全文获取类型
收费全文 | 10838篇 |
免费 | 553篇 |
国内免费 | 89篇 |
专业分类
耳鼻咽喉 | 93篇 |
儿科学 | 264篇 |
妇产科学 | 457篇 |
基础医学 | 1120篇 |
口腔科学 | 195篇 |
临床医学 | 904篇 |
内科学 | 2843篇 |
皮肤病学 | 92篇 |
神经病学 | 1123篇 |
特种医学 | 579篇 |
外科学 | 1513篇 |
综合类 | 25篇 |
一般理论 | 3篇 |
预防医学 | 463篇 |
眼科学 | 144篇 |
药学 | 643篇 |
中国医学 | 19篇 |
肿瘤学 | 1000篇 |
出版年
2023年 | 69篇 |
2022年 | 171篇 |
2021年 | 299篇 |
2020年 | 168篇 |
2019年 | 256篇 |
2018年 | 329篇 |
2017年 | 244篇 |
2016年 | 271篇 |
2015年 | 314篇 |
2014年 | 418篇 |
2013年 | 534篇 |
2012年 | 801篇 |
2011年 | 788篇 |
2010年 | 416篇 |
2009年 | 437篇 |
2008年 | 640篇 |
2007年 | 602篇 |
2006年 | 628篇 |
2005年 | 633篇 |
2004年 | 568篇 |
2003年 | 550篇 |
2002年 | 483篇 |
2001年 | 159篇 |
2000年 | 144篇 |
1999年 | 140篇 |
1998年 | 110篇 |
1997年 | 115篇 |
1996年 | 90篇 |
1995年 | 70篇 |
1994年 | 75篇 |
1993年 | 45篇 |
1992年 | 108篇 |
1991年 | 85篇 |
1990年 | 90篇 |
1989年 | 63篇 |
1988年 | 70篇 |
1987年 | 59篇 |
1986年 | 58篇 |
1985年 | 44篇 |
1984年 | 42篇 |
1983年 | 33篇 |
1982年 | 31篇 |
1981年 | 30篇 |
1980年 | 26篇 |
1979年 | 17篇 |
1978年 | 14篇 |
1977年 | 16篇 |
1975年 | 15篇 |
1974年 | 17篇 |
1972年 | 17篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Long‐term preclinical magnetic resonance imaging alterations in sporadic Creutzfeldt–Jakob disease 下载免费PDF全文
Gianluigi Zanusso MD Giulia Camporese MD Sergio Ferrari MD Luca Santelli MD Matilde Bongianni PhD Michele Fiorini PhD Salvatore Monaco MD Renzo Manara MD Annachiara Cagnin MD 《Annals of neurology》2016,80(4):629-632
An asymptomatic 74‐year‐old woman, on follow‐up for a carotid body tumor, showed magnetic resonance imaging (MRI) focal restricted diffusion confined to the left temporal and occipital cortices. Thirteen months later, diffusion‐weighted images revealed a bilateral cortical ribbon sign involving all lobes. After 1 month, the patient developed gait instability and cognitive decline rapidly evolving to severe dementia and death within 3 months. Prion protein gene sequence, molecular, and neuropathological studies confirmed the diagnosis of sporadic Creutzfeldt–Jakob disease (sCJD) MM1 subtype. Here we show the kinetics of MRI changes and prion spreading in preclinical sCJD MM1. Ann Neurol 2016;80:629–632 相似文献
112.
113.
