Impact of duration of symptoms on CSF dynamics in idiopathic normal pressure hydrocephalus.
Summary of "Impact of duration of symptoms on CSF dynamics in idiopathic normal pressure hydrocephalus."
Czosnyka Z, Owler B, Keong N, Santarius T, Baledent O, Pickard JD, Czosnyka M. Impact of duration of symptoms on CSF dynamics in idiopathic normal pressure hydrocephalus.
Acta Neurol Scand:
10.1111/j.1600-0404.2010.01420.x. © 2010 John Wiley & Sons A/S. 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.
Neurosurgical Unit, Department of Clinical Neurosciences, University of Cambridge, UK Department of Neurosurgery, The University of Sydney, New South Wales, Australia Department of Imaging and Biophysics, Amiens University Hospital, Amiens Cedex, France.
This article was published in the following journal.
Name: Acta neurologica Scandinavica
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20849400
- DOI: http://dx.doi.org/10.1111/j.1600-0404.2010.01420.x
Medical and Biotech [MESH] Definitions
Hydrocephalus, Normal Pressure
A form of compensated hydrocephalus characterized clinically by a slowly progressive gait disorder (see GAIT DISORDERS, NEUROLOGIC), progressive intellectual decline, and URINARY INCONTINENCE. Spinal fluid pressure tends to be in the high normal range. This condition may result from processes which interfere with the absorption of CSF including SUBARACHNOID HEMORRHAGE, chronic MENINGITIS, and other conditions. (From Adams et al., Principles of Neurology, 6th ed, pp631-3)
Pressure within the cranial cavity. It is influenced by brain mass, the circulatory system, CSF dynamics, and skull rigidity.
Stress Disorders, Traumatic
Anxiety disorders manifested by the development of characteristic symptoms following a psychologically traumatic event that is outside the normal range of usual human experience. Symptoms include re-experiencing the traumatic event, increased arousal, and numbing of responsiveness to or reduced involvement with the external world. Traumatic stress disorders can be further classified by the time of onset and the duration of these symptoms.
Stress Disorders, Post-traumatic
A class of traumatic stress disorders with symptoms that last more than one month. There are various forms of post-traumatic stress disorder, depending on the time of onset and the duration of these stress symptoms. In the acute form, the duration of the symptoms is between 1 to 3 months. In the chronic form, symptoms last more than 3 months. With delayed onset, symptoms develop more than 6 months after the traumatic event.
A condition characterized by neck stiffness, headache, and other symptoms suggestive of meningeal irritation, but without actual inflammation of the meninges (MENINGITIS). Spinal fluid pressure may be elevated but spinal fluid is normal. (DeJong, The Neurologic Examination, 4th ed, p673)
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