全文获取类型
收费全文 | 10293篇 |
免费 | 548篇 |
国内免费 | 351篇 |
专业分类
耳鼻咽喉 | 307篇 |
儿科学 | 400篇 |
妇产科学 | 167篇 |
基础医学 | 183篇 |
口腔科学 | 111篇 |
临床医学 | 1210篇 |
内科学 | 1705篇 |
皮肤病学 | 29篇 |
神经病学 | 354篇 |
特种医学 | 782篇 |
外国民族医学 | 1篇 |
外科学 | 3507篇 |
综合类 | 1270篇 |
预防医学 | 209篇 |
眼科学 | 84篇 |
药学 | 369篇 |
8篇 | |
中国医学 | 170篇 |
肿瘤学 | 326篇 |
出版年
2024年 | 16篇 |
2023年 | 172篇 |
2022年 | 390篇 |
2021年 | 442篇 |
2020年 | 397篇 |
2019年 | 348篇 |
2018年 | 313篇 |
2017年 | 294篇 |
2016年 | 340篇 |
2015年 | 398篇 |
2014年 | 786篇 |
2013年 | 615篇 |
2012年 | 508篇 |
2011年 | 613篇 |
2010年 | 491篇 |
2009年 | 541篇 |
2008年 | 546篇 |
2007年 | 528篇 |
2006年 | 466篇 |
2005年 | 400篇 |
2004年 | 349篇 |
2003年 | 256篇 |
2002年 | 268篇 |
2001年 | 235篇 |
2000年 | 150篇 |
1999年 | 138篇 |
1998年 | 126篇 |
1997年 | 107篇 |
1996年 | 126篇 |
1995年 | 89篇 |
1994年 | 69篇 |
1993年 | 85篇 |
1992年 | 68篇 |
1991年 | 66篇 |
1990年 | 49篇 |
1989年 | 48篇 |
1988年 | 38篇 |
1987年 | 41篇 |
1986年 | 38篇 |
1985年 | 42篇 |
1984年 | 33篇 |
1983年 | 16篇 |
1982年 | 34篇 |
1981年 | 16篇 |
1980年 | 19篇 |
1979年 | 20篇 |
1978年 | 28篇 |
1977年 | 18篇 |
1976年 | 6篇 |
1975年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
A 60-year-old Japanese woman was diagnosed at autopsy as having had hereditary hemorrhagic telangiectasia (HHT) associated with systemic hemangiomas. In her repoduction period, premenstrual epistaxis frequently occurred. At the age of 60, the patient died of malignant lymphoma. At autopsy, multiple telangiectatic spots were noted on the face, limbs and trunk. The paraaortic lymph nodes, which were enlarged and irregularly conglomerated, were histologically diagnosed as malignant lymphoma of the diffuse large cell type. Submucosal telangiectatic lesions were found in the gastrointestinal system from the oral cavity to the rectum. Cavernous hemangiomas were present in various visceral organs including the liver, spleen, small and large intestines, rectum, appendix, uterus, and jejunal and colonic mesenteries. There was an arteriovenous fistula in the left lung. Examination of her family pedigree showed that the patient had an autosomal dominant trait of inheritance. The pathogenesis of the systemic visceral hemangiomas observed in this patient was considered to be similar to that of hamartoma. 相似文献
92.
Mansy HA Hoxie SJ Patel NH Sandler RH 《Medical & biological engineering & computing》2005,43(1):56-62
Vascular access for renal dialysis is a lifeline for about 120 000 individuals in the United States. Stethoscope auscultation
of vascular sounds has some utility in the assessment of access patency, yet can be highly skill-dependent. The objective
of the study was to identify acoustic parameters that are related to changes in vascular access patency. The underlying hypothesis
is that stenoses of haemodialysis access vessels or grafts cause vascular sound changes that are detectable using computerised
data acquisition and analysis. Eleven patients participated in the study. Their vascular sounds were recorded before and after
angiography, which was accompanied by angioplasty in most patients. The sounds were acquired using two electronic stethoscopes
and then digitised and analysed on a personal computer. Vessel stenosis changes were found to be associated with changes in
acoustic amplitude and/or spectral energy distribution. Certain acoustic parameters correlated well (correlation coefficient=0.98,
p<0.0001) with the change in the degree of stenosis, suggesting that stenosis severity may be predictable from these parameters.
Parameters also appeared to be sensitive to modest diameter changes (>20%), (p<0.005, Wilcoxon rank sum test). These results
suggest that computerised analysis of vascular sounds may be useful in vessel patency surveillance. Further testing using
longitudinal studies may be warranted. 相似文献
93.
