全文获取类型
收费全文 | 274612篇 |
免费 | 19988篇 |
国内免费 | 10360篇 |
专业分类
耳鼻咽喉 | 3120篇 |
儿科学 | 4075篇 |
妇产科学 | 3100篇 |
基础医学 | 33507篇 |
口腔科学 | 6176篇 |
临床医学 | 30655篇 |
内科学 | 39897篇 |
皮肤病学 | 5894篇 |
神经病学 | 16082篇 |
特种医学 | 13179篇 |
外国民族医学 | 46篇 |
外科学 | 31140篇 |
综合类 | 33337篇 |
现状与发展 | 39篇 |
一般理论 | 38篇 |
预防医学 | 20592篇 |
眼科学 | 6334篇 |
药学 | 27302篇 |
134篇 | |
中国医学 | 10981篇 |
肿瘤学 | 19332篇 |
出版年
2024年 | 488篇 |
2023年 | 2426篇 |
2022年 | 6504篇 |
2021年 | 9684篇 |
2020年 | 6534篇 |
2019年 | 6288篇 |
2018年 | 7234篇 |
2017年 | 6874篇 |
2016年 | 7454篇 |
2015年 | 11329篇 |
2014年 | 14324篇 |
2013年 | 16103篇 |
2012年 | 23585篇 |
2011年 | 24124篇 |
2010年 | 16931篇 |
2009年 | 14784篇 |
2008年 | 17990篇 |
2007年 | 17227篇 |
2006年 | 16026篇 |
2005年 | 14293篇 |
2004年 | 11521篇 |
2003年 | 10708篇 |
2002年 | 8760篇 |
2001年 | 6824篇 |
2000年 | 5776篇 |
1999年 | 4195篇 |
1998年 | 2033篇 |
1997年 | 1852篇 |
1996年 | 1291篇 |
1995年 | 1125篇 |
1994年 | 989篇 |
1993年 | 712篇 |
1992年 | 1144篇 |
1991年 | 1027篇 |
1990年 | 922篇 |
1989年 | 783篇 |
1988年 | 654篇 |
1987年 | 635篇 |
1986年 | 461篇 |
1985年 | 487篇 |
1984年 | 333篇 |
1983年 | 245篇 |
1982年 | 171篇 |
1981年 | 197篇 |
1980年 | 148篇 |
1979年 | 255篇 |
1978年 | 196篇 |
1976年 | 152篇 |
1974年 | 153篇 |
1973年 | 149篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Hyo-Kon Kim Sung-Han Ha Gi-Jun Lee Sun-O Yu Jung-Rae Kim 《Clinics in Orthopedic Surgery》2015,7(3):414-417
Synovial chondromatosis is a rare lesion in the wrist, but some cases in the distal radioulnar joint have been reported and previous case reports emphasize joint calcifications, shown on preoperative plain radiographs. We report an extremely uncommon case of synovial chondromatosis in the pisotriquetral joint, in which radiographs and magnetic resonance imaging did not demonstrate apparent calcified bodies. In our case, for the accurate diagnosis and treatment, surgical exploration of the joint and synovectomy with removal of loose bodies was performed. 相似文献
3.
4.
目的:探讨胸膝卧位矫正枕位异常的可行性。方法:将单胎初产临产的枕位异常的产妇186例,随机分成两组,入选者均无绝对头盆不称、胎儿窘迫、严重妊娠并发症及合并症,其中96例为观察组采取胸膝卧位矫正枕位,另90例为对照组按常规处理。结果:观察组产程明显缩短,阴道分娩率明显增加,而胎儿窘迫及新生儿窒息率明显降低,两组比较有统计学意义。结论:胸膝卧位在产程中矫正枕位异常是一种切实可行的方法 相似文献
5.
