全文获取类型
收费全文 | 1886篇 |
免费 | 98篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 95篇 |
妇产科学 | 277篇 |
基础医学 | 133篇 |
口腔科学 | 45篇 |
临床医学 | 186篇 |
内科学 | 368篇 |
皮肤病学 | 45篇 |
神经病学 | 30篇 |
特种医学 | 146篇 |
外科学 | 137篇 |
综合类 | 141篇 |
预防医学 | 120篇 |
眼科学 | 10篇 |
药学 | 127篇 |
1篇 | |
中国医学 | 74篇 |
肿瘤学 | 52篇 |
出版年
2021年 | 16篇 |
2018年 | 15篇 |
2017年 | 19篇 |
2016年 | 16篇 |
2015年 | 34篇 |
2014年 | 49篇 |
2013年 | 50篇 |
2012年 | 63篇 |
2011年 | 66篇 |
2010年 | 66篇 |
2009年 | 55篇 |
2008年 | 59篇 |
2007年 | 62篇 |
2006年 | 52篇 |
2005年 | 41篇 |
2004年 | 33篇 |
2003年 | 25篇 |
2002年 | 24篇 |
2001年 | 34篇 |
2000年 | 18篇 |
1999年 | 35篇 |
1998年 | 52篇 |
1997年 | 56篇 |
1996年 | 50篇 |
1995年 | 47篇 |
1994年 | 56篇 |
1993年 | 37篇 |
1992年 | 29篇 |
1991年 | 35篇 |
1990年 | 28篇 |
1989年 | 40篇 |
1988年 | 34篇 |
1987年 | 38篇 |
1986年 | 34篇 |
1985年 | 20篇 |
1984年 | 19篇 |
1983年 | 20篇 |
1982年 | 18篇 |
1981年 | 23篇 |
1980年 | 16篇 |
1977年 | 10篇 |
1959年 | 35篇 |
1958年 | 58篇 |
1957年 | 87篇 |
1956年 | 45篇 |
1955年 | 75篇 |
1954年 | 67篇 |
1953年 | 16篇 |
1952年 | 14篇 |
1949年 | 10篇 |
排序方式: 共有1997条查询结果,搜索用时 15 毫秒
1.
2.
宫腹腔镜联合手术诊治不孕症150例分析 总被引:14,自引:0,他引:14
目的:探讨宫腹腔镜联合手术在诊治不孕症中的应用。方法:对150例不孕症患者行宫腹腔镜联合手术,对不孕症病因进行诊断,同时行治疗。结果:盆腔粘连和输卵管阻塞是不孕症的主要原因。子宫内膜息肉和正常盆腔占次要比例。子宫内膜异位症和多囊卵巢也是主要病因。150例同时行宫腹腔镜输卵管通液和各种疾病的治疗。联合手术后妊娠率为48.8%。结论:腹腔镜联合手术,在一次麻醉下,可以对不孕的原因全面评价和明确诊断,在诊断同时进行治疗,对不孕症的诊断和治疗有重大的意义,值得推广。 相似文献
3.
W F Rayburn M Z Johnson K L Hoffman S M Donn R M Nelson 《American journal of perinatology》1987,4(2):98-101
A goal for the obstetrician and neonatologist is to screen for risk factors associated with intraventricular hemorrhage (IVH) in the low-birthweight infant. Perinatal events that lead to neonatal metabolic and cardiovascular derangements seem to provoke IVH, and conflicting reports have implicated labor as being contributory. A fetal heart rate (FHR) abnormality during premature labor may be a predictor of subsequent neonatal IVH. For this reason, 5 years of FHR tracings at two university medical centers were reviewed for inborn infants who were delivered after premature labor and weighed less than or equal to 2000 gm. Sixty-four infants developed IVH, but pre-existing labor with a discernible FHR pattern was recorded in only 38 (59%) cases. Interpretations were reassuring in 17 (45%) cases, suspicious in 7 (18%) cases, and ominous in 14 (37%) cases. This proportion of FHR patterns was not significantly different from a matched group of premature infants without IVH during the same period. Interpretations of intrapartum FHR patterns of low-birthweight infants are limited, especially before 30 weeks gestation, and not useful in predicting neonatal IVH. 相似文献
4.
