全文获取类型
收费全文 | 5824篇 |
免费 | 423篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 40篇 |
儿科学 | 200篇 |
妇产科学 | 139篇 |
基础医学 | 656篇 |
口腔科学 | 42篇 |
临床医学 | 1049篇 |
内科学 | 1041篇 |
皮肤病学 | 167篇 |
神经病学 | 593篇 |
特种医学 | 100篇 |
外科学 | 622篇 |
综合类 | 72篇 |
一般理论 | 8篇 |
预防医学 | 678篇 |
眼科学 | 107篇 |
药学 | 335篇 |
中国医学 | 2篇 |
肿瘤学 | 418篇 |
出版年
2023年 | 58篇 |
2022年 | 48篇 |
2021年 | 192篇 |
2020年 | 86篇 |
2019年 | 170篇 |
2018年 | 202篇 |
2017年 | 134篇 |
2016年 | 161篇 |
2015年 | 160篇 |
2014年 | 223篇 |
2013年 | 346篇 |
2012年 | 442篇 |
2011年 | 456篇 |
2010年 | 232篇 |
2009年 | 225篇 |
2008年 | 360篇 |
2007年 | 383篇 |
2006年 | 369篇 |
2005年 | 389篇 |
2004年 | 345篇 |
2003年 | 330篇 |
2002年 | 267篇 |
2001年 | 48篇 |
2000年 | 40篇 |
1999年 | 50篇 |
1998年 | 55篇 |
1997年 | 50篇 |
1996年 | 31篇 |
1995年 | 50篇 |
1994年 | 30篇 |
1993年 | 21篇 |
1992年 | 15篇 |
1991年 | 17篇 |
1990年 | 21篇 |
1989年 | 15篇 |
1988年 | 11篇 |
1987年 | 24篇 |
1986年 | 18篇 |
1985年 | 21篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1982年 | 9篇 |
1981年 | 8篇 |
1980年 | 11篇 |
1979年 | 14篇 |
1977年 | 7篇 |
1976年 | 15篇 |
1972年 | 9篇 |
1968年 | 9篇 |
1966年 | 6篇 |
排序方式: 共有6269条查询结果,搜索用时 15 毫秒
1.
2.
3.
Victoria A. Chang Dawn M. Meyer Brett C. Meyer 《Journal of stroke and cerebrovascular diseases》2019,28(1):163-166
Background
Acute stroke codes may be activated for anisocoria, but how often these codes lead to a final stroke diagnosis or alteplase treatment is unknown. The purpose of this study was to assess the frequency of anisocoria in stroke codes that ultimately resulted in alteplase administration.Methods
We retrospectively assessed consecutive alteplase-treated patients from a prospectively-collected stroke registry between February 2015 and July 2018. Based on the stroke code exam, patients were categorized as having isolated anisocoria [A+(only)], anisocoria with other findings [A+(other)], or no anisocoria [A?]. Baseline demographics, stroke severity, alteplase time metrics, and outcomes were also collected.Results
Ninety-six patients received alteplase during the study period. Of the 94 who met inclusion criteria, there were 0 cases of A+(only). There were 9 cases of A+(other) (9.6%). A+(other) exhibited higher baseline National Institutes of Health (NIH) Stroke Scale scores compared to A? (17 versus 7; P?=?.0003), and no additional differences in demographics or alteplase time metrics. Final stroke diagnosis and other outcome measures were no different between A+(other) and A?. Of the A+ patients without pre-existing anisocoria, 5 of 6 (83%) had posterior circulation events or diffuse subarachnoid hemorrhage.Conclusions
In this exploratory analysis, zero patients with isolated anisocoria received alteplase treatment. Anisocoria as a part of the neurologic presentation occurred in 10% of alteplase patients, and was strongly associated with a posterior circulation event. Therefore, we conclude that anisocoria has a higher likelihood of leading to alteplase treatment when identified in the presence of other neurologic deficits. 相似文献4.
Nirmanmoh Bhatia Buddhadeb Dawn Tariq S. Siddiqui Marcus F. Stoddard 《Texas Heart Institute journal / from the Texas Heart Institute of St. Luke's Episcopal Hospital, Texas Children's Hospital》2015,42(1):16-24
Determining aortic stenosis (AS) severity is clinically important. Calculating aortic valve (AV) area by means of the continuity equation assumes a circular left ventricular outflow tract (LVOT). The full impact of this assumption in calculating AV area is unknown. Predictors of noncircular LVOT shape in patients with AS are undefined.In 109 adult patients with AS who underwent multiplanar transesophageal echocardiography, we calculated AV area by means of the standard continuity method and by a modified method involving planimetric LVOT area.We found 54 circular, 37 horizontal-oval, 8 vertical-oval, and 10 irregular LVOTs. Area derived by direct planimetry correlated better with the modified than the standard continuity method (r=0.89 vs r=0.85; both P=0.0001). Valve areas of patients with mild, moderate, or severe AS by planimetry were more often mischaracterized with use of the standard than modified method (29 vs 18; P <0.0001). Horizontal-oval AV area derived by planimetry (1.28 ± 0.55 cm2) was underestimated by the standard method (1.05 ± 0.47 cm2; P=0.001), but not by the modified method. Congenital AV morphology and low cardiac index were the only multivariate predictors of horizontal-oval shape. Low cardiac index was the only predictor of noncircular shape.More than half our patients with AS had noncircular LVOTs. Using the modified method reduces mischaracterizations of AS severity. Congenital AV morphology and low cardiac index predict horizontal-oval or noncircular shape. These data suggest the value of direct LVOT measurement to calculate AS severity in patients who have congenital AV or a low cardiac index. 相似文献
5.
6.
