全文获取类型
收费全文 | 10155篇 |
免费 | 740篇 |
国内免费 | 211篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 355篇 |
妇产科学 | 276篇 |
基础医学 | 569篇 |
口腔科学 | 262篇 |
临床医学 | 1546篇 |
内科学 | 1217篇 |
皮肤病学 | 51篇 |
神经病学 | 323篇 |
特种医学 | 695篇 |
外国民族医学 | 2篇 |
外科学 | 2296篇 |
综合类 | 1478篇 |
现状与发展 | 1篇 |
预防医学 | 456篇 |
眼科学 | 196篇 |
药学 | 600篇 |
13篇 | |
中国医学 | 471篇 |
肿瘤学 | 276篇 |
出版年
2024年 | 19篇 |
2023年 | 199篇 |
2022年 | 377篇 |
2021年 | 493篇 |
2020年 | 442篇 |
2019年 | 422篇 |
2018年 | 408篇 |
2017年 | 374篇 |
2016年 | 377篇 |
2015年 | 363篇 |
2014年 | 739篇 |
2013年 | 712篇 |
2012年 | 561篇 |
2011年 | 663篇 |
2010年 | 498篇 |
2009年 | 467篇 |
2008年 | 422篇 |
2007年 | 491篇 |
2006年 | 410篇 |
2005年 | 347篇 |
2004年 | 311篇 |
2003年 | 212篇 |
2002年 | 212篇 |
2001年 | 189篇 |
2000年 | 154篇 |
1999年 | 146篇 |
1998年 | 109篇 |
1997年 | 111篇 |
1996年 | 104篇 |
1995年 | 102篇 |
1994年 | 73篇 |
1993年 | 61篇 |
1992年 | 53篇 |
1991年 | 52篇 |
1990年 | 46篇 |
1989年 | 25篇 |
1988年 | 45篇 |
1987年 | 30篇 |
1986年 | 26篇 |
1985年 | 45篇 |
1984年 | 42篇 |
1983年 | 24篇 |
1982年 | 32篇 |
1981年 | 33篇 |
1980年 | 20篇 |
1979年 | 15篇 |
1978年 | 13篇 |
1977年 | 8篇 |
1976年 | 16篇 |
1973年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 19 毫秒
61.
胎儿腹壁异常的超声诊断 总被引:5,自引:0,他引:5
本文总结了胎儿腹壁异常12例,其中脐疝4例,腹壁缺损4例、膈疝3例、胸腹壁缺损1例。分析了超声图像特点及漏诊、误诊原因,并提出鉴别诊断要点及最早诊断时间。对分娩方式及时间选择有重要意义。 相似文献
62.
Shunya Shindo Kouji Ogata Seiichiro Katahira Keiji Iyori Tadao Ishimoto Masahiro Kobayashi Osamu Suzuki Kihachiro Kamiya Yusuke Tada 《Surgery today》1997,27(1):76-79
Delayed manifestation of aortic stenosis caused by abdominal blunt trauma is rare. We report herein the case of a 67-year-old man who was taken to a nearby hospital after being crushed between a heavy truck and a wall. An emergency laparotomy was performed, revealing only a mesenteric tear which was repaired. He was discharged after an uneventful postoperative course; however, 1 month later he began to experience intermittent claudication, and presented to our hospital in December 1994, 1 year after the first operation. Angiography and enhanced computed tomography (CT) demonstrated infrarenal abdominal aortic dilatation with distal stenosis. Both the dilated and stenotic lesions were resected and bypass surgery was performed. Pathologic examination demonstrated that the intima had been lacerated circumferentially and everted distally, causing the aortic stenosis. To our knowledge, this is the first case of the delayed manifestation of traumatic aortic stenosis to be documented in Japan. The etiology of this rare complication of blunt trauma is described in this report. 相似文献
63.
作者测量了新疆地区768例3~7岁维吾尔族、汉族儿童心脏径线。心脏横径6岁组维吾尔族大于汉族。不分年龄组左心横径、心横径、心深径维吾尔族大于汉族,左侧位心膈交点至前胸膜面的距离维吾尔族女童大于汉族女童。两民族心横径与心脏体积的相关系数分别大于心脏深径与心脏体积的相关系数。本文提供了新疆地区3~7岁维吾尔族、汉族儿童各年龄组和不分年龄组心脏径线的正常数据。 相似文献
64.
目的 比较短期化疗前后兔腹主动脉顺应性的变化,了解化疗药物对血管力学特性的影响。方法将15只新西兰兔随机等分为5组,其中4组接受1周期化疗(卡铂100mg/m^2,第1、3、5天;异环磷酰胺1500mg/m^2,第1、3、5天;足叶乙贰100mg/m^2,第l~3天),另1组为对照组。分别测量各组兔腹主动脉比顺应性(化疗组分为化疗后第2、7、14、21天进行观察)。结果短期化疗前后兔腹主动脉顺应性显著变化,化疗后第14天下降最明显,而第21天则基本恢复。结论短期化疗能够降低兔腹主动脉比顺应性,降低的程度与化疗后时间相关,并具有可逆行性。 相似文献
65.
目的 明确妇科腹腔内出血的临床特征 ,以减少误诊。方法 对我院 1999年 1月至 2 0 0 1年 12月以妇科腹腔内出血收治的 186例患者的临床资料进行回顾性分析。结果 186例病人包括 5种疾病 ,其中异位妊娠、卵巢破裂、出血性输卵管炎及腹部卒中易相互误诊。本资料 15 0例经手术止血 ,36例经保守治疗成功 ,无 1例死亡。结论 详细询问病史 ,血HCG检测和阴道B超检查 ,后穹窿或腹腔穿刺是简便而重要的诊断手段。 相似文献
66.
