11
Peripheral vascular disorders1.20 (0.47, 3.10)0.701.40 (0.62, 3.16)0.421.68 (0.64, 4.42)0.30
Psychoses2.52 (0.81, 7.90)0.116.39 (3.51, 11.62)< 0.001a4.95 (2.38, 10.28)<0.001a
Pulmonary circulation disorders1.20 (0.47, 3.10)0.701.69 (0.89, 3.23)0.111.57 (0.51, 4.88)0.44
Renal failure0.94 (0.41, 2.15)0.882.32 (1.31, 4.11)0.004a0.97 (0.39, 2.45)0.95
Solid tumor w/o metastasis--1.42 (0.31, 6.45)0.65--
Valvular disease1.08 (0.59, 1.97)0.801.23 (0.79, 1.92)0.371.17 (0.61, 2.26)0.63
Weight loss0.61 (0.05, 7.46)0.707.14 (0.62, 82.11)0.11--