Evaluation of a prototype dynamic laryngoplasty system in vitro with an equine vacuum airflow system.
Abstract: To evaluate a prototype dynamic laryngoplasty system (DLPS) in a static airflow model. Methods: Experimental. Methods: Ten equine larynges. Methods: The right arytenoid was fixed in abduction in all specimens. A left-sided laryngoplasty was performed with No. 2 Fiberwire and a FASTakII anchor. Each larynx was tested in a static airflow model. The system was adjusted to a flow rate of 55 L/s and prelaryngeal pressure of 12 mm Hg prior to testing in maximal arytenoid abduction. In phase 1, the left suture was loosened, shortened, and tested in 3-mm steps from 0 to 30 mm. In phase 2, the suture was tied with the DLPS in position at a target left-to-right quotient angle (LRQ) of 0.5. The DLPS was activated to target psi of 0, 25, and 50 for testing. Translaryngeal impedance (TLI), LRQ, cross-sectional areas (CSA), and resultant change in LRQ and CSA between, before, and during airflow testing were calculated. Results: In phase 1, TLI was reduced by suture shortening up to 6 mm (P = .001) but not by additional shortening (P > .05). In phase 2, activation of the DLPS reduced the TLI from 0 psi (0.43 ± 0.08 mm Hg/L/s) to 25 psi (0.16 ± 0.04 mm Hg/L/s, P < .001), but no further reduction was detected at maximal psi (P = .10). Conclusions: Activation of the DLPS effectively reduced TLI. Conclusions: These results justify further investigation of the DLPS to assess its clinical applicability.
© 2018 The American College of Veterinary Surgeons.
Publication Date: 2018-12-20 PubMed ID: 30569487DOI: 10.1111/vsu.13137Google Scholar: Lookup
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- Journal Article
Summary
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The study evaluated an innovative dynamic laryngoplasty system in a static airflow model using horse larynges, finding that its activation (particularly up to 25 psi) effectively reduced laryngeal impedance, a potential airflow obstruction. Encouraging results warrant further investigation into clinical usage.
Objective
- The objective of the study was to evaluate the effects of a prototype dynamic laryngoplasty system (DLPS) in a static airflow model. This was accomplished through a two-phase experimental procedure simulated in horse larynges.
Methodology
- Ten equine larynges were utilized as models for the experiment.
- In each larynx, the right arytenoid, one of two cartilages in the larynx, was fixed in an abducted (opened) position.
- Laryngoplasty, a surgical procedure for the larynx, was performed on the left side using No. 2 Fiberwire and a FASTakII anchor.
- The larynges were then tested in a static airflow model, adjusting the system to a flow rate of 55 litres per second and a prelaryngeal pressure of 12 mm Hg.
- Subsequently, two phases of experimentation were conducted. In Phase 1, the left suture was altered and tested in 3 mm steps from 0 to 30 mm. In Phase 2, the suture was tied with DLPS at a target left-to-right quotient angle (LRQ) of 0.5. The DLPS was then activated to target psi (pressure) of 0, 25, and 50 for testing.
- Measurements were taken including translaryngeal impedance (TLI), LRQ, cross-sectional areas (CSA), and changes in LRQ and CSA during airflow testing.
Results
- In phase 1, significant reductions in TLI (which measures airflow resistance in the larynx) were recorded when the suture was shortened up to 6 mm but not beyond.
- In phase 2, activating the DLPS significantly reduced TLI at 25 psi. However, no further reduction was detected at maximum (50 psi) pressure.
Conclusions
- The activation of the prototype dynamic laryngoplasty system effectively reduced translaryngeal impedance, suggesting its potential to improve airflow through the larynx.
- The promising results of the study justify further exploration into the clinical application and benefits of the DLPS.
Cite This Article
APA
Ahern BJ, Lukas E, Lam K, Wilke E, Bertin FR, Van Eps A, Franklin S.
(2018).
Evaluation of a prototype dynamic laryngoplasty system in vitro with an equine vacuum airflow system.
Vet Surg, 48(2), 173-179.
https://doi.org/10.1111/vsu.13137 Publication
Researcher Affiliations
- Equine Specialist Hospital, School of Veterinary Science, University of Queensland, UQ Gatton Campus, Gatton, Queensland, Australia.
- Equine Specialist Hospital, School of Veterinary Science, University of Queensland, UQ Gatton Campus, Gatton, Queensland, Australia.
- Equine Specialist Hospital, School of Veterinary Science, University of Queensland, UQ Gatton Campus, Gatton, Queensland, Australia.
- Equine Specialist Hospital, School of Veterinary Science, University of Queensland, UQ Gatton Campus, Gatton, Queensland, Australia.
- Equine Specialist Hospital, School of Veterinary Science, University of Queensland, UQ Gatton Campus, Gatton, Queensland, Australia.
- Equine Specialist Hospital, School of Veterinary Science, University of Queensland, UQ Gatton Campus, Gatton, Queensland, Australia.
- Equine Health and Performance Centre, University of Adelaide, Roseworthy, South Australia, Australia.
MeSH Terms
- Animals
- Arytenoid Cartilage / surgery
- Cadaver
- Horses / surgery
- Laryngoplasty / instrumentation
- Laryngoplasty / methods
- Laryngoplasty / veterinary
- Larynx / surgery
- Suture Techniques / veterinary
- Vacuum
Citations
This article has been cited 2 times.- Tucker ML, Wilson DG, Bergstrom DJ, Carmalt JL. Computational fluid dynamic analysis of upper airway procedures in equine larynges.. Front Vet Sci 2023;10:1139398.
- Lean NE, Bertin FR, Ahern BJ. Influence of unilateral and bilateral vocal cordectomy on airflow across cadaveric equine larynges at different Rakestraw grades of arytenoid abduction.. Vet Surg 2022 Aug;51(6):974-981.
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