67.
Haruhiro INOUE Yukihiko MURAOKA Kimiya TAKESHITA Narihide GOSEKI Mitsuo ENDO 《Digestive endoscopy》1993,5(3):289-292
Abstract: Since April 1991, we have studied 160 patients who had had a successful laparoscopic cholecystectomy. Nine patients who presented with chronic cholecystitis with severe local adhesion and who were also considered to require a longer operative time were selected as suitable candidates for this procedure. They were successfully treated under a zero- to four-mmHg low-pressured pneumoperitoneum procedure combined with total abdominal wall lifting using a disposable, flexible vinyl tube retractor. This method enabled exactly the same clear laparoscopic vision as is possible in the routinely-used high-pressure pneumoperitoneum even in the marginal portions of the abdominal cavity. Moreover, it facilitated early reinsufflation after the cauterization-produced smoke was exhausted, which minimized the operative time and reduced the surgeon's anxiety concerning the maintenance of a sufficiently airtight condition. We believe that this low-pressure pneumopeqitoneum procedure also benefits the poor-risk patient who has restricted cardiopulmonary function, especially during advanced laparoscopic surgery which requires a longer operative and anesthetic time. 相似文献
68.
Yu L. Liu Stephen J. Riederer Phillip J. Rossman Roger C. Grim Josef P. Debbins Richard L. Ehman 《Magnetic resonance in medicine》1993,30(4):507-511
A technique is described that provides improved reproducibility of breath-holding for MR image acquisition by monitoring the superior-inferior (S/I) position of the diaphragm. The method incorporates detection of the level of inspiration using an MR signal, rapid display to the patient of diaphragm position to enable breath-hold adjustment, and triggering of image data acquisition once appropriate position is attained. The response time of the system is short, approximately 10 ms. Studies in six volunteers using this method demonstrate a considerable decrease in the S/I range of diaphragm position over 10 consecutive periods of suspended respiration. The mean range is 1.3 mm with the system, while it is 8.3 mm without using it is expected that this method will be of assistance in many abdominal and cardiothoracic studies that use breath-hold techniques. 相似文献
69.
The aim of this study was to assess the effect of difference in tine diameter on probing pocket depth measurement. 2 sets of tines with Williams markings at 1, 2, 3, 5, 7, 8, 9 and 10 mm, and with a "round" tip, diameter 0.5 mm, were compared. One set was described as parallel-sided, the other as tapered. The parallel-sided tine was almost parallel from the 10 mm marking to the tip (tip diameter mean = 0.46 mm, 95% C.I. 0.456-0.464), while the corresponding diameter for the tapered tine varied (tip diameter mean = 0.48 mm, 95% C.I. 0.473-0.489). Calibration markings appeared highly consistent with the expected value to within 0.01 mm. The tines were mounted in Brodontic handles at 0.25 N. Examiner probing repeatability yielded kappa 0.86 for "parallel-sided" and 0.81 for "tapered" tines in vivo. 412 approximal pockets were assessed in 53 patients with routine chronic adult periodontitis, mean age 42.1 years. Each site had a probing depth of greater than or equal to 5 mm, PlI less than or equal to 1, GI less than or equal to 1, PBI less than or equal to 1. Each site was probed 2x with a 15-min interval. At the first 251 sites, the parallel-sided tine was used initially, and the tapered at the remaining 161 sites. Results indicated a highly significant tendency for the parallel-sided tine to yield a deeper reading when a difference occurred. These findings indicate that with adequate training providing high examiner repeatability, one source of error in probing data can be minimised. 相似文献
70.
Effects of epidural bupivacaine and epidural morphine on bowel function and pain after hysterectomy 总被引:2,自引:0,他引:2
T. THORÉN A. SUNDBERG M. WATTWIL J.–E. GARVILL U. JÜRGENSEN 《Acta anaesthesiologica Scandinavica》1989,33(2):181-185
A comparison was made of the effects of continuous epidural analgesia with bupivacaine and intermittent epidural morphine on bowel function after abdominal hysterectomy. The duration of postoperative ileus was assessed as the time from the end of operation to the first postoperative passage of flatus and feces. Twenty-two patients were randomly allocated to two equal groups. An "epidural morphine" group received general anesthesia and epidural morphine for postoperative pain relief, and an "epidural bupivacaine" group was given combined general anesthesia and epidural anesthesia with 0.5% bupivacaine intraoperatively and epidural analgesia with 0.25% bupivacaine postoperatively. Epidural morphine or bupivacaine was given for 42 h postoperatively. Pain intensity (visual analog scale) was low in both groups, but lower (P less than 0.05) in the epidural bupivacaine group. The time to first passage of flatus was 22 +/- 16 h in the epidural bupivacaine group and 56 +/- 22 h in the epidural morphine group (P less than 0.001). The time to first postoperative passage of feces was shorter (P less than 0.05) in the former than in the latter 57 +/- 44 h vs 92 +/- 22 h). The patients of the epidural bupivacaine group started intake of oral fluids earlier (P less than 0.01) and to a greater extent (P less than 0.05) than those in the epidural morphine group. It is concluded that the duration of postoperative ileus after hysterectomy is shorter when epidural bupivacaine is given for postoperative pain relief than when this is achieved by epidural morphine. 相似文献