全文获取类型
收费全文 | 1304篇 |
免费 | 87篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 120篇 |
妇产科学 | 14篇 |
基础医学 | 118篇 |
口腔科学 | 30篇 |
临床医学 | 121篇 |
内科学 | 289篇 |
皮肤病学 | 25篇 |
神经病学 | 49篇 |
特种医学 | 266篇 |
外科学 | 115篇 |
综合类 | 27篇 |
预防医学 | 99篇 |
眼科学 | 5篇 |
药学 | 64篇 |
中国医学 | 2篇 |
肿瘤学 | 51篇 |
出版年
2023年 | 7篇 |
2021年 | 8篇 |
2020年 | 8篇 |
2019年 | 11篇 |
2018年 | 27篇 |
2017年 | 15篇 |
2016年 | 19篇 |
2015年 | 20篇 |
2014年 | 21篇 |
2013年 | 37篇 |
2012年 | 31篇 |
2011年 | 30篇 |
2010年 | 50篇 |
2009年 | 51篇 |
2008年 | 36篇 |
2007年 | 32篇 |
2006年 | 30篇 |
2005年 | 23篇 |
2004年 | 19篇 |
2003年 | 18篇 |
2002年 | 13篇 |
2001年 | 33篇 |
2000年 | 21篇 |
1999年 | 28篇 |
1998年 | 54篇 |
1997年 | 66篇 |
1996年 | 54篇 |
1995年 | 48篇 |
1994年 | 53篇 |
1993年 | 56篇 |
1992年 | 22篇 |
1991年 | 20篇 |
1990年 | 20篇 |
1989年 | 48篇 |
1988年 | 43篇 |
1987年 | 37篇 |
1986年 | 45篇 |
1985年 | 36篇 |
1984年 | 15篇 |
1983年 | 28篇 |
1982年 | 22篇 |
1981年 | 22篇 |
1980年 | 25篇 |
1979年 | 7篇 |
1978年 | 12篇 |
1977年 | 14篇 |
1976年 | 10篇 |
1975年 | 18篇 |
1974年 | 5篇 |
1973年 | 4篇 |
排序方式: 共有1396条查询结果,搜索用时 760 毫秒
121.
122.
An improved catheter for pulmonary arteriography via the antecubital approach is described. The catheter has been used successfully in 56 patients. 相似文献
123.
124.
125.
Sanne C Hammer Charlotte MHHT Robroeks Christian van Rij Jan Heynens Richard Droog Quirijn Jöbsis Han JE Hendriks Edward Dompeling 《Pediatric allergy and immunology》2008,19(7):626-633
Several epidemiological studies described poor asthma control in children. However, the diagnosis of childhood asthma in these studies is uncertain, and asthma control in children of an outpatient clinic population during treatment by a paediatrician is unknown. (1) to investigate the hypothesis that asthma control in a paediatric outpatient clinic population is better than epidemiological surveys suggest; (2) to find possible explanations for suboptimal asthma control. Asthmatic children aged 6–16 years, known for at least 6 months by a paediatrician at the outpatient clinic, were selected. During a normal visit, both the responsible physicians and parent/children completed a standardised questionnaire about asthma symptoms, limitation of daily activities, treatment, asthma attacks and emergency visits. Overall, excellent asthma control of 8.0% in this study was not significantly better than of 5.8% in the European AIR study (Chi‐square, p = 0.24). Separate GINA goals like minimal chronic symptoms and no limitation of activities were better met in our study. Good to excellent controlled asthma was perceived by most children/parents (83%), but was less frequently indicated by the paediatrician (73%), or by objective criteria of control (45%) (chi‐square, p = 0.0001). The agreement between patient‐perceived and doctor assessed control was low, but improved in poorly controlled children. Patients were not able to perceive the difference between ‘excellent asthma control’ and ‘good control’ (p = 0.881).Too little children with uncontrolled disease got step‐up of their asthma treatment. Although separate GINA goals like ‘minimal chronic symptoms’ and ‘no limitation of activities’ were significantly better in our study, overall, asthma control in this outpatient clinic population, treated by a paediatrician, was not significantly better than in the European AIR study. Poorly controlled disease was related to several aspects of asthma management, which are potentially accessible for improvements. 相似文献
126.
127.
