Article Figures & Data
Figures
- Fig 1.
A, Boxplots depict the distribution of craniospinal elastance by increasing opening pressure. B, Scatterplot demonstrates Ecs as a function of opening pressure using opening pressure as a continuous measure. The black line represents the linear regression model. C, Scatterplot demonstrates the inverse of elastance, which demonstrates the nonlinear relationship between the volume of CSF required to change the intracranial pressure as the opening pressure changes.
- Fig 2.
A, Boxplots depict the distribution of the pressure-volume index by increasing opening pressure. B, Scatterplot demonstrates PVI as a function of opening pressure using opening pressure as a continuous measure. The solid line represents the linear regression model.
Tables
Ecs and PVI for covariate groupsa
No. Ecs PVI Slope ± SEM Correlation Coefficient Slope ± SEM Correlation Coefficient Age group (yr) Younger than 30 39 0.34 ± 0.04 0.89 (0.79–0.94) −20.1 ± 5.9 −0.48 (−0.69 to −0.20) 30–39 44 0.27 ± 0.05 0.67 (0.47–0.81) −13.0 ± 7.0 −0.35 (−0.58 to −0.06) 40–49 24 0.28 ± 0.06 0.59 (0.25–0.80) −10.5 ± 8.5 −0.24 (−0.59 to −0.18) 50 and olderb 9 0.10 ± 0.08 0.31 (−0.44–0.81) 10.6 ± 11.7 0.20 (−0.54 to 0.76) BMI group (kg/m2) < 30 8 0.44 ± 0.14 0.57 (−0.23–0.91) −19.1 ± 19.6 −0.62 (−0.92 to 0.14) 30–39 20 0.20 ± 0.07 0.60 (0.21–0.82) −2.7 ± 9.3 −0.11 (−0.53 to 0.35) 40–49 34 0.29 ± 0.05 0.79 (0.62–0.89) −16.4 ± 6.3 −0.33 (−0.60 to 0.01) ≥50 12 0.20 ± 0.08 0.67 (0.16–0.90) −1.6 ± 10.5 −0.08 (−0.63 to 0.51) Race group Black 70 0.27 ± 0.04 0.69 (0.54–0.80) −12.5 ± 5.3 −0.32 (−0.52 to −0.10) White 39 0.28 ± 0.04 0.66 (0.44–0.81) −11.8 ± 6.2 −0.24 (−0.52 to 0.08) Procedural sedation group Yes 46 0.28 ± 0.05 0.60 (0.37–0.76) −19.0 ± 6.5 −0.32 (−0.56 to −0.04) No 70 0.28 ± 0.03 0.77 (0.66–0.85) −10.2 ± 4.5 −0.34 (−0.53 to −0.11) CSF volume removed (mL) <20 27 0.38 ± 0.06 0.64 (0.34–0.82) −14.0 ± 10.3 −0.27 (−0.59 to 0.12) 20.0–24.9 27 0.37 ± 0.05 0.79 (0.59–0.90) −8.6 ± 8.8 −0.18 (−0.53 to 0.21) 25.0–29.9 30 0.38 ± 0.05 0.87 (0.75–0.94) −18.3 ± 8.7 −0.53 (−0.75 to −0.21) ≥30 32 0.29 ± 0.04 0.90 (0.80–0.95) −18.9 ± 6.2 −0.41 (−0.67 to −0.08) Note:—SEM indicates standard error of the mean.
↵a The slope indicates the average change in the measure for a 1 cm H2O change in opening pressure. The Pearson correlation coefficient reflects the correlation between the measure and opening pressure.
↵b Comparing 50 years and older with younger than 30 years (P = .01), 30–39 years (P = .09), and 40–49 years (P = .08).
Jump to section
Related Articles
Cited By...
- Relationship of Bern Score, Spinal Elastance, and Opening Pressure in Patients With Spontaneous Intracranial Hypotension
- Spinal Compliance Curves: Preliminary Experience with a New Tool for Evaluating Suspected CSF Venous Fistulas on CT Myelography in Patients with Spontaneous Intracranial Hypotension