5.
6.
Acute respiratory distress during Caesarean section under spinal anaesthesia A probable case of anaphylactoid reaction to Syntocinon 总被引:2,自引:0,他引:2
A case of life-threatening respiratory distress during a Caesarean section under spinal anaesthesia is reported. Possible causes of the event including anaphylactoid reactions and the methods of their diagnosis are discussed. The most likely cause of the episode was felt to be an anaphylactoid reaction to Syntocinon. 相似文献
7.
Abstract: This paper dicusses the use of esophageal dilatation with a Rigiflex TTS balloon. This method was used 45 times on 11 patients affected by anastomotic or a severe grade peptic esophageal stenosis. Fluoroscopic guidance was used in 36 procedures (80%) without effecting the mean duration of the treatment (12 minutes). The results were considered satisfactory when these goals had been achieved: a) dilatation of the stenosis over 15 mm; b) a dysphagia free-time of more than 6 months. A satisfactory result was achieved in 10 patients (90.9%), without deaths and major complications. 5 patients received 1 dilatation and the other 5 needed, 3-3-4-7–11 procedures respectively to obtain a satisfactory result. On these basis we consider that its great efficacy, security and tolerability depend on the following characteristics of the Rigiflex TTS balloon: 1) “radial” dilatation; 2) the possibility of introducing the balloon through the operative channel of the fiberscope; 3) direct visualization of the stenosis during dilatation. The following disadvantages with this method are: the absence of a tactile sensation of dilatation and the elevated cost of the instrument. We conclude that the Rigiflex TTS balloon is an important alternative to guide-wire techniques, especially for the treatment of severe esophageal strictures. 相似文献
8.
妊娠肝内胆汁淤积症患者血清一氧化氮和内皮素的变化及意义 总被引:2,自引:0,他引:2
目的:探讨妊娠肝内胆汁淤积症(ICP)患者外周静脉血清、新生儿脐静脉血清中一氧化氮(NO)、内皮素(ET)、丙二醛(MDA)和超氧化物歧化酶(SOD)含量的变化及在ICP发病中的作用。方法:以ICP组28例为研究组,测定其外周静脉血清及新生儿脐静脉血清中的NO、ET、MDA和SOD,以年龄相近的24例正常孕妇作为对照组。结果:ICP患者的MDA和ET含量较正常晚期妊娠显著增高(P<0.01),ICP患者的NO和SOD含量与对照组相比无显著性差异(P>0.05)。母血清中NO、ET、MDA含量均较新生儿脐静脉血清中的含量高,差异有显著性(P<0.01)。结论:妊娠期体内氧化和抗氧化失衡及ET水平的增高可能与ICP的发生、发展有关。 相似文献
9.
C V Smith J C Anderson A Matamoros W F Rayburn 《Journal of ultrasound in medicine》1992,11(9):465-467
Transvaginal ultrasonography has been proposed as a reliable method of assessing dimensions of the cervix. The purpose of the current investigation was to establish normative data for cervical width and length during pregnancy. This information may be helpful in predicting patients at risk for preterm birth. A transvaginal 5 or 7.5 MHz transducer was used on 132 consecutive low-risk pregnant women undergoing evaluation for gestational dating purposes. Even in cases of patient obesity or an empty bladder, high resolution was possible and permitted cervical measurement in all but one case. The external cervical width at the vaginal fornices was found to increase with advancing gestation (R = 0.512, P < 0.005). The cervical length from internal os to external os was found not to change with advancing gestation (R = 0.11, P = 0.30). Using these normative data, investigation is recommended to determine whether measuring cervical width and length is useful in predicting preterm labor and delivery. 相似文献
10.