全文获取类型
收费全文 | 11943篇 |
免费 | 942篇 |
国内免费 | 431篇 |
专业分类
耳鼻咽喉 | 41篇 |
儿科学 | 197篇 |
妇产科学 | 379篇 |
基础医学 | 380篇 |
口腔科学 | 73篇 |
临床医学 | 4673篇 |
内科学 | 1764篇 |
皮肤病学 | 80篇 |
神经病学 | 312篇 |
特种医学 | 653篇 |
外国民族医学 | 3篇 |
外科学 | 1417篇 |
综合类 | 2032篇 |
预防医学 | 300篇 |
眼科学 | 162篇 |
药学 | 364篇 |
4篇 | |
中国医学 | 60篇 |
肿瘤学 | 422篇 |
出版年
2024年 | 86篇 |
2023年 | 314篇 |
2022年 | 368篇 |
2021年 | 506篇 |
2020年 | 511篇 |
2019年 | 566篇 |
2018年 | 352篇 |
2017年 | 370篇 |
2016年 | 338篇 |
2015年 | 380篇 |
2014年 | 612篇 |
2013年 | 600篇 |
2012年 | 504篇 |
2011年 | 725篇 |
2010年 | 611篇 |
2009年 | 538篇 |
2008年 | 561篇 |
2007年 | 609篇 |
2006年 | 724篇 |
2005年 | 598篇 |
2004年 | 529篇 |
2003年 | 494篇 |
2002年 | 439篇 |
2001年 | 371篇 |
2000年 | 215篇 |
1999年 | 212篇 |
1998年 | 275篇 |
1997年 | 169篇 |
1996年 | 141篇 |
1995年 | 121篇 |
1994年 | 96篇 |
1993年 | 56篇 |
1992年 | 59篇 |
1991年 | 50篇 |
1990年 | 54篇 |
1989年 | 33篇 |
1988年 | 24篇 |
1987年 | 16篇 |
1986年 | 13篇 |
1985年 | 6篇 |
1984年 | 15篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1975年 | 4篇 |
1973年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
原发性高血压与动脉粥样硬化的关系已为人们所熟知,本应用超声显像技术对80例原发性高血压患腹主动脉检查结果分析认为具有重要的临床意义。 相似文献
992.
目的 探讨常规检查与血管性认知功能障碍(VCI)的相关性。方法 选取2015 年1 月—2015 年
12 月在锦州医科大学附属第一医院神经内科就诊的缺血性脑卒中患者239 例,将患者分为正常组、血管性
痴呆组及血管性认知功能障碍非痴呆型组,对患者的一般资料、伴随疾病、实验室检查、颈动脉彩超及神
经心理学结果进行评估和分析。结果 3 组患者年龄和文化程度比较,差异有统计学意义(P <0.05);3 组
患者慢性阻塞性肺疾病、高脂血症、高血压、低密度脂蛋白、血糖、总胆固醇、白蛋白及谷草转氨酶比较,
差异有统计学意义(P <0.05);正常组在神经心理学评估MoCA 和MMSE 得分上高于其他两组(P <0.05)。
结论 常规检查与VCI 具有相关性,可用于早期筛查和协助诊断VCI。 相似文献
993.
MARK D. CHOUINARD M.D. LUIZ PINHEIRO M.D. NAVIN C. NANDA M.D. RAJAT S. SANYAL M.D. 《Echocardiography (Mount Kisco, N.Y.)》1991,8(3):397-403
For the first time, the feasibility of using transgastric ultrasonography to examine the abdominal vasculature and organs has been demonstrated. An illustrative case report details how this approach was utilized in a patient following abdominal aortic aneurysm resection, in whom surface ultrasonography was not feasible. The diagnostic potential of this new approach is discussed. Possible modifications to improve the technique and to facilitate the examination in a wider range of patients are also suggested. Further studies are needed to better define the technique and role of transgastric ultrasonography in the evaluation of the abdominal aorta and its branches and other abdominal structures. (ECHOCARDIOGRAPHY, Volume 8, May 1991) 相似文献
994.
995.
Konstantinos Vadikolias MD PhD John Heliopoulos MD PhD Aspasia Serdari MD Chrissanthi M. Vadikolia MD Charitomeni Piperidou MD PhD 《Journal of clinical ultrasound : JCU》2009,37(4):221-222
We present the sonographic finding of flapping of the dissected intima inside the carotid artery in a 48‐year‐old man who suffered an acute stroke after vigorous use of a jackhammer. The dissected intima was seen to flap inside the lumen regularly and in synchrony with the vessel's pulse. There was no distal segmental stenosis. The extracranial blood flow velocities were within normal limits and transcranial Doppler examination did not reveal any velocity alteration. © 2009 Wiley Periodicals, Inc. J Clin Ultrasound 2009 相似文献
996.
