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Biomedical subjects

C Sommer

Publications and source records attributed to C Sommer.

At least 127 records · Page 7Linked to original sources

[Quality assurance and quality improvement. Personal experiences and intentions].

In may 1994 we were selected by the surgical Swiss association to make a study about quality in USA. During our travel we visited 3 types of institutions: Hospitals, National Institute of standard and Technology, Industry, Johnson & Johnson. We appreciate to compare 2 types of quality programs: Quality Assurance (QA) and Continuous Quality Improvement (CQI). In traditional healthcare circles, QA is the process established to meet external regulatory requirements and to assure that patient care is consistent with established standards. In a modern quality terms, QA outside of healthcare means designing a product or service, as well as controlling its production, so well that quality is inevitable. The ideas of W. Edward Deming is that there is never improvement just by inspection. He developed a theory based on 14 principles. A productive work is accomplished through processes. Understanding the variability of processes is a key to improve quality. Quality management sees each person in an organisation as part of one or more processes. The job of every worker is to receive the work of others, add value to that work, and supply it to the next person in the process. This is called the triple role the workers as customer, processor, and supplier. The main source of quality defects is problems in the process. The old assumption is that quality fails when people do the right thing wrong; the new assumption is that, more often, quality failures arise when people do the wrong think right. Exhortation, incentives and discipline of workers are unlikely to improve quality. If quality is failing when people do their jobs as designed, then exhorting them to do better is managerial nonsense. Modern quality theory is customer focused. Customers are identified internally and externally. The modern approach to quality is thoroughly grounded in scientific and statistical thinking. Like in medicine, the symptom is a defect in quality. The therapist of process must perform diagnostic test, formulate hypotheses of cause, test those hypotheses, apply remedies, and assess the effect of remedies. Total employee involvement is critical. A power comes from enabling all employees to become involved in quality improvement. A great advantage of CQI is the prevention orientation of the concept. The CQI permeated a collegial approach, people learn how to work together to improve. CQI is a time consuming procedure. During our travel we learned the definition of quality as the customer satisfaction. To build a CQI concept in employed time but all employed are involved in quality improvement. Applying CQI we could be able to refuse Quality control programs.

Consumer Behavior↗

Adult Toxocara canis encephalitis.

A 48-year-old patient with Toxocara canis infection developed severe ataxia, rigor and neuropsychological disturbances. An aetiology was proven by an indirect immunofluorescence test. CT and MRI revealed both diffuse and circumscribed white matter lesions. Angiography showed multiple occlusion of branches of the middle cerebral artery. Anthelminthic treatment was beneficial in the initial stage of the disease, but had no effect on progression of CNS symptoms. Immunosuppressive therapy with prednisolone and azathioprine yielded partial recovery and stabilisation of the patient.

Animals↗

Foot movement and tendon excursion: an in vitro study.

The purpose of this study was to determine tendon excursions resulting from selected foot movement and to derive moment arms with respect to the eversion-inversion and flexion-extension axes of the foot. A lower leg-holding device with 6 degrees of freedom was used for the in vitro investigation of 15 fresh foot-leg specimens. Although high variation among the subjects existed, there was a pronounced uniformity of tendon excursion throughout a given foot eversion-inversion or flexion-extension range of motion. With reference to the tibialis posterior (1.00), average invertor moment arms with respect to the foot eversion-inversion axis were found to be as follows: flexor digitorum longus, 0.75; flexor hallucis longus, 0.62; tibialis anterior, 0.59; soleus, 0.24; extensor hallucis longus, 0.22; extensor digitorum longus, -0.26; peroneus longus, -0.82; and peroneus brevis, -0.85. A trend toward decreasing evertor/invertor moment arms was observed during the ranges of foot eversion, as well as when the foot was in flexion. Flexor and extensor moment arms were found to be substantially dependent on foot flexion-extension angle. Increasing flexor moment arms were observed when rotating the foot throughout the range from extension to flexion. The obtained results may have significant implications in foot surgery, muscle function analysis, and general considerations of foot function.

Aged↗

[Epidemiology, treatment and long-term results of spinal fractures at a non-university affiliated central hospital with special reference to fractures of the lumbar spine].

