全文获取类型
收费全文 | 75669篇 |
免费 | 6155篇 |
国内免费 | 1173篇 |
专业分类
耳鼻咽喉 | 386篇 |
儿科学 | 1155篇 |
妇产科学 | 1498篇 |
基础医学 | 3223篇 |
口腔科学 | 2016篇 |
临床医学 | 19836篇 |
内科学 | 5766篇 |
皮肤病学 | 376篇 |
神经病学 | 4277篇 |
特种医学 | 1566篇 |
外国民族医学 | 6篇 |
外科学 | 10251篇 |
综合类 | 9644篇 |
现状与发展 | 3篇 |
一般理论 | 6篇 |
预防医学 | 12130篇 |
眼科学 | 303篇 |
药学 | 6199篇 |
171篇 | |
中国医学 | 2530篇 |
肿瘤学 | 1655篇 |
出版年
2024年 | 193篇 |
2023年 | 1658篇 |
2022年 | 2821篇 |
2021年 | 3884篇 |
2020年 | 4326篇 |
2019年 | 3319篇 |
2018年 | 3095篇 |
2017年 | 3107篇 |
2016年 | 2979篇 |
2015年 | 2898篇 |
2014年 | 6331篇 |
2013年 | 6556篇 |
2012年 | 4910篇 |
2011年 | 5087篇 |
2010年 | 4163篇 |
2009年 | 3625篇 |
2008年 | 3832篇 |
2007年 | 3308篇 |
2006年 | 3028篇 |
2005年 | 2349篇 |
2004年 | 2013篇 |
2003年 | 1595篇 |
2002年 | 1221篇 |
2001年 | 1001篇 |
2000年 | 812篇 |
1999年 | 718篇 |
1998年 | 619篇 |
1997年 | 533篇 |
1996年 | 417篇 |
1995年 | 343篇 |
1994年 | 319篇 |
1993年 | 270篇 |
1992年 | 241篇 |
1991年 | 209篇 |
1990年 | 124篇 |
1989年 | 134篇 |
1988年 | 116篇 |
1987年 | 118篇 |
1986年 | 114篇 |
1985年 | 130篇 |
1984年 | 96篇 |
1983年 | 81篇 |
1982年 | 79篇 |
1981年 | 68篇 |
1980年 | 53篇 |
1979年 | 27篇 |
1978年 | 22篇 |
1977年 | 14篇 |
1976年 | 19篇 |
1975年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
Twenty-five women receiving sedation for outpatient hysteroscopic polypectomy were injected with 0.25% bupivacaine 10 mL (paracervical group) and another 25 received the same volume of saline (control group) at the cervical fornix. Both groups were given target-controlled propofol sedation during the procedure. More propofol (mg/min) was needed for adequate anesthesia in the control group compared to the paracervical group (6.5 versus 4.6). In addition, the postoperative pain scores were lower in the paracervical group than in the control group. Hemodynamic changes and postoperative side effects were similar in the two groups. This prospective, randomized, double-blind, placebo-controlled study confirmed the effective use of paracervical blocks. This approach has the effect of reducing the amount of intraoperative propofol and decreasing postoperative pain in outpatient hysteroscopic surgery. 相似文献
122.
Future perspectives and research initiatives in fast-track surgery 总被引:10,自引:0,他引:10
Henrik Kehlet 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》2006,391(5):495-498
Background and aims Major surgery is still followed by a risk of morbidity, a need for hospitalisation and convalescence. Fast-track surgery has been introduced as a coordinated effort to combine unimodal evidence-based principles of care into a multi-modal effort to enhance recovery. The aim of this article was to update recent data on fast-track abdominal surgery and outline future strategies for research.Results The data from fast-track colonic resection support the validity of the concept because pain, ileus, cardiopulmonary function and muscle function were all improved, compared with traditional treatment and with reduced post-operative fatigue and convalescence. Although less data is available, similar positive results may be achieved in other types of major surgery. Current research initiatives include improved multi-modal non-opioid analgesia, rational principles for perioperative fluid management, pharmacological reduction of surgical stress responses and the role of laparoscopic procedures within the fast-track concept.Conclusions Fast-track surgery has evolved as a valid concept to improve post-operative outcome. Further progress may be expected based upon intensified research within perioperative pathophysiology and a multi-disciplinary collaboration between surgeons, anaesthesiologists and surgical nurses. 相似文献
123.
Herniography has been used for 25 years in the diagnosis of occult herniation but has not gained widespread acceptance in
the UK, despite studies confirming its high sensitivity and specificity for occult hernias and an excellent record of safety
and patient acceptability. The traditional approach in the UK to suspected occult groin herniation has been surgical exploration.
This study examined the use of herniography in a single district general hospital to assess its impact in limiting unnecessary
groin explorations and allowing discharge of patients without hernias. The case notes of 90 successive patients referred for
herniography by the department of general surgery in a single UK district general hospital over an 18-month period were reviewed.
