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Biomedical subjects

L A Levin

Publications and source records attributed to L A Levin.

At least 73 records · Page 4Linked to original sources

Retinal pigment epithelial tears associated with trauma.

Two previously healthy patients, a 66-year-old man with blunt trauma to the right eye, and a 28-year-old man with head trauma from a motorcycle accident, were observed to have parafoveal retinal pigment epithelial tears after injury. In both patients, fluorescein angiography demonstrated mottled window defects in the areas of the tears, and blocked fluorescence in the areas of the rolled-up pigment epithelium. Neither eye had evidence of pigment epithelial detachments. We hypothesize that this unusual phenomenon is caused by an acute tractional force oriented tangentially to the macular plane, the result of a rapid spherically expansile deformation of the globe during trauma.

Accidents, Traffic↗

Cardiac rehabilitation--a cost analysis.

This economic evaluation is based on a 5-year follow-up study comparing a comprehensive cardiac rehabilitation programme with standard care after myocardial infarction (MI). The intervention group consisted of 147 non-selected MI patients aged less than 65 years, who were participating in a rehabilitation programme consisting of follow-up at a post-MI clinic, health education and physical training in out-patient groups. The control group consisted of a non-selected MI-population aged less than 65 years (n = 158), who were receiving standard care. The rehabilitation programme did not increase the health-care costs of post-MI care, as the increase in cost due to participation in the programme was balanced by a decrease in readmissions for cardiovascular diseases. On average, the rehabilitated patient returned to work more frequently, resulting in decreased costs due to loss of production. The mean patient total cost of a 5-year MI follow-up was SEK 73,500 lower in the rehabilitated group. The outstanding winner of the rehabilitation programme was the Swedish National Health Insurance System (NHIS). It must be concluded that the comprehensive cardiac rehabilitation programme is a major strategy that leads to both lowered costs and positive health effects. The cardiac rehabilitation programme is therefore highly cost-effective.

Cardiology Service, Hospital↗

Mucoepidermoid carcinoma of the lacrimal gland. Report of a case with oncocytic features arising in a patient with chronic dacryops.

A 62-year-old woman had recrudescence of growth of a lacrimal gland fossa cystic mass present for more than 40 years. Results of histopathologic examination of the excised specimen showed infiltrating nests of epidermoid and mucin-producing cells, consistent with a mucoepidermoid carcinoma. Also present were numerous large oncocytic cells partially lining the lumens of the multiloculated cyst and penetrating the adjacent stroma. To the authors' knowledge, this is the first reported case of mucoepidermoid carcinoma with prominent oncocytic features arising in a previously documented chronic cystic lesion of the lacrimal gland. Because of the population of oncocytes (a metaplastic phenomenon encountered in ductular epithelial cells) among the cells lining the cyst, the authors conclude that the carcinoma arose from a long-standing dacryops. This conclusion was also supported by the electron microscopic demonstration of duct-type secretory granules within the mitochondria-rich oncocytes.

Carcinoma↗

Bioluminescence in oceanology.

For analytical purposes bioluminescence can be used in three main ways: 1. luminescence measurement of bioluminescent system components isolated in vitro; 2. determination of luminous organisms' reaction to the in vivo test-action; 3. measurement of bioluminescence in marine ecological systems. The majority of the reports of this Symposium are dealing with the first two topics. The aim of our presentation is to draw attention to the third one. The possibilities of bioluminescent analysis are wider than its traditional scheme of applications in the laboratory, when the emitting system is withdrawn from a native source and is placed in a cuvette of the light measuring device. The reverse scheme is also possible, i.e. the device can be introduced into light emitting system such as a marine biocenosis--the community of the sea inhabitants--where we obtain a highly sensitive and rapid means of gaining the information on the vital activity of marine ecosystems, i.e. their spatial structure, rhythms, man's influence upon them, etc. The present communication will consider the possibilities of this form of bioluminescent analysis.

Circadian Rhythm↗

[Complex treatment of complications of liver cirrhosis].

The authors have performed 179 endovascular operations in 87 patients with complicated forms of cirrhosis of the liver using different successions of embolisation of the hepatic and splenic arteries, percutaneous transhepatic embolization of the gastric and esophageal veins, balloon occlusion of the vena cava inferior in combination with operations of the root vascular anastomoses (in 10 patients) and operations on the thoracic lymphatic duct. The complex and stepwise treatment of complications of cirrhosis by these methods resulted in an effective arrest of the ascites syndrome and lower portal pressure.

Adult↗

[Angiographic evaluation of the results of roentgeno-endovascular occlusion of the hepatic artery].

Angiographic examinations of 42 patients after percutaneous embolization of the hepatic artery system were performed for dearterialization of the tumour or reduction of the arterial bloodflow in cirrhosis of the liver complicated by portal hypertension. High effectiveness of metallic spiral emboli was revealed for the creation of stable permanent action on different portions of the hepatic artery. The results obtained show high efficiency of proximal embolization of the hepatic artery in treatment of tumors and cirrhosis of the liver and its advantages over the surgical ligation.

Adult↗

Economic consequences of postinfarction prophylaxis with beta blockers: cost effectiveness of metoprolol.