Min Sun Kim MD Kyu Soon Kim MD Hyun Young Han MD Yoon Jung Kang MD Young Jin Choi MD Dong Wook Kang MD Joo Heon Kim MD 《Journal of clinical ultrasound : JCU》2009,37(7):420-423
Dermatofibrosarcoma protuberans (DFSP) is a rare cutaneous malignant tumor that usually occurs in the trunk, extremities, head, and neck but very rarely in the breast. Fibrosarcomatous transformation of DFSP is even rarer, with a higher risk of distant metastasis and poorer prognosis than DFSP. We report a case of such transformation in a DFSP in the breast. © 2009 Wiley Periodicals, Inc. J Clin Ultrasound, 2009 相似文献
997.
Yaron Zalel MD Simcha Yagel MD Reuven Achiron MD Zvi Kivilevich MD Liat Gindes MD 《Journal of ultrasound in medicine》2009,28(1):1-8
Objective. The purpose of this study was to establish the normality of the fetal vermis, ie, the time of appearance of the primary fissure, as well as its measurements between 18 and 26 weeks' gestation, using 3‐dimensional (3D) ultrasonography. Methods. A prospective cross‐sectional study of normal singleton pregnancies was conducted. Examinations were performed with high‐resolution transabdominal ultrasonography using the axial plane in 173 fetuses between 18 and 26 weeks' gestation. Postprocessing measurements of the fetal vermis were done with 4‐dimensional software using static volume contrast imaging and tomographic ultrasound imaging in the C‐plane. Detection of the primary fissure was evaluated in all cases, and the time of appearance was documented. Results. Adequate vermis measurements were obtained in 173 fetuses. Vermian length as a function of gestational age was expressed by regression equations, and the correlation coefficients were found to be highly statistically significant (P < .001). The normal mean ± 2 SD for each gestational week was defined. The primary fissure was observed at 24 weeks' gestation in all cases, at 22 weeks in 94% of cases, and as early as 18 weeks in 40%. Conclusions. This 3D study documents the appearance of the primary fissure and presents the normal range of vermian measurements, confirming normal development of the fetal vermis starting as early as 18 weeks' gestation. It also shows an easy method for visualizing the vermis with 3D ultrasonography at every gestational week regardless of fetal presentation. 相似文献
998.
目的 探究超声造影评估不同亚型功能性消化不良(FD)患者胃排空的价值。方法 选择四川
省人民医院东院收治的FD 患者188 例,分为上腹痛综合征(EPS)组和餐后不适综合征(PDS)组,同时选
择85 例健康体检者作为对照组。观察禁食、0、30、60、90 和120 min 时全胃腔容积(TGCV)、胃排空率
的变化。比较患者治疗前与治疗后120 min 的胃排空率差异。结果 两组FD 患者超声与核素扫描的120 min
平均胃排空率比较,差异无统计学意义(P >0.05)。3 组不同时间点的TGCV 和胃排空率比较,差异有统计
学意义(P <0.05),3 组患者TGCV 胃排空率比较,差异有统计学意义(P <0.05),3 组患者TGCV、胃排空
率变化趋势比较,差异有统计学意义(P <0.05)。EPS 组和PDS 组患者治疗前后的胃排空率比较,差异有统
计学意义(P <0.05)。结论 超声造影可以客观地评估FD 患者疗效,传统治疗方案对PDS 患者的疗效优于
EPS 患者。 相似文献
999.
A 5-year-old boy who had pneumonia was treated in a neighboring hospital. Ceftriaxone was administrated 2 g/day divided into
two equal intravenous doses. After 1 week of ceftriaxone therapy, the patient developed abdominal pain. In our hospital, an
abdominal sonogram showed a hyperechoic band with postacoustic shadow within the collapsed gallbladder. He was diagnosed with
ceftriaxone-associated biliary pseudolithiasis, and ceftriaxone therapy was ceased. On the 8th our hospital day, he again
complained of right abdominal pain after supper. A sonogram revealed high-amplitude echoes within the gallbladder neck and
common bile duct. Furthermore, bile duct dilatation was observed. He was managed conservatively, after which the symptoms
were resolved. On the 11th day, a sonogram showed only sludge within the gallbladder, and on the 13th day, he was discharged
from our hospital. It is important for sonographers to recognize the possible occurrence of biliary pseudolithiasis in ceftriaxone-treated
patients, especially when a high dose is used in children. 相似文献
1000.
目的采用兔急性弥漫性颅高压模型,研究经颅多普勒(TCD)参数与颅内压(ICP)和脑灌注压(CPP)的相关性。方法新西兰兔20只,随机分组:A组(对照组)8只,枕大池穿刺后不注入林格氏液;B组(实验组)12只,枕大池穿刺后逐步持续注入林格氏液。穿刺前、穿刺后每隔15 min监测ICP、HR、MAP、R及TCD各参数,并计算出CPP。结果A组各参数穿刺前后各时点比较无统计学差异。随着ICP的升高,B组TCD各参数与ICP、CPP有密切线性关系;TCD的变化发生在生命体征改变之前,更早于Cushing反应;在濒死前期,TCD出现一“反跳”现象,出现“反跳”的兔83.3%死亡。结论TCD的变化能较早地反映ICP和CPP的变化,同时ICP增高晚期出现的特征性“反跳”现象提示预后极差。 相似文献