首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4147篇
  免费   158篇
  国内免费   28篇
耳鼻咽喉   22篇
儿科学   57篇
妇产科学   84篇
基础医学   141篇
口腔科学   27篇
临床医学   504篇
内科学   79篇
皮肤病学   10篇
神经病学   215篇
特种医学   40篇
外科学   1018篇
综合类   831篇
预防医学   190篇
眼科学   2篇
药学   855篇
中国医学   227篇
肿瘤学   31篇
  2023年   40篇
  2022年   71篇
  2021年   81篇
  2020年   74篇
  2019年   78篇
  2018年   61篇
  2017年   104篇
  2016年   96篇
  2015年   77篇
  2014年   239篇
  2013年   204篇
  2012年   250篇
  2011年   295篇
  2010年   243篇
  2009年   237篇
  2008年   242篇
  2007年   233篇
  2006年   193篇
  2005年   160篇
  2004年   137篇
  2003年   136篇
  2002年   86篇
  2001年   78篇
  2000年   67篇
  1999年   73篇
  1998年   54篇
  1997年   48篇
  1996年   54篇
  1995年   46篇
  1994年   46篇
  1993年   42篇
  1992年   40篇
  1991年   34篇
  1990年   33篇
  1989年   25篇
  1988年   24篇
  1987年   41篇
  1986年   29篇
  1985年   28篇
  1984年   30篇
  1983年   23篇
  1982年   21篇
  1981年   35篇
  1980年   35篇
  1979年   18篇
  1978年   19篇
  1977年   12篇
  1975年   8篇
  1974年   8篇
  1973年   7篇
排序方式: 共有4333条查询结果,搜索用时 31 毫秒
1.
2.
李继  陈堃  柯希建  万里 《骨科》2019,10(6):534-538
目的 探讨超声引导下胸腰筋膜间平面(thoracolumbar interfascial plane, TLIP)阻滞对后路腰椎融合手术病人术后镇痛效果的影响。方法 前瞻性选择2017年4月至2018年5月在我院择期行后路腰椎融合手术病人50例。采用随机数字表法分为两组,每组25例,TLIP阻滞联合静脉自控镇痛(patient controlled intravenous analgesia, PCIA)组(TLIP组)和单纯PCIA组(对照组)。TLIP组,男12例,女13例,年龄为(49.4±7.7)岁;对照组,男10例,女15例,年龄为(49.5±7.1)岁。TLIP组在全麻诱导后行超声引导下双侧TLIP阻滞,每侧注入0.375%罗哌卡因20 ml。两组术后均使用舒芬太尼行PCIA,维持术后24 h内静息疼痛视觉模拟量表(visual analogue scale, VAS)评分≤3分。记录两组病人围手术期阿片类药物用量及补救镇痛例数,术后2、4、6、12、24 h的静息VAS评分和Ramsay镇静评分,术后24 h 内恶心呕吐、头晕、瘙痒和呼吸抑制的发生情况以及TLIP组阻滞相关并发症的发生情况。结果 与对照组比较,TLIP组术中瑞芬太尼用量及术后24 h内PCIA舒芬太尼用量明显减少(P<0.05),术后恶心呕吐发生率明显降低(P<0.05),两组均未行补救镇痛。两组间各时间点静息VAS评分和Ramsay镇静评分,以及术后头晕、瘙痒和呼吸抑制等发生率的差异均无统计学意义(P均>0.05),TLIP组未发生阻滞相关并发症。结论 超声引导下TLIP阻滞可减少后路腰椎融合术病人围术期阿片类药物用量,降低术后恶心呕吐的发生率。  相似文献   
3.
4.

Objective

Postoperative pain control is important in terms of early recovery and rehabilitation in arthroscopic meniscectomy. For this purpose, we aimed to compare the effects of intraarticular tramadol, magnesium, and ketamine with combinations of pericapsular bupivacaine on postoperative pain and recovery in arthroscopic meniscectomy.

Methods

Ninety patients who underwent arthroscopic meniscectomy were enrolled in the study. Group T was given tramadol, Group K was given ketamine, and Group M was given magnesium reconstituted intraarticularly, and all groups received periarticular bupivacaine. Comparisons were made in terms of the patients’ postoperative Visual Analogue Scale scores with and without movement, need for additional analgesics, first analgesic time, mobilization times, adverse effects, and satisfaction with the analgesics.

Results

The Visual Analogue Scale scores were lowest in Group T at 0 minutes, and were higher in the 15th and 30th minutes and 1st, 2nd, and 6th hours. Visual Analogue Scale values with movement were found to be high in Group M at 0 and 15 minutes, but they were found to be higher in group T in the 30th minute, 1st, 2nd and 6th hour. The groups were similar in terms of postoperative additional analgesic use, number of analgesic use, and satisfaction with analgesics; however, the first analgesic time was earlier in Group M, and the first mobilization time was earlier in Group K.

Conclusion

Intraarticular ketamine enables early mobilization and less need for additional analgesics, it also provides a better analgesic effect in comparison with intraarticular tramadol and magnesium.  相似文献   
5.
6.

