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Biomedical subjects

W Weder

Publications and source records attributed to W Weder.

At least 145 records · Page 8Linked to original sources
PubMed1990

Direct revascularization of bronchial arteries for lung transplantation: an anatomical study.

Direct revascularization of the bronchial arteries for both single-lung and double-lung transplantation would improve airway healing and reduce airway complications after transplantation. We studied the anatomical pattern of bronchial arteries in 30 autopsy cases. In 28 of 30 cases (93.3%), at least one left bronchial artery arose directly from the anterior wall of the descending thoracic aorta. In 25 of the 30 cases (83.3%), at least one right bronchial artery was related to the first right intercostal artery. Injection studies showed that this right intercostobronchial artery supplies the proximal left main bronchus and carina as well as the right bronchus. We developed a technique for extracting the lungs along with the right intercostobronchial artery and a patch of aorta at its origin and applied it to 19 of the dissections. In 17 of the 19 cases studied (89.4%), the right intercostobronchial artery pedicle obtained had a length varying from 6.5 to 8.5 cm, sufficient for attachment of its origin to the ascending aorta of the recipient after double-lung transplantation. The right intercostobronchial artery pedicle provides the possibility for direct bronchial revascularization in right single-lung, double-lung, and lung-heart transplantation. A similar technique, utilizing the left bronchial artery, can be used to revascularize a left lung transplant.

Aorta, Thoracic↗
PubMed1989

[Qualitative and quantitative diagnostic possibilities of papillary colorimetry].

Papillary colorimetry is a qualitative and quantitative diagnostic method that defines the displacement of the temporal and nasal color ranges on the x;y plane of the German Industrial Standard (DIN) color chart. Starting with normal temporal and nasal papillary stain values, there are, for qualitative diagnosis, four different directions in which the color range can shift from normal values on the DIN color chart, i.e., in connection with simple optic atrophies, optic atrophies due to vascular conditions, hyperemic papillae, and deviations of the color range under vasodilative therapy. Quantitative examinations of optic atrophy using papillary colorimetry have so far been conducted (1) with simple descending atrophies, (2) following anemic papillary infarct, and (3), rudimentarily, in cases of glaucomatous optic nerve head. The best correlation between papillary atrophy and loss of visual function was found with simple optic atrophy. Hence this last-mentioned condition represents the principal area of application of papillary colorimetry as an examination method.

Colorimetry↗
PubMed1988

1.5 T MRI, CT, ultrasonography and scintigraphy in hyperparathyroidism.

The enlarged parathyroid glands of twenty-four patients with primary, and 5 with tertiary, hyperparathyroidism were prospectively studied with MRI, CT, ultrasonography and subtraction scintigraphy prior to surgery. Sensitivities in a prospective study were 63, 60, 53 and 44% for the primary, and 71, 67, 44 and 11% for the tertiary, disease form. On MRI, diseased parathyroids showed the "typical" behaviour of tumours with high signal intensity on T2-weighted and low signal intensity in T1-weighted images. On CT, the lesions were hypodense and on US hypoechoic relative to the thyroid. Retrospective analysis of MRI and CT images yielded sensitivities of 87 and 85%, respectively.

Diagnostic Imaging↗
PubMed1987

[Determination of visual acuity using optokinetic nystagmus. A newly developed instrument based on Günther's principle].

The two most important methods used for objective determination of visual acuity are those of Ohm-von Romberg and Günther. A newly developed instrument based on Günther's principle is described which combines the advantages of both methods. Using a Leitz projector and a specially designed accessory unit, a constantly moving screen of dots measuring 64 X 64 cm is projected. The setting was standardized on the basis of 358 eyes with visual acuities ranging from finger counting to 1.0. The correlation between the measured distance (from screen to patient) at which an optokinetic nystagmus was just induced and visual acuity was r = 0.98 over the entire visual acuity range. The visual acuity to be expected can be read off from the diagrams or a table, with a scatter range of +/- 1 sigma, +/- 2 sigma, or +/- 3 sigma. The relevant literature is discussed. Replication of the accessory unit described can be recommended.

Humans↗
PubMed1987

Complications and results after trabeculotomy.

This paper reports the complications and results after 80 trabeculotomies for open angle glaucoma, which were performed between 1971 and 1975 at the University Eye Clinic in Marburg. The longest follow-up period was between 1.5 and 2.0 years. Intraoperative complications included anterior chamber bleeding, synechias, and mild cataracts. In 2/3 of the operated eyes the intraocular pressure could be controlled without additional medication. Twenty-eight percent of the patients again required pressure-reducing drugs 1 year after trabeculotomy; 11% still remained hypertonic.

Evaluation Studies as Topic↗
PubMed1983

[Calcitonin-producing duodenal carcinoid in Recklinghausen's neurofibromatosis. Clinical case report and review of the literature].

