全文获取类型
收费全文 | 1118853篇 |
免费 | 76045篇 |
国内免费 | 2893篇 |
专业分类
耳鼻咽喉 | 14574篇 |
儿科学 | 37433篇 |
妇产科学 | 30431篇 |
基础医学 | 159911篇 |
口腔科学 | 30001篇 |
临床医学 | 101751篇 |
内科学 | 217593篇 |
皮肤病学 | 24614篇 |
神经病学 | 90251篇 |
特种医学 | 42015篇 |
外国民族医学 | 309篇 |
外科学 | 165849篇 |
综合类 | 25559篇 |
现状与发展 | 1篇 |
一般理论 | 541篇 |
预防医学 | 88245篇 |
眼科学 | 25506篇 |
药学 | 80010篇 |
28篇 | |
中国医学 | 2183篇 |
肿瘤学 | 60986篇 |
出版年
2021年 | 8886篇 |
2019年 | 9416篇 |
2018年 | 12639篇 |
2017年 | 9861篇 |
2016年 | 11163篇 |
2015年 | 12731篇 |
2014年 | 17512篇 |
2013年 | 26804篇 |
2012年 | 35911篇 |
2011年 | 38314篇 |
2010年 | 22721篇 |
2009年 | 21513篇 |
2008年 | 36002篇 |
2007年 | 38131篇 |
2006年 | 38471篇 |
2005年 | 37351篇 |
2004年 | 36240篇 |
2003年 | 35011篇 |
2002年 | 33582篇 |
2001年 | 48026篇 |
2000年 | 48893篇 |
1999年 | 41407篇 |
1998年 | 12698篇 |
1997年 | 11400篇 |
1996年 | 11226篇 |
1995年 | 10838篇 |
1994年 | 9961篇 |
1993年 | 9359篇 |
1992年 | 32942篇 |
1991年 | 32101篇 |
1990年 | 31619篇 |
1989年 | 30469篇 |
1988年 | 27701篇 |
1987年 | 27820篇 |
1986年 | 25949篇 |
1985年 | 25229篇 |
1984年 | 19175篇 |
1983年 | 16278篇 |
1982年 | 10353篇 |
1981年 | 9340篇 |
1979年 | 17301篇 |
1978年 | 12757篇 |
1977年 | 10820篇 |
1976年 | 10169篇 |
1975年 | 10551篇 |
1974年 | 12656篇 |
1973年 | 12126篇 |
1972年 | 11099篇 |
1971年 | 10242篇 |
1970年 | 9500篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
Andrew J. Admon Viren Kaul Sushma K. Cribbs Elizabeth Guzman Odalys Jimenez Jeremy B. Richards 《Medical teacher》2020,42(5):500-506
AbstractLive discussions on the social media site Twitter or Twitter chats are gaining popularity as powerful tools for engaging a broad audience in an interactive discussion. Medical education, in particular, is experiencing an increase in the use of this modality to support informal learning, as a means to encourage collaboration and share best practices, and as a platform for large-scale mentorship. Despite this growth in popularity, there are limited data to guide medical educators on the fundamentals of organizing a Twitter chat. In this Twelve Tips article, we discuss strategies relevant to potential Twitter chat organizers. We have arranged the tips chronologically, beginning with a discussion of initial considerations when planning and formulating a chat topic and publicizing the chat to potentially interested people and groups, followed by practical considerations while hosting the chat, and finally strategies for evaluating and extending a Twitter chat’s impact. 相似文献
22.
23.
Hao Cui Hartzell V. Schaff Joseph A. Dearani Brian D. Lahr Jason K. Viehman Jeffrey B. Geske Rick A. Nishimura Steve R. Ommen 《The Journal of thoracic and cardiovascular surgery》2021,161(3):997-1006.e3
ObjectiveTo evaluate the outcomes after septal myectomy in patients with obstructive hypertrophic cardiomyopathy according to atrial fibrillation and surgical ablation of atrial fibrillation.MethodsWe reviewed patients with obstructive hypertrophic cardiomyopathy who underwent septal myectomy at the Mayo Clinic from 2001 to 2016. History of atrial fibrillation was obtained from patient histories and electrocardiograms. All-cause mortality was the primary end point.ResultsA total of 2023 patients underwent septal myectomy, of whom 394 (19.5%) had at least 1 episode of atrial fibrillation preoperatively. Among patients with atrial fibrillation, 76 (19.3%) had only 1 known episode, 278 (70.6%) had recurrent paroxysmal atrial fibrillation, and 40 (10.2%) had persistent atrial fibrillation. Surgical ablation was performed in 190 patients at the time of septal myectomy, including 148 with pulmonary vein isolation and 42 with the classic maze procedure. Among all patients, operative mortality was 0.4%, and there were no early deaths in patients undergoing surgical ablation. Over a median follow-up of 5.6 years, patients with preoperative atrial fibrillation had increased mortality (hazard ratio, 1.36; 95% confidence interval, 0.97-1.91; P = .070) after multivariable adjustment for comorbidities. When considering the impact of atrial fibrillation with or without surgical treatment, the adjusted hazard ratio for mortality in patients undergoing ablation compared with no ablation was 0.93 (95% confidence interval, 0.52-1.69; P = .824).ConclusionsAtrial fibrillation is present preoperatively in one-fifth of patients with obstructive hypertrophic cardiomyopathy undergoing myectomy and showed a trend toward higher all-cause mortality. Survival of patients undergoing septal myectomy with preoperative atrial fibrillation was similar between those who did and did not receive concomitant surgical ablation. 相似文献
24.