In a retrospective study epidemiology, treatment, clinical and radiological results of 283 patients with spine fractures in a five-year period are presented. The operation rate ranges from 42% of the cervical to 9% of the thoracical and 24% of the lumbar spine. We found good radiological results concerning the correction of the wedge compression and the collapse of the lumbar vertebral body by fixation with an internal fixator. After a follow-up of 2-5 years nearly 80% of conservative as well as operative treated patients had more or less residual back pain. Because there is a correlation between the quantity of pain and the radiological dislocation, exact initial diagnosis, without overlooking an instability, and adequate conservative or operative treatment is very important.

Adolescent↗

Changes with time after treatment in the concentrations of ivermectin in fresh cow dung and in cow pats aged in the field.

An analytical procedure for detection of ivermectin in plasma samples was modified and used for measuring ivermectin concentrations in dung samples. The residues were quantified by high-performance liquid chromatography and fluorescence detection after extraction, purification, and derivatization into fluorescent reaction products. The concentrations of ivermectin in dung were measured after dosing heifers with 0.2 mg kg-1 by subcutaneous injection or 0.5 mg kg-1 by pour-on. Despite the 2.5 times higher pour-on dose, this formulation did not result in excretion of detectable concentrations of ivermectin over a longer period of time than did the injection treatment. Dung pats with ivermectin residues were exposed on grazing pastures until they were no longer colonised by flies and beetles. In the experiments performed under temperate and tropical conditions, the aging of the pats did not lead to a significant lowering of the concentrations of ivermectin. Flies or beetles colonising the pats some time after deposition may therefore not be exposed to decreased levels of ivermectin.

Administration, Topical↗

Attractiveness of dung from ivermectin-treated cattle to Danish and afrotropical scarabaeid dung beetles.

The effect of ivermectin treatment of cattle on the attractiveness of dung to scarabaeid dung beetles was assessed by pitfall trapping in Denmark, Tanzania and Zimbabwe. Traps were baited with dung collected at intervals after heifers were treated with ivermectin by subcutaneous injection (0.2 mg kg-1 body weight). In one Danish trial, beetles preferred control dung from untreated cattle, whereas no preference was found in two other experiments. In Tanzania, the overall tendency for beetles was also to prefer control dung. In Zimbabwe, two species (Euoniticellus intermedius and Liatongus militaris) were particularly attracted to dung from treated cattle, whereas three others did not discriminate between dung types. It is concluded that at least in some cases the attractiveness of cattle dung to scarabaeid beetles is affected by avermectin therapy. Beetle discrimination between dung types is probably attributable to some unknown side effect of the treatment rather than being a direct response to the drug itself.

Analysis of Variance↗

Effects of ivermectin on two afrotropical dung beetles, Onthophagus gazella and Diastellopalpus quinquedens (Coleoptera: Scarabaeidae).

Subcutaneous injection of 0.2 mg kg-1 ivermectin to heifers negatively affected larvae of the afrotropical dung beetles, Diastellopalpus quinquedens and Onthophagus gazella, developing in the dung. Although closely related, the two species seem to differ in susceptibility; 28% of brood masses made of dung voided 2 days after treatment contained third instar D. quinquedens, whereas O. gazella died as first instars in dung voided up to 8 days after treatment. Folding of the head capsules and lack of mandibular wear in the dead O. gazella larvae suggest that ivermectin could be absorbed through the integument and prevent normal feeding and distension of the head capsule. In addition, the surviving third instar O. gazella in dung voided 16 days after treatment had significantly reduced clypeal and mandibular widths. The dung burial activity, mainly by D. quinquedens, estimated in a field experiment was not affected by ivermectin residues in the dung.

Animals↗

NMDA and glycine receptor mRNA expression following transient global ischemia in the gerbil brain.

