The effect of the modified endoscopic Lothrop procedure on the mucociliary clearance of the frontal sinus in an animal model.
BACKGROUND
The surgical management of recalcitrant frontal sinus disease has been a dilemma for otolaryngologists for many years. Although the osteoplastic flap with obliteration has been the gold standard of treatment for years, the modified endoscopic Lothrop (MEL) procedure recently has been advocated as an alternative. However, little is known about the effect of this procedure on the mucociliary drainage of the frontal sinuses postoperatively and this animal study addresses this issue.


METHODS
Fourteen sheep underwent the MEL procedure. The sheep were randomized regarding the use of postoperative irrigation via minitrephines. Each sheep had a nuclear medicine gamma-scintigraphy frontal sinus clearance study via minitrephines performed on each frontal sinus preoperatively and then 3 months postoperatively. Then, the results of these studies were compared.


RESULTS
The scans revealed a trend toward faster clearance times postoperatively. However, this decrease was not statistically significant. Importantly, there was no trend or significant increase in clearance times postoperatively. Also, the use of postoperative irrigation was associated with a nonsignificant trend toward faster clearance times postoperatively.


CONCLUSIONS
The MEL procedure has no adverse effects on the mucociliary clearance of the frontal sinus at 3 months postoperatively. Irrigation of the frontal sinus in the immediate postoperative period showed a trend toward improved postoperative mucociliary function at 3 months.
Department of Surgery--Otolaryngology, Head and Neck Surgery, University of Adelaide and Flinders University, Adelaide, South Australia, Australia.
S P
SP
Rajapaksa
A
A
Ananda
T
T
Cain
L
L
Oates
P J
PJ
Wormald
D000818:Animals; D004724:Endoscopy; D005626:Frontal Sinus / Q000502:physiology*; D009079:Mucociliary Clearance / Q000502:physiology*; D013517:Otorhinolaryngologic Surgical Procedures / Q000379:methods*; D010254:Paranasal Sinus Diseases / Q000601:surgery; D011897:Random Allocation; D012756:Sheep