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Table 2 The CSFP pulse during lumbar puncture versus ICP pulse during over-night ICP monitoring

From: Cerebrospinal fluid pulse pressure amplitude during lumbar infusion in idiopathic normal pressure hydrocephalus can predict response to shunting

Over-night ICP monitoring* Lumbar puncture
ICP wave amplitude CSFP wave amplitude during opening phase CSF wave amplitude during lumbar infusion
  < 2 mmHg ≥ 2 mmHg < 4 mmHg ≥ 4 mmHg
< 4 mmHg (n = 20) 17 3 12 8
≥ 4 mmHg (n = 42) 17 25 5 37
Statistics Sensitivity = 60; Specificity = 85 PPV = 89; NPV = 50 Sensitivity = 88; Specificity = 60 PPV = 82; NPV = 71
  1. *Mean ICP wave amplitude from the period 11 p.m. to 7 a.m.