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Does idiopathic normal pressure hydrocephalus always mean a poor prognosis?
Michael Kiefer1, Ulrich Meier, Regina Eymann
1Department of Neurosurgery, Saarland University Medical School, Homburg-Saar, Germany. Michael.Kiefer@uks.eu
Acta Neurochirurgica. Supplement
|October 9, 2009
Summary
Idiopathic normal-pressure hydrocephalus (iNPH) does not inherently indicate a worse prognosis. Favorable preconditions in iNPH patients can lead to outcomes similar to or better than other hydrocephalus types.
Area of Science:
- Neurosurgery
- Neurology
- Medical Research
Background:
- Idiopathic normal-pressure hydrocephalus (iNPH) is often perceived to have a poorer prognosis compared to other forms of hydrocephalus.
- Assessing prognostic factors is crucial for effective patient management and treatment strategies.
Purpose of the Study:
- To evaluate if idiopathic normal-pressure hydrocephalus (iNPH) carries a worse prognosis than other hydrocephalus subtypes.
- To identify factors influencing the prognosis of iNPH patients post-shunting.
Main Methods:
- A cohort of 125 patients with chronic hydrocephalus (75 iNPH, 50 non-iNPH) underwent shunting with gravitational valves.
- Clinical status was assessed using the clinical grading (KI) and comorbidity index (CMI).
- Statistical analyses included Spearman, Kruskal-Wallis, ANOVA, chi(2), and Wilcoxon U tests (p < 0.05).
Main Results:
- Shunt responder rates were 72% for iNPH and 86% for non-iNPH.
- iNPH patients with shorter disease duration or lower preoperative KI showed outcomes comparable to or better than non-iNPH patients.
- A low comorbidity index (CMI ≤3) in iNPH patients correlated with an 86% improvement rate, versus 64% in non-iNPH patients with higher CMI.
Conclusions:
- The diagnosis of iNPH alone does not predict a worse prognosis.
- Favorable preconditions, such as shorter disease duration and lower comorbidity, can lead to similar or better outcomes in iNPH patients compared to other hydrocephalus types.
- Worse overall outcomes in iNPH are often attributed to delayed diagnosis and more severe comorbidities.
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