[Clinical experience with power-regulated contact laser surgery for the paranasal sinuses and the anterior skull base].

BACKGROUND

While laser surgical methods in Otorhinolaryngology have become widely established, their use in revision surgery for chronic-polypous sinusitis has been regarded as hazardous due to the vicinity of the anterior skull base and the orbit. However, new experience with laser-tissue interaction in contact irradiation together with effective power feedback control mechanisms require a re-evaluation of laser revision surgery in this field.

PATIENTS AND METHODS

After 742 primary, endonasal-microscopic sinus surgery procedures, 86 patients had 128 Nd:YAG-laser sessions performed within an interval of 1 - 24 months after primary surgery for recurrent polyposis, which had been irresponsive to medication. The maximum power delivered was 10 to 20 W.

RESULTS

Recurrent polyposis appeared mostly in the maxillo-ethmoid angle, followed by the maxillary sinus roof and the maxillary sinus bottom. In 63 of 86 patients, no further polyposis was seen after laser surgery. If more than one laser session had to be performed, recurrent polyposis appeared in a different region in most cases. Those areas lasered first showed a reduced tendency to recurrence. There was moderate bleeding during laser surgery in 6 cases with reduced visibility, but no other serious complications were recorded.

CONCLUSIONS

Laser surgery for chronic-polypous sinusitis is an alternative to conventional revision surgery, if medical treatment fails and recurrent polyposis is confined to certain regions. Feedback-controlled contact laser power delivery adds further therapeutic safety when applied next to the anterior skull base and the orbit.