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Silent aspiration: what do we know?

Deborah Ramsey1, David Smithard, Lalit Kalra

  • 1Guy's, King's and St. Thomas' School of Medicine, King's College, London, UK. deborah.ramsey@kcl.ac.uk

Dysphagia
|December 20, 2005
PubMed
Summary
This summary is machine-generated.

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Silent aspiration, often unnoticed in swallowing difficulties, affects 2%-25% of stroke patients. Further research is needed to understand its prevalence and impact on health outcomes.

Area of Science:

  • Neurology
  • Gastroenterology
  • Speech-Language Pathology

Background:

  • Clinically evident aspiration is common in dysphagia.
  • A significant proportion of individuals aspirate silently, lacking outward signs.
  • Silent aspiration is poorly understood, necessitating further investigation.

Purpose of the Study:

  • To review the literature on silent aspiration.
  • To examine its prevalence, etiology, and prognostic significance.
  • To highlight the challenges in detection and comparison across studies.

Main Methods:

  • Electronic database search using terms: silent aspiration, aspiration, dysphagia, stroke.
  • Hand-searching of relevant articles.
  • Review of existing literature on detection methods and patient subgroups.

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Main Results:

  • Silent aspiration occurs in various conditions, including normal individuals.
  • Prevalence in acute stroke ranges from 2% to 25%.
  • Associated mechanisms include pharyngeal weakness, reduced sensation, impaired cough reflex, and altered neurotransmitter levels.

Conclusions:

  • Silent aspiration is linked to increased morbidity and mortality in many studies.
  • Some nocturnal silent aspiration may be normal in healthy individuals.
  • Improved detection methods are crucial for defining prevalence and prognostic significance.