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Biomedical subjects

S Clemens

Publications and source records attributed to S Clemens.

At least 55 records · Page 3Linked to original sources
PubMed1994

[Retinopathia praematurorum: risks and critical timing].

Two prospective studies were performed to characterize the retinopathy of prematurity (ROP) risk in preterms further. In the first study the gradual relationship between birth weight, gestational age and duration of oxygen therapy and the incidence of ROP was evaluated. A total of 487 preterms were enrolled in this survey. Seventeen percent (67 babies) of 389 surviving children presented clinical signs of acute ROP. Among the analyzed risk factors "gestational" age provided the best correlation with the manifestation of acute ROP. According to the nonlinear regression model the risk of acute ROP can approximately be calculated as: R = 2(39-SSW).0.5 (R = relative risk of ROP in %). The second study focused on the relationship between individual risk factors and the age at stage III onset. The mean age of the first ROP stage III diagnosis was 66 days after birth at an average gestational age (post-menstrual age) of 37.0 weeks. Multifactorial analysis clearly demonstrated that birth weight was most informative among the tested set of parameters concerning the age at onset of ROP stage III. Best fitted linear regression of this relation was: LAT = 100-BW.34 (LAT = age at onset of ROP III expressed as postnatal days; BW birthweight measured in kg). It is suggested to take this approximation into account for the timing of ROP screening.

Birth Weight↗
PubMed1993

Rehabilitation following traumatic hand injury: hand therapists' perspective. Part 1: Acute phase of hand rehabilitation.

The specialty of hand therapy was developed in response to advances in surgical techniques that enabled greater functional restoration of injured and diseased upper extremities. Such restoration requires the therapeutic intervention of a skilled, specialized practitioner who is able to integrate the principles of rehabilitation with these surgical interventions (Chai, Dimick, & Dasach, 1987). This article will provide a general overview of hand therapy as practiced by one midwestern institution.

Bandages↗
PubMed1992

The retinal pigment epithelium in clinical echography.

The resolution of the Triscan (Biophysic Medical) and the Cooper-Alcon 2000 equipments proved sufficient for depicting three separate curvilinear echostructures from the back of the eye. The anatomical counterparts are the inner limiting membrane of the retina, the pigment epithelium, and the inner surface of the sclera. Imaging will be impeded due to sound dispersion if the sound beam is directed through the lens, or via the cornea and the pars plicata of the ciliary body, respectively. The potential of the method is discussed.

Eye Diseases↗
PubMed1991

[The sensitivity of computed tomography in the detection of malignant melanomas of the choroid].

193 patients with the ophthalmic diagnosis of a primary choroidal melanoma were studied by computed tomography (CT) in relation to the ultrasound (US) prominence. The location and size as well as the density of the tumour and the vitreous body were measured. The tumour was observed most frequently in the fifth, sixth, and seventh decades of life, with a female preponderance in our series. There was a high correlation between CT and US in the average tumour thickness. But we measured a greater thickness in tumours with US prominence less than 3.5 mm and a smaller thickness in tumours with a US prominence greater than 6 mm. 79% of the melanomas could be distinguished by CT. Especially melanomas with an US prominence of less than 3 mm failed to be detected. The smallest tumour that could be differentiated by CT had a prominence of 2 mm, the largest missed had a prominence of 3.5 mm. In 75% of our contrast CT in patients with 2.5 and 3 mm prominence we could diagnose the tumour, in the noncontrast CT it was only possible in 34%. The enhancement of the vitreous body and the tumour were noted in all patients with contrast CT, the average density increased in the vitreous body for 22% and in the melanoma for 30%. Hence, it is essential to use intravenous contrast media in small choroidal melanomas.

Adult↗
PubMed1991

[Cold dosage in retinal cryotherapy using echography].

In cases of obscured view of the fundus a precise timing of cryotherapy of the retina is not possible. In order to avoid complications from overtreatment we use the real time ultrasonography for monitoring the spreading ice in relation to the retina.

Cryosurgery↗
PubMed1991

[Reasons for failure after episcleral buckling operation of the retina].

In this retrospective study about failures of epiretinal buckling procedures performed over 12 years the causes of failure are analysed. The main ones are: new retinal holes, PVR, wrong localization, and inadequate buckling effect. The aim of this investigation was to find indications of the best technique, with a view to improving the success rate, currently, 80-90%, even further.