Study objective

We compare the analgesic efficacy and safety of subdissociative intravenous-dose ketamine (SDK) versus morphine in geriatric Emergency Department (ED) patients.

Methods

This was a prospective, randomized, double-blind trial evaluating ED patients aged 65 and older experiencing moderate to severe acute abdominal, flank, musculoskeletal, or malignant pain. Patients were randomized to receive SDK at 0.3?mg/kg or morphine at 0.1?mg/kg by short intravenous infusion over 15?min. Evaluations occurred at 15, 30, 60, 90, and 120?min. Primary outcome was reduction in pain at 30?min. Secondary outcomes included overall rates of adverse effects and incidence of rescue analgesia.

Results

Thirty patients per group were enrolled in the study. The primary change in mean pain scores was not significantly different in the ketamine and morphine groups: 9.0 versus 8.4 at baseline (mean difference 0.6; 95% CI ?0.30 to 1.43) and 4.2 versus 4.4 at 30?min (mean difference ?0.2; 95% CI ?1.93 to1.46). Patients in the SDK group reported higher rates of psychoperceptual adverse effects at 15, 30, and 60?min post drug administration. Two patients in the ketamine group and one in the morphine group experienced brief desaturation episodes. There were no statistically significant differences with respect to changes in vital signs and need for rescue medication.

Conclusion

SDK administered at 0.3?mg/kg over 15?min provides analgesic efficacy comparable to morphine for short-term treatment of acute pain in the geriatric ED patients but results in higher rates of psychoperceptual adverse effects.ClinicalTrials.gov Registration #: NCT02673372.  相似文献   
7.
Effective management and control of peri- and postoperative pain in hip surgery is essential in order to minimize the use of opioids and their adverse effects. Effective regional analgesia for hip pain is made particularly challenging by the complex innervation of the hip joint. Standard regional techniques can be associated with complications, including incomplete anesthesia, hypotension, or lower limb weakness. We present the case of a 5-year-old girl with a history of infantile cerebral palsy who underwent bilateral varus derotation osteotomy and adductor tenotomy due to paralytic dislocation. She received bilateral PENG block and femoral cutaneous nerve block - a simple technique that covers all the nerves involved in the sensory innervation of the joint capsule without the need for multiple injections.  相似文献   
8.
9.
IntroductionDural puncture epidural (DPE) analgesia is a modification of conventional epidural analgesia that involves the intentional puncture of the dura with a spinal needle through the needle placed in the epidural space, without a medication being injected intrathecally. There have been contradictory findings regarding better analgesia and better block quality.MethodsA systematic literature search was done to identify randomized controlled trials (RCT) comparing DPE with epidural analgesia. The risk of bias was assessed with the Cochrane tool. Risk ratio and 95% confidence intervals were calculated.ResultsFive RCTs including 581 patients were identified. One RCT on caesarean section was excluded. Single studies suggested slightly better analgesia by finding a median time to achieve sufficient analgesia of two minutes less in the DPE group, a higher number of women having a pain score <10/100 at 20 min, a reduction in the number of epidural top-ups and better sacral spread. The studies did not show a difference between DPE and epidural analgesia for catheter replacement or manipulation rates, the incidence of intravascular placement or unilateral block.ConclusionThere is a lack of clear evidence on either the benefits or the risks of the DPE technique, such that a recommendation for or against its routine use is premature. Two of the three studies showing a beneficial effect of DPE came from the same institution and replication of the findings by other groups is warranted.  相似文献   
10.
ObjectivesWe aimed to describe the analgesic efficacy, duration of analgesia, and adverse event profile associated with intranasal hydromorphone in children with acute pain presenting to an emergency department.MethodsProspective dose titration pilot study of otherwise healthy children 4 to 17-years-old with moderate to severe pain who required a parenteral opioid. All patients received an initial intranasal hydromorophone dose of 0.03 mg/kg. The need for additional analgesia was assessed at 15 and 30 min; an additional 0.015 mg/kg was given at each assessment, if required. Need for rescue analgesic, pain intensity and adverse events were assessed until 6 h after hydromorphone administration or until patients were discharged, underwent a procedure to treat their painful condition, or received a rescue analgesic.ResultsWe enrolled 35 children. Fifteen, 11, and 9 children required a total dose of 0.03, 0.045, and 0.06 mg/kg, respectively. Patients in each dose group experienced an absolute decrease in pain score of ≥3/10 and percent reduction >40% within 5–15 min of completing dose-titration administration of hydromorphone. Duration of analgesia (i.e. time until rescue analgesic administered) >1 h was observed in 85.7% of patients. Patients not requiring rescue analgesics had mild or no pain until discharged or their painful conditions were treated. Three (8.6%) patients required a rescue analgesic <1 h after hydromorphone administration. There were no major adverse events.ConclusionsIntranasal hydromorphone led to rapid, clinically significant and frequently sustained decreases in pain intensity in children. No major adverse events were observed in this preliminary sample.Clinical Trials Registration Number: NCT02437669  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号