Excitotoxic activation of postsynaptic N-methyl-D-aspartate (NMDA) receptors is thought to be a key event for the molecular pathogenesis of postischemic delayed neuronal death in CA1 hippocampus. To assess a possible interference of ischemia with NMDA receptor expression, transcription of the NMDA receptor 1 (NMDA-R1) gene was examined by in situ hybridization in the gerbil brain after 5 min of global ischemia and various recirculation intervals. In normal gerbil brain, NMDA-R1 was strongly expressed and equally abundant in CA1 and CA3 neurons. After ischemia, expression remained unchanged for 24 h, followed by a selective decline in mRNA levels in CA1 neurons, resulting in the complete disappearance of hybridization signals after 4 days. NMDA-R1 expression in forebrain neurons less vulnerable or resistant to ischemia including CA3 and dentate granule cells remained unchanged. Similar in situ data were obtained for the beta subunit of the inhibitory glycine receptor (Gly-R). This subunit is also abundantly expressed in the pyramidal cell layer of the hippocampus, but not known to be involved in the mechanisms of post-ischemic excitotoxicity.

Animals↗

Pathology of experimental compression neuropathy producing hyperesthesia.

An experimental neuropathy in rats produced by tying loosely constrictive ligatures around one sciatic nerve has recently been shown to produce pain-related behavior that follows a reproducible time course. In the present study, we assessed the degree of thermal hyperesthesia and examined the sciatic nerves by light and electron microscopy at different time points from 1 day to 12 weeks after surgery. Edema was the initial pathologic change seen in the neuropathy and was associated with early Wallerian degeneration on day 1. Injury to the connective tissue sheaths with interruption of the perineurial layer, infiltration of macrophages into the endoneurium, and proliferation of endothelial cells were observed during the first week. Endothelial cells hypertrophied and changed to a rhomboid shape with gaps between adjacent cells. Most large myelinated and many small myelinated fibers underwent Wallerian degeneration. Unmyelinated fiber numbers were reduced to one-third of the normal value from day 5 to day 14. Axonal sprouts were numerous after 1 week and grew into the segment distal to the ligatures by 4 weeks. Aberrant sprouts in minifascicles outside the perineurium were present from 4 weeks on. The original ligatures were rapidly surrounded by large amounts of fibrous tissue and mostly absorbed by 12 weeks; the initial fascicular compression caused by the ligatures was maintained by the fibrous tissue. We conclude that, whereas neuroma formation may contribute to the pain-related behavior in the later stages of this neuropathy, acute changes in the endoneurial microenvironment are important for its initial development.

Animals↗

Noninvasive assessment of intracranial fistulas and other small arteriovenous malformations.

Twenty patients in whom the diagnosis of an intracranial arteriovenous malformation was suspected either by the history and clinical findings or by abnormal periorbital Doppler flow are discussed. Sixteen patients had only minor complaints or inconclusive signs or were clinically asymptomatic; 4 others presented with the syndrome of a carotid cavernous fistula. Patients were further examined by means of transcranial Doppler sonography, computed tomographic scanning, and cerebral angiography. In 17 patients, the diagnosis of an arteriovenous malformation could be established by transcranial Doppler sonography and could be confirmed by angiography. Transcranial Doppler sonography gave false negative results in 1 and false positive results in 2 patients. Our findings demonstrate the usefulness of modern ultrasound techniques in the assessment of small or even occult intracranial arteriovenous shunts before subjecting patients to more invasive procedures.

Adolescent↗

Reduced splash dispersal of bovine parasitic nematodes from cow pats by the dung beetle Diastellopalpus quinquedens.

From a thoroughly mixed portion of cattle feces with Cooperia sp. eggs, 1-kg artificial pats were placed in 6 buckets containing 6 kg of soil each. Ten dung beetles, Diastellopalpus quinquedens, were added to each of 3 buckets. The remaining 3 buckets served as controls without beetles. When infective parasite larvae (L3) had developed in the cow pats indoors, the following procedure was followed. During occasions of rainfall each bucket was placed outdoors in the center of a wider and higher container. When the rain stopped all buckets were brought indoors, and infective larvae spread by splash droplets during the rain were collected in the containers and counted. After 33 days, the remaining dung on the soil surface in buckets with dung beetles constituted only 38% of that in the controls. Moreover, the number of L3 in feces left on the soil surface in the buckets with beetles was reduced by 88%, presumably due to beetle activity. This may explain the 70-90% reduction in splash dispersal of L3 of Cooperia sp. from cow pats attacked by beetles. The dung-burying activity of the beetles did not result in increased numbers of L3 in the soil under the cow pats, suggesting that many of the parasites in buried feces were destroyed.

