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排序方式: 共有408条查询结果,搜索用时 15 毫秒
21.
NK Thalange PJ Foster MS Gill DA Price PE Clayton 《Archives of disease in childhood》1996,75(5):427-431
Overheating may cause terminal apnoea and cot death. Rectal temperature and breathing patterns were examined in normal infants at home during the first 6 months of life. Twenty one infants had continuous overnight rectal temperature and breathing recordings for 429 nights (mean 20.4 nights, range 7-30) spaced over the first six months of life. Periods when breathing was 'regular' were directly marked on single night records. Sleep state was determined from respiratory variables. 'Regular' breathing was a reliable marker of 'quiet' sleep (specificity 93%). The duration of 'quiet' sleep increased from 6 to 22 minutes from two weeks to three months of age and then remained static, as did the proportion of sleep spent in the quiet phase (9% to 34%). Rectal temperature fell during 66% of quiet sleep and usually rose during rapid eye movement (REM) sleep. The drop in rectal temperature was maximal at the start of quiet sleep, whereas the maximum rise during REM sleep was reached after 10 to 15 minutes. Oscillations in rectal temperature are associated with changes in sleep and breathing state. The maturation of rectal temperature patterns during the first six months of life are closely related to a maturation of sleep state and breathing patterns. 相似文献
22.
H Thom PE Carter P Duffty MJC Main S Brown 《Acta paediatrica (Oslo, Norway : 1992)》1994,83(7):687-691
Immunoglobulin G subclass concentrations were measured in paired foetal (cord) and maternal serum specimens at delivery from 27 IgA-deficient (serum IgA < 0.01 g/l) and 15 control women. IgA-deficient women had significantly higher serum IgGl and IgG3 concentrations than control women but 2 of the group had concomitant IgG2/IgG4 deficiency and a further 12 had low IgG4 concentrations (serum IgG4 < 0.025 g/l). Foetal serum also had significantly higher IgGl concentrations than control foetal serum but lower IgG2 and IgG4 levels. Concentrations of IgG subclasses and IgM were measured in breast milk collected on the fifth day postpartum from 19 of these IgA-deficient and 18 control women. Between-group differences in IgG subclass levels resembled those in serum. Compared with serum, proportionally less IgG3 was present in milk in both groups although the contribution of IgG3 to total IgG was not less than that of IgG4. Slightly higher IgM was found in milk from the IgA-deficient mothers. 相似文献
23.
Magnetic resonance imaging of benign mediastinal masses 总被引:1,自引:0,他引:1
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Hale JD; Valk PE; Watts JC; Kaufman L; Crooks LE; Higgins CB; Deconinck F 《Radiology》1985,157(3):727-733
Multisection, dual-echo magnetic resonance (MR) transaxial images of blood vessels contain both anatomic and qualitative information about flow. Even so, the images are produced as a series of two-dimensional tomographic sections from which full visualization of connected structures is difficult. A computer algorithm was developed that automatically detects flowing blood based on pixel intensity and calculated T2 and provides reconstructed views of vessels while analyzing and displaying flow characteristics. Images of abdominal vessels, aortic aneurysms, and the heart were encoded by flow and color to demonstrate depth. In addition, these data were reconstructed to derive a more accurate assessment of patency. With this technique, transaxial images can be used to analyze flow patterns, determine patent areas, and visualize all levels of vessels in a single image. 相似文献
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论我国医疗美容产业的可持续发展 总被引:4,自引:1,他引:3
目的探讨我国医疗美容事业的产业化属性、经济学地位,以及如何达到全面、协调和可持续发展的大目标。方法逻辑论证。结果认识到医疗美容产业是“医疗美容经济”系统的核心要素;揭示了医疗美容产业具有“人本经济”的特征,民营医疗美容产业是发展医疗美容事业的重要力量,医疗美容产业的发展是当代中国医学美学与美容医学整体学科建设和发展的社会基础和经济基础。结论医疗美容产业的形成是医疗美容事业在社会主义市场经济条件下发展的必然趋势,同时提出了医疗美容产业健康发展的三大措施:增强产业意识;加强行业规范;实行人本管理。最终的结论是:医疗美容事业利用产业化机制,走产业化发展的道路,促进了整个社会医疗美容事业的全面、协调和可持续发展。 相似文献
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Sensory neurons that innervate the heart sense ischemia and mediate angina. To use patch-clamp methods to study ion channels on these cells, we fluorescently labeled cardiac sensory neurons (CSNs) in rats so that they could later be identified in dissociated primary culture of either nodose or dorsal root ganglia (DRG). Currents evoked by a variety of different agonists imply the importance of lowered pH (=7.0) in signaling ischemia. Acidic pH evoked extremely large depolarizing current in almost all cardiac afferent neurons from the DRG (CDRGNs). In contrast, only about half of the unlabeled DRG neurons responded to acid, and their current amplitudes were much less than that in CDRGNs. In all respects tested--kinetics, selectivity, and pharmacology--the acid-evoked current was similar to that of previously described native and cloned acid-sensing ion channels. Cardiac afferents from the nodose ganglia differed from CDRGNs in having smaller acid-evoked currents but clearly larger currents evoked by ATP. Serotonin, acetylcholine, bradykinin, and adenosine elicited currents in fewer CSNs than did ATP or lowered pH, and the currents were relatively small. Capsaicin, an activator of small nociceptive sensory neurons that innervate skin, evoked only small and rare currents in CDRGNs. The extremely large amplitude and prevalent expression of acid-evoked current in CSNs imply a critical role for acidity in sensation associated with myocardial ischemia. 相似文献