全文获取类型
收费全文 | 2257篇 |
免费 | 297篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 69篇 |
妇产科学 | 33篇 |
基础医学 | 298篇 |
口腔科学 | 27篇 |
临床医学 | 237篇 |
内科学 | 376篇 |
皮肤病学 | 78篇 |
神经病学 | 130篇 |
特种医学 | 185篇 |
外科学 | 298篇 |
综合类 | 60篇 |
预防医学 | 329篇 |
眼科学 | 65篇 |
药学 | 252篇 |
中国医学 | 6篇 |
肿瘤学 | 101篇 |
出版年
2022年 | 14篇 |
2021年 | 30篇 |
2020年 | 18篇 |
2019年 | 39篇 |
2018年 | 27篇 |
2017年 | 26篇 |
2016年 | 40篇 |
2015年 | 73篇 |
2014年 | 51篇 |
2013年 | 66篇 |
2012年 | 101篇 |
2011年 | 99篇 |
2010年 | 79篇 |
2009年 | 81篇 |
2008年 | 80篇 |
2007年 | 81篇 |
2006年 | 85篇 |
2005年 | 114篇 |
2004年 | 102篇 |
2003年 | 112篇 |
2002年 | 87篇 |
2001年 | 58篇 |
2000年 | 71篇 |
1999年 | 57篇 |
1998年 | 38篇 |
1997年 | 51篇 |
1996年 | 46篇 |
1995年 | 47篇 |
1994年 | 41篇 |
1993年 | 34篇 |
1992年 | 32篇 |
1991年 | 46篇 |
1990年 | 39篇 |
1989年 | 62篇 |
1988年 | 45篇 |
1987年 | 39篇 |
1986年 | 33篇 |
1985年 | 41篇 |
1984年 | 38篇 |
1983年 | 27篇 |
1982年 | 19篇 |
1981年 | 22篇 |
1980年 | 19篇 |
1979年 | 28篇 |
1978年 | 26篇 |
1977年 | 18篇 |
1976年 | 25篇 |
1973年 | 13篇 |
1971年 | 14篇 |
1970年 | 18篇 |
排序方式: 共有2564条查询结果,搜索用时 15 毫秒
11.
12.
D J Goldstein S L Mullis E S Delphin N el-Amir R C Ashton Jr M Gardocki D A Jordan K A Catanese H R Levin E A Rose et al. 《Annals of surgery》1995,222(2):203-207
OBJECTIVE: The authors describe their experience with left ventricular assist-device (LVAD) recipients undergoing noncardiac surgery and delineate surgical, anesthetic, and logistic factors important in the successful intraoperative management of these patients. SUMMARY BACKGROUND DATA: Left ventricular assist-devices have become part of the armamentarium in the treatment of end-stage heart failure. As the numbers of patients chronically supported with long-term implantable devices grows, general surgical problems that are commonly seen in other hospitalized patients are becoming manifest. Of particular interest is the intraoperative management of patients undergoing elective noncardiac surgical procedures. METHODS: The anesthesia records and clinical charts were reviewed for eight ventricular assist-device recipients undergoing general surgical procedures between August 1, 1990 and August 31, 1994. RESULTS: A total of 12 procedures were performed in 6 men and 2 women averaging 52.7 years of age. Mean time elapsed from device implantation to operation was 68 +/- 35 days. Conventional inhalational and intravenous anesthetic techniques were well tolerated in these patients undergoing diverse surgical procedures. No perioperative mortality was observed. Five of eight patients went on to successful cardiac transplantation. CONCLUSIONS: Hemodynamic recovery after LVAD insertion has defined a new group of patients who develop noncardiac surgical problems often seen in other critically ill patients. Recognition of the unique potential problems that the LVAD recipient may encounter in the perioperative period--in particular patient positioning, device limitations, and fluid and inotropic management--will ensure an optimal surgical outcome for LVAD recipients undergoing noncardiac surgery. 相似文献
13.
14.
M R Ashton A D Postle D E Smith M A Hall 《Archives of disease in childhood. Fetal and neonatal edition》1994,71(2):F114-F117
Objectives - To determine whether dexamethasone `matures' the phosphatidylcholine (PC) composition of broncheoalveolar fluid in infants at high risk of neonatal chronic lung disease (CLD), either by increasing the proportion of dipalmitoylphosphatidylcholine (DPPC), expressed as a percentage of total PC (%DPPC), or by increasing the ratio of DPPC to palmitoyloleoylphosphatidylcholine (DPPC:POPC ratio). 相似文献
15.