Treatment with certain beta adrenoceptor blocking agents after myocardial infarction reduces mortality and the incidence of reinfarction. Data from a randomised placebo controlled study of the beta 1 selective blocker metoprolol given as secondary prophylaxis were therefore analysed for the possible cost effectiveness of extending this treatment to the general population of patients with myocardial infarction. Metoprolol 100 mg twice daily and matching placebo were given to 154 and 147 patients, respectively, for three years. During this period drug costs for the beta blocker, digitalis, and diuretics were analysed as well as costs of readmission for cardiac problems and indirect costs arising from sick leave or early retirement. Active treatment with metoprolol significantly reduced costs of readmission as well as indirect costs. The net effect per patient over the three years was a reduction of roughly kr 19,000 (1930 pounds). These results suggest that beta blocker treatment given as secondary prophylaxis after myocardial infarction is highly cost effective.

Aged↗

The spectrum of orbital aspergillosis: a clinicopathological review.

Orbital aspergillosis is an uncommon but serious infection that may first present to the ophthalmologist. Usually arising from the paranasal sinuses, it may present in manifold ways within the orbit. Some presentations, such as optic nerve involvement, can respond to systemic corticosteroids, leading to delays in diagnosis and possibly iatrogenic potentiation of the infectious process. In this review, pertinent clinical and radiographic findings are discussed, and the literature is summarized. Classic approaches to therapy include local treatment, debridement, and systemic amphotericin B. We review novel approaches to treating orbital aspergillosis and detail a flow-chart for its management. Four patients from the spectrum of orbital aspergillosis are also described: initially presenting as an infection of an exenteration socket, a complex dacryocystitis, and optic nerve tumor, and post-operative periorbital swelling. Physicians should be familiar with the clinical spectrum of disease and the variable presentation of this infection, as early diagnosis and rapid institution of appropriate therapy are crucial elements in the management of invasive aspergillosis. In the neutropenic or otherwise immunocompromised patient, a high index of suspicion must be maintained as delays in diagnosis of fulminant aspergillosis may lead to overwhelming and rapidly progressive infection. Obtaining adequate diagnostic material for pathological and microbiological examination is critical. Newer methods of therapy, particularly itraconazole and liposomal amphotericin B, may be beneficial in selected patients.

Adult↗

Animal and culture models of glaucoma for studying neuroprotection.

PURPOSE: Neuroprotection aims to treat nervous system disease by maintaining the health and function of neurons. The final proof of the neuroprotective strategy relies on randomized, controlled clinical trials, but the choice of which agents to study for these trials depends on studies in the laboratory using culture and animal models. Most culture models for studying ocular neuroprotection use retinal cells, and a range of mechanisms can be studied in culture, e.g. axotomy and serum or growth factor deprivation. METHODS: A variety of animal models are available for studying neuroprotection as possible therapy for glaucomatous optic neuropathy. Those most closely related to glaucoma are probably associated with moderate elevation of the intraocular pressure to levels similar to those seen in patients with untreated glaucomatous optic neuropathy. CONCLUSIONS: Care should be taken when applying the results of these models to humans, and there is no single criterion for deciding which culture or animal model is most relevant to the clinical situation. The most important feature is whether the model's results correlate with clinical results, and this information will only become available over time, as randomized clinical trials are completed.

Animals↗

Intrinsic survival mechanisms for retinal ganglion cells.

Retinal ganglion cells (RGCs) undergo programmed cell death (apoptosis) after axonal injury. This cell death is mediated by several mechanisms, including deprivation of neurotrophic factors, alterations in gene expression, and production of reactive oxygen species. However, death of RGCs is delayed after axonal injury, and a significant number survive even after several days. This suggests that RGC death is not an immediate result of axonal injury, and that other pro-survival factors may play a role. While we and other researchers have focused on the mechanisms of cell death after axonal injury, it may be that determining the regulation of cell survival mechanisms may lead to innovative methods for neuroprotection. The final common pathway of glaucomatous optic neuropathy is RGC death, probably via damage to their axons occurring at or near the lamina cribrosa. Axonal injury leads directly (1) or indirectly (2) to the death of retinal ganglion cells. We and others have demonstrated that axotomy is associated with RGC apoptosis (3-7) as well as specific changes in expression of certain genes at the mRNA and protein level (8, 9). Reactive oxygen species may also be part of the pathway for RGC death (10, 11). We therefore hypothesize that axotomy leads to molecular events that are potentially destructive to RGCs, but also induces changes that are potentially protective against cellular injury. If this is the case, then RGC death from axonal injury would result not only from initiation of apoptosis, but also from failure of intrinsic neuroprotective mechanisms. It should therefore be theoretically possible to modulate these two classes of responses, and thus improve RGC cell survival after axotomy.

Animals↗

[On the vertical distribution of microorganisms in lake Baikal during spring deep-water renewal].

The vertical distribution of microorganisms during spring deep-water renewal in Lake Baikal was studied. The downward advection of trophogenic waters was found to create conditions for the extensive growth of microorganisms capable of decomposing and mineralizing organic carbon, nitrogen, and phosphorus in deep water layers. These processes occur annually at spring thermal bars near the underwater slope of Lake Baikal, whereas in its pelagic zone, the deep intrusions of waters rich in organic material are observed only in the years when enhanced deep-water renewal is accompanied by a high spring yield of phytoplankton.

Bacteria↗