. Author manuscript; available in PMC: 2013 Nov 11.

Published in final edited form as: J Neurosurg Spine. 2010 Dec;13(6):10.3171/2010.6.SPINE10200. doi: 10.3171/2010.6.SPINE10200

TABLE 3. Cerebrospinal fluid velocity measurements in the subarachnoid space and syrinx before and after surgery in 14 patients and in 18 volunteers^*.

	Patients			Healthy Volunteers
Feature	Measurement Before Revision	Measurement 1 Wk Postop	Measurement 3–6 Mos Postop	Measurement
FM ventral SAS

peak velocity inf direction (systole)	1.60 ± 1.06^†	1.07 ± 0.53	1.40 ± 0.62^†	0.80 ± 0.42
peak velocity sup direction (diastole)	−1.52 ± 0.93^†	−1.18 ± 0.54	−1.43 ± 0.60^†	−0.84 ± 0.50
sup-inf velocity change	3.12 ± 1.86^†	2.26 ± 0.94	2.83 ± 0.94^†	1.64 ± 0.85

FM dorsal SAS

peak velocity inf direction (systole)	0.22 ± 0.24	0.43 ± 0.18	0.32 ± 0.45	0.33 ± 0.26
peak velocity sup direction (diastole)	−0.40 ± 0.35	−0.32 ± 0.10	−0.45 ± 0.56	−0.51 ± 0.44
sup-inf velocity change	0.63 ± 0.41	0.76 ± 0.23	0.77 ± 0.54	0.84 ± 0.50

FM entire SAS

peak velocity inf direction (systole)	1.04 ± 0.83^†	0.70 ± 0.33	0.70 ± 0.52	0.49 ± 0.28
peak velocity sup direction (diastole)	−1.06 ± 0.72^†	−0.71 ± 0.32	−0.64 ± 0.36	−0.59 ± 0.43
sup-inf velocity change	2.10 ± 1.47^†	1.41 ± 0.61	1.33 ± 0.71	1.09 ± 0.61

syrinx

peak velocity inf direction (systole)	1.69 ± 1.37	1.06 ± 0.91	0.56 ± 0.71^‡	NA
peak velocity sup direction (diastole)	−0.95 ± 0.63	−0.89 ± 1.09	−0.35 ± 0.49^‡	NA
sup-inf velocity change	2.63 ± 1.82	1.95 ± 1.60	0.90 ± 1.17^‡	NA

C5–6 ventral SAS

peak velocity inf direction (systole)	1.94 ± 1.19	1.62 ± 0.78	2.26 ± 1.40	2.41 ± 1.04
peak velocity sup direction (diastole)	−1.52 ± 1.04	−1.32 ± 0.78	−1.61 ± 0.73	−1.37 ± 0.67
sup-inf velocity change	3.45 ± 2.12	2.94 ± 1.42	3.87 ± 1.27	3.78 ± 1.53

C5–6 dorsal SAS

peak velocity inf direction (systole)	0.74 ± 0.68	0.63 ± 0.68	1.24 ± 1.27	1.26 ± 1.20
peak velocity sup direction (diastole)	−0.46 ± 0.33^†	−0.48 ± 0.43	−0.86 ± 0.68	−0.93 ± 0.67
sup-inf velocity change	1.19 ± 0.92	1.12 ± 1.05	2.10 ± 1.91	2.19 ± 1.79

C5–6 entire SAS

peak velocity inf direction (systole)	1.37 ± 0.88	1.20 ± 0.67^†	2.02 ± 1.09	1.90 ± 0.90
peak velocity sup direction (diastole)	−1.05 ± 0.76	−0.92 ± 0.52	−1.44 ± 0.60	−1.10 ± 0.69
sup-inf velocity change	2.42 ± 1.58	2.11 ± 1.09	3.46 ± 1.59	2.99 ± 1.50

Values expressed as the means ± SDs in centimeter/second. Abbreviations: inf = inferior; SAS = subarachnoid space; sup = superior.

^†

Significant (p < 0.05) when compared with health volunteers (unpaired t-test).

^‡

Significant (p < 0.05) when compared with measurement obtained before revision surgery (paired t-test).

TABLE 3. Cerebrospinal fluid velocity measurements in the subarachnoid space and syrinx before and after surgery in 14 patients and in 18 volunteers*.

TABLE 3. Cerebrospinal fluid velocity measurements in the subarachnoid space and syrinx before and after surgery in 14 patients and in 18 volunteers^*.