Vacante Marco DAgata Velia Motta Massimo Malaguarnera Giulia Biondi Antonio Basile Francesco Malaguarnera Michele Gagliano Caterina Drago Filippo Salamone Salvatore 《BMC surgery》2012,12(1):1-8
Background
Five percent of all patients with breast cancer have distant metastatic disease at initial presentation. Because metastatic breast cancer is considered to be an incurable disease, it is generally treated with a palliative intent. Recent non-randomized studies have demonstrated that (complete) resection of the primary tumor is associated with a significant improvement of the survival of patients with primary metastatic breast cancer. However, other studies have suggested that the claimed survival benefit by surgery may be caused by selection bias. Therefore, a randomized controlled trial will be performed to assess whether breast surgery in patients with primary distant metastatic breast cancer will improve the prognosis.Design
Randomization will take place after the diagnosis of primary distant metastatic breast cancer. Patients will either be randomized to up front surgery of the breast tumor followed by systemic therapy or to systemic therapy, followed by delayed local treatment of the breast tumor if clinically indicated. Patients with primary distant metastatic breast cancer, with no prior treatment of the breast cancer, who are 18 years or older and fit enough to undergo surgery and systemic therapy are eligible. Important exclusion criteria are: prior invasive breast cancer, surgical treatment or radiotherapy of this breast tumor before randomization, irresectable T4 tumor and synchronous bilateral breast cancer. The primary endpoint is 2-year survival. Quality of life and local tumor control are among the secondary endpoints. Based on the results of prior research it was calculated that 258 patients are needed in each treatment arm, assuming a power of 80%. Total accrual time is expected to take 60 months. An interim analysis will be performed to assess any clinically significant safety concerns and to determine whether there is evidence that up front surgery is clinically or statistically inferior to systemic therapy with respect to the primary endpoint.Discussion
The SUBMIT study is a randomized controlled trial that will provide evidence on whether or not surgery of the primary tumor in breast cancer patients with metastatic disease at initial presentation results in an improved survival.Trial registration
NCT01392586. 相似文献114.
Maria Luisa Brandi Giuseppe Guglielmi Salvatore Masala Salvatore Minisola Sergio Ortolani Umberto Tarantino Giovanni Simonetti 《Archives of osteoporosis》2012,7(1-2):21-24
Epidemiology and costs of fragility fractures in Italy
The problem of osteoporosis is emerging as growing phenomenon, with an enormous impact on quality of life and on health expenses. As a consequence, a reduction in the social and health impact of bone fragility would be associated with an improved quality of life of all elderly citizens and with valuable cost savings at the health system level.Osteoporosis: evolution of the concept in Italy
In the last 20?years, there have been enormous advances in the knowledge of diagnostic and therapeutic options and thus we would be in the position of starting effective therapies in at risk populations. However, this not always happens.New approaches to the fragility fractures by the Italian government
In this paper we offer to the reader the possibility to know the history of osteoporosis, its diagnosis and its therapy in Italy, a country where life expectancy is one of the highest in the world.The future of osteoporosis in Italy
We hope that the example of Italy would serve as an inspiration to those countries where the history of osteoporosis only recently began. 相似文献115.
Vincenzo Bottino Maria Grazia Esposito Arianna Mottola Giampaolo Marte Vittorio Di Maio Valerio Sciascia Marco Nunziante Giovanni Fregola Salvatore Cuzzovaglia Francesco Galante Federica Andreoli Alfredo Breglia Maria Elena Giuliano Domenico Papaleo Paola Della Rocca Pietro Maida 《BMC surgery》2012,12(Z1):S8
Background
The aim of this study was to define any benefits in terms of early outcome for laparoscopic colectomy in patients over 75 years old (OP) compared with the outcomes of a younger populations (YP).Methods
Forty elderly patients undergoing laparoscopic colectomy for colorectal cancer between 2007-2011 were studied, the patients are divided for gender, age, year of surgery, site of cancer, and comorbidity on admission and compared with 40 younger patients.Results and discussion
Mean (standard deviation) age was 81.3 in OP and 68.3 YP Conversion rate was the same between the two groups. There was no difference in operative mean time . The overall mortality rate was 0% percent. The surgical morbidity rate was the same but there was an increased in cardiologic e bronchopneumonia complications in older population. Patients treated with laparoscopic approach had a faster recovery of bowel function and a significant reduction of the mean length of hospital stay not age related. Laparoscopy allowed a better preservation of postoperative independence status.Conclusions
Laparoscopic colectomy for cancer in elderly patients is safe and beneficial including preservation of postoperative independence and a reduction of length of hospital stay.116.
117.
