全文获取类型
收费全文 | 2999篇 |
免费 | 256篇 |
国内免费 | 63篇 |
专业分类
耳鼻咽喉 | 97篇 |
儿科学 | 249篇 |
妇产科学 | 39篇 |
基础医学 | 333篇 |
口腔科学 | 160篇 |
临床医学 | 274篇 |
内科学 | 690篇 |
皮肤病学 | 82篇 |
神经病学 | 182篇 |
特种医学 | 337篇 |
外科学 | 192篇 |
综合类 | 156篇 |
预防医学 | 238篇 |
眼科学 | 13篇 |
药学 | 220篇 |
肿瘤学 | 56篇 |
出版年
2021年 | 40篇 |
2020年 | 14篇 |
2019年 | 29篇 |
2018年 | 41篇 |
2017年 | 28篇 |
2016年 | 38篇 |
2015年 | 36篇 |
2014年 | 60篇 |
2013年 | 84篇 |
2012年 | 76篇 |
2011年 | 103篇 |
2010年 | 69篇 |
2009年 | 90篇 |
2008年 | 104篇 |
2007年 | 133篇 |
2006年 | 122篇 |
2005年 | 132篇 |
2004年 | 94篇 |
2003年 | 91篇 |
2002年 | 96篇 |
2001年 | 110篇 |
2000年 | 93篇 |
1999年 | 91篇 |
1998年 | 89篇 |
1997年 | 97篇 |
1996年 | 77篇 |
1995年 | 81篇 |
1994年 | 49篇 |
1993年 | 67篇 |
1992年 | 71篇 |
1991年 | 89篇 |
1990年 | 77篇 |
1989年 | 119篇 |
1988年 | 88篇 |
1987年 | 95篇 |
1986年 | 71篇 |
1985年 | 73篇 |
1984年 | 48篇 |
1983年 | 28篇 |
1982年 | 31篇 |
1981年 | 39篇 |
1980年 | 35篇 |
1979年 | 39篇 |
1978年 | 23篇 |
1977年 | 32篇 |
1976年 | 19篇 |
1975年 | 15篇 |
1974年 | 15篇 |
1973年 | 12篇 |
1971年 | 10篇 |
排序方式: 共有3318条查询结果,搜索用时 15 毫秒
1.
2.
3.
Treatment of thrombocytopenia with alfa interferon 总被引:1,自引:0,他引:1
A M Lever M G Brook I Yap H C Thomas 《British medical journal (Clinical research ed.)》1987,295(6612):1519-1520
4.
The health care resource allocation debate. Defining our terms 总被引:1,自引:0,他引:1
The problem of health care distribution in the United States demands immediate action. Many different solutions have been proposed to slow rising health care costs and to improve access to care for the poor and uninsured. Debate among proponents of these various proposals might be advanced if a common language were adopted with regard to certain key terms instead of the various meanings currently assigned to these terms. For this reason, we propose and defend the following three definitions: (1) rationing is the societal toleration of inequitable access to health services acknowledged to be necessary by reference to necessary-care guidelines; (2) health care needs are desires for services that have been reasonably well demonstrated to provide significant net benefit for patients with specified clinical conditions; and (3) basic benefit plans are insurance packages that provide for all and only acknowledged health care needs, again by reference to appropriate clinical guidelines. 相似文献
5.
6.
7.