Adverse effects of the transfusion of homologous blood on tumor recurrence and resistance to bacterial infection have been reported previously, but the findings are inconclusive. A retrospective review of patients undergoing orthopedic surgery was conducted, and the rate of the postoperative infectious complications was compared among those receiving homologous blood, autologous blood, both types, or no transfusion support. An overall postoperative infection rate of 6.1 percent was observed: 6.9 percent among persons receiving homologous blood, 5.0 percent among those receiving autologous blood, 11.9 percent among those receiving both homologous and autologous blood, and 4.9 percent among those not receiving transfusions (p = 0.37). Among patients receiving homologous blood, a subset of 15 patients received homologous whole blood and had an infection rate of 20 percent. Significant predictors of postoperative infection included increasing age, spinal surgery, high admission hematocrit, and greater time in surgery. Of factors relating to transfusion, only the use of homologous whole blood was a significant predictor of postoperative infection, which suggests a detrimental effect of homologous plasma. It can be concluded that, in this group of patients undergoing relatively nontraumatic surgery, several variables that are not related to transfusion, as well as the use of homologous whole blood, were significant predictors of postoperative infection. 相似文献
128.
Andrea K. Viecelli Emma O’Lone Benedicte Sautenet Jonathan C. Craig Allison Tong Eric Chemla Lai-Seong Hooi Timmy Lee Charmaine Lok Kevan R. Polkinghorne Robert R. Quinn Tushar Vachharajani Raymond Vanholder Li Zuo Ashley B. Irish Trevor A. Mori Elaine M. Pascoe David W. Johnson Carmel M. Hawley 《American journal of kidney diseases》2018,71(3):382-391
129.
OBJECTIVE: To examine differences by physician gender in the identification and treatment of childhood psychosocial problems. DESIGN: Survey of patients (n = 19,963) and physicians (n = 366) in primary care offices in 2 large, practice-based research networks. Multivariate regressions were used to control for patient, physician, and visit characteristics, with a correction for the clustered sample. SUBJECTS: Children ages 4 to 15 years seen consecutively for nonemergent care. MEASURES: Physician report of attitudes, training, practice factors, and identification and treatment of psychosocial problems. Parental report of demographics and behavioral symptoms. RESULTS: Compared with male physicians, female physicians were less likely to view care for psychosocial problems as burdensome. They were more likely to see children who were female, younger, black or Hispanic, in single-parent households, enrolled in public or managed health plans, and with physical health limitations. Children seen by male physicians had higher symptom counts. Male physicians were more likely to report having primary care responsibility for their patient and that parents agree with their care plan. Female physicians spent more time with patients. After controlling for these differences, female physicians did not differ from male physicians in identification or treatment of childhood psychosocial problems. CONCLUSIONS: Male and female physicians see different kinds of children for different visit purposes and have different kinds of relationships with their patients. After controlling for these factors, management of childhood psychosocial problems does not differ by physician gender. Improving management of psychosocial conditions depends on identifying modifiable factors that affect diagnosis and treatment; our work suggests that characteristics of the practice environment, physician-patient relationship, and patient self-selection deserve more research. 相似文献
130.
Combined oral lysine acetylsalicylate and metoclopramide in the acute treatment of migraine: a multicentre double-blind placebo-controlled study 总被引:3,自引:0,他引:3
H Chabriat JE Joire J Danchot P Grippon MG Bousser 《Cephalalgia : an international journal of headache》1994,14(4):297-300
This multicentre, double-blind, randomized, placebo-controlled, parallel study was designed to evaluate the efficacy of combined oral lysine acetylsalicylate and metoclopramide (LAS-MCP) in the acute treatment of migraine attacks. A total of 266 patients, 18–65 years old, with two to six attacks of migraine with or without aura (IHS criteria) per month were included. The patients had to treat two migraine attacks with LAS-MCP (1620 mg lysine acetylsalicylate-the equivalent of 900 mg aspirin- combined with 10 mg metoclopramide) or placebo. The main outcome measure was headache relief (reduction in headache severity from grade 3 or 2-severe or moderate-to grade 1 or 0-mild or none) 2 h after treatment. LAS-MCP was superior to placebo for headache relief (56% vs 28%) and for the following secondary outcome measures: complete headache relief (18% vs 7%; p < 0.001), nausea (28% vs 44%; p < 0.001), vomiting (3% vs 11%; p = 0.001), use of rescue medication (47% vs 68%; p < 0.001), global efficacy judged as good or excellent (32% vs 14%; p < 0.001). The tolerability was considered as good in 94% of treated attacks in both groups. Combined oral lysine acetylsalicylate and metoclopramide is an effective and well-tolerated acute treatment of migraine attacks. 相似文献