Iraqi Journal of Laser

The biological effects of pulsed N2-laser on the old world screw-worm fly, Chrysomya bezzianaVilleneuve in the pupal stage were investigated. Different laser parameters were involved in this work. The old pupae of 1, 2, 3, 4 and 5 days were exposed to laser radiation during 10, 30 and 60 second with repetition rate 10, 20 and 30 pulse/second. The percent of normal adults emergence (female and male) was investigated. The results showed that the adults emergence was highly decreased as the repetition rate andexposure time increased when the pupae irradiated for 1, 2 and 3 days old as compared with 4 and 5 days. The results also indicated that the pupal period was significantly increased of irradiated pupae for 1, 2, 3 and 4 days old, while the 5 days old pupawas decreased.

Objective: Verrucae vulgaresare commonly encountered. The present work is designed in an attempt to build a systematic procedure for treating warts by carbon dioxide laser regarding dose parameters, application parameters and laser safety.Patients and Methods: The study done in thedepartment of dermatology in Al-Najaf Teaching Hospital in Najaf, Iraq. Forty-two patients completed the study and follow up period for 3 months. Recalcitrant and extensive warts were selected to enter the study. Carbon dioxide laser in a continuous mode,in non-contact application, with 1 mm spot size was used.The patients were divided into two groups. The first group of patients consisted of 60 lesions divided to 6 equal groups, in whom we use different outputs and two modes of application (helical and radial) to assess the optimal power density and the best mode of application.The second group consisted of 75 lesions treated with output of 10 W continuous mode using helical mode of application.Results: The optimal powerwas found to be 10 W. In the second group of patients, after 1-6 passes of laser (median 2.8 pass), complete clearance of the lesion was noticed in 56 lesions with a cure rate of 74.6%. This was found in 32(68%) recalcitrant lesions and 24(85.7%) lesions that had no previous treatment. The main complications were scarring in 17(22.5%) lesions and hyperpigmentation in 7 (12.5%) lesions. Post-operative infection was noticed in 4 (6%) lesions that were larger than 2 cm in diameter.Conclusion: Carbon dioxide laser therapy of recalcitrant and extensive viral warts should be considered as a viable alternative to other more traditional techniques.This treatmentoffers good results in eliminating the verrucae and minimizing the squeals of recurrence, scarring and the post-operative pain.

The present study was conducted with a view to determine whether focal laser therapy result in visual recovery and regression of macular edema in patients with non proliferative diabetic retinopathy and maculopathy ,and whether combined focal and scatter laser therapy in patients with proliferative diabetic retinopathy and maculopathy results in visual recovery ,regression of macular edema and regression of the risk factors. In the present work, a frequency doubled Nd: YAG laser was used for the treatment of diabetic retinopathy. The study evaluates 41 eyes of 33 diabetic patients both with Insulin Dependent Diabetes Mellitus IDDM,(n=16)and Non Insulin Dependent Diabetes Mellitus NIDDM,(n=17) with diabetic retinopathy divided into two groups.Maculopathy was regressed in 32/41 treated eyes, 23/24with maculopathy and non-proliferative diabetic retinopathy are treated by grid laser photocoagulation,9/17with proliferative diabetic retinopathy and maculopathy are treated by grid combined with pan retinalphotocoagulation. Maculopathy was unchanged in 7/41, deterioration in 2/41.Visual acuity improved in 8/41 patients one line of Snellen chart in young patients with shorter duration and non-proliferative diabetic retinopathy,and good visual acuity priorto therapy and31/41stabilized visual acuity for the follow up period,2/41deterioration of visual acuity by one line of Snellen chart with progression of edema, hemorrhage and exudation, 3/41patients complain of paracentral scotoma one-week post treatment improved gradually after 2 weeks.Higher power density is needed to treat the diffuse form of maculopathy regarding the severity of maculopathy and macular edema.The power density needed to have the desired effect is less in more pigmented fundus than in fair fundus in order to have the same effect.