Late antinociception and lower untoward effects of concomitant intrathecal morphine and intravenous buprenorphine in humans 总被引:2,自引:0,他引:2
Beltrutti D Niv D Ben-Abraham R Di Santo S Weinbroum AA 《Journal of clinical anesthesia》2002,14(6):441-446
STUDY OBJECTIVE: To evaluate the perioperative antinociceptive effect of intrathecal morphine (a pure mu agonist), intravenous (IV) buprenorphine (a partial mu agonist) or their combination. DESIGN: Randomized, double-blind, placebo-controlled study. SETTINGS: Anesthesiology department of a university-affiliated public hospital. PATIENTS: 45 ASA physical status I, II, and III patients undergoing hysterectomy with general anesthesia. INTERVENTIONS: Preoperative and postoperative regimens consisted of intrathecal morphine 4.3 microg.kg(-1) plus IV 0.9% saline (Group 1), IV buprenorphine 1.3 microg.kg(-1) plus intrathecal saline (Group 2), and intrathecal morphine 4.3 microg.kg(-1) plus IV buprenorphine 1.3 microg.kg(-1) (Group 3; postoperative supplements consisting of IV buprenorphine 1.3 microg.kg(-1) plus intrathecal saline). MEASUREMENTS AND MAIN RESULTS: Group 2 and 3 patients were given three analgesic dosings compared with two dosings in Group 1 (p < 0.001). The duration of action in Group 2 was significantly shorter (p = 0.001) than in the other two groups. The 12-hour postoperative pain intensity and sedation in Group 3 was significantly lower (p < 0.05) than in the other groups. Side effects (mainly pruritus and nausea and vomiting) were significantly fewer (p < 0.05) in Groups 2 and 3 (26% and 28%, respectively) than in Group 1 (46%). CONCLUSIONS: The concomitant administration of intrathecal morphine and IV buprenorphine alleviates pain sensation and minimizes sedation more effectively than when given after the administration of either drug separately. In addition, IV buprenorphine affords a reduction in side effects. 相似文献
118.
White KE Bilous RW Marshall SM El Nahas M Remuzzi G Piras G De Cosmo S Viberti G 《Diabetes》2002,51(10):3083-3089
We estimated glomerular cell number in 50 normotensive type 1 diabetic patients with raised albumin excretion rate (AER) and investigated any change after 3 years in a subgroup of 16 placebo-treated patients. Biopsies from 10 normal kidney donors were used as controls. Mesangial and endothelial cell number was increased in the 50 diabetic patients at the start of the study compared with control subjects. There was no difference in podocyte number. Glomerular volume was increased in diabetic patients, but surface area of glomerular basement membrane (GBM) underlying the podocytes did not differ between groups. AER correlated positively with mesangial cell number in microalbuminuric patients (r = 0.44, P = 0.012) and negatively with podocyte number in proteinuric patients (r = -0.48, P = 0.040). In the 16 placebo-treated patients, glomerular volume increased after 3 years owing to matrix accumulation and increased GBM surface area. Although overall cell number did not differ significantly from baseline, the decrease in podocyte number during follow-up correlated with AER at follow-up (r = -0.72, P = 0.002). In conclusion, cross-sectional analysis of podocyte number in type 1 diabetic patients with raised AER but normal blood pressure shows no significant reduction compared with nondiabetic control subjects. Longitudinal data provide evidence for an association between podocyte loss and AER, but whether cellular changes are a response to, a cause of, or concomitant with the progression of nephropathy remains uncertain. 相似文献
119.
Spontaneous hepatic hydatid cyst rupture into the biliary tract is unusual. The authors describe a case of a 62-year-old man with a hepatic hydatid cyst, showing that it is possible to confirm rupture into the biliary system with cholangiography-MRI. Surgical treatment remains the best form of management. Endoscopic management is a therapeutic possibility in all cases in which surgery is contraindicated. In the case observed endoscopic sphinctererotomy resolved the biliary obstruction, while the hydatid cyst was treated by transbiliary irrigation with scolicidal solutions and pharmacological therapy. The treatment permitted complete clinical resolution of the hepatic hydatosis. 相似文献
120.
Twenty-five percent of patients undergoing surgery for acute complicated diverticulitis represent emergencies. This condition is currently treated by colonic resection with primary anastomosis with or without colostomy, or by a Hartmann operation. We report on our experience with 52 consecutive patients with generalized peritonitis (8 cases), peri- and paracolonic abscesses (19 cases), severe pelvic abscesses (12 cases) and multiple abscesses with visceral fistulas (13 cases). All patients had emergency surgery. In 50/52 patients (96.2%) we performed a colonic resection with primary anastomosis using a mechanical stapler and in 2/52 a Hartmann operation. The overall mortality rate was 5.8%. The morbidity rate was 22% with 9 anastomotic leakages. A diverting colostomy was constructed in 16 patients and opened in only 8 patients. In 4 cases a parastomal hernia occurred after late closure and reduction of the colostomy. This data suggest that colonic resection with primary anastomosis, even without colostomy, is a safe procedure for the emergency treatment of acute complicated diverticulitis. 相似文献