Nasal irrigation delivery in three post-FESS models from a squeeze-bottle using CFD

TL;DR

This study uses CFD to analyze how nasal irrigation distributes in post-FESS nasal cavities, revealing effects of anatomy and head position on saline penetration and coverage, which can inform postoperative care.

Contribution

It introduces a CFD-based method to simulate nasal irrigation in post-FESS anatomies, considering realistic squeeze profiles and head positions, providing new insights into flow dynamics.

Findings

Saline penetrates well into the maxillary sinus with a large ostium.

Head position significantly affects saline residual in frontal sinuses.

Anatomical variations influence saline distribution and coverage.

Abstract

Purpose: Nasal saline irrigation is highly recommended in patients following functional endoscopic sinus surgery (FESS) to aid the postoperative recovery. Post-FESS patients have significantly altered anatomy leading to markedly different flow dynamics from those found in pre-op or non-diseased airways, resulting in unknown flow dynamics. Methods: This work investigated how the liquid stream disperses through altered nasal cavities following surgery using Computational Fluid Dynamics (CFD). A realistic squeeze profile was determined from physical experiments with a 27-year-old male using a squeeze bottle with load sensors. The administration technique involved a head tilt of 45-degrees forward to represent a head position over a sink. After the irrigation event that lasted 4.5 s, the simulation continued for an additional 1.5 s, with the head orientation returning to an upright position. Results: The results demonstrated that a large maxillary sinus ostium on the right side allows saline penetration into this sinus. The increased volume of saline entering the maxillary sinus limits the saline volume available to the rest of the sinonasal cavity and reduces the surface coverage of the other paranasal sinuses. The average wall shear stress was higher on the right side than on the other side for two patients. The results also revealed that head position alters the sinuses saline residual, especially the frontal sinuses. Conclusion: While greater access to sinuses is achieved through FESS surgery, patients without a nasal septum limits posterior sinus penetration due to the liquid crossing over to the contralateral cavity and exiting the nasal cavity early.