Animals↗

[Damage to the lateral cutaneous femoral nerve after transfemoral angiography].

We report on two patients with lesions of the lateral cutaneous nerve of the thigh after transfemoral angiography. Symptoms were hypesthesia, dysesthesia and hypalgesia of the right lateral thigh. One patient had no hematoma, the other a hematoma of the medial thigh which did not enlarge thigh circumference. Both patients had had a tight pressure bandage applied for 24 hours. There were no signs of a femoral nerve lesion. Both patients were severely distressed by paresthesia. The numbness subsided after three weeks in one patient, but pain persisted. The other patient had symptoms for over six months. The lateral cutaneous nerve of the thigh is located distinctly lateral to the puncture site in transfemoral angiography. Hence we suggest that the nerve lesion was caused neither by the puncture itself nor by a hemorrhage, but by the tight bandage.

Aged↗

[Temporary balloon catheter occlusion for control of bleeding of a blunt injury of the proximal axillary artery. Case report and review of the literature].

We describe the successful placement of an intra-arterial balloon catheter by a femoral approach in order to occlude the proximal arterial end and to control massive bleeding in a patient with rupture of the left axillary artery after blunt scapulo-thoracic dissociation. To our knowledge this technique has so far not been reported in Europe. It allows rapid control of bleeding, minimizes blood loss and markedly facilitates pre- and perioperative management in selected cases. The authors review the relevant literature dealing with this topic.

Adult↗

Mitochondrial abnormalities in human sural nerves: fine structural evaluation of cases with mitochondrial myopathy, hereditary and non-hereditary neuropathies, and review of the literature.

Fifteen cases of mitochondrial myopathy, three cases of hereditary motor and sensory neuropathy (HMSN) VI, and 280 cases of neuropathies of different etiologies were examined by electron microscopy for the presence of mitochondrial abnormalities in the sural nerve. Altered mitochondrial were found in most cases of mitochondrial myopathy, in all cases of HMSN VI, and in 25 cases out of the series of unselected neuropathies. The mitochondrial changes comprised enlargement with an amorphous matrix and distorted cristae, with hexagonal paracrystalline inclusions, and with prominent cristae containing oblique striations, and a variety of rare changes. Most mitochondrial abnormalities were found in Schwann cells. An increase of the number of mitochondria was noted in smooth muscle and endothelial cells of epineurial arterioles of two cases with mitochondrial encephalomyopathy. Neuropathy was present in all cases of mitochondrial myopathy according to morphometrical analysis. Whether neuropathy is caused directly by mitochondrial dysfunction or by other pathogenetic mechanisms remains to be determined.

Hereditary Sensory and Autonomic Neuropathies↗

[Immunotherapy of chronic Guillain-Barré syndrome with high dose IgG and cyclosporin A. Case report, review of the literature and perspectives].

We report about the three-year treatment of a patient with chronic relapsing Guillain-Barré syndrome (GBS), who, simultaneously, suffered from benign gammopathy. A casual relationship between the two diseases could not be proven, since specific antimyeline antibodies could not be found. Five severe bouts of the disease occurred during the observation period, only the first two relapses, however, showed improvement with cortisone treatment, while the latter did not so. High dosages of 7S-immunoglobuline, by contrast, led to a rapid improvement during each of the subsequent relapses. The additional therapy with ciclosporine A kept the patient free from neurological deficits for more than six months now. The mechanisms of various immunological therapeutic approaches are discussed, particularly as an alternative to plasmapheresis. Our observation, as well as theoretical considerations, suggest the aforementioned immunological treatment being promising in chronic GBS.

Aged↗

Prostaglandin E2 inhibits secretagogue-induced enzyme secretion from rat pancreatic acini.

