Efficacy and Safety of "Vacuum Swallowing" Based on a Strong Negative Esophageal Pressure in Healthy Individuals.
Kenjiro Kunieda, Saori Suzuki, Satoe Naganuma and 6 others
PMID 39153047WHAT IT FOUND
Healthy adults successfully reproduced vacuum swallowing, generating strong negative pressure in the esophagus.
While no choking occurred, inspiration during swallowing was frequent. This technique remains untested in dysphagia patients, so clinical application requires further study.
Key findings
01Ten healthy participants successfully reproduced vacuum swallowing, generating significantly lower minimum esophageal pressure and higher lower esophageal sphincter pressure compared to normal swallowing.
02During vacuum swallowing, the inspiration-swallow-expiration breathing pattern occurred in 38.9% of swallows, compared to 16.7% during normal swallowing.
03Two participants experienced mild coughing during vacuum swallowing, but no other adverse events or choking on water were recorded.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study only included healthy individuals, so it does not demonstrate efficacy or safety for patients with dysphagia. The sample size was small (10 analyzed), limiting the generalizability of the findings. The study did not use videofluoroscopy to directly confirm the absence of penetration or aspiration during vacuum swallowing. Two participants dropped out due to catheter intolerance, which may affect the feasibility of this measurement method in clinical populations.
Declared interests
Funding was provided by Gifu University. No other conflicts of interest were declared.
The easy way to misread this
Do not assume vacuum swallowing is safe or effective for dysphagia patients based on this study. The high rate of inspiration during swallowing in healthy adults suggests a risk of aspiration that was not directly measured by imaging in this trial.