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Biomedical subjects

M H Levy

Publications and source records attributed to M H Levy.

63 records · Page 4Linked to original sources

Effects of intravenous silica on immune and non-immune functions of the murine host.

Silica, an agent toxic for macrophages, administered i.v. to DBA/2 mice rapidly depresses the clearance of colloidal carbon by the reticuloendothelial system and reduces the in vitro phagocytic activity of peritoneal macrophages harvested 3 days after silica injection. Silica blocks the humoral immune response to sheep erythrocytes and the cell-mediated immune response to allogeneic fibroblasts when given before antigen. Silica also induces complex alterations in spleen cell responsiveness to concanavalin A involving both local and serum factors. Silica had no significant effect on the induction of interferon by statolon or Newcastle disease virus. No unequivocal evidence was obtained that silica has a direct depressive effect on cells other that macrophages, but indirect effects on lymphocytes were produced most likely by factors released from silica-lysed macrophages. Intravenous silica may prove useful for the separation of interferon induction and immune response stimulation in studies of host resistance to infection and oncogenesis. Considerable variation exists in the immunodepressive effects of different preparations of silica.

Animals↗

Zygomaticofrontal suture defect associated with orbital dermoid cyst.

The zygomaticofrontal suture is a strong joint needed for protection of the orbit. During infancy its development can be altered by local mechanical factors which prevent its complete union. The following case report of a man with a slowly growing lesion of the left orbit was found to have a large dermoid cyst communicating with the temporal fossa. Presumably, the presence of choristomatous tissue at the junction of the zygomatic and frontal bones prevented normal closure of the joint during infancy. The computed tomographic findings in this condition are pathognomonic of dermoid cyst.

Bone Diseases↗

The incredible shrinking brain.

A 65-year-old white woman developed progressive visuospatial abnormalities over an eight-year course, secondary to Alzheimer's disease with amyloid angiopathy. Imaging studies demonstrated focal atrophy of the parietal and occipital lobes without hemorrhage. This patient manifested simultagnosia without ocular dysmetria or optic ataxia; hence, a true Balint's syndrome was not present. Her visual acuities and fields have remained stable status post-occipital lobe biopsy.

Aged↗

Supportive care in oncology.

Pain management, nutritional support, and psychosocial support are fundamental services that enhance patients' ability to cope with their cancer and its therapy. The common goal of symptom prevention mandates that each of these supportive services be provided to all patients throughout their cancer experience. Comprehensive cancer pain management begins with identifying the origin of all of the patient's pains and treating each one specifically. Pain prevention can be achieved through around-the-clock opioid administration with as-needed supplements for breakthrough pain and dose titration. Common narcotic side effects such as constipation and nausea also must be prevented. Successful opioid analgesia requires that patient and family concerns regarding addiction and tolerance be dispelled at the outset. Cancer pain prevention can be further optimized with the use of appropriate coanalgesics in response to the pathophysiology of the patient's pains. Cognitive and behavioral therapies may also be useful adjuncts to reduce both pain and suffering. Procedure-oriented pain control should be considered when systemic pharmacologic therapy does not provide adequate pain relief or is associated with intolerable side effects. The only absolute contraindications for pain-relieving procedures are untreatable coagulopathy and a decrease in mental status not related to medical pain management. Useful neurodestructive techniques include radiofrequency lesioning, cryoanalgesia, and chemical neurolysis with agents such as phenol, alcohol, and hypertonic saline. The most beneficial pain-relieving procedures and percutaneous cordotomy, spinal narcotics, celiac and hypogastric plexus ablation, spinal neurolysis, and epidural injection of steroids and hypertonic saline. Procedure selection depends on the cause of the pain and the patient's prognosis. Common indications for pain-relieving procedures include unilateral pain below the shoulder, upper abdominal visceral pains, pelvic visceral pain, perineal pain, vertebral body metastasis, discogenic pain, and spinal stenosis. As results of well-conducted scientific trials begin to appear in the literature, the indications for these procedures will be better understood, resulting in their more appropriate use. Principles of nutritional support in patients with cancer include an awareness of the problem of malnutrition and its impact on performance status, quality of life, prognosis, and treatment; identification of those patients at risk; prophylactic versus therapeutic intervention; and analysis and management of the specific impediment(s) to adequate nutrient intake and absorption. The primary goals for nutritional support in cancer patients are prevention of weight loss and maintenance of adequate protein status. Appreciation of practical issues of nutritional support will enable the practicing physician to achieve these goals using primarily oral nutrition options.(ABSTRACT TRUNCATED AT 400 WORDS)

Analgesics, Opioid↗