全文获取类型
收费全文 | 1360篇 |
免费 | 91篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 116篇 |
妇产科学 | 11篇 |
基础医学 | 46篇 |
口腔科学 | 7篇 |
临床医学 | 417篇 |
内科学 | 552篇 |
神经病学 | 128篇 |
特种医学 | 11篇 |
外科学 | 20篇 |
综合类 | 96篇 |
预防医学 | 19篇 |
眼科学 | 1篇 |
药学 | 27篇 |
中国医学 | 15篇 |
肿瘤学 | 2篇 |
出版年
2024年 | 4篇 |
2023年 | 17篇 |
2022年 | 21篇 |
2021年 | 40篇 |
2020年 | 47篇 |
2019年 | 41篇 |
2018年 | 37篇 |
2017年 | 31篇 |
2016年 | 44篇 |
2015年 | 41篇 |
2014年 | 47篇 |
2013年 | 71篇 |
2012年 | 43篇 |
2011年 | 41篇 |
2010年 | 61篇 |
2009年 | 54篇 |
2008年 | 45篇 |
2007年 | 74篇 |
2006年 | 84篇 |
2005年 | 60篇 |
2004年 | 49篇 |
2003年 | 57篇 |
2002年 | 48篇 |
2001年 | 54篇 |
2000年 | 39篇 |
1999年 | 48篇 |
1998年 | 31篇 |
1997年 | 59篇 |
1996年 | 26篇 |
1995年 | 22篇 |
1994年 | 13篇 |
1993年 | 12篇 |
1992年 | 17篇 |
1991年 | 12篇 |
1990年 | 7篇 |
1989年 | 16篇 |
1988年 | 9篇 |
1987年 | 5篇 |
1986年 | 7篇 |
1985年 | 9篇 |
1984年 | 11篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1971年 | 1篇 |
排序方式: 共有1471条查询结果,搜索用时 15 毫秒
1.
2.
3.
��ͯѪ��������������ϳ������������ѧ���� 总被引:3,自引:1,他引:2
目的对儿童血管迷走性晕厥(VVS)的传统诊断程序与新诊断程序进行卫生经济学评价。方法采用回顾分析方法,根据不同的诊断程序(即传统诊断程序和新诊断程序),将1995年1月至2005年5月北京大学第一医院儿科确诊的81例VVS患儿分为2组,分别计算其就诊费用、检查费用、住院日、确诊日等,运用经济学最小成本分析法进行评价。结果新诊断程序的平均就诊费用比传统诊断程序少耗费1668.80元;新诊断程序的平均就诊检查费用比传统诊断程序少耗费1413.30元。结论新诊断程序对确诊儿童血管迷走性晕厥具有良好的经济学效益,值得临床推广。 相似文献
4.
We report on 4 children who experienced a syncopal episode while being treated with guanfacine without any other evident cause. Syncope appears to be an uncommon side effect of guanfacine and is probably due to drug-induced hypotension or bradycardia. 相似文献
5.
V K Marrison S W Parry 《Europace : European pacing, arrhythmias, and cardiac electrophysiology》2007,9(9):835-836
Supine loss of consciousness is a relatively rare occurrence prompting investigations for underlying causes as diverse as cardiac arrhythmia, hypoglycaemia and nocturnal epilepsy. Neurally mediated syncope is rarely implicated as the cause of symptoms in supine loss of consciousness because of the absence of orthostatic stress and gravitational relative preservation of cerebral perfusion, but we report here on a case of recurrent, atypical and troublesome vasovagal syncope occurring at night while supine. Diagnosis aided by head-up tilt table testing and conservative management brought about complete resolution of symptoms. 相似文献
6.
G. Famularo F. M. Corsi G. Minisola C. De Simone G. C. Nicotra 《European journal of neurology》2007,14(8):940-943
There is no report of patients in whom pathological laughter, a rare condition characterized by uncontrollable episodes of laughter usually triggered by unrelated stimuli, was ever closely associated with a loss of consciousness overtly linked with the onset of such uncontrollable laughter, also referred to as a gelastic syncope. A 53-year-old man presented with a 4-month history of syncope following intense and uncoordinated laughter. Physical and neurological examination was normal and the patient had no other typical cerebellar signs. We found a mass in the cerebellar vermis abutting the floor of the fourth ventricle, which upon histological examination after surgery proved to be an ependymoma. We emphasize that pathological laughter and gelastic syncope could represent unique and sole features of a cerebellar disorder. 相似文献
7.
