Delayed Onset Postoperative Spinal Epidural Hematoma after Lumbar Spinal Surgery: Incidence, Risk Factors, and Clinical Outcomes

Table 2

Laboratory data.

	Group A (early onset)	Group B (delayed onset)	Group C (control group)
Before surgery
Red blood cell (×10^9/L)				0.16	0.31	0.96
Hb (g/L)				0.11	0.63	0.56
HCT				0.38	0.075	0.51
PLT (×10^9/L)				0.42	0.49	0.99
PT (s)				0.66	0.72	0.43
APTT (s)				<0.05	0.56	0.018
TT (s)				0.72	0.06	0.13
Fib (g/L)				0.49	0.97	0.71
INR				0.24	0.67	0.51
Abnormal coagulation (%)	11 (34.35%)	4 (26.7%)	20 (14.18%)	0.007	0.25	0.74
After surgery
Red blood cell (×10^9/L)				0.07	0.67	0.11
Hb (g/L)				<0.05	0.62	0.28
HCT				0.001	0.35	0.005
PLT (×10^9/L)				0.81	0.93	0.95

Values in bold indicates value < 0.05, which is considered as significance difference. Hb: hemoglobin; HCT: hematocrit; PLT: platelet count; PT: prothrombin time; APTT: activated partial thromboplastin time; TT: thrombin time; Fib: fibrinogen; INR: international normalized ratio. Abnormal coagulation was evaluated by platelet count, prothrombin time, and activated partial thromboplastin time according to our laboratory standards.