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argon photo coagulation

Anish Keepanasseril, K Keerthana, Arun Keepanasseril, Dilip K Maurya, D Kadambari, Sharath Sistla
Klippel-Trenaunay syndrome is characterised by vascular abnormality which increases the risk of thromboembolism and haemorrhage. Physiological changes in pregnancy pose an increased risk to these complications. Being an uncommon disorder, there is limited literature about the management of women with pregnancy and Klippel-Trenaunay syndrome. We report in detail two of three pregnancies in a woman with Klippel-Trenaunay syndrome who had repeated episodes of haematochezia leading to anaemia, managed with Argon laser Photo-Coagulation in pregnancy and also reviewed the complications and the management of pregnant women with Klippel-Trenaunay syndrome...
December 2017: Obstetric Medicine
A Mocanu, R Bârla, P Hoara, S Constantinoiu
Esophageal cancer represents one of the most aggressive digestive tumors, with a survival rate at 5 years of only 10%. Globally, during the last three decades, there has been an increasing incidence of the esophageal cancer, approx. 400,000 new esophageal cancers being currently diagnosed annually. This represents the eighth leading cause of cancer incidence and the sixth leading cause of cancer death overall. Taking into account the population's global aging and thus, the increase in the number of patients who will not bear surgery, PCT and radiation, or the fact that they do not want it especially because of deficiencies and associated pathology, the endoscopic ablative techniques with palliation purposes represent the alternative...
April 2015: Journal of Medicine and Life
Suzana Pavljasević, Nurka Pranjić, Dzevdet Sarajlić
Diabetic retinopathy is a disease based on vascular genesis that begins as microangiopathy and develops into macroangioapthy preceded by fibroproliferation changes. According to histo- pathological changes, diabetic retinopathy is divided into nonproliferative, pre-proliferative and proliferative diabetic retinopathy. Possibilities and needs for photo-coagulation in the earlier and later changes in retina reduce the meaning of conservative treatment. Laser photo-coagulation with therapeutical may cause unwanted and damaging effects, as well...
May 2004: Bosnian Journal of Basic Medical Sciences
Anne V Fuchs, Arthur J Mueller, Martin Grueterich, Michael W Ulbig
BACKGROUND: Choroidal hemangioma presents a therapeutic dilemma. Although it is a benign tumor, it may lead to massive exudation of subretinal fluid and a loss of visual function. Argon laser photo-coagulation in a grid pattern may be followed by initial absorption of subretinal fluid, but recurrence is common. Trans-scleral cryotherapy is difficult to apply at the posterior pole of the eye. External beam irradiation may bear a risk of maculopathy and papillopathy. Brachytherapy does not allow placement of radiation to the hemangioma sparing other retinal or choroidal structures...
January 2002: Graefe's Archive for Clinical and Experimental Ophthalmology
A Mendívil, V Cuartero, M P Mendívil
INTRODUCTION: Color Doppler imaging allows for simultaneous two-dimensional anatomical imaging and Doppler measurement of blood flow velocity. Chemicals are released during the development of a thermal lesion caused by photocoagulation. METHODS: A prospective study compared ocular blood flow velocities (ophthalmic artery, posterior ciliary arteries, central retinal artery, central retinal vein and vortex veins) before and 30 minutes after the first episode of scatter photocoagulation (650, 0...
October 1995: European Journal of Ophthalmology
B C Devaux, F X Roux
From initial experiments of ruby, argon and CO2 lasers on the nervous system so far, dramatic progress was made in delivery systems technology as well as in knowledge of laser-tissue interaction effects and hazards through various animal experiments and clinical experience. Most surgical effects of laser light on neural tissue and the central nervous system (CNS) are thermal lesions. Haemostasis, cutting and vaporization depend on laser emission parameters--wavelength, fluence and mode--and on the exposed tissues optical and thermal properties--water and haemoglobin content, thermal conductivity and specific heat...
1996: Acta Neurochirurgica
S K Chakraborty
Metabolism of ascorbic acid is deranged in Diabetes Mellitus (DM). One important reason of this derangement is its increased turnover in the process of handling an increased load of free radicals. Anoxia, the triggering factor in the pathogenesis of diabetic retinopathy generates free radicals in anoxia-reperfusion sequence. Any process like argon laser photocoagulation that destroys the anoxic sites and improves oxygenation in retina might hinder the process of generation of free radicals and thus expected to preserve ascorbic acid...
August 1993: Bangladesh Medical Research Council Bulletin
H D Becker
Most esophageal cancers are at a fairly advanced stage at the time of diagnosis, and curative therapy is not possible. For those that are detected early, cure may be possible, particularly if there is no lymphatic spread. Radical therapeutic approaches result in increased treatment-related mortality, high treatment-induced morbidity, and reduced quality of life. Therefore it is one of the major targets in the treatment of esophageal cancers to classify the tumor and to perform adequate stage-related therapy...