Comparative outcomes of vascular access in patients older than 70 years with end-stage renal disease
Deokbi Hwang Sujin Park Hyung-Kee Kim Seung Huh 《Journal of vascular surgery》2019,69(4):1196-1206.e5
Objective
The advantage of arteriovenous fistulas (AVFs) in older patients requiring dialysis is controversial. We reviewed our vascular access experience in patients ≥70 years of age (older group) compared with younger patients.Methods
We analyzed consecutive patients who underwent access surgery between 2013 and 2016. Primary success (PS) and primary patency (PP) data were analyzed between the older and younger groups before and after propensity score matching of the patients' characteristics and access composition. PS was defined as the achievement of access function that was amenable to two sessions of successful cannulation without early occlusion or maturation failure requiring revision. PP was defined as the time with uninterrupted patency without intervention.Results
A total of 594 consecutive accesses were created among 563 patients, of whom 119 were allocated into each group after propensity score matching. In the whole cohort, 193 accesses (32.5%) were performed in older patients. AVFs were performed in 130 (67.4%) older patients and 293 (73.1%) younger patients. Regarding AVFs, the PS rate (83.6% in the older group vs 94.3% in the younger group; P = .001) and the overall PP at 6 and 12 months (73.1% and 57.1%, respectively, in the older group vs 86.7% and 77.7%, respectively, in the younger group; P = .009) were lower in the older group than in the younger group. However, no differences were found in the PS and PP rates for arteriovenous grafts between groups. Regarding the AVF location, the PS rate for forearm AVFs was significantly lower in the older group than in the younger group (76% vs 93%; P < .001); however, the PS rate of the upper arm was not different between the groups (94% vs 97%; P = .425). In the patients with PS, the PP rate of AVFs was similar between the two groups. In the older group with forearm AVFs, the median diameter of the radial artery was larger in the patients with PS than in the patients without PS (2.20 mm with PS vs 2.00 mm without PS; P = .008). The propensity score matching results demonstrated similar trends for the whole cohort, with lower PS (P = .042) and PP rates (P = .023) for AVF in the older group.Conclusions
The outcomes after AVF were poorer in the older group than in the younger group, which was primarily due to unsatisfactory outcomes in patients with forearm AVFs. Thus, stricter criteria, especially regarding the radial artery diameter, should be applied for forearm AVFs in older patients, and additional research is necessary to delineate the risk factors for primary failure. 相似文献6.
7.
2013年5月至2014年2月对解放军107医院收治的80例腺样体肥大患者采用吸痰管牵拉软腭暴露鼻咽部,并在70°鼻内镜辅助下行肥大腺样体切除术,效果良好,现报告如下。1资料与方法1.1临床资料本组80例中,男43例,女37例,5~13岁,平均7岁,病程9个月~4年。临床症状均有不同程度夜寐打鼾、张口呼吸,伴有鼻塞。其中 相似文献
8.
The cingulum, connecting the orbitofrontal cortex to the medial temporal lobe, involves in diverse cognition functions including attention, memory, and motivation. To investigate the relationship between the cingulum injury and cognitive impairment in patients with chronic mild traumatic brain injury, we evaluated the integrity between the anterior cingulum and the basal forebrain using diffusion tensor tractography in 73 patients with chronic mild traumatic brain injury(39 males, 34 females, age 43.29 ± 11.42 years) and40 healthy controls(22 males, 18 females, age 40.11 ± 16.81 years). The patients were divided into three subgroups based on the integrity between the anterior cingulum and the basal forebrain on diffusion tensor tractography: subgroup A(n = 19 patients)-both sides of the anterior cingulum were intact; subgroup B(n= 36 patients)-either side of the anterior cingulum was intact; and subgroup C(18 patients)-both sides of the anterior cingulum were discontinued. There were significant differences in total Memory Assessment Scale score between subgroups A and B and between subgroups A and C. There were no significant differences in diffusion tensor tractography parameters(fractional anisotropy, apparent diffusion coefficient, and fiber volume) between patients and controls. These findings suggest that the integrity between the anterior cingulum and the basal forebrain, but not diffusion tensor tractography parameter, can be used to predict the cognitive function of patients with chronic mild traumatic brain injury. This study was approved by Yeungnam University Hospital Institutional Review Board(approval No. YUMC-2014-01-425-010) on August 16, 2017. 相似文献
9.
10.
This study utilizes a psychophysical approach to examine the effects on
carrying capacity for bi-manual carrying tasks involving different handle positions and
carrying ranges. A total of 16 female subjects participated in the experiment in groups of
two people, and each group of subjects performed the tasks in a random order with 12
different combinations of carrying task. The independent variables are handle position
(upper, middle, lower) and carrying range (F–F: floor height carried to floor height, F–W:
floor height carried to waist height, W–W: waist height carried to waist height, W–F:
waist height carried to floor height), the dependent variable is the maximum acceptable
carried weight (MAWC), heart rate (HR), and the rating of perceived exertion (RPE). The
results show that the handle position has a significant effect on MAWC and overall RPE but
no significant effect on HR. Carrying range has a significant effect on the MAWC and HR,
but no significant effect on overall HR. The handle position and carrying range have a
significant interaction on the MAWC and HR. The RPE for different body parts shows
significant differences, and the hands feel the most tired. Overall, this study confirms
that the lower handle position with the W–W carrying range is the best combination for a
two-person carrying task. 相似文献