CLINICAL IMPLICATIONS OF ELECTROPHYSIOLOGY STUDY FINDINGS IN PATIENTS WITH CHRONIC BIFASCICULAR BLOCK AND SYNCOPE 总被引:2,自引:0,他引:2
NICHOLAS TWIDALE BRONTE F. AYRES WILLIAM r. HEDDLE REW M. TONKIN 《Internal medicine journal》1988,18(7):841-847
Electrophysiology study was performed in 93 patients with bifascicular block and unexplained syncope. Clinical evidence of organic heart disease was present in 33 (35%). Electrophysiological abnormalities were detected in 45 patients (48%). Of these, 36 had distal conduction disease, including 28 with an HV interval > 55 ms (mean 76.4 ms), and eight who developed infraHisian block following either intravenous procainamide (four) or atrial pacing (four). Sick sinus syndrome was evident in six patients and a further two had carotid sinus hypersensitivity. Sustained monomorphic ventricular tachycardia (VT) was induced in only three patients, two of whom also had prolonged HV interval. Among the 93 patients, 45 had therapy which was guided by positive findings at electrophysiology study (Group 1). Of these, 42 received permanent pacemakers, two were treated with combined permanent pacing and antiarrhythmic drug therapy, and one was treated with antiarrhythmic drug alone. In addition, eight patients without electrophysiologic abnormalities were treated empirically by pacing (Group 2). Finally, 40 patients without electrophysiologic abnormalities received no specific therapy (group 3). At a mean follow-up of 39 months (range two-125 months), recurrence of syncope had occurred in 4% of Group 1 patients, and 25% of Group 3 patients (p < 0.05). No patient in Group 2 had had recurrence. Total mortality was 40%, including 47% of patients in Group 1, 25% of Group 2, and 35% of Group 3. Death was sudden in seven patients. We concluded that among patients with bifascicular block and syncope, therapy directed by findings at electrophysiology study was associated with symptomatic improvement, but mortality was not significantly influenced. Patients with no electrophysiological abnormality have a high recurrence of syncope which may relate either to undetected bradyarrhythmia or ventricular tachycardia. These results highlight some limitations in current assessment, including, for programmed ventricular stimulation, significant differences in both stimulation protocols and the definition of ventricular tachycardia. 相似文献
8.
Anna Kostopoulou Eftihia Sbarouni Efthimios G Livanis George N Theodorakis Dimitrios Kremastinos 《Europace : European pacing, arrhythmias, and cardiac electrophysiology》2004,6(3):205-208
We describe the case of a recipient of an implantable cardioverter defibrillator with multiple syncopal episodes due both to superior vena cava obstruction and electrical instability. These complications occurred in the presence of two transvenous implantable cardioverter defibrillator leads. The patient has been managed conservatively with anticoagulants and new antiarrhythmic drugs with improvement in both his clinical problems. 相似文献
9.
During orthostatic hypotension we evaluated whether presyncopal symptoms relate to a reduced brain oxygenation. Nine subjects performed 50° head-up tilt for 1 h and eight subjects were followed during 2 h of supine rest and during 1 h of 10° head-down tilt. Cerebral perfusion was assessed by transcranial Doppler determined middle cerebral artery blood velocity (MCA vmean), while brain blood oxygenation was assessed by near-infrared spectrophotometry determined concentration changes for oxygenated (ΔHbO2) and deoxygenated haemoglobin and brain cell oxygenation by the oxidized cytochrome c concentration (ΔCytO2). During head-up tilt, six volunteers developed presyncopal symptoms and mean arterial pressure (88 (78–103) to 68 (57–79) mmHg; median and range), heart rate (96 (72–111) to 65 (50–107) beats min?1), MCA vmean (59 (51–82) to 41 (29–56) cm s?1), ΔHbO2 (by ?5.3 (?3.0 to ?14.8) μmol l?1) and ΔCytO2 were reduced (by ?0.2 (?0.1 to ?0.4) μmol l?1; P < 0.05). During tilt down the cardiovascular variables recovered immediately and ΔHbO2 increased to 2.2 (?0.9–12.0) mmol L?1 above the resting value and also ΔCytO2 recovered. In the nonsyncopal head-up tilted subjects as in the controls, blood pressure, heart rate, MCA vmean and brain oxygenation indices remained stable. The results suggest that during orthostasis, presyncopal symptoms relate not only to cerebral hypoperfusion but also to reduced brain oxygenation. 相似文献
10.
Myer S. Leonard 《Australian dental journal》1995,40(3):159-163
This article reviews an eclectic collection of problems. There is no particular reason why any one of them was chosen other than that they are more likely to occur in the course of practice than some other complications such as an oro-antral fistula or trauma to the lingual nerve or tissue emphysema. These latter and some other predicaments were discussed in the course of the talks given by the author at the 28th Australian Dental Congress in March 1995. The problems discussed in this paper are:
- 1 1. Dentoalveolar abscess anaesthesia.
- 2 2. Inability to obtain effective anaesthesia.
- 2 1. Post-extraction haemorrhage.
- 2 2. Syncope.
- 3 3. Postoperative infection.