J Neurol Res

Journal of Neurology Research, ISSN 1923-2845 print, 1923-2853 online, Open Access

Article copyright, the authors; Journal compilation copyright, J Neurol Res and Elmer Press Inc

Journal website http://www.neurores.org

Original Article

Volume 10, Number 5, October 2020, pages 177-182

Impact of Cervical Collar and Patient Position on the Cerebral Blood Flow

Figure

Figure 1. The study design with a sensor that is adhered to the skin. The monitor was applied to assess the changes of blood flow to the brain: before and after application of several c-collars, as the patient positions change from supine (with and without LSB), and as the head of the bed is elevated. c-collar: cervical collar; LSB: long spinal board.

Tables

**Table 1.** Subject Demographics
Subject	Gender	Age (years)	BMI	Neck circumference (cm)
BMI: body mass index; M: male; F: female; SD: standard deviation; CI: confidence interval.
1	M	61	35.4	46
2	F	65	29.0	38
3	M	27	24.3	38.25
4	M	46	29.3	41
5	F	46	29.0	37.5
Mean (SD, 95% CI)		49 (15, 30 - 68)	29.4 (4, 24 - 34)	40.15

**Table 2.** Cerebral Blood Flow Index as a Function of Head of Bed Position, Dichotomized to Less Than Thirty Degrees, or Greater Than or Equal to Thirty Degrees
Subject	Head of bed
Subject	Mean CBFI	SD	95% CI	P value
CBFI: cerebral blood flow index; SD: standard deviation; CI: confidence interval.
1
< 30°	84.9	5.5	82.9 - 86.9	0.0001
≥ 30°	71.4	3.7	70.0 - 72.7
2
< 30°	81.1	8	78.5 - 83.8	0.004
≥ 30°	76.6	4	75.2 - 78.0
3
< 30°	61.7	5.3	59.3 - 64.2	0.0005
≥ 30°	55.1	8.3	52.6 - 57.6
4
< 30°	75.5	6	71.7 - 79.3	0.0001
≥ 30°	67.9	5	66.4 - 69.4
5
< 30°	59.7	6	57.2 - 62.1	0.0001
≥ 30°	69.7	4.3	68.3 - 71.1

**Table 3.** Comparing Cerebral Blood Flow Index With and Without C-Collar
Subject	Mean CBFI	SD	95% CI	P value
C-collar: cervical collar; CBFI: cerebral blood flow index; SD: standard deviation; CI: confidence interval.
1
+	78.3	8.1	75.6 - 80.9	0.88
-	77.9	8.6	74.5 - 81.4
2
+	79.5	7.2	76.9 - 82.1	0.65
-	78.7	6.6	76.6 - 80.9
3
+	58.2	2.5	57.3 - 59.0	0.30
-	56.0	11	52.0 - 60.0
4
+	72.8	6.7	70.2 - 75.5	0.0004
-	67.0	4.0	65.5 - 68.4
5
+	66.1	6.9	63.6 - 68.6	0.66
-	65.3	7.3	62.7 - 67.9