首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   180538篇
  免费   1387篇
  国内免费   18篇
耳鼻咽喉   1245篇
儿科学   6958篇
妇产科学   3148篇
基础医学   17320篇
口腔科学   1570篇
临床医学   12715篇
内科学   31884篇
皮肤病学   844篇
神经病学   16602篇
特种医学   8960篇
外科学   29255篇
综合类   2607篇
一般理论   1篇
预防医学   18454篇
眼科学   2887篇
药学   9961篇
中国医学   659篇
肿瘤学   16873篇
  2022年   98篇
  2021年   176篇
  2020年   104篇
  2019年   128篇
  2018年   22027篇
  2017年   17444篇
  2016年   19631篇
  2015年   1056篇
  2014年   988篇
  2013年   996篇
  2012年   7278篇
  2011年   21301篇
  2010年   18993篇
  2009年   11672篇
  2008年   19730篇
  2007年   21896篇
  2006年   716篇
  2005年   2335篇
  2004年   3516篇
  2003年   4480篇
  2002年   2607篇
  2001年   439篇
  2000年   568篇
  1999年   278篇
  1998年   247篇
  1997年   243篇
  1996年   131篇
  1995年   142篇
  1994年   141篇
  1993年   102篇
  1992年   137篇
  1991年   174篇
  1990年   211篇
  1989年   143篇
  1988年   127篇
  1987年   112篇
  1986年   86篇
  1985年   96篇
  1984年   58篇
  1983年   63篇
  1980年   66篇
  1979年   56篇
  1978年   49篇
  1974年   64篇
  1972年   52篇
  1970年   56篇
  1969年   49篇
  1938年   61篇
  1932年   57篇
  1930年   52篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
A woman with a medical history of breast cancer presented with chronic pain of the right hemithorax. To alleviate pain, a continuous paravertebral block was performed using a pigtail end catheter, introduced using ultrasound visualization (transversal technique at the inferior articular process of T6). Complete pain relief was observed. A few hours later, urinary retention was diagnosed and discharge from the ambulatory setting was canceled. On the following day, a new injection of local anesthetics through the catheter triggered paresthesia in the contralateral leg and a new urinary retention was diagnosed. A CT scan confirmed the epidural misplacement of the catheter. The latter was withdrawn, and the patient was released to home after the complete disappearance of her neurological symptoms. This case report highlights the risk of inadvertently misplacing the catheter into the epidural space during thoracic paravertebral block, even with a “pigtail” distal end type of catheter.  相似文献   
992.
993.
Single-incision approach in robotic gynecology is a relatively new concept. The role of single-port systems in robotic hysterectomy, their advantages and disadvantages, as well as the technical challenges, are still under investigation. A systematic review was performed by searching in PubMed and Scopus databases. In 810 out of 1225 patients, hysterectomy was performed for non-neoplastic disease. Single-Site® was the most common port system. Duration of the procedure and relative blood loss ranged from 60 to 311 min and 7 to 750 ml, respectively. The weight of the removed uteri ranged from 39 to 520 g. 4.9% of the included patients presented complications, among which bleeding, vaginal haematoma, laceration and dehiscence, umbilical hernia, and visceral injuries. Conversion rate to laparotomy reached 2.8%. Although some technical difficulties are still described in the literature, the single-port approach is becoming more standardized nowadays and performed by more surgeons. The initial phase of the learning curve can be achieved after five cases, while a proficiency in intracorporeal cuff suturing after 14 cases. Uterus weight and previous abdominal surgical history can still be limitations of the technique. Compared to our previous study, we can see that the technique has been used in more elderly or obese patients. The complication rate can reach 4.9% while the conversion rate can reach 2.8%. However, we consider that complication and conversion rates as well as surgical time could be improved with experience. Regarding post-operative pain and cosmetic outcomes, the lack of information do not allow us to draw any safe conclusions.  相似文献   
994.
995.
Hemoglobinopathies are a group of inherited single gene disorders. There are reports on hemoglobin (Hb) variants identified in the tribal and non-tribal populations of Tripura State in northeastern India. This study aimed to determine the spectrum of hemoglobinopathies and enzymopathies by newborn screening in Tripura State and assess the extent of neonatal jaundice. A total of 2400?cord blood samples were collected and analyzed by high performance liquid chromatography (HPLC). Further confirmation of any abnormal HPLC was done by DNA analysis. The samples were also screened for deficiency of enzymopathies, glucose-6-phosphate dehydrogenase (G6PD) deficiency and pyruvate kinase. Of 2400?cord blood samples screened, 225 (9.3%) were Hb E (HBB: c.79G>A) heterozygotes, 80 (3.3%) were Hb E homozygotes and one carried Hb E-β-thalassemia (β-thal). Other Hb abnormalities were also detected including 15 Hb S (HBB: c.20A>T) heterozygotes, two Hb D-Punjab (HBB: c.364G>C) heterozygotes and two compound heterozygotes for Hb D-Punjab and Hb E. Of the 80 homozygous Hb E babies, four were non-tribal and 76 babies were tribal, and 225 patients carried Hb E trait, 141 were tribal, while 84 were non-tribal. Of 40 G6PD deficient babies identified, 13 had coinherited Hb E and two babies had pyruvate kinase deficiency. α Genotyping was performed in 162 affected babies, 50 of them carried α gene deletions. Newborn screening programs for Hb E, other hemoglobinopathies and G6PD deficiency must be encouraged in the malaria-endemic northeastern region of India. Drug-induced hemolysis can also be avoided by screening for G6PD deficiency at birth.  相似文献   
996.
