Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Light Coagulation”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 595 records · Page 33Linked to original sources
PubMed1990

[Photocoagulation in sex-linked heredofamilial retinoschisis].

In a series of 120 eyes of 60 patients in 24 affected families, 28 eyes were treated by photocoagulation in order to stabilize the extension of bullous peripheral retinoschisis to the posterior pole or to prevent retinal detachment. 3 eyes affected by severe retinal detachment in the months following this treatment. After analysis of spontaneous evolution of the untreated eyes and review of literature, the authors conclude that preventive photocoagulation in bullous retinoschisis is not advised, because of spontaneous regression with age and the possibility of complications. Prophylaxis treatment of retinal detachment by encircling the posterior pole by photo-coagulations is discussed.

Adolescent↗
PubMed1989

[Isolated traumatic rupture of the membrane of Bruch complicated by choroid neovascularization].

The authors report one case of traumatic tear in Bruch's membrane which pass close to the fovea in a thirty year old male. Sub retinal neo-vascularization arise from this choroidal rupture four months after trauma. Binocular diplopia was the first symptom of the sub-retinal neo-vascularization. It extends from the tear to involve the macula with reduction in visual acuity to 2/10eme P14. The spontaneous regression of these abnormal vessels allows to improve visual acuity to 6/10eme P2. Compared with reports in the literature, it seems that spontaneous regression of this sub-retinal neo-vascularization can be explained by the fact it grow from healty retina in young patient. There is no conclusive evidence that coagulation therapy is of any benefit in patients developing such lesions.

Adult↗
PubMed1987

Dye orange and argon green laser photocoagulation effects on the retina and vitreoretinal interface.

We evaluated the effects of dye orange (595 nm) and argon green (514.5 nm) laser energy on the retina and the retinal internal limiting membrane. Moderate retinal coagulation was produced with each wavelength on the macular area of the monkey retina. Acute lesions demonstrated coagulative necrosis of the outer sensory retina, retinal pigment epithelium and choroid. The chronic lesions showed no morphologic evidence of alteration on the retinal surface by scanning electron microscopy. Our study indicated that moderate laser coagulation with these laser energies does not damage the vitreoretinal interface.

Animals↗
PubMed1991

Is the neodymium:YAG laser effective therapy for invasive bladder cancer?

The neodymium:YAG (yttrium-aluminum-garnet) laser can cause transmural coagulation necrosis of bladder tumor or bladder wall. Pathologic specimens of 18 patients prospectively treated with the neodymium:YAG laser before radical cystectomy were reviewed to compare the initial clinical stage of bladder tumor with the final pathologic stage and to assess the destructive tissue effects of neodymium:YAG laser therapy. Eleven of 18 patients were unchanged pathologically in stage of tumor or had tumor progression. Seven patients had a lower pathologic tumor stage; 3 of these patients had pathologic Stage T0 with no residual tumor, with the remainder of patients showing superficial disease. One asymptomatic small bowel injury was discovered at operation. Healing lesions showed marked granulation tissue, coagulation necrosis, and persistent ulceration.

Carcinoma, Transitional Cell↗
PubMed1992

[Laparoscopic cholecystectomy using argon bistoury].

A total of 92 patients were submitted to laparoscopic cholecystectomy during the period Autumn 1990-Spring 1991. The dissection of the gallbladder from the hepatic bed was performed in 40 patients using the Argon beam coagulator, in 25 using the monopolar electrocoagulator and in 27 using the Holmio laser beam. In average, with the Argon beam coagulator time procedure was respectively 2.7 and 5.4 minutes shorter than monopolar electrocoagulator and Holmio laser. Only one complication (pneumomediastinum) was correlated with the use of the Argon beam coagulator.

Adult↗
PubMed1990

Effects of Nd: YAG laser coagulation of myocardium on coronary vessels.

Laser coagulation of arrhythmogenic myocardium proved to be an effective surgical therapy for refractory arrhythmias. To determine the influence of Nd: YAG laser coagulation of myocardium on coronary vessels, a total of 48 transcatheter laser impacts (10 W, 10 sec, 7 W mm2) were directed to the left ventricular free wall via endocardial (24 lesions in 2 dogs) or epicardial (24 lesions in 2 dogs) approach. In 8 of 24 endomyocardial lesions (2 and 6 months old) coronary vessels with a diameter of greater than 50 microns were found within the coagulation zones. The volume of these lesions was significantly (P less than 0.01) smaller (139 +/- 43 mm3) than those (n = 16) with coronary vessels measuring less than 50 microns (311 +/- 87 mm3). Volumes of epimyocardial lesions (1-2 hours old) produced by transcoronary irradiation with normal coronary blood flow were significantly (P less than 0.01) smaller (31 +/- 17 mm3) than with reduced (73 +/- 22) or interrupted (119 +/- 34 mm3) blood flow (n = 8, each). Both directly irradiated coronary vessels and those found within the coagulation zones and scars appeared histologically normal through all layers with an intact intima without fibrosis or thrombosis. The ultrastructure of irradiated arteries, even with total interruption of blood flow, was no different from that of non-irradiated controls. Thus, coronary artery blood flow significantly reduces the volume of coagulated myocardium, whereas the vessels themselves appear to remain undamaged by laser irradiation as used for myocardial coagulation.

Animals↗
PubMed2003

Early experience employing a linear hepatic parenchyma coagulation device.

