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Biomedical subjects

J F Risse

Publications and source records attributed to J F Risse.

At least 19 recordsLinked to original sources
PubMed1992

[Measuring visual field loss by automated perimetry in chronic glaucoma stabilized by trabeculectomy].

The progression of field loss was determined by Humphrey Automated threshold perimetry in the short and intermediate term after surgical trabeculectomy for chronic glaucoma: mean indices (MD, PSD et FOV) were studied before and after normalisation of the intraocular pressure. Risk factors such as secondary glaucoma, previous visual field defects and cardiovascular risk factors were significantly correlated to poor or bad progression of field loss: the mean variation of MD = +1.23 dB +/- 2.84 (p < 1.5%), the mean variation of PSD = 0.50 dB +/- 1.37 (p < 6%), but the mean variation of FOV was not significant; so 36% of field defects were improved, 42% were stabilized and 22% were aggravated. When the risk factors were absent, 86% of field losses were stabilised but when cardiovascular factors were present, only 64% were stabilised. These risk factors can also be used to ascertain the prognosis of post-surgical progression of visual field, as already shown in previous reports. Automated threshold perimetry was useful to study the visual field progression with standardized and reliable numerical parameters, allowing statistical computerised management of the patients with glaucoma.

Adolescent↗
PubMed1991

[Trachoma in North Cameroon].

A study was carried out in the North of Cameroon concerning the frequency of trachomatous blindness among 3,326 cases of blindness. A 4.63% frequency was found. The results show a 2 women for one man sex ratio and differences between the studied ethnic groups. The role of hygiene is stressed in order to explain these numbers.

Cameroon↗
PubMed1989

[Calculation of the implant: is it a useless luxury?].

Analysis of the means by which accuracy of intraocular lens power calculation could be improved with theoretical and linear regression formulas. The postoperative refractive errors with the lenses selected by the surgeon were compared with those observed with the emmetropic calculated power lenses and with a standard 20 diopters lens. A consecutive series of 100 eyes with less than 4.50 diopters of pre-operative myopia or hypermyopia, is evaluated. Postoperative refractive errors are out of the range -4; +4 diopters in 6% for standard lens, 4% for actually implanted lens, and 1% for emmetropic power calculated lens.

Algorithms↗
PubMed1989

[Effects of laser chorioretinal photocoagulation].

Laser-chorioretinal interactions depend on: non controllable parameters: spectral transmission, absorption of tissue, scattering of laser, distribution of ocular chromophores, thermal conductivity of tissue. They are important determinant of laser tissue effects. parameters that can be monitored by the physician: size of the spot, pulse duration, laser energy and laser wavelengths. Theoretical predictions of laser-tissue interaction with the choroid and the retinal agree with histological and clinical data. The choice of physical parameters of laser must be done in order to prevent adverse effects as to obtain researched therapeutic goal.

Choroid↗
PubMed1986

[Prognosis of treated temporal arteritis. Retrospective study of 87 cases].

Eighty-seven patients (mean age 73 years) with histologically proven Horton's disease were followed up in 5 different specialized hospital units from 1970 to 1984. Except for one patient treated exclusively with antimalarials, all were under corticosteroids. The mean initial dose of prednisone or equivalent was 0.7 mg/kg/day and the mean maintenance dose, 10 mg/day. Steroids could be discontinued in 21 cases after 36 months on average; the other patients could not be weaned, even though 4 of them had been on steroids for more than 10 years. Side-effects were noted in 43 cases. Twenty-four patients died, mostly of cardiovascular diseases. Survival rates were 89 +/- 6.35% at 1 year, 60.2 +/- 8.7% at 5 years and 48 +/- 11.3% at 10 years. In the long run, mortality in our series proved to be exactly the same as in the general population. Nineteen patients had ocular manifestations of giant cell arteritis always from the onset, except for a fall in visual acuity; 26 relapses were observed in 18 patients, either during reduction of steroid dosage (21 cases) or after withdrawal (5 cases). In 2 cases histology showed typical lesions of giant cell arteritis after 41 and 50 months respectively under corticosteroid therapy.

Aged↗
PubMed1986

[Orbital zygomycosis (mucormycosis) in a healthy child. Treatment with ketoconazole].

A case of orbital zygomycosis, probably mucormycosis, histologically demonstrated was observed in a healthy host. The etiologic agent could not be identified because of the unsuccessful cultures. No clinical antecedent allowed us to suppose that an immunological deficiency statement was present. It seemed that the fungus did not penetrates by the classical nasal and sinusal pathways. The fungus inoculation probably resulted from a subocular traumatism. The ketoconazole treatment, the only one possible in our case, was efficient.

Child↗