目的探讨B超及多排螺旋CT血管造影(CTA)在诊断颈动脉海绵窦瘘中的应用价值。方法分析23例颈动脉海绵窦瘘病例。对受检者行B型超声及颅脑CTA检查,采用容积再现(VR)、最大密度投影(MIP)、多平面重建(MPR)技术处理图像。结果超声可发现增粗的眼上静脉与脉搏同步搏动,并能检测血流频谱,CT检查发现23例均海绵窦扩大.动脉期眼上静脉显影并扩张,8例动脉期大脑中静脉显影并扩张。其中一例同时合并左侧大脑中动脉动脉瘤。结论B型超声及多排螺旋CT血管造影对诊断颈内动脉海绵窦瘘有重要的应用价值。 相似文献
94.
《European journal of medical genetics》2020,63(4):103802
Mabry syndrome is a glycophosphatidylinositol (GPI) deficiency characterized by intellectual disability, distinctive facial features, intractable seizures, and hyperphosphatasia. We expand the phenotypic spectrum of inherited GPI deficiencies with novel bi-allelic phosphatidylinositol glycan anchor biosynthesis class O (PIGO) variants in a neonate who presented with intractable epilepsy and complex gastrointestinal and urogenital malformations. 相似文献
95.
Zampollo A. Costanzo R. Locatelli F. 《The Italian Journal of Neurological Sciences》1985,6(3):323-327
The aim of this study was to investigate the possible influence of arteriovenous fistula (AVF) on nerve conduction velocity in patients on intermittent hemodialysis and its relevance to the pathogenesis of carpal tunnel syndrome (CTS). The data on 22 patients showed no statistically significant differences in the electrographic parameters considered. This suggests that AVF by the end-to-end method plays no significant part in the alteration of nerve conduction. Possibly radial steal phenomena, which occur with other types of AVF, are at least partly responsible for the reported cases of CTS.
Sommario Scopo di questo studio è stato indagare l'eventuale influenza della fistola arterovenosa (FAV) sulla velocità di conduzione nervosa in pazienti in trattamento emodialitico periodico, per le sue pssibili implicazioni nella patogenesi della sindrome del tunnel carpale (CTS). Vengono presentati i dati relativi a 22 pazienti. I risultati non hanno evidenziato differenze statisticamente significative dei parametri elettrografici considerati.Pertanto i nostri dati suggeriscono che la FAV (eseguita secondo la tecnica termino-terminale) non riveste un ruolo significativo nell'alterazione della conduzione nervosa. È possibile che fenomeni di furto nel territorio dell'arteria radiale, che si verificano con FAV eseguite con altra modalità, siano, almeno in parte, responsabili dei casi di CTS segnalati nella letteratura al riguardo.相似文献
96.
PEEP impedes thoracic duct drainage (LF). This can be counteracted by a thoracic duct fistula. Consequently, lung oedema (LOE) should develop during PEEP more slowly with LF at atmospheric pressure (LFAP) than with LF against jugular venous pressure (LFJVP). In 12 anaesthetized dogs LOE was produced by Ringer's solution i.v. (2.5 ml/min per kg) for 6 h during PEEP (10 mmHg) with either LFAP or LFJVP. Ringer's+PEEP greatly increased aortic, pulmonary artery and wedge pressures, JVP, and cardiac output. Colloid osmotic pressures in plasma and lymph were drastically reduced, pulmonary effective filtration pressure (EFP) rose by about 20 mmHg. LFJVP increased 7-fold, LFAP about 19-fold, the respective loss of plasma proteins was 1.83 and 1.06 g/kg during 6 h. Thermal-dye extravascular lung water showed an increment of 68 with LFJVP versus 43 l/h/g per mmHg with LFAP. Final lung water content was at any EFP (12.8–31.9 mmHg) lower with LFAP than with LFJVP amounting 512 with LFJVP versus 377 l/g/per mmHg with LFAP. LFAP decreased the development of LOE during PEEP by bypassing the PEEP-induced high JVP and thus facilitating the removal of interstitial fluid. It is hypothesized that a thoracic duct fistula might aid the treatment of patients with LOE due to ARDS and therefore requiring high levels of PEEP. 相似文献
97.
