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Table 1 Parameters, distinctive for normal pressure hydrocephalus

From: Is posture-related craniospinal compliance shift caused by jugular vein collapse? A theoretical analysis

Parameter Symbol Value Unit Reference
Elastance \(E\) 0.23 mL−1 [9, 16]*
Exponential parameter \(p_{1}\) 4 mmHg [16]*
Offset pressure \(p_{0}\) 3.2 mmHg [16]*
Rate of CSF formation \(Q_{form}\) 0.35 mL/min [13]
Total CSF outflow resistance \(R_{abs}^{tot}\) 20.6 mmHg/(mL/min) [13, 16]*
Relative spinal compliance \(k_{V}\) 0.35 [17]
Spinal venous pressure \(p_{v}^{s}\) 5.3 mmHg [4]
Distance between spinal and cranial reference points \(l_{sc}\) 33.8 cm [4]
Distance between jugular veins and cranial reference point \(l_{jug}\) 11.0 cm [4]
Density of CSF \(\rho_{CSF}\) 1000 kg/m3  
Density of blood \(\rho_{blood}\) 1060 kg/m3  
Gravitational acceleration \(g\) 9.81 m/s2  
Relative spinal outflow conduction \(k_{R}\) n/a#  
  1. * Computed from data given in the referenced work: \(E = \ln \left( {RPPC + 1} \right)/\Delta V_{a}\) [18], \(p_{1} = ICP_{r} - p_{0} - p_{v}^{s}\), \(p_{0} = p_{0}^{M} - p_{v}^{s}\), \(R_{abs}^{tot} = (ICP_{r} - p_{v}^{s} )/Q_{form}\) [3]
  2. # The value of this parameter is unknown. It is estimated in this study