Pilot Study of Quantitative Methods for Differentiating Pharyngeal Swallowing Mechanics by Dysphagia Etiology.
Yasasvi Tadavarthi, Pouria Hosseini, Stephanie E Reyes and 3 others
PMID 32410203WHAT IT FOUND
Both kinematic analysis and CASM distinguished swallowing mechanics across four dysphagia etiologies.
However, the study was a pilot with too few subjects to draw generalizable conclusions about clinical outcomes.
Key findings
01Kinematic analysis showed significant differences in distance measurements for head and neck cancer patients and timing variables for stroke and head and neck cancer patients compared to controls.
02CASM showed significant differences in swallowing mechanics between each test group and controls, and between the different dysphagia etiologies.
03Kinematic logistic regression found that increased pharyngeal transport time predicted penetration-aspiration in stroke patients, while reduced hyoid excursion predicted it in motor neuron disease patients.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study was a pilot with a very small sample size (10 patients per group), which the authors state is too small to draw generalizable conclusions. Post-hoc power analysis indicated that the study was underpowered, requiring much larger sample sizes (n=60 to n=175 per group) to reliably detect the observed effects. The incidence of penetration-aspiration was very low in some groups (e.g., only one subject in the head and neck cancer group), making it difficult to analyze predictors of aspiration for those etiologies. The study compared two different thick boluses (pudding for most groups, honey for head and neck cancer) which may introduce variability.
The easy way to misread this
Do not interpret these specific kinematic differences as clinically actionable diagnostic markers. The study was explicitly a pilot to test methodology, and the sample size was too small to support generalizable conclusions about patient outcomes.