532 nm pulsed potassium-titanyl-phosphate laser treatment of laryngeal papillomatosis under general anesthesia.Laryngoscope. 2007 Aug; 117(8):1500-4.L
Angiolytic lasers have been shown to be an effective treatment strategy for laryngeal papillomatosis. These lasers precisely target hemoglobin within the microcirculation of papillary lesions. We have previously demonstrated the advantages of the fiber-based pulsed 532-nm potassium-titanyl-phosphate (KTP) laser in an office setting (with local anesthesia). This investigation provides the first report of the pulsed-KTP laser during microlaryngoscopy under general anesthesia.
A prospective pilot study was performed in 55 adult patients with laryngeal papillomatosis to determine disease response.
During suspension microlaryngoscopy, a solid-state 532 nm pulsed-KTP laser was used (15 ms pulse width, 5.25-7.5 J/pulse maximum output, 2 Hz repetition rate, 0.4 mm fiber, approximately 20-80 J/cm2 fluence) to treat laryngeal papillomatosis. All patients underwent postoperative videolaryngoscopy to assess disease regression based on a previously used rating scale.
Thirty-seven patients underwent 55 procedures during the 18-month study period. Near-term follow-up with an early postoperative evaluation was available in 23 patients (35 procedures). Fourteen patients (20 procedures) were geographically distant and only returned after developing symptoms with significant disease recurrence. Of the 35 procedures in which near-term follow-up was available, 90% or greater disease regression was achieved in 28 of 35 (80%), 75% to 89% disease regression was achieved in 4 of 35 (11%), and 50% to 74% disease regression in 3 of 35 (9%). Anterior-commissure disease was present in 51 of 55 (93%) cases, and no new webbing/synechia occurred. All patients reported that their vocal function improved after treatment.
The 532 nm pulsed-KTP laser was effective for treating recurrent respiratory papillomatosis, which was similar to our experience as an office-based procedure.