全文获取类型
收费全文 | 6082篇 |
免费 | 545篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 26篇 |
儿科学 | 265篇 |
妇产科学 | 93篇 |
基础医学 | 825篇 |
口腔科学 | 126篇 |
临床医学 | 811篇 |
内科学 | 1318篇 |
皮肤病学 | 89篇 |
神经病学 | 509篇 |
特种医学 | 512篇 |
外科学 | 677篇 |
综合类 | 114篇 |
一般理论 | 3篇 |
预防医学 | 511篇 |
眼科学 | 82篇 |
药学 | 421篇 |
2篇 | |
中国医学 | 3篇 |
肿瘤学 | 321篇 |
出版年
2022年 | 36篇 |
2021年 | 52篇 |
2020年 | 43篇 |
2019年 | 64篇 |
2018年 | 95篇 |
2017年 | 66篇 |
2016年 | 71篇 |
2015年 | 91篇 |
2014年 | 139篇 |
2013年 | 177篇 |
2012年 | 217篇 |
2011年 | 206篇 |
2010年 | 200篇 |
2009年 | 176篇 |
2008年 | 216篇 |
2007年 | 275篇 |
2006年 | 239篇 |
2005年 | 262篇 |
2004年 | 204篇 |
2003年 | 199篇 |
2002年 | 184篇 |
2001年 | 209篇 |
2000年 | 166篇 |
1999年 | 154篇 |
1998年 | 183篇 |
1997年 | 208篇 |
1996年 | 173篇 |
1995年 | 146篇 |
1994年 | 159篇 |
1993年 | 129篇 |
1992年 | 136篇 |
1991年 | 128篇 |
1990年 | 121篇 |
1989年 | 142篇 |
1988年 | 135篇 |
1987年 | 129篇 |
1986年 | 137篇 |
1985年 | 133篇 |
1984年 | 104篇 |
1983年 | 74篇 |
1982年 | 72篇 |
1981年 | 67篇 |
1980年 | 50篇 |
1979年 | 44篇 |
1978年 | 53篇 |
1977年 | 40篇 |
1976年 | 54篇 |
1975年 | 59篇 |
1974年 | 27篇 |
1973年 | 27篇 |
排序方式: 共有6708条查询结果,搜索用时 15 毫秒
31.
32.
Meniscal abnormalities: prospective correlation of double-contrast arthrography and arthroscopy 总被引:2,自引:0,他引:2
In a prospective study conducted over a 12-month period, 30 patients underwent double-contrast arthrography of the knee followed by arthroscopic study. An 80% correlation rate was found between results. Arthrography had a higher rate of accuracy (93%) than arthroscopy (84%) and had a 7% false-positive and 0% false-negative rate. A commonly overlooked arthrographic sign--the triple-S or stuck sail sign--was 91% accurate in the prediction of meniscal tears. The complementary nature of the two examinations is discussed. 相似文献
33.
Salvador A Brau Rick B Delamarter Michael L Schiffman Lytton A Williams Robert G Watkins 《The spine journal》2004,4(4):409-412
BACKGROUND CONTEXT: With the number of anterior lumbar procedures expected to increase significantly over the next few years, it is important for spine surgeons to have a good understanding about the incidence of vascular complications during these operations. PURPOSE: To determine the incidence of vascular injury in 1,315 consecutive cases undergoing anterior lumbar surgery at various levels from L2 to S1. STUDY DESIGN/SETTING: Patients undergoing anterior lumbar surgery were studied. PATIENT SAMPLE: A total of 1,310 consecutive patients undergoing 1,315 anterior lumbar procedures between August 1997 and December 2002 were included in the study. OUTCOME MEASURES: All patients were evaluated for incidence of vascular injury during and immediately after surgery. METHOD: A concurrent database was maintained on all these cases. All the patients had distal pulse evaluation preoperatively. Patients with venous injuries were further analyzed to determine location and extent of injury, amount of blood loss, completion of the procedure and postoperative sequelae. Patients with pulse deficits or evidence of ischemia during or immediately after surgery were further analyzed in particular in relation to demographic, preoperative variables and management. RESULTS: Six patients were identified as having left iliac artery thrombosis (0.45%), and 19 had major vein lacerations (1.4%). CONCLUSION: This study shows that the incidence of vascular injury is relatively low (25 in 1,315 or 1.9%). Because only five of these patients experienced significant sequelae from the approach, it appears that anterior lumbar surgery is quite safe, although it must be carried out with utmost respect for the vessels to avoid possible catastrophic outcomes. 相似文献
34.
Thirty-five posters were presented at the Workshop on Brain Uptake And Utilization Of Fatty Acids, Lipids, and Lipoproteins.
They were grouped into four categories: (1) mechanisms of lipid uptake and transport to the brain, (2) lipoproteins and polyunsaturated
fatty acids, (3) eicosanoids in brain function, and (4) fatty acids and lipids in brain disorders. This article summarizes
the highlights of the research presented in these posters. The individual abstracts follow these synopses. 相似文献
35.
36.
