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Life sciences · Journal article
Clinical Neurology and Neurosurgery · June 25, 2026
Reinforces what was already believed, rather than introducing something new.
This systematic review of 19 studies found that global shunt response was directionally lower in complex iNPH (coexisting neurodegenerative or vascular disease) compared to pure iNPH, but the difference did not reach statistical significance (OR 0.31, 95% CI 0.09–1.10 from 3 direct comparisons). The evidence is of low-to-very-low certainty, with substantial heterogeneity and imprecision, particularly for continuous outcomes; however, the finding does not indicate absence of response in complex cases.
Systematic review and meta-analysis. Patients with idiopathic normal pressure hydrocephalus undergoing cerebrospinal fluid shunting, classified as pure iNPH or complex iNPH (with coexisting neurodegenerative or vascular disease).. Intervention: Cerebrospinal fluid shunting in complex iNPH (coexisting neurodegenerative or vascular disease).. Compared with: Cerebrospinal fluid shunting in pure iNPH..
Global shunt response: OR 0.31 (95% CI 0.09–1.10) in complex versus pure iNPH, not statistically significant, based on 3 direct comparative studies Urinary improvement did not clearly differ between phenotypes: OR 0.85 (95% CI 0.58–1.25) from 3 studies Within complex iNPH, cognition showed directional improvement, gait was near null with marked heterogeneity, and incontinence showed small positive effect
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Clinicians should counsel patients with complex iNPH that shunt response is possible but carries greater uncertainty than in pure iNPH. Domain-specific counseling is warranted when Alzheimer-related biomarkers, parkinsonism, vascular burden, or other neurodegenerative features coexist with iNPH, as global response rates may be lower but individual outcomes remain variable.
Systematic review and meta-analysis of 19 studies showing low-to-very-low-certainty evidence that complex iNPH has greater uncertainty and possibly lower global shunt response than pure iNPH, but response remains clinically meaningful in both groups.
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Quoted from the source exactly as published.
Clinicians should counsel patients with complex iNPH that shunt response is possible but carries greater uncertainty than in pure iNPH. Domain-specific counseling is warranted when Alzheimer-related biomarkers, parkinsonism, vascular burden, or other neurodegenerative features coexist with iNPH, as global response rates may be lower but individual outcomes remain variable.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Background. Idiopathic normal pressure hydrocephalus (iNPH) frequently coexists with neurodegenerative or vascular disease, but shunt outcomes in these complex presentations remain poorly synthesized.Methods. We performed a Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) 2020 systematic review and meta-analysis of shunt outcomes in pure iNPH and complex iNPH. Binary outcomes were global shunt response and urinary improvement. Continuous outcomes were harmonized into cognition, gait, general function, and incontinence and summarized as standardized mean change with raw-score standardization (SMCR). Prespecified primary comparative estimates used random-effects models with Hartung-Knapp confidence intervals (CIs).Results. Nineteen unique analytical studies were included. In direct head-to-head binary comparisons, global shunt response was directionally lower in complex iNPH but did not reach statistical significance under the prespecified random-effects Hartung-Knapp model (odds ratio [OR] 0.31, 95% CI 0.09-1.10; k = 3). Urinary improvement did not clearly differ between phenotypes (OR 0.85, 95% CI 0.58-1.25; k = 3). Within complex iNPH, continuous pre-post estimates varied by domain and were imprecise: cognition was directionally positive, gait was near null with marked heterogeneity, and incontinence showed a small positive estimate. Direct continuous complex-minus-pure comparisons did not show a consistent deficit across domains. Exploratory time meta-regression suggested a phenotype-by-time interaction for incontinence, but this signal was based on sparse follow-up support and should be considered hypothesis-generating.Conclusions. Low- to very-low-certainty evidence suggests that complex iNPH is associated with greater uncertainty and possibly lower global response than pure iNPH, but lower odds of response should not be interpreted as absence of response. Counseling should be phenotype-aware and domain-specific, particularly when Alzheimer-related biomarkers, parkinsonism, vascular burden, or other neurodegenerative features coexist with suspected iNPH.
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