May 1994: World Journal of Surgery
V M Khokkanen
The paper summarizes the ten-year experience with photo-coagulation in tuberculous choriorenitis. The radiation of xenon, argon, neodymium photocoagulators was studied in 85 rabbits by using a tuberculous choriorenitis model. The advantage of applying all the types of radiation is that the scarring of inflammatory foci is accelerated, however, histological studies have revealed that xenon and argon radiation destroys the focus into a limited depth, while neodyium destroys the whole focus with definite parameters, but severe complications being noted, which do not allow its use in patients...
1994: Problemy Tuberkuleza
S H Kim, D E Lee, Y J Park
Choroidal neovascular membranes are often poorly defined on fluorescein angiography because of fluorescein leakage or blockage of hyperfluorescence by overlying hemorrhage, lipid, turbid fluid, or pigment. Indocyanine green (ICG) is a highly protein-bound dye in the near infrared portion of the spectrum. Therefore, ICG remained in and around the neovascular membrane and enhanced the visualization of certain membranes poorly defined with fluorescein. ICG penetrated through the overlying turbid tissue, and improved the visualization of the underlying choroidal neovascular membrane...
June 1995: Korean Journal of Ophthalmology: KJO
B Riss, S Binder
Corneal sensitivity was determined with the Draeger aesthesiometer in 39 patients with proliferative diabetic retinopathy who underwent treatment with a xenon photocoagulator or argon laser. In 29 patients measurements were performed before and after photocoagulation; in 10 patients the unaffected eye was used for comparison. Statistical evaluation showed a significant difference between the mean values for corneal touch threshold before and after argon laser coagulation. After xenon photocoagulation, corneal sensitivity was reduced in all patients (n = 7)...
1981: Albrecht Von Graefe's Archive for Clinical and Experimental Ophthalmology
D P Han, H Lewis, G A Williams, W F Mieler, G W Abrams, T M Aaberg
Acute retinal necrosis (ARN) is a syndrome of fulminant necrotizing vaso-occlusive retinitis associated with a high incidence of retinal detachment due to retinal breaks and vitreous traction. We performed argon or krypton laser photo-coagulation to demarcate areas of active retinitis as prophylaxis against retinal detachment in five patients with ARN. Patients were concomitantly treated with antiviral agents, systemic steroids, and antiplatelet therapy. One patient required multiple additional treatments as retinal necrosis progressed...
August 1987: Archives of Ophthalmology
J L van Delft, N J van Haeringen, E Glasius, E R Barthen, J A Oosterhuis
Aqueous protein content was estimated as a measure of the integrity of the blood-aqueous barrier after paracentesis or argon laser photo-coagulation of the iris in rabbits. Corticosteroid pretreatment topically or by subconjunctival or intramuscular injection exerted only a moderate inhibitory effect on the breakdown of the blood-aqueous barrier. Instillation of 0.1% indomethacin however, strongly inhibited the response in both models. The results are indicative of the potential usefulness of topical administration of prostaglandin synthetase inhibitors in the treatment of non-infectious inflammatory diseases...
March 1987: Current Eye Research
J G Hunter
The Nd:YAG and, to a lesser degree, the argon laser have become valuable tools for the surgical endoscopist. Over the last 10 years, the impetus for application of these expensive instruments has changed from what the laser can do to what the laser can do better than less expensive technology. Whereas a few controlled randomized studies suggest that the Nd:YAG laser is better than no therapy and equivalent to other heat-producing instruments for control of upper gastrointestinal bleeding, such studies do not exist for other laser applications...
December 1989: Surgical Clinics of North America
C L Wang
20 cases (22 eyes) of retinal neovascularization (RNV) secondary to branch vein occlusion were treated with argon laser photocoagulation. The RNV and the area of nonperfusion in these eyes were detected by fluorescein angiography. The results showed that argon laser photo coagulation was a highly effective therapy for RNV which was refractory to treatment. Photocoagulation minimized or resolved RNV and prevented recurrent vitreous hemorrhage. The relationship of RNV with the area of nonperfusion, the selection of the direct or indirect modality, and the points of note for success and prevention of complications were discussed...
July 1989: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
T Tsuru, R Yamaoka
In order to elucidate the influence of acute ocular inflammation on the aqueous humor dynamics and intraocular pressure (IOP), we carried out argon laser photo-coagulations on the rabbit irises and determined the concentrations of aqueous humor prostaglandins (PGs), cyclic AMP and protein. The IOP changed in a biphasic manner, i.e. initial hypertension and later hypotension. The concentrations of aqueous humor PG E2, PG F2 alpha and protein increased markedly after laser irradiation and then decreased gradually, although the concentrations of PG E2 and protein remained significantly higher than the baseline values at 24 hours after the irradiations...
February 1992: Nippon Ganka Gakkai Zasshi
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