In a 32-year-old woman presenting with fever, vomiting and right upper abdominal pain a tumor of the papilla of Vater was detected endoscopically and removed surgically. Histologically it was a carcinoid shown immunohistochemically to produce calcitonin. The tumor had metastasized to a lymph node in the hepatoduodenal ligament. Clinically the patient showed typical signs of von Recklinghausen neurofibromatosis. A survey of the literature suggests that carcinoid of the papilla of Vater may be more frequent in patients with neurofibromatosis. Possible relationships between neurofibromatosis and carcinoid are discussed in the light of the pertinent literature.

Adult↗
PubMed1983

[Results of iridectomy in narrow-angle and open-angle glaucoma. A retrospective study].

Between 1970 and 1975 166 iridectomies were performed in cases of primary glaucoma. In the retrospective study reported here the authors analyzed the results with regard to the regulation of intraocular pressure (IOP) and loss of function. Follow-up examinations were performed (1) between 6 weeks and 6 months, (2) 12 months, (3) 1.5 to 2.5 years and (4) 3 to 4 years after surgery in patients whose IOP was not adequately regulated. Hypotonia was rare. Of the eyes with acute narrow-angle glaucoma with an open iridocorneal angle by definition, which underwent surgery for the first time, 30% had an IOP of more than 21 mm Hg with or without additional tension-lowering medication (20% between 22 and 24 mm Hg, 10% over 24 mm Hg). The results for eyes operated on for the second time were better because of the prophylactic iridectomies in this group. In one-third of the cases the iridocorneal angle was occluded; in two-thirds an open angle was found. An analysis revealed that regulation was better when the previous tension level had been high, while lower tension levels, of between 20 and 35 mm Hg, often remained elevated after surgery. Out of the total number of eyes operated on for the first time (narrow-angle and open-angle glaucoma) IOP was regulated by iridectomy alone in 54% after 1 year and in 33% after 2 years. With regard to the iridocorneal angle of these 33%, it was found that 50% of the cases of narrow-angle glaucoma were regulated without further medication, but only 20% of the open-angle cases.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1981

[Relation of color-coordinate transposition in temporal papillary pallor to visual acuity].

The authors first described the method of fundus color measurement by visual comparison in 1974, and by its use the clinician is able to follow the development of optic disc atrophy or diseases in which hyperemia is seen by using quantitatively defined color coordinates. Color coordinates of the nasal and temporal papillary halves in 100 normal eyes are demonstrated in the x and y plane. The palor range in atrophy is in the upper left part of the scale in comparison to normality. The mathematical relationship between visual acuity and temporal papillary palor is demonstrated in a defined group of 98 eyes. A formula has been derived with which the probable visual acuity can be calculated from the measured color coordinates and its clinical use is described.

Color↗
PubMed1981

[Home orthoptic practice by means of stereoprojection].

As we know polarisationhaploscopy is a method of dividing right and left side vision. Modern visusprojectors have this installed for the examination of binocular vision. A method of stereoprojection on a large silver screen is demonstrated, until now this was not done on account of technical difficulties. With this new method principally the same examinations are possible as with the phase-difference-haploscope. The projected picture is a fusionimpuls of brilliant picture quality. Fusion and stereobjects with differently near foreground motives that were photographed in differing distances and with different stereobasis as well as numerous projection variations give a wide spectrum for practicing. The slides should be taken in the known surroundings of the children so that they show more interest in practice than when using the prism bar. The optimal circumstances for stereoprojection and orthoptic practices relying on literature are shown. The position of the geometric pictures and circumstances of orthomorphe and heteromorphe pictures are demonstrated by graphics. A convergent systemposition always leads to a heteromorphe projection with a shortening of the stereoscopic range. The perception frequently differs from the objective geometric construction. The normal stereoprojection and orthoptic practices are not disturbed by the objective and described pictureblurring. Examples demonstrate how to set up the system for a defined squintangle as well as how to find the reached fusionspan. Using a third projector enables a continuous change from uncrossed dispertion to crossed without change of slides.

Humans↗
PubMed1980

[Measurement of color-coordinates of the fundus by the color-comparison method with a widened measurement scale (author's transl)].

The method of color measurements by visual comparison was first described in 1974, but the original method was not always adequate in documenting fundal changes in patients being treated with vasodilatators. In these cases the color coordinates reached the threshold of the measuring scale or went beyond it in the livid color area. A few years ago the color measuring instrument was supplied with a new filter system for this purpose and was necessary to move the left cornerpoint of the measuring scale far into the blue range. The instrument and the physical data are described, the standard color values x and y being found by transformational equations. The technical error was measured on a phantom eye. In a defined group of 100 normal eyes (=100 testing persons) the standard color values of the temporal and nasal papillary segments were measured. They are graphically demonstrated in the now widened x; y measuring scale. Clinical use and results will be described later.

Color↗