Prostaglandins of the E type may have a potential role in pancreatic physiology and pathophysiology. Because prostaglandins of the E type inhibit HCl secretion in parietal cells via a specific receptor by inhibition of adenylylcyclase, we studied whether a similar mechanism exists in the exocrine pancreas. Isolated rat pancreatic acini were incubated with various concentrations of secretagogues, such as cholecystokinin-octapeptide (CCK-8), bombesin, carbachol, and vasoactive intestinal peptide (VIP), in the absence or presence of prostaglandin E2 (PGE2), and amylase secretion was measured. For receptor binding studies, acini and pancreatic membranes were incubated with [3H]PGE2 and either unlabeled PGE2 or other types of prostaglandins. PGE2 (10(-13) to 10(-5) M) did not inhibit basal amylase secretion. However, CCK-8-stimulated secretion was significantly inhibited. Stimulation of secretion by bombesin, carbachol, VIP, and secretin was also inhibited by PGE2, but not as pronounced as CCK-8-stimulated secretion. The formation of inositol 1,4,5-trisphosphate induced by CCK-8 was markedly inhibited by simultaneous incubation with PGE2. Furthermore, PGE2 slightly but significantly reduced the CCK-8-induced efflux of 45Ca2+ from prelabeled acini. Intact acini and a membrane fraction bound [3H]PGE2 and this function could be equally competed by either unlabeled PGE2 or PGE1 in contrast to less-related prostaglandins such as PGF2 alpha, PGD2, and prostacyclin. We conclude that prostaglandins of the E type inhibit pancreatic enzyme secretion stimulated by various secretagogues. This function is mediated via specific receptors for PGE. With regard to CCK-8-stimulated secretion this function may be mediated by an inhibition of formation of inositol 1,4,5-trisphosphate.

Amylases↗

Resistance to benzimidazole anthelmintics in small strongyles (Cyathostominae) of horses in Denmark.

This study was undertaken to establish whether anthelmintic resistance was present in nematode parasites of horses in Denmark. Sixteen horse farms were selected for faecal egg count reduction (FECR) tests to measure the efficacy of the anthelmintic used. Resistance to benzimidazole anthelmintics was found on 13 of the 16 farms, with FECR values ranging from 80.0% to -101.3%. On the remaining 3 farms FECR was 100.0%, 99.3% and 97.2%. Results of a questionnaire study on anthelmintic usage, parasite control measures and management practices showed that horses in this study were treated on average 7.1 times/year. Horse owners changed between preparations of drugs but almost only within the same class of anthelmintics. Nine owners gave an anthelmintic treatment to purchased horses before they were introduced on the farm. On 14 farms, the same paddock was grazed every year and the average stocking rate was estimated to be 2.4 horses/ha. Strategies to avoid development of anthelmintic resistance are discussed and recommendations of parasite control on horse farms are presented.

Animals↗

Desmin and actin associated with cytoplasmic bodies in skeletal muscle fibers: immunocytochemical and fine structural studies, with a note on unusual 18- to 20-nm filaments.

In a fine structural and immunocytochemical study, the latter performed on semithin sections of epoxy resin embedded skeletal muscle fibers, three types of cytoplasmic bodies were identified in a case of cytoplasmic body myopathy: (1) The first type, the classical type, showed a central core and a light halo with radiating actin filaments at the periphery. (2) The second type, the spheroid body was characterized by irregularly arranged granular masses associated with intermediate filaments. Desmin immunoreactivity occurred in the central and peripheral parts, where filaments of intermediate size were visualized by electron microscopy. Desmin immunoreactivity was noted also at the Z-bands of striated annulets, within areas of disordered myofibrils, such as sarcoplasmic masses, and in atrophic muscle fibers. (3) The third type of the cytoplasmic body was composed mainly of large masses of uneven granularity and electron density. The center of this type reacted to anti-actin antibody suggesting that the 5- to 6-nm filaments, which ultrastructurally proved to be a major component, were of the actin type. By contrast, neither intermediate filaments nor actin microfilaments were found by electron microscopy in cytoplasmic bodies in a second case where no immunoreaction to desmin or actin occurred. Anti-vimentin antibody stained only the cytoplasm of endomysial cells, but not the inclusion bodies. Some other, unusual inclusions with 18- to 20-nm tubulo-filamentous structures have to be distinguished from the various types of filaments in cytoplasmic bodies. It is concluded, that pleomorphism and heterogeneity of "cytoplasmic bodies" have to be taken into consideration when classifying cytoplasmic body myopathies.

Actins↗