Equine laryngoplasty sutures undergo increased loading during coughing and swallowing.

This research aimed to identify how much force is exerted on a single laryngoplasty suture for optimal arytenoid cartilage abduction in horses and how this force changes during various actions like coughing and swallowing, as well as during 24-hour stall rest.

Methods Used in the Study

• The study was conducted on eigh horses.
• An E-type buckle force transducer was fitted to each laryngoplasty suture to monitor the force required for optimal left arytenoid cartilage abduction during the operation.
• The force measured during surgery was then compared with the cartilage’s postoperative abduction state.
• Any change in suture force from the established baseline was recorded during induced coughing and swallowing and during their normal activity in the stall.

Results of the Experiment

• The optimal intraoperative arytenoid abduction was achieved with an average force of 27.6±7.5 Newtons.
• During saline-induced swallowing and coughing, the average force on the suture increased by 19.0±5.6 Newtons for seven horses, and 12.1±3.6 Newtons for four horses.
• The sutures experienced increased loading an average of 1152 times in 24 hours.
• No change in suture force was observed with regard to respiratory rhythm.

Conclusions Derived from the Study

The researchers found that the act of swallowing increases the force of a laryngoplasty suture to a greater extent than does coughing. This outcome highlights the potential strain that sutures undergo during common equine behaviors, providing veterinarians with crucial insight into postoperative care and potential complications. The findings may also guide the refinement of surgical procedures and development of suture materials more resistant to these forces.