M. J. Stevens D.E. Goss A.V.M. Foster D. Pitei M.E. Edmonds P.J. Watkins 《Diabetic medicine》1993,10(10):909-915
The diabetic neuropathic ulcer is typically slow to heal and recurrent. Macrovascular insufficiency is usually excluded as foot pulses are present and ankle:brachial pressure ratios are not decreased. These assessments cannot however exclude more distal vascular disease. Digital pressure measurements enable a reliable assessment of the distal peripheral vascular status to be made. The aim of this study was therefore to use toe pressures to assess the contribution of distal ischaemia in the pathogenesis of the neuropathic ulcer. Sixteen diabetic patients with recurrent neuropathic foot ulceration had their toe pressures compared to 10 neuropathic patients without a history of foot ulceration, 10 diabetic control subjects, and 11 normal subjects. Four non-diabetic patients with neuropathy and foot ulceration were also assessed. All subjects had ankle:brachial pressure indices ≧ 1. Toe pressure was assessed using laser Doppler flowmetry to record the return of skin blood flow. The toe:brachial pressure index (TBI) was then calculated. The diabetic patients with a history of recurrent neuropathic ulceration, had the lowest mean TBI, 0.63 ± 0.14 (SD), compared to the non-ulcerated diabetic neuropathy patients, the diabetic control subjects, and the normal subjects. 0.84 ± 0.11, 0.82 ± 0.1, and 0.81 ± 0.07, p < 0.01, respectively. Three of the four non-diabetic patients with neuropathic foot ulceration also had an abnormally low TBI. Reduced toe pressure measurements are thus found to be associated with neuropathic foot ulceration. The contribution of distal ischaemia in the pathogenesis of the diabetic neuropathic foot ulcer needs to be evaluated. One hundred and eight non-insulin-dependent diabetic patients who had been tested for autonomic dysfunction in 1984/85 were re-evaluated 5 years later. Autonomic function was assessed by means of four cardiovascular tests (heart rate variation during deep breathing and standing, and blood pressure variation after standing and sustained handgrip). Eighteen subjects were lost to follow-up; in the 90 patients who completed the study, both the deep breathing and the handgrip test significantly worsened (respectively from 13.7 ± 7.8 to 11.6 ± 6.3 beats min?1 p < 0.01, and from 16.9 ± 8.2 to 12.7 ± 7.1 mmHg, p < 0.001), whereas both the 30:15 ratio and the variation of blood pressure on standing did not change. The impairment of a comprehensive evaluation score (from 2.5 ± 1.7 to 3.0 ± 1.5; p < 0.05) also confirmed the gradual deterioration of autonomic function over the study period. 相似文献
37.
Michlovitz SL Smith W Watkins M 《The Journal of orthopaedic and sports physical therapy》1988,9(9):301-304
* The views expressed in this article are those of the authors and do not reflect the official policy or position of the U.S. Public Health Service. The purpose of this investigation was to compare ice versus ice and high voltage pulsed stimulation (HVPS) for the treatment of ankle sprains. Thirty young adult subjects with grade I or II lateral ankle sprains were included in this study. Subjects received treatment within 30 hours following injury and were treated once daily for three days. Group I (N = 10) received ice for 30 minutes; group II (N = 10) received combination ice and HVPS (28 pps, negative polarity, current to comfort without contraction) for 30 minutes, and group III (N = 10) received ice and HVPS (80 pps, negative polarity, 30 minutes). All groups showed a tendency toward a decrease in pain, decrease in edema, and increase in ankle dorsiflexion following treatment. ANOVA for edema and dorsiflexion changes revealed that there were no significant differences in treatment effects among groups. HVPS, as utilized, did not further affect pain, edema, or range of dorsiflexion in the treatment of acute lateral ankle sprains.J Orthop Sports Phys Ther 1988;9(9):301-304. 相似文献
38.
Tortoriello DV; McGovern PG; Colon JM; Loughlin J; Santoro N 《Human reproduction (Oxford, England)》1998,13(11):3005-3008
We report an instance of critical ovarian hyperstimulation syndrome in a
highly responsive in-vitro fertilization patient despite the preventive
measure of a 4 day 'coast' interval during which no gonadotrophins were
administered while gonadotrophin-releasing hormone agonist therapy
continued until serum oestradiol concentrations fell below 3000 pg/ml.
相似文献
39.
40.
A randomized controlled trial of an information booklet for hypertensive patients in general practice 总被引:1,自引:2,他引:1 下载免费PDF全文
C.J. Watkins A.O. Papacosta S. Chinn J. Martin 《The British journal of general practice》1987,37(305):548-550
A randomized controlled trial of an information and medical record booklet designed to improve patient understanding and participation in the management of hypertension was conducted in six inner London general practices. After one year there were no significant differences between the group who had received the booklets and the control group in mean systolic or diastolic blood pressure, but the study group scored significantly higher on knowledge about hypertension and its management. However, the difference between the two groups was small, possibly because both groups started with a high level of understanding about hypertension and its management. In addition, the mean diastolic blood pressure in the control group showed that the treatment provided was already satisfactory, and that there was little need for improvement. Nevertheless, the information booklet evaluated in this study provides health professionals with a highly acceptable method of informing the patient about hypertension and its management and could be used both in hospital and general practice. 相似文献