BACKGROUND: In recent years, hepatic resection for primary and metastatic disease has been facilitated by improved anesthetic and surgical techniques, as well as by the application of new technologies. Historically, the major complications associated with hepatic resection have been postoperative bleeding, bile leak, and liver failure. Resection techniques and devices that minimize hemorrhage and bile leak, and enable the preservation of functional hepatic parenchyma, have been useful in the surgical management of liver tumors. METHODS: Herein, the use of a radiofrequency powered device for the pretransection coagulation of hepatic tissue that simultaneously seals blood vessels and bile ducts 3 mm in diameter or smaller is described. RESULTS: Early results from our single-center experience with the use of this linear radiofrequency device are reported. Seven patients underwent liver resection for either hepatocellular carcinoma or colorectal cancer metastases. There were no postoperative bile leaks, hemorrhage, or hepatic insufficiency. No transfusions were required, and the mean estimated blood loss for the parenchymal transection phase was less than 165 cc. CONCLUSIONS: The linear radiofrequency device is expedient for the pretransection coagulation of hepatic tissue and, thus, facilitates liver resection.

Aged↗
PubMed1981

[Surgery in the treatment of retinopathies (author's transl)].

Conservative measures for the treatment of affections of retina and choroid are being complemented and expanded upon increasingly by the use of xenon or lasercoagulation. Retinopathies are one of the indications for these microsurgical procedures. The etiology varies, whereas the clinical picture is usually similar. Basic criteria for photocoagulation can be established, but these will be modified considerably by the various coagulation techniques of different surgeons. Personal experiences are compared with accounts featuring in the wide range of available literature.

Diabetic Retinopathy↗
PubMed1989

Transscleral cyclophotocoagulation using a contact laser probe: a histologic and clinical study in rabbits.

Transscleral photocoagulation of the ciliary body was achieved in pigmented rabbits using a sapphire probe delivery system coupled to a commercial surgical continuous-wave Nd:YAG laser. This contact technique was found to be effective in reducing intraocular pressure (IOP); greater treatment energies were associated with a more prolonged reduction in IOP, and also correlated with a greater degree of histologic damage to the ciliary body. Treatment energies of 0.8-1.0 Joules produced substantial disruption of the ciliary body. This technique is easy to learn and offers ease in control and placement of the coagulation spots.

Animals↗
PubMed1984

[Infrared contact coagulation of the liver: technic--tactics--results].

A new generation of infrared contact coagulation devices has been successfully used in 158 hepatic resections and 72 liver transplantations. Hospital mortality was 9.94%; no complications attributable to the method were observed. Infrared contact coagulation is a simple, safe, effective, and cheap method for hemostasis in the liver.

Biopsy↗
PubMed1992

[Hemangioma of the glans penis. Its therapy by neodymium:YAG laser].

We report the case of a young male patient with a massive cavernous hemangioma of the glans penis that had developed since childhood. The patient complained of pain when standing for long periods and during erections; furthermore its appearance disturbed him for cosmetic reasons. After associated hemangiomas of the genitourinary tract had been excluded by ultrasonography, intravenous pyelogram and cystoscopy, laser coagulation of the hemangioma was performed with a neodymium:YAG laser with the patient under local anaesthesia. The results of this conservative form of therapy show that it represents an alternative to surgical procedures; we recommend laser coagulation as the treatment of choice in patients with penile hemangiomas. The pertinent literature is reviewed.

Adult↗
PubMed1989

[Transudative myopic maculopathy: pathogenetic validity and comparative effectiveness of laser interventions].

The paper presents a retrospective (5-10 years) analysis of results of treatment in a group of patients (104 eyes) with "moist" myopic maculopathy and initial visual acuity from 0.04 to 0.3. Subretinal neovascular membranes were found in 59% of eyes. Localization of the membranes was subfoveolar in 48% of cases, parafoveolar--in 39%, extrafoveolar--in 13%, the size of them being to 300 micrometers in 28%, from 300 to 800--in 58%, more than 800--in 14% of cases. Comparative assessment of effectiveness of various kinds of laser coagulation, laser stimulation and conservative treatment has shown laser coagulation to be the most effective and pathogenetically substantiated method of treatment of neovascular membranes. The most resultant is laser coagulation by the type of "panmacular" in combination with radical laser coagulation of neovascular membranes (if they are present). The most radical is laser coagulation with preservation of a new point of gaze fixation, ensuring preservation of a rather high visual acuity, 0.3. Laser coagulation has a transient effect only in cases of myopic maculopathy without neovascular membranes. Conservative treatment is ineffective. Mechanisms of therapeutic action of laser coagulation and laser stimulation are discussed.

Adolescent↗
PubMedDate not supplied

[Retina and qualitative abnormalities of hemoglobin (author's transl)].

The classification of the main qualitative abnormalities of hemoglobin is recalled. The five phases of the retinal changes caused by drepanocytosis are described. Their pathogenesis is explained. The specialized treatment is photocoagulation after cryokiming coagulation has been discarded. Nowadays laser is used but the timing and the indications for this treatment are not yet fixed.

Fluorescein Angiography↗
PubMed1979

Coaxial bipolar probe.

A coaxial electrode probe that uses the principle of bipolar coagulation is introduced to ophthalmic microsurgery. The central, or axial, electrode is insulated with silicone from the surrounding outer, or coaxial, diameter electrode. The probe uses available bipolar electrode cautery power and control sources. The distance between the electrode is fixed. Therefore, uniform and repeatable coagulations are attained under controlled power settings. Unwanted microscopic scleral shrinkage is eliminated, while desired scleral shrinkage is controlled. Precise pinpoint coagulations of individual capillaries are routine, especially at corneoscleral incision sites. Higher power settings produce a desired scleral marker in retinal surgery.

Electricity↗