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Biomedical subjects

H Weissleder

Publications and source records attributed to H Weissleder.

At least 19 recordsLinked to original sources
PubMed1992

The evaluation of biological efficiency of electromagnetic fields generated by implanted radiotelemetric transmitters used in space research on animals.

The study was carried out in 50 male rats abdominally implanted with biotelemetric systems (BTS) or mock-up. The animals were provided with 12/12 light/dark schedule during 6-week experiment. The electromagnetic field (EMF) frequency was 455 kHz, magnetic induction near transducer was about 10(-2) mT. Circadian rhythm of the body temperature and locomotor activity was controlled in course of the experiment. The latter been finished, some tissues and the blood of the animals have been sampled to test corticosterone, testosterone, T3, T4 level in serum with radioimmunoassay and membrane permeability for Ca2+, Na+, K(+)-ATPase activity and charge changes in liver microsomes was detected. The probable ways of the EMF influence on whole body are discussed.

Animals↗
PubMed1989

Interstitial lymphangiography: initial clinical experience with a dimeric nonionic contrast agent.

Interstitial lymphangiography performed with intradermal injection of a new nonionic dimeric contrast agent was used to examine 34 normal lower extremities and 35 lower extremities with proved lymphedema. An infusion pump was used to inject 2 mL of the contrast agent into the intradermal interdigital space at a rate of 0.1 mL/min. In all normal extremities, the injection deposit appeared homogeneous, and one to five lymph vessels could be identified. Diffusion of contrast agent into perilymphatic tissue occurred 30-40 cm proximal to the injection site; inguinal lymph nodes were, therefore, not routinely visualized. The findings at interstitial lymphangiography were abnormal in all extremities with advanced lymphedema. The results indicate that interstitial lymphangiography with the use of a nonionic dimeric contrast agent allows morphologic assessment of lymphatic vessels and facilitates the diagnosis of lymphatic obstructive disease.

Adolescent↗
PubMed1988

Lymphedema: evaluation of qualitative and quantitative lymphoscintigraphy in 238 patients.

Lymphoscintigraphy was performed in 128 patients with primary lymphedema, in 91 patients with secondary lymphedema, and in 19 healthy volunteers. A total of 457 extremities were examined. Technetium-99m-labeled human serum albumin was injected subcutaneously, and passive muscular exercise was standardized to reduce the variability of lymphatic function. The scintigrams were analyzed for visualization of lymph vessels and lymph nodes, dilatation of lymphatic vessels, existence of collateral vessels, and dermal backflow. With this qualitative interpretation alone, the diagnosis of lymphedema was established in 216 of 308 extremities (70.1%). Quantitative parameters derived from clearance data showed abnormal lymphatic function in all 308 extremities. Whereas qualitative lymphoscintigraphy allows the characterization of lymphatic morphology, quantitative lymphoscintigraphy is very accurate in detection of incipient lymphedema.

Adolescent↗
PubMed1985

Conservative treatment of lymphoedema of the limbs.

Management of Lymphoedema is extremely variable in the medical profession, ranging from aggressive diagnostic procedures, which may aggravate the disease (lymphography by oily contrast mediums) in combination with therapeutic nihilism to precipitous operations. Scattered between these two contraversial extreme positions are quite a number of various conservative methods - some of which being in conflict with the anatomy and physiology of the lymph vascular system and the pathology of Lymphoedema. Lymphoedema, if left untreated, or is treated inadequately, may lead to invalidity and to death if Stewart-Treves Syndrome develops. Unnecessary surgery may have disastrous consequences. The paper describes how Lymphoedema can be treated with success, free of any side effects, by complex physiotherapy.

Bandages↗
PubMed1977

[Mammography with minimal radiation dosage. Comparative studies on various imaging systems].

Using an MR-film-screen combination for mammography, only 8% of the usual radiation dose was found to be necessary. This corresponds with an average skin dose of 0.55 R per exposure. The new technique resulted in visible improvement of contrast. Some loss of detail affected in particular the recognition of macrocalcification. As the sole method for the early diagnosis of occult carcinomas of the breast, it will therefore be necessary to improve image quality. The system is suitable for control examinations and investigation of special problems. The use of the MR system with non-screen film in two planes is discussed in relation to dose reduction.

Breast Neoplasms↗
PubMed1976

[Supra-renal venography in patients with suspected endocrine hypertension (author's transl)].

In forty patients suspected clinically of having an endocrine cause for hypertension, an adrenal cortical adenoma was confirmed histologically in five. Hyperaldosteronism with enlarged or normal adrenals was demonstrated in three patients. The diagnosis in a further eight patients with an abnormal hormone pattern and/or an abnormal venogram has not yet been confirmed. Adrenal glands show considerable variation in their size, shape and localisation on venography.

Adenoma↗
PubMed1976

Distribution pattern of radioactive labelled lipiodol-UF following intralymphatic application for therapy.

Endolymphatic radiotherapy with 4 mCi32P tri-n-octylphosphate and 1 mCi 131 I triolein LIPIODOL UF has been performed in 75 patients suffering from malignant melanoma of the lower extremity. On the average, 13.3% of the radioactive substance remains in the syringes and connecting tubes. In most patients the radioactive material available for therapeutic irradiation is further reduced due to contamination of operation sheets and swabs (mean: 15.3%). There is, however, still sufficient radioactivity remaining for effective internal irradiation of the lymph nodes. The average radiation dose absorbed by the lymphatic tissue is 90.998 rad. The method is limited by the hazard of radiation damage to the lungs. Almost 80% of these patients had detectable concentrations of radioactivity in the lung fields. The average radiation dose was found to be 299 rad. So far radiation induced fibrosis has bot been observed in this series.

Humans↗