Hausegger KA; Cragg AH; Lammer J; Lafer M; Fluckiger F; Klein GE; Sternthal MH; Pilger E 《Radiology》1994,190(1):199
16.
17.
Wrist ratio correlation with carpal tunnel syndrome in industry 总被引:1,自引:0,他引:1
C Gordon E W Johnson P F Gatens J J Ashton 《American journal of physical medicine & rehabilitation / Association of Academic Physiatrists》1988,67(6):270-272
Employees from a large midwestern automobile manufacturing plant completed a preemployment evaluation which included a personal and family history, physical examination, and wrist ratio determinations obtained by dividing the anteroposterior diameter by the mediolateral diameter of the wrist. Over a 3-year period, 80 of these employees who developed symptoms compatible with carpal tunnel syndrome within 4-12 months of employment were entered into the study and were evaluated with standard electrodiagnostic techniques. The symptoms included nocturnal hand pain, paresthesia and weak grasp. Thirty-nine of the 80 employees had wrist ratios equal to or greater than 0.70. Twenty-four percent of the employees with wrist ratios less than 0.70 had abnormal electrodiagnostic studies compared with 74% of employees with wrist ratios greater than or equal to 0.70. Regression analysis performed on the data revealed a significant positive correlation between distal median motor latency and wrist ratio (P = 0.001). The study suggests the practical value of wrist ratio determination in job placement. 相似文献
18.
C. H. Ashton E. F. Marshall F. Hassanyeh V. R. Marsh S. Wright-Honari 《Acta psychiatrica Scandinavica》1994,90(5):316-323
Clinical, electroencephalographic and biochemical variables were measured in 40 patients who attempted suicide and 27 age-matched controls. Patients had significantly higher scores for depression, hopelessness, neuroticism and psychoticism and lower scores for extraversion than controls. They also had significantly lower contingent negative variation (CNV), higher postimperative negative variation and lower whole blood serotonin values than controls. Within the patient group, vulnerability to parasuicide, as determined by previous or repeated acts of deliberate self-harm, was associated with higher scores for hopelessness and suicide intent, lower scores for extraversion and decreased CNV. Factor analysis revealed significant correlations between psychological variables and auditory evoked potential amplitudes for the vulnerable group. A profile of variables associated with increased risk of self-harm in patients presenting with attempted suicide is proposed from our data. 相似文献
19.
Pain intensity measurement in chronic low back pain. 总被引:1,自引:0,他引:1
This study investigated the psychometric properties of eight pain intensity measures used with chronic low back pain patients. All measures were similar in terms of scale distribution and rates of incorrect responses, with all scales apart from the Pain Rating Index significantly correlated. Principal axis factoring of data from 92 patients indicated the presence of one general factor on which all pain intensity measures except the Pain Rating Index loaded. The 101-point Numeric Rating Scale and the Box Scale had the strongest relationship, with loadings of 0.90. The Numeric Rating Scale and the Box Scale appear to be the scales of choice for the measurement of pain intensity in the low back pain patient. 相似文献
20.
Subconjunctival sustained release 5-fluorouracil. 总被引:1,自引:0,他引:1
D L Blandford T J Smith J D Brown P A Pearson P Ashton 《Investigative ophthalmology & visual science》1992,33(12):3430-3435
The authors have developed a sustained release device for 5-fluorouracil (5-FU) made up of a 12 mg pellet of drug coated in a mixture of permeable and impermeable polymers. When implanted subconjunctivally in rabbits, these devices released 5-FU at approximately 1 mg/d for over 10 days. Devices were implanted into four cynomolgus monkey eyes after posterior lip sclerotomy. One eye (treatment) received a device that contained 12 mg 5-FU and the other eye (control) received a placebo device that contained no drug. In control eyes, intraocular pressures returned to normal within 1 wk. In treatment eyes, pressures remained significantly lower throughout the experimental period (3 mo). There was no indication of impaired wound healing, corneal toxicity, inflammation, or damage to the ciliary body in rabbits or monkeys. 相似文献