Familial homozygous hypercholesterolemia: clinical and cardiovascular features in 18 patients 总被引:2,自引:0,他引:2
G J Brook S Keidar M Boulos E Grenadier A Wiener N Shehada W Markiewicz A Benderli M Aviram 《Clinical cardiology》1989,12(6):333-338
Homozygous familial hypercholesterolemia (HFH) is a very rare autosomal dominant disease characterized by accelerated severe atherosclerosis. We examined 18 patients from 9 families with HFH. The age range was 6-30 years (mean = 16 years). Male to female ratio was equal. All patients had huge, multiple tuberous xanthomas on the skin and tendons. Mean +/- standard deviation of plasma cholesterol, triglycerides, low-density lipoproteins (LDL), and high-density lipoproteins (HDL) cholesterol levels were 608 +/- 89, 122 +/- 39, 550 +/- 88, and 26 +/- 8 mg/dl, respectively. Five patients (28%) had angina pectoris, two sustained a myocardial infarction, and one died at the age of 15 years. Two-dimensional echocardiography demonstrated supravalvular aortic stenosis in 3 of the 13 patients (23%). Coronary arteriography performed in 11 patients demonstrated significant obstruction in 6 patients, 2 each with single-, double-, and triple-vessel disease. Left main stenosis was present in 3 patients (27%). Supravalvular aortic narrowing was demonstrated in 6 patients (54%) and was associated with a gradient in 2 (25 and 35 mmHg, respectively). Segmental contraction abnormalities were detected in 2 of the 11 patients (18%). It is concluded that coronary artery disease is prevalent in patients with HFH and, based on the data presented, we recommend the performance of noninvasive technique, coronary arteriography and supravalvular aortography at an early age to detect and to follow the progression of the disease. 相似文献
8.
Evaluation of ambulatory care training by graduates of internal medicine residencies 总被引:1,自引:0,他引:1
In 1984, 154 physicians who had completed residencies in internal medicine at 15 major teaching hospitals in 1982 evaluated their residency training in ambulatory care. A majority of the physicians would have liked more experience in practical areas related to career planning and office management, more input from subspecialties such as orthopedics and dermatology, greater knowledge about the management of psychosocial problems, and more information about exercise and nutrition. Although many physicians also wanted more time devoted to several other topics, less than 20 percent recommended spending less time on 26 of the 27 topics being evaluated. Since these recommendations are similar to those reported in evaluation studies published over the past 25 years, it appears that training programs in internal medicine have not been successful in restructuring their curricula to meet many of the needs of practicing physicians. 相似文献
9.
10.
OBJECTIVE: To assess the utility and reliability of echocardiographic assessment of hemidiaphragm motion abnormalities in pediatric cardiothoracic patients. DESIGN: Retrospective observational study, with post hoc blinded assessment of echocardiographic and fluoroscopic results. SETTING: Tertiary care center. PATIENTS: Thirty-six consecutive pediatric cardiothoracic patients with suspected hemidiaphragm paralysis were identified and included in the study. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: The results of both echocardiographic and fluoroscopic studies on all patients were included. In addition, blinded review of study results were performed. The sensitivity and specificity of fluoroscopy in identifying hemidiaphragms that needed plication were 100% and 74%, respectively. The positive predictive value was 55%; negative predictive value was 100%. Comparing reported diagnoses with blinded review of the studies showed poor agreement; reviewers agreed with 89% diagnosed as normal, 44% of paralyzed, and 76% of paradoxical hemidiaphragms. The sensitivity and specificity of echo in identifying hemidiaphragms that needed plication were 100% and 81%, respectively. The positive predictive value and negative predictive value were 66% and 100%. Comparing reported diagnoses with blinded review, reviewers agreed with 97% diagnosed as normal, 81% of paralyzed, and 100% of paradoxical hemidiaphragms. Echocardiography was less accurate in discriminating between paralyzed and paradoxical diaphragm motion. Echocardiography was specific for paradoxical motion, since both patients identified by echocardiography were confirmed by fluoroscopy, but it was not sensitive. In nine patients, echo showed paralyzed motion that was identified by fluoroscopy as paradoxical. CONCLUSIONS: This study supports the use of echocardiography in the assessment of diaphragm function. When the diaphragms are clearly visualized by echo, as they are in the majority of cases, the addition of an additional fluoroscopic study adds no clinical value. The differentiation between paralyzed and paradoxical motion is unreliable by both imaging modalities. 相似文献