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Related Experiment Video

Updated: Jun 6, 2026

The Application of Point-of-Care Ultrasonography (POCUS) in the Management of Acute Respiratory Distress Syndrome (ARDS) in the Intensive Care Unit

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Published on: December 12, 2025

Silent aspiration risk is volume-dependent.

Steven B Leder¹, Debra M Suiter, Barry G Green

¹Department of Surgery, Section of Otolaryngology, Yale University School of Medicine, P.O. Box 208041, New Haven, CT 06520-8041, USA. steven.leder@yale.edu

|November 11, 2010

Summary

A larger 3-ounce (90-cc) water swallow challenge can improve detection of silent aspiration, a condition often missed by standard clinical swallow protocols. This method helps identify more individuals at risk by eliciting a cough reflex, reducing false negatives in aspiration screening.

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Area of Science:

Clinical Medicine
Swallowing Disorders
Diagnostic Tools

Background:

Silent aspiration, lacking overt signs, is often undetected by standard clinical swallow protocols.
A need exists for swallow screening methods with high sensitivity for aspiration risk and low false-negative rates for silent aspiration.

Purpose of the Study:

To determine if silent aspiration risk is volume-dependent.
To investigate the efficacy of a 3-oz. (90-cc) water swallow challenge in eliciting cough responses in individuals with silent aspiration.

Main Methods:

A prospective study involving 4102 inpatients.
Silent aspiration was initially assessed via fiberoptic endoscopy.
Participants then underwent a 3-oz. (90-cc) water swallow challenge, with failure defined by inability to consume, interruptions, or coughing/choking.

Main Results:

The 3-oz. water swallow challenge improved identification of aspiration risk in 58% of participants with silent aspiration.
Additional silent aspirators identified included 48% of liquid aspirators and 65.6% of puree aspirators.
The overall false-negative rate was ≤2.0%, with a combined rate of 6.9% for those with confirmed silent aspiration.

Conclusions:

Silent aspiration risk is volume-dependent, with larger bolus volumes potentially triggering a cough reflex.
The 3-oz. water swallow challenge demonstrates high sensitivity and a low false-negative rate for identifying aspiration risk, including silent aspiration.