This article discusses the role of complementary and alternative medicine (CAM) in the management of fibroids and associated symptomatology. Since there is such a paucity of direct research related to fibroids, conditions that are implicated in the causation of uterine fibroids and symptomatology that CAM treatments may or have been shown to make a difference are also considered.  相似文献   
997.
We present a case of sarcoma occurring at a site of resected oligodendroglioma without preceding radiotherapy or chemotherapy. Oligosarcoma occurring at sites of resected oligodendroglioma or anaplastic oligodendroglioma with sarcomatous components are rare. Although meningioma or sarcoma-like lesions are sometimes reported after glioma-targeted radiotherapy, those without preceding radiotherapy are quite rare. Moreover, cases of sarcoma without oligodendroglial components occurring at a site of resected oligodendroglioma have never been reported. In this case, fluorescent in situ hybridization analysis revealed 1p/19q co-deletion in both the first tumor and second tumors. Additionally, immunohistochemistry revealed mutated isocitrate dehydrogenase 1 in both tumors. Taken together, these findings suggest a monoclonal tumor origin. Consequently, this case may indicate a new mechanism of development of sarcomatous lesions occurring at the site of a resected glioma.  相似文献   
998.
999.
Comorbidities among US patients with ankylosing spondylitis (AS) are inadequately understood. This study compared the prevalence and incidence of comorbidities between patients with AS and matched controls using national claims databases. Adults enrolled in the MarketScan Commercial and Medicare databases with ≥?1 inpatient or ≥?2 non-rule-out outpatient diagnoses of AS between January 1, 2012 and December 31, 2014 were included. Patients had to have ≥?1 AS diagnosis in 2013; the first AS diagnosis in 2013 was assigned as the index date. Control patients without AS were matched to AS patients on age, geographic region, index calendar year, and sex. Comorbidities were evaluated in AS patients and matched controls during the baseline and follow-up periods (before and after the index date, respectively). Hazard ratios of developing new comorbidities were estimated using Cox proportional hazard models adjusted for patients’ characteristics. A total of 6679 patients with AS were matched to 19,951 control patients. In addition to extra-articular manifestations of AS (inflammatory bowel disease [IBD], psoriasis, uveitis), a higher proportion of AS patients had asthma, cardiovascular disease, depression, dyslipidemia, gastrointestinal ulcers, malignancies, multiple sclerosis, osteoporosis, sleep apnea, and spinal fractures during the baseline period than matched controls. After AS diagnosis, a higher proportion of patients developed newly diagnosed cases of cardiovascular diseases, depression, osteoporosis, spinal fracture, IBD, psoriasis, and uveitis than matched controls. In this real-world, US claims-based study, patients with AS were shown to have significantly more comorbidities than matched controls.  相似文献   
1000.
Simone Marnitz 《Der Onkologe》2016,22(10):773-779
Chemoradiotherapy is an integral component of cervical cancer treatment in cases where surgery alone is not sufficient to achieve an optimal oncological outcome. The present German interdisciplinary guidelines on treatment of cervical cancer recommend performing either radical hysterectomy or primary chemoradiotherapy. The frequently used practice of trimodal therapy (i.e. radical hysterectomy, radiation and chemotherapy) doubles the risk for treatment-related delayed toxicity and should be avoided whenever possible. If risk factors are known prior to therapy, e.?g. lymph node metastases, parametrial infiltration or a combination of tumor size >4 cm, grade 3, lymphovascular space invasion (LVSI) or deep stromal infiltration, primary chemoradiotherapy should be recommended. The purely clinical FIGO classification does not consider lymph node involvement. This leads to a high rate of adjuvant chemoradiotherapy after radical surgery due to lymph node involvement. This could have been avoided in 90?% of patients, if surgical (laparoscopic) lymph node staging would have been used routinely. Whether this can result in advantages for patients with respect to the prognosis, was one of the aims of the Uterus-11 study of the working group for gynecological oncology (AGO) and the working group on radiological oncology (ARO).Mature data are expected to be available in 2018. For chemoradiotherapy sophisticated irradiation techniques should be used, which are available in all German treatment facilities. This is the only way to reduce acute and delayed side effects. Although ovarian preservation by ovarian transposition and organ sparing can be provided to premenopausal patients, a pregnancy after full-dose chemoradiotherapy is unlikely because of the resulting atrophy of the endometrium and fibrosis of the myometrium. Oncological results depend on treatment quality, full-dose external beam radiation, the use of brachytherapy and the administration of concomittant chemotherapy. The experience of the treatment facility is a predictor for patient outcome. The value of neoadjuvant chemotherapy in locally advanced cervical cancer is unclear and still under discussion.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号