电视腹腔镜胆囊切除术胆漏的预防和处理 总被引:1,自引:0,他引:1
目的:降低电视腹腔镜胆囊切除术(LC)胆漏的发生率,提高治愈率,防止胆漏对病人的危害。促进愈合。方法:分析1991年12月-1998年12月我院开展LC4000例,出现胆漏29例的原因,用线扎代替钛夹处理胆囊管和胆囊血管,简化了胆囊三角的过多解剖;术中针对性的置放引流管防止胆汁性腹膜炎;特殊情况的胆囊作特殊处理。结果:拓宽了LC的适应范围,大大减少了手术中胆管的损伤、出血。发生胆漏的病人中有41%(12/29)困术中置管引流而未出现胆汁性腹膜炎,并很快康复。术后B超动态观察胆囊窝积液情况,及时引流,胆漏多能自愈。结论:熟练的操作技巧能避免手术损伤,认真线扎处理胆囊管和胆囊血管并针对性置放引流管,能有效防止胆漏和胆汁性腹膜炎;及时发现、及时处理是减少胆漏危害的关键。 相似文献
98.
心导管术后的外周血管并发症及其处理 总被引:8,自引:0,他引:8
目的 探讨心导管术后的外周血管并发症的发生原因、临床表现和处理方法。方法 对心导管术后有外周血管并发症的患者的临床资料进行分析。结果 本院1996年1月-2000年1月共完成各类心导管术508例,发现外周血管并发症28例(5.5%),其中局部血肿22例,假性动脉瘤1例,动脉静瘘1例,静脉血栓形成2例,动脉血栓形成1例,股神经功能障碍1例。所有并发症经内科保守治疗后均好转。结论 心导管术后外周血管并发症不可忽视。但只要及时处理。绝大多数预后良好。 相似文献
99.
目的 探讨胃-肠瘘引起腹泻的临床特点。方法 从1988年1月-1998年12月我院消化内科住院患者2885例中筛选出以腹泻为主要临床表现的所有病例,其中胃-肠瘘为病因的5例,总结分析其各方面的临床资料。结果 5例患者均有毕II式胃大部切除术病史,腹泻特点均为吸收不良性腹泻表现,予去麦胶饮食及抗感染治疗,疗效欠佳。就诊时均有明显的低蛋白血症。均能通过消化道钡餐造影明确诊断,胃镜诊断率仅40%。二次手术治疗,症状均得到缓解。结论 在诊治腹泻患者,特别是有胃大部切除病史的患者时,要考虑到胃-肠瘘的可能。 相似文献
100.
Krzysztof Letachowicz Klaudia Bardowska Tomasz Krlicki Dorota Kamiska Mirosaw Banasik Karolina Zajdel Oktawia Mazanowska Katarzyna Madziarska Dariusz Janczak Magdalena Krajewska 《Renal failure》2021,43(1):113
BackgroundArteriovenous fistulae (AVFs) may remain patent after kidney transplantation (KTx), contributing to maladaptive cardiac remodeling. The flow in AVFs is associated with the diameter of its vessels and thus with the AVF location. The main objective of this study is to assess the influence of AVF location and its patency on the self-reported quality of life (QOL) of kidney transplant recipients (KTRs) with past history of hemodialysis.MethodsTo gain clinical data, during a scheduled visit, 353 KTRs were asked to fill out an anonymous questionnaire. From this group, 284 respondents were found eligible for analysis. The outcome was defined as prevalence of symptoms and health status, measured with the Left Ventricular Dysfunction-36 (LVD-36) Questionnaire in symptomatic patients.ResultsThe hemodialysis patients (n = 243) were divided into two groups according to AVF location, i.e., DAVF – distally located AVF – (n = 174) and PAVF – proximally located AVF – (n = 69). The proportion of patients with heart failure (HF) was higher in PAVF group (24% vs. 12%, p = 0.0482). In the multivariable regression, PAVF, serum creatinine levels, and the presence of HF or coronary artery disease (CAD) remained independent predictors of lower functional capacity. Among patients with heart disease, the presence of active AVF was independently associated with worse functional outcome (higher LVD-36 scores).ConclusionsThe influence of persistent PAVF in KTRs seems to be unfavorable, especially when coexisting with CAD or HF. Abbreviations: AVF arteriovenous fistula; BMI body mass index; CAD coronary artery disease; D-AVF distally-located arteriovenous fistula; EC exercise capacity; HD hemodialysis; HF heart failure; KTx kidney transplantation; KTR kidney transplant recipient; LVD-36 Left Ventricle Disfunction – 36; LVEF left ventricle ejection fraction; LVH left ventricle hypertrophy; NYHA New York Heart Association; P-AVF proximally located arteriovenous fistula; PD peritoneal dialysis; PRO patient-reported outcomes; QOL quality of life. 相似文献