25.
26.
27.
Neeraj Sood Victoria L. Shier Haley Nakata Richard Iorio Jay R. Lieberman 《The Journal of arthroplasty》2019,34(4):609-612.e1
Background
Comprehensive Care for Joint Replacement (CJR) is a Medicare initiative to test the impact of holding a hospital accountable for services provided during an episode of care for a lower extremity joint arthroplasty on costs and quality. This study examines whether hospital participation in CJR is associated with having programs focused on improving posthospitalization care or reducing costs using a survey of orthopedic surgeons.Methods
Seventy-three (of 104) orthopedic surgeon members of the Hip Society, a national professional organization of hip surgeons, completed the survey.Results
Surgeons practicing in CJR hospitals were more likely to report that their hospital had implemented programs focused on improving posthospitalization care or reducing costs. Surgeons in CJR hospitals were significantly more likely to report that the hospital had a narrow network of skilled nursing facilities to enhance care and limit length of stay in skilled nursing facilities (83% vs 47%, P < .01). Surgeons in CJR hospitals were also more likely to report the hospital provides incentives or some type of gainsharing. There were no statistically significant differences in implementation of having programs to reduce costs or improve care during hospitalization.Conclusion
Participation in CJR is associated with higher utilization of hospital practices aimed at improving postdischarge care and higher utilization of linking surgeon compensation to cost and quality. 相似文献28.
Chahine C. Assi Hanane B. Barakat Jacques H. Caton Elie N. Najjar Camille T. Samaha Kaissar F. Yammine 《The Journal of arthroplasty》2019,34(2):333-337
Background
The dual mobility cups (DMCs) were shown to reduce dislocation rate following total hip arthroplasty for any etiology, including femoral neck fractures. No reported studies evaluating DMC results for femoral neck fracture in a Middle Eastern population were found in the literature.Methods
This study aims to look for mortality rate, clinical, and functional outcomes in a population having specific rituals involving extreme hip positions as part of their daily activities.Results
Of an initial sample of 174 patients (177 operated hips), 18 (10.3%) patients (20 hips) died after a mean of 39.6 ± 13.8 months (ranging from 2 to 49 months) with only 3 (1.7%) during the first post-operative year. Twelve patients (13 hips) were lost to follow-up and 19 patients (19 hips) had their radiological data incomplete. In the final sample of 125 patients (125 hips), no dislocation, aseptic loosening, or infection was encountered. The mean modified Hip Harris Score was of 94.8 ± 8.4. The mean modified Hip Harris Score of 40 patients who used to practice regularly oriental sitting position or prayers was 94.1 ± 3.1. After surgery, 36 of these 40 patients (90%) described their hip as “a forgotten hip.” Multivariate analyses found correlation only between mortality and cardiovascular co-morbidities.Conclusion
DMC implants showed excellent clinical and functional results. The majority of patients having rituals and customs involving extreme hip positions were able to resume their daily activities. The observed low mortality rate should incite future research to investigate its correlation with the use of DMCs. 相似文献29.
Peter B. White Mrinal Sharma Ahmed Siddiqi James R. Satalich Amar S. Ranawat Chitranjan S. Ranawat 《The Journal of arthroplasty》2019,34(5):887-892
Background
Anterior knee pain (AKP) remains a complex issue affecting patient satisfaction after total knee arthroplasty. Several radiographic parameters have been shown to be causative factors with various designs. The aim of this study is to evaluate the known radiographic parameters of AKP and clinical outcomes (ie, AKP) in the setting of a modern prosthesis with an anatomic patella button.Methods
Between July 2012 and December 2013, 90 total knee arthroplasties received 3 skyline views taken at 30°, 45°, and 60°. A patient-administered questionnaire was administered at 2-year follow-up to assess the incidence of AKP, painless noise, and satisfaction. Radiographs were analyzed for patellofemoral overstuffing, patellar tilt, and patellar displacement, and evaluated the patella resection angle.Results
On the patient-administered questionnaire, 10 (11.1%) patients reported AKP of a mild-to-moderate nature. Thirty-one had the best view at 30 Merchant views, 24 had best views at 45, and 35 had best views at 60. We found that patellar resection angle correlated with AKP (odds ratio 1.21, P = .044) and painless noise (odds ratio 1.22, P = .034). Patellar displacement and patellofemoral stuffing did not correlate with AKP or painless noise. No radiographic measurements correlated with changes in Knee Society Score pain or function scores or range of motion.Conclusion
We found that a patellar resection angle correlated with the incidence of AKP and painless noise at 2-year follow-up. We failed to find any correlation with patellofemoral overstuffing, patellar displacement, or patellar tilt with clinical outcomes. We recommend the use of 3 Merchant views to fully evaluate the patellofemoral joint. 相似文献30.
J. Rodríguez-Carrio A. Martínez-Zapico I. Cabezas-Rodríguez L. Benavente Á.I. Pérez-Álvarez P. López J.B. Cannata-Andía M. Naves-Díaz A. Suárez 《Nutrition, metabolism, and cardiovascular diseases : NMCD》2019,29(2):135-143