Development of Excised Larynx.
Rong Luo, Weijia Kong, Xin Wei and 2 others
PMID 30262190WHAT IT FOUND
This review summarizes how excised larynx models clarify voice mechanics.
It reports that freezing causes 5% geometric distortion. It notes that vocal fold disorders raise the minimum power needed for phonation. These findings explain laboratory mechanisms but do not prove clinical treatment effects.
Key findings
01Freezing porcine larynges for study causes about 5% geometric distortion compared to fresh tissue.
02Vocal fold disorders significantly increase the minimum aerodynamic power required to sustain phonation, and removing polyps lowers this requirement.
03Observations made in excised larynx models are only valid for the excised situation and must be combined with animal and clinical records.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The review summarizes basic laboratory research using excised tissue, not clinical trials with living patients. The authors explicitly state that findings from excised larynges are only valid for the excised situation and cannot be directly applied to in vivo physiology without combining other data. The review does not report effect sizes for clinical treatments or patient outcomes. Species differences, such as the lack of a defined break between true and false vocal folds in sheep, limit the generalizability of animal model findings to humans.
The easy way to misread this
Do not interpret these mechanical findings as evidence that specific surgical or therapeutic interventions work in patients. The review focuses on excised tissue, and the authors state that these observations are only valid for the excised situation.