Eighty-seven completed examinations were analysed in which 23 hernias were diagnosed in 20 patients. Thirteen patients have
undergone hernia repair with resolution of symptoms. There were no false positive examinations, although two inguinal hernias
were incorrectly diagnosed radiologically as femoral hernias; there were two false negative examinations where additional
hernias were found at laparoscopic repair. There were no reported complications. Twenty-four patients were discharged directly
from the surgical clinic after a negative herniogram. Thirty patients were referred to other specialities. No patient had
undergone groin exploration after a negative herniogram. Herniography is a useful tool in assessing obscure groin pain and
potential occult herniation. It can reliably rule out the presence of a hernia and avoid the need for surgical exploration.
Many patients with a negative herniogram can be reassured and discharged, whilst others may be referred on to other specialities
safe in the knowledge that an occult hernia has been excluded. 相似文献
124.
This paper considers a dynamic pricing problem over a finite horizon where demand for a product is a time‐varying linear function of price. It is assumed that at the start of the horizon there is a fixed amount of the product available. The decision problem is to determine the optimal price at each time period in order to maximize the total revenue generated from the sale of the product. In order to obtain structural results we formulate the decision problem as an optimal control problem and solve it using Pontryagin's principle. For those problems which are not easily solvable when formulated as an optimal control problem, we present a simple convergent algorithm based on Pontryagin's principle that involves solving a sequence of very small quadratic programming (QP) problems. We also consider the case where the initial inventory of the product is a decision variable. We then analyse the two‐product version of the problem where the linear demand functions are defined in the sense of Bertrand and we again solve the problem using Pontryagin's principle. A special case of the optimal control problem is solved by transforming it into a linear complementarity problem. For the two‐product problem we again present a simple algorithm that involves solving a sequence of small QP problems and also consider the case where the initial inventory levels are decision variables. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
125.
Mark S. Wallace Steven G. Charapata Robert Fisher Michael Byas‐Smith Peter S. Staats Martha Mayo Dawn McGuire David Ellis 《Neuromodulation》2006,9(2):75-86
Objective. The safety and efficacy of intrathecal (IT) ziconotide was studied in a randomized, double‐blind, placebo‐controlled trial. Materials and Methods. Patients (169 ziconotide, 86 placebo) with severe chronic nonmalignant pain unresponsive to conventional therapy and a visual analog scale of pain intensity (VASPI score) ≥ 50 mm were treated over a 6‐day period in an inpatient hospital setting. Initial starting dose was 0.4 µg/hour and was titrated to analgesia or intolerance (maximum dose 7.0 µg/hour). The starting and maximum doses were reduced to 0.1 µg/hour and 2.4 µg/hour, respectively, due to adverse events (AEs). Results. The mean percent reduction in VASPI score from baseline was 31.2% and 6.0% for ziconotide‐ and placebo‐treated patients, respectively (p ≤ 0.001). During the initial titration phase, a significantly greater percentage of patients in the ziconotide group compared to the placebo group reported AEs, including abnormal gait, amblyopia, dizziness, nausea, nystagmus, pain, urinary retention, and vomiting. Conclusion. Ziconotide provided significant analgesia in patients for whom conventional therapy failed. However, there was a considerable incidence of ziconotide‐associated AEs due to the rapid titration and high doses administered. 相似文献
126.
目的探讨一对一责任助产加笑气吸入对分娩镇痛的疗效。
方法将576例产妇随机分为观察组和对照组.每组288例,两组均采用一对一责任助产及其他产科处理措施,观察组同时给予笑气吸入.观察两组的产痛程度、产程时间、分娩方式、笑气对新生儿的影响、产后出血及尿潴留等。
结果观察组无痛分娩率达95.8%.而对照组则为0(P〈0.01),观察组的产程时间短于对照组(P〈0.01)。
结论笑气吸入分娩镇痛产程时间短,对母婴均无不良影响,加一对一责任助产.是一种理想的分娩方法,值得产科临床推广使用。 相似文献
127.
经皮激光椎间盘减压术治疗椎间盘源性腰痛 总被引:1,自引:0,他引:1
目的探讨经皮激光椎间盘减压术(percutaneous laser disc decompression,PLDD)治疗椎间盘源性腰痛的疗效。方法2002年6月~2004年12月我院对36例椎间盘源性腰痛,采用英国DIOMED公司半导体激光仪,激光功率15W,每个激光脉冲持续1s,间隔1s,照射能量800~1200J。VAS评分评价治疗效果。结果手术时间15~60min,平均30min。32例出现“疼痛复制效应”。36例随访6~36个月,平均11个月,32例有效(术后VAS评分改善≥3分18例,≥分14例),4例无效,有效率88.9%(32/36)。结论PLDD治疗椎间盘源性腰痛安全、有效、微创。 相似文献
128.
[目的]针对食物中毒事件追查源头的困难局面,探索1种新的食物中毒追查方法。[方法]通过分析各种常见类型食物中毒的潜伏期,结合各种实际情况,探讨存样食物保存的时间和方法。[结果]存样食物至少要保存24h。[结论]这种存样待检方法有其先进性,但仍存在不少问题,需进一步改进。 相似文献
129.
130.