Estimation of optic nerve sheath diameter on an initial brain computed tomography scan can contribute prognostic information in traumatic brain injury patients

Table 2 The main brain CT scan and clinical biochemical parameters in survivors and non-survivors.

	Survivors	Non-survivors	P value
	( n = 55)	( n = 22)
Initial CT scan
Basal cistern compression	7 (13%)	15 (68%)	< 0.001
Midline shift ≥ 5 mm	17 (31%)	13 (59%)	0.04
Cortical sulcus effacement	26 (47%)	20 (91%)	< 0.001
Intraventricular haemorrhage	8 (15%)	5 (22%)	0.5
Subarachnoid haemorrhage	23 (42%)	15 (68%)	0.04
Marshall score	3 [5]	5 [3]	0.22
Optic nerve sheath diameter (mm)	6.8 ± 0.1	7.8 ± 0.1	< 0.001
Clinical biochemical parameters
Serum sodium (mmol.l^-1)	139 ± 4	138 ± 5	0.51
Glycaemia (mmol.l^-1)	7.3 [2.5]	8.9 [4.6]	0.008
PaO₂/FiO₂	332 [126]	174 [118]	0.13
PaCO₂ (mmHg)	38.4 [9.9]	40.5 [10.5]	0.69
Haemoglobin (g.dl^-1)	13.0 [2.8]	12.8 [3.3]	0.68

Results are presented as number (proportion), mean ± standard deviation or median [interquartile range] according to the normality of distribution. CT, computed tomography.

ISSN: 1364-8535