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Journal Club

General Neurosurgery

Diagnosis and management of idiopathic normal-pressure hydrocephalus.

Neurol Clin Pract | 2013

Rapid review note

Journal Club is a rapid, AI-assisted appraisal layer. It highlights study design, effect estimates, and practice relevance, but it is still a briefing, not a replacement for the paper.

For education only. Not medical advice.

Paper snapshot

Rapid study overview

Open paper

DOI

10.1212/CPJ.0b013e3182a78f6b

PMID

24175154

PICO

Population

Elderly patients with suspected idiopathic normal-pressure hydrocephalus (iNPH) presenting with gait impairment, incontinence, and dementia.

Intervention

Organized diagnostic evaluation including clinical assessment, neuroimaging, and specific iNPH testing (e.g., large-volume lumbar puncture, CSF drainage).

Comparator

No formal comparator; this is a clinical practice guideline.

Outcomes

Diagnostic accuracy, prediction of shunt responsiveness, symptomatic improvement after shunt surgery.

Design

Type

Clinical practice guideline/expert review

Randomized

No

Multicenter

N/A

Blinded

N/A

Follow-up

N/A

Primary endpoint

Not applicable: this is a guideline review without defined study endpoints.

Secondary endpoints

  • Not applicable: guideline review

Practice impact

What this means

This 2013 guideline review outlines a stepwise approach to iNPH diagnosis: comprehensive clinical evaluation, treatment of comorbidities, then specific CSF drainage testing. It emphasizes that gait impairment is nearly universal, and properly performed tap tests (30-50 mL removal with pre/post assessment) have high positive predictive value. All symptoms including dementia may improve with shunting in selected patients.

Bottom line

Provides structured diagnostic approach for iNPH emphasizing comprehensive evaluation before shunt consideration.

Strength of evidence

low

Recommendation

do not change

Why it matters

  • Expert review without original data
  • Reiterates existing guideline recommendations
  • No new evidence to alter practice

What would change my mind

  • Randomized trial comparing diagnostic protocols
  • Prospective validation of DESH criteria
  • Systematic review with meta-analysis of test accuracy

Critical appraisal

How strong is the paper?

Methods critique

Risk of bias

High risk: expert opinion and guideline synthesis without systematic review methodology or quality assessment.

Confounding

Not addressed: narrative review does not control for confounding variables.

Missing data

Not applicable: guideline review without patient-level data.

Multiplicity

Not applicable: no statistical testing performed.

Notes

  • Based on International and Japanese iNPH guidelines
  • No original data collection or analysis

Stats check

NNT

N/A

Effect sizes

  • Evans ratio threshold ≥0.3 or ≥0.33 for ventriculomegaly
  • Callosal angle ≤90° on coronal MRI

Absolute effects

  • Tinetti score improved from 12-16/28 to 26/28 in case example
  • CSF removal volume 30-50 mL for tap test

Concerns

  • No comparative statistics
  • Case example only
  • Guideline recommendations without effect size estimates

External validity

Who it applies to

Elderly patients with suspected iNPH and ventriculomegaly.

Who it does not

Patients with secondary hydrocephalus from known causes (e.g., SAH, trauma), pure dementia or incontinence without gait impairment, or lateralizing neurologic findings.

Generalizability notes

  • Based on consensus guidelines
  • Clinical practice patterns may vary
  • Case example from single center

Evidence trace

Source trace and metadata

Citations (3)

claim_id

methods_critique.risk_of_bias

locator

p. 375 Summary

quote

incorporates an organized approach using familiar principles for neurologists

claim_id

stats_check.effect_sizes

locator

p. 378 Neuroimaging

quote

The International and Japanese guidelines use a threshold of ≥0.3, but research on normal elderly subjects suggests a threshold of ≥0.33

claim_id

practice_impact.bottom_line

locator

p. 376 Clinical evaluation

quote

The goal of the evaluation of possible iNPH is to predict whether shunt surgery is likely to benefit the patient sufficiently to justify the risks

Metadata

Generated at

2026-03-06T13:41:29.251Z

Version

top 100 cited in past 20 years