Adolescent↗
PubMed1988

[Interface echos between the retina and choroid].

In 61 patients echographically examined in A and AB mode at Münster University Eye Hospital a membrane-like echo was found between the retina and the choroid. The acoustic characteristics were studied. The usefulness for the differential diagnosis of retinal detachment was demonstrated with several situations of the retina. The thickness of the retina and choroid can be measured in routine examinations.

Choroid↗
PubMed1987

Experimental studies on the disappearance of subretinal fluid after episcleral buckling procedures without drainage.

We have developed an experimental model to show that an additional mechanism apart from absorption by pigment epithelium is responsible for the absorption of subretinal fluid. The cause of a fast diminution of subretinal fluid after a buckling procedure is the prominence of the buckle as an obstacle to fluid movements in the eye. This results in any fluid being pushed through the retinal hole into the vitreous. When the retinal hole is closed by the buckle, the remaining part of the subretinal fluid is slowly absorbed by the pigment epithelium present. We performed a preliminary qualitative and quantitative analysis of the phenomena occurring using the finite element method of Zienkiewicz.

Absorption↗
PubMed1987

[Echography of the posterior lens capsule before implantation of an artificial lens].

Clinical echographic examinations were performed in 15 cases of traumatic cataract. As a result certain criteria were established which give some information on the condition of the posterior capsule of the lens. Echographic examination prior to reoperation enables the procedure to be optimized with regard to IOL implantation, anterior vitrectomy, or prevention of retinal detachment.

Cataract↗
PubMed1986

Ultrasonography as a routine examination before treatment of retinal detachment due to macular hole.

Twelve of 25 patients were treated at the University Eye Clinic in Münster because of retinal detachment due to a macular hole. Partial fluid gas exchange (SF6), vitrectomy and SF6, or vitrectomy and silicone instillation, were used, and the patients were examined both pre- and postoperatively by ultrasonography with particular attention to the situation at the posterior pole. These echographical examinations enabled us to evaluate the following three criteria: staphyloma posticum, stiffness of the retina, and vitreous adhesions. All of these conditions mean that the prognosis will be worse if SF6 gas instillation is used alone. In these cases, a vitrectomy should also be performed or a Klöti-Klemme procedure is useful when stiffness of the retina or staphyloma posticum is present. Preoperative ultrasonography is useful when setting up an adequate therapy plan.

Eye Diseases↗
PubMed1986

[Unilateral pseudotumor of the orbit--an autoimmune disease?].

An eleven-year-old boy with congenital paresis of the left superior rectus eye muscle developed symptoms of acute left orbital expansion: pain, ptosis, redness, extraocular muscle dysfunction. Computer assisted tomography of the orbit showed typical signs of inflammatory orbital pseudotumor and immunological screening cryoglobulinemia. Short-term treatment with prednisone (2 mg/kg bodyweight/day) rapidly improved symptoms. However several relapses occurred following discontinuation of therapy. Therefore a long-term treatment with corticosteroids was instituted. The simultaneous development of inflammatory orbital pseudotumor and cryoglobulinemia support the hypothesis that orbital pseudotumor is an autoimmune disease. The meaning of the congenital superior rectus muscle paresis in this case for the development of the inflammatory process remains uncertain.

Autoimmune Diseases↗
PubMed1986

[Late sequelae of the Caldwell-Luc operation. Comparison between the classic and Feldmann osteoplastic technic].

Complaints and clinical findings with 178 classical Caldwell-Luc operations and 107 osteoplastic operations of maxillary sinus were compared in a follow-up study which took place at least 18 months postoperatively. After this time, the scarring process had reached a steady state. Unpleasant symptoms such as facial neuralgia and discomfort, were reduced to half after osteoplastic reconstruction of the anterior wall of the maxillary sinus. Postoperative closure of the antral nasal window occurred in 32.2% of the patients with the classical and in 17.3% with the osteoplastic procedure. Only 3 out of 34 replanted bone lids showed disturbed healing, as shown by 10 MHz B-Scan ultrasonic examination.

Adult↗
PubMed1985

[Intraocular therapy of macular hole-induced retinal changes].

The treatment of retinal detachments due to macular holes without further central peripheral holes with intraocular tamponades (SF6, silicone oil) is preferred to episcleral techniques. After treatment of 24 cases of retinal detachments due to macular holes a therapeutic program is proposed.

Adult↗