全文获取类型
收费全文 | 130423篇 |
免费 | 9834篇 |
国内免费 | 4112篇 |
专业分类
耳鼻咽喉 | 1246篇 |
儿科学 | 7571篇 |
妇产科学 | 3918篇 |
基础医学 | 14482篇 |
口腔科学 | 1601篇 |
临床医学 | 14191篇 |
内科学 | 25048篇 |
皮肤病学 | 2432篇 |
神经病学 | 10690篇 |
特种医学 | 3015篇 |
外国民族医学 | 4篇 |
外科学 | 12450篇 |
综合类 | 17661篇 |
现状与发展 | 16篇 |
预防医学 | 7701篇 |
眼科学 | 2240篇 |
药学 | 6667篇 |
62篇 | |
中国医学 | 11244篇 |
肿瘤学 | 2130篇 |
出版年
2024年 | 383篇 |
2023年 | 2433篇 |
2022年 | 4954篇 |
2021年 | 6423篇 |
2020年 | 5912篇 |
2019年 | 4834篇 |
2018年 | 4721篇 |
2017年 | 4809篇 |
2016年 | 4934篇 |
2015年 | 4682篇 |
2014年 | 9060篇 |
2013年 | 9469篇 |
2012年 | 7211篇 |
2011年 | 8402篇 |
2010年 | 6487篇 |
2009年 | 6313篇 |
2008年 | 6244篇 |
2007年 | 6338篇 |
2006年 | 5686篇 |
2005年 | 4661篇 |
2004年 | 3969篇 |
2003年 | 3524篇 |
2002年 | 2453篇 |
2001年 | 2235篇 |
2000年 | 1925篇 |
1999年 | 1782篇 |
1998年 | 1484篇 |
1997年 | 1378篇 |
1996年 | 1325篇 |
1995年 | 1269篇 |
1994年 | 1092篇 |
1993年 | 988篇 |
1992年 | 877篇 |
1991年 | 680篇 |
1990年 | 617篇 |
1989年 | 527篇 |
1988年 | 521篇 |
1987年 | 470篇 |
1986年 | 409篇 |
1985年 | 517篇 |
1984年 | 436篇 |
1983年 | 270篇 |
1982年 | 358篇 |
1981年 | 315篇 |
1980年 | 255篇 |
1979年 | 211篇 |
1978年 | 135篇 |
1977年 | 108篇 |
1976年 | 93篇 |
1975年 | 41篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Summary Obturator hernias comprise a rare group of abdominal hernias. They are often diagnosed when the small bowel has become obstructed
and the patients are operated on without the causes of the obstruction being known. Although many techniques for closure of
the defect are available, there is no agreement at the present time as to which is the procedure of choice. 相似文献
92.
93.
P. Cortelli P. Parchi E. Sforza M. Contin G. Pierangeli G. Barletta E. Lugaresi 《Clinical autonomic research》1994,4(1-2):57-62
Cardiovascular autonomic function in normotensive awake patients with obstructive sleep apnoea syndrome was studied in 21 normotensive (mean age 48 ± 14 years), drug-free men with obstructive sleep apnoea syndrome. Cardiovascular reflex tests with continuous blood pressure monitoring and biochemical indices were performed the morning after a standard polygraphic sleep recording. A group of 20 agematched (mean age 49 ± 19 years) normal subjects was used as controls. The obstructive sleep apnoea syndrome patients showed higher heart rate and noradrenaline plasma levels (p < 0.05) at rest and a higher blood pressure response to head-up tilt (p < 0.01), suggesting sympathetic overactivity. Respiratory arrhythmia, baroreflex sensitivity index and Valsalva ratio were significantly lower in the obstructive sleep apnoea syndrome group (p < 0.01) whereas the decrease in heart rate induced by the cold face test was significantly higher (p < 0.05) showing a blunting of reflexes dependent on baroreceptor or pulmonary afferents with normal or increased cardiac vagal efferent activity. These abnormalities in autonomic regulation may predispose obstructive sleep apnoea syndrome patients to cardiovascular complications like hypertension and cardiac arrhythmias. 相似文献
94.
AKIHISA MITSUDOME SAWA YASUMOTO SHIU FUKAMI ATSUSHI OGAWA 《Pediatrics international》1997,39(3):392-394
A Japanese boy with Kabuki make-up syndrome associated with West syndrome is reported. He developed periodic tonic spasms at 6 months of age while his electro-encephalogram also revealed hypsarrhythmia. Although only a few previously reported cases of Kabuki make-up syndrome have been associated with epilepsy, it is likely that epileptic seizures are another primary feature of Kabuki make-up syndrome. 相似文献
95.