Dawn S. Milliner 《Acta paediatrica (Oslo, Norway : 1992)》2006,95(S452):27-30
Genetic disorders of mineral metabolism cause urolithiasis, renal disease, and osteodystrophy. Most are rare, such that the full spectrum of clinical expression is difficult to appreciate. Diagnosis is further complicated by overlap of clinical features. Dent's disease and primary hyperoxaluria, inherited causes of calcium urolithiasis, are both associated with nephrocalcinosis and urolithiasis in early childhood and renal failure that can occur at any age but is seen more often in adulthood. Bone disease is an inconsistent feature of each. Dent's disease is caused by mutations of the CLCN-5 gene with impaired kidney-specific CLC-5 chloride channel expression in the proximal tubule, thick ascending limb of Henle, and the collecting ducts. Resulting hypercalciuria and proximal tubule dysfunction, including phosphate wasting, are primarily responsible for the clinical manifestations. Low-molecular-weight proteinuria is characteristic. Definitive diagnosis is made by DNA mutation analysis. Primary hyperoxaluria, type I, is due to mutations of the AGXT gene leading to deficient hepatic alanine–glyoxylate aminotransferase activity. Marked overproduction of oxalate by hepatic cells results in the hyperoxaluria responsible for clinical features. Definitive diagnosis is by liver biopsy with measurement of enzyme activity, with DNA mutation analysis used increasingly as mutations and their frequency are defined.
These disorders of calcium urolithiasis illustrate the value of molecular medicine for diagnosis and the promise it provides for innovative and more effective future treatments. 相似文献
Conclusion
These disorders of calcium urolithiasis illustrate the value of molecular medicine for diagnosis and the promise it provides for innovative and more effective future treatments. 相似文献
7.
8.
Mark S. Wallace Steven G. Charapata Robert Fisher Michael Byas‐Smith Peter S. Staats Martha Mayo Dawn McGuire David Ellis 《Neuromodulation》2006,9(2):75-86
Objective. The safety and efficacy of intrathecal (IT) ziconotide was studied in a randomized, double‐blind, placebo‐controlled trial. Materials and Methods. Patients (169 ziconotide, 86 placebo) with severe chronic nonmalignant pain unresponsive to conventional therapy and a visual analog scale of pain intensity (VASPI score) ≥ 50 mm were treated over a 6‐day period in an inpatient hospital setting. Initial starting dose was 0.4 µg/hour and was titrated to analgesia or intolerance (maximum dose 7.0 µg/hour). The starting and maximum doses were reduced to 0.1 µg/hour and 2.4 µg/hour, respectively, due to adverse events (AEs). Results. The mean percent reduction in VASPI score from baseline was 31.2% and 6.0% for ziconotide‐ and placebo‐treated patients, respectively (p ≤ 0.001). During the initial titration phase, a significantly greater percentage of patients in the ziconotide group compared to the placebo group reported AEs, including abnormal gait, amblyopia, dizziness, nausea, nystagmus, pain, urinary retention, and vomiting. Conclusion. Ziconotide provided significant analgesia in patients for whom conventional therapy failed. However, there was a considerable incidence of ziconotide‐associated AEs due to the rapid titration and high doses administered. 相似文献
9.
Colin W. BINNS Dawn GILCHRIST Beth WOODS Michael GRACEY Jane SCOTT Hannah SMITH 《Nutrition & Dietetics》2006,63(1):8-14
Objective: To document the breastfeeding practices of Aboriginal mothers delivering in Perth. Design and methods: A cohort of mothers was followed from the time of delivery for six months to obtain details of infant feeding practices. Subjects: A total of 455 mothers delivered during the study period and were asked to participate. A total of 425 mothers completed the initial questionnaire. Setting: The study was undertaken in six public hospitals in Perth, Western Australia. Data analyses: The data were analysed using spss . Breastfeeding duration was calculated using Kaplan–Meier survival analysis. Main outcome measures: Breastfeeding initiation and duration. Results: The mean age of the Aboriginal mothers was 21.8 years (range 14–39 years, SD 5.32) and the average gestational age was 38.3 weeks. Almost 50% of the mothers in the study delivered by Caesarean section. At discharge from hospital 89.4% (CI 86.6–92.1) of mothers were breastfeeding, declining to 58.8% (CI 53.5–64.1) at six months. When compared with non‐Aboriginal mothers, the Aboriginal breastfeeding rates were higher than the non‐Aboriginal average breastfeeding rates, but lower than the highest socioeconomic group. Conclusions: The breastfeeding rates of Aboriginal mothers are higher than for other Australians. This is despite the low maternal age and level of education and the high rates of low‐birth‐weight infants and Caesarean section among this population. The World Health Organization recommendation for infant feeding is exclusive breastfeeding until six months, but less than one‐third of Aboriginal mothers achieved this recommendation. 相似文献
10.
Dawn B. Male 《Journal of Applied Research in Intellectual Disabilities》1998,11(2):129-145
This paper reports on the findings of a research study, conducted via a postal questionnaire, which aimed to elicit the wishes, needs and satisfaction with special educational provision of parents of children with severe or profound and multiple learning difficulties. Parents' views regarding services received, type of housing and employment preferred for their child, present and future concerns are also reported. The results indicated that the majority of parents in the sample are generally satisfied with their child's current special school placement and do not want a change of placement. However, one in five parents did indicate a desire for a change of placement, with the preferred option being a special class in an ordinary school. A priority for their child's learning is communication skills. A desire for a high level of involvement in their child's education was indicated but, on the whole, parents did not achieve as high a level as they would wish. Parents were generally satisfied with services received but a significant proportion expressed a desire for additional services. In terms of the future, the majority of parents expect that their child is unlikely to live or work independently or semi-independently as an adult. The paper concludes by discussing ways of enhancing parents' involvement in the decision-making process regarding special provision for their child. 相似文献