Impact of duration of symptoms on CSF dynamics in idiopathic normal pressure hydrocephalus.

Abstract:

OBJECTIVE:Cerebrospinal fluid (CSF) pressure-volume compensation may change over time as part of normal ageing, where the resistance to CSF outflow increases and the formation of CSF decreases with age. Is CSF compensation dependent on duration of symptoms in idiopathic normal pressure hydrocephalus (iNPH)? METHODS:We investigated 92 patients presenting with iNPH. Mean age was 73 (range 47-86). There were 60 men and 32 women. They all presented with gait disturbance and ventricular dilatation. Memory deficit occurred in 72% and urinary incontinence in 52% of patients. All patients underwent computerized CSF infusion tests. Sixty-four shunted patients were available for follow-up, and their improvement was expressed using the NPH score. RESULTS:Mean intracranial pressure (ICP) was 10.1±5.1 mmHg, and mean resistance to CSF outflow was 17.3±5.2 mmHg/(ml/min). Mean duration of symptoms was 24±19 months (range from 2 weeks to 86 months). Baseline ICP, magnitude of ICP pulse waveform, brain compliance and improvement after shunting (72% of patients improved) did not exhibit any dependency on the duration of symptoms. The resistance to CSF outflow showed a strong tendency to decrease in time with the duration of symptoms beyond 2 years (R= -0.702; P<0.005). CONCLUSION:This is a preliminary observation, and it suggests that for patients with duration of symptoms longer than 2-3 years, the threshold for normal resistance to CSF outflow should be duration-adjusted.

journal_name

Acta Neurol Scand

authors

Czosnyka Z,Owler B,Keong N,Santarius T,Baledent O,Pickard JD,Czosnyka M

doi

10.1111/j.1600-0404.2010.01420.x

subject

Has Abstract

pub_date

2011-06-01 00:00:00

pages

414-8

issue

6

eissn

0001-6314

issn

1600-0404

journal_volume

123

pub_type

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