Masanori Hisaoka Takatoshi Aoki Hiromi Kouho Hirofumi Chosa Hiroshi Hashimoto 《Skeletal radiology》1997,26(3):191-194
The case of a 49-year-old man with Maffucci’s syndrome, who developed multiple spindle cell hemangioendotheliomas, is presented.
The case provides support for recent reports suggesting an association between this peculiar vascular lesion and skeletal
enchondromatosis. 相似文献
96.
97.
Marie-Francoise Dresse Michele David Heather Hume Herve Blanchard Pierre Russo Nicolas Van Doesberg Georges E. Rivard 《Pediatric hematology and oncology》1991,8(4):329-334
The Kasabach-Merritt syndrome is characterized by thrombocytopenia and localized coagulopathy associated with a hemangioma. Most techniques applied to eradicate the tumor or accelerate its involution (surgery, radiation therapy, embolization) are invasive and require transfusion of large amounts of blood products. In some cases, medical treatment is the only alternative. Efficacy of steroids and antifibronolytic agents has already been described, but even this approach is associated with the administration of blood products. We report two cases of infants with Kasabach-Merritt syndrome associated with cardiac and hepatic hemangiomas. At admission, both had signs of cardiac failure. They were successfully treated with prednisone and epsilon-aminocaproic acid (EACA). Blood products were not required once the diagnosis was made. These observations have important implications for the management of patients with Kasabach-Merritt syndrome because they show that even in severe cases blood transfusions can be avoided by the use of prednisone and EACA. 相似文献
98.
Joseph D. obias MD Sandra Lowe MD George W. Holcomb III MD 《Journal of clinical anesthesia》1992,4(6):484-486
The case of a 3-day-old infant with Beckwith-Wiedemann syndrome who required anesthetic care during closure of an abdominal wall defect is presented. Beckwith-Wiedemann syndrome comprises a constellation of clinical features, including macroglossia, macrosomia, omphalocele, visceromegaly, mild microcephaly, facial nevus flammeus, horizontal earlobe creases, and renal medullary dysplasia. Due to the high rate of omphalocele in this syndrome, anesthetic care is frequently required during the neonatal period. Many of these infants (greater than 50%) are born prematurely. Therefore, their anesthetic care may be further complicated by associated diseases of prematurity, such as hyaline membrane disease. Additional anesthetic implications of this syndrome relate to the occurrence and management of hypoglycemia and polycythemia. Careful intraoperative management of glucose homeostasis is particularly important, since eventual neurologic outcome and intelligence will be normal provided prolonged neonatal hypoglycemia is avoided. Preoperative evaluation of the cardiac and genitourinary system, including echocardiography and renal ultrasound, are recommended because of the frequent occurrence of associated anomalies with omphalocele. 相似文献
99.
J. M. Vallat M. J. Leboutet M. O. Jauberteau F. Tabaraud P. Couratier F. Akani 《Muscle & nerve》1994,17(4):378-380
The so-called “widenings of the myelin lamellae” are thought to be specific ultrastructural features of peripheral nerve myelin in patients with peripheral neuropathy associated with a monoclonal dysglobulinemia of IgM type and antiglycolipid activity. We report here a case of Guillain–Barré syndrome with no evidence of serum monoclonal dysglobulinemia, presenting the typical widenings of the myelin lamellae in small-diameter myelinated fibers from a sural nerve biopsy. In view of the positive reaction with anti-C3d complement on direct immunofluorescence, an immunological mechanism may be involved in the widenings of the myelin lamellae. © 1994 John Wiley & Sons, Inc. 相似文献
100.
S. G. Sullivan R. Hussain E. J. Glasson & A. H. Bittles 《Journal of intellectual disability research : JIDR》2007,51(3):228-231
Background Down syndrome is one of the commonest causes of intellectual disability. As life expectancy improves with early and more intensive surgical and medical treatments, people with the disorder are more likely to exhibit classic morbidity and mortality patterns and be diagnosed with diseases such as cancer. Methods A profile of cancer cases among people with Down syndrome has been compiled, based on the analysis of a linked data set that included information from the Disability Services Commission of Western Australian and the State Cancer Registry. Results and conclusions Although the total age‐ and sex‐standardized incidence ratios (SIRs) for people with Down syndrome were similar to that for the general population, SIRs for leukaemia were significantly higher while the incidence of certain other types of cancers was reduced. Overall, there was a lower incidence of solid tumours in Down syndrome, possibly reflecting the age profile of the study cohort. 相似文献