Table 3.

Multivariate analysis of risk factors for cardiac arrest following primary TKA

Condition	Odds Ratio	95% CI	P-value
Bleeding disorder	2.05	1.06–3.98	0.034
Anemia	2.08	1.42–3.05	<0.001
Platelet <150 k	0.97	0.50–1.88	0.927
Operative time 70–86 min	0.80	0.51–1.26	0.337
Operative time 86–107 min	0.78	0.49–1.22	0.273
Operative time >107 min	0.77	0.49–1.21	0.260
Admission Quarter 2	0.65	0.40–1.06	0.085
Admission Quarter 3	0.77	0.48–1.22	0.261
Admission Quarter 4	1.06	0.69–1.63	0.778
Perioperative transfusion	3.03	1.90–4.83	<0.001
Age 60-67	1.41	0.80–2.49	0.239
Age 67-73	1.67	0.94–2.96	0.082
Age 73+	2.58	1.50–4.45	<0.001
Diabetes	1.11	0.75–1.64	0.599
Dyspnea with Moderate Exertion	1.66	1.01–2.72	0.046
Cardiac Comorbidities	1.57	1.00–2.47	0.048
Dialysis	4.05	0.97–16.9	0.055
Steroid/Immunosuppressant use	1.17	0.54–2.52	0.689
BMI <18.5	4.74	0.60–37.4	0.140
BMI 24.9–29.9	1.81	0.58–2.42	0.650
BMI 29.9+	1.69	0.86–3.32	0.127
Male Sex	1.23	0.87–1.73	0.246
Pulmonary Comorbidities	3.74	2.31–6.05	<0.001
Smoking status	0.76	0.38–1.54	0.453

Multivariate Analysis of Preoperative and Perioperative Risk Factors for cardiac arrest following Primary Total Knee Arthroplasty (TKA). Preoperative blood transfusions and dyspnea at rest are not reported in the table because they had an odds ratio and confidence interval of 0. This is because no patients with these comorbidities experienced cardiac arrest following TKA.