全文获取类型
收费全文 | 150679篇 |
免费 | 32530篇 |
国内免费 | 2404篇 |
专业分类
耳鼻咽喉 | 5178篇 |
儿科学 | 5367篇 |
妇产科学 | 2386篇 |
基础医学 | 3313篇 |
口腔科学 | 1517篇 |
临床医学 | 26670篇 |
内科学 | 47601篇 |
皮肤病学 | 7453篇 |
神经病学 | 14809篇 |
特种医学 | 6393篇 |
外科学 | 41169篇 |
综合类 | 250篇 |
现状与发展 | 72篇 |
预防医学 | 6966篇 |
眼科学 | 3390篇 |
药学 | 1069篇 |
中国医学 | 8篇 |
肿瘤学 | 12002篇 |
出版年
2024年 | 685篇 |
2023年 | 4799篇 |
2022年 | 1205篇 |
2021年 | 3116篇 |
2020年 | 6040篇 |
2019年 | 2162篇 |
2018年 | 7394篇 |
2017年 | 7347篇 |
2016年 | 8433篇 |
2015年 | 8420篇 |
2014年 | 15480篇 |
2013年 | 15603篇 |
2012年 | 5452篇 |
2011年 | 5512篇 |
2010年 | 10347篇 |
2009年 | 14233篇 |
2008年 | 5822篇 |
2007年 | 4060篇 |
2006年 | 6508篇 |
2005年 | 3806篇 |
2004年 | 3044篇 |
2003年 | 2023篇 |
2002年 | 2119篇 |
2001年 | 3858篇 |
2000年 | 3081篇 |
1999年 | 3265篇 |
1998年 | 3655篇 |
1997年 | 3480篇 |
1996年 | 3379篇 |
1995年 | 3231篇 |
1994年 | 1958篇 |
1993年 | 1575篇 |
1992年 | 1420篇 |
1991年 | 1456篇 |
1990年 | 1108篇 |
1989年 | 1220篇 |
1988年 | 1050篇 |
1987年 | 897篇 |
1986年 | 919篇 |
1985年 | 746篇 |
1984年 | 567篇 |
1983年 | 540篇 |
1982年 | 521篇 |
1981年 | 409篇 |
1980年 | 361篇 |
1979年 | 317篇 |
1978年 | 334篇 |
1977年 | 405篇 |
1975年 | 278篇 |
1972年 | 310篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
992.
Martha L. Neighbor MD Samantha Honner MD Michael A. Kohn MD MPP 《Academic emergency medicine》2004,11(12):1290-1296
OBJECTIVES: Studies of emergency department (ED) pain management in patients with trauma have been mostly restricted to patients with fractures, yet the potential for undertreatment of more severely injured patients is great. The authors sought to identify factors associated with failure to receive ED opioid administration in patients with acute trauma who subsequently required hospitalization. METHODS: At an urban Level 1 trauma center and teaching hospital, a retrospective cohort study of trauma team activation patients requiring hospitalization between January 1 and December 31, 1999, was conducted. The authors excluded patients receiving opioids only within ten minutes of chest tube insertion or fracture manipulation. The main outcome measure was ED opioid administration. RESULTS: A total of 540 charts of hospitalized first-tier trauma team activation patients were reviewed. A total of 258 (47.8%) received intravenous opioid analgesia within three hours of ED arrival. The median time to receiving the first dose of opioids was 95 minutes. Patients were independently less likely to receive opioids if they were younger or older, were intubated, had a lower Revised Trauma Score, or did not require fracture manipulation. Patients with these factors were less likely to receive opioids independent of the amount of time they spent in the ED. CONCLUSIONS: Many trauma activation patients requiring hospitalization do not receive opioid analgesia in the ED. Patients at particular risk for oligoanalgesia include those who are younger or older and those who are more seriously injured, as defined by a lower Revised Trauma Score, lower Glasgow Coma Scale score, and intubation. 相似文献
993.
BACKGROUND: A common problem facing patients suffering from psoriasis is the need for surgery that requires incision through active psoriatic skin. Many patients have been denied surgery because of the fear of an increased risk of infection, decreased wound healing ability, and worsening of the psoriatic lesions. OBJECTIVE: To assess the practices and beliefs of dermatologists and surgeons (orthopedic and plastic surgeons) faced with the decision of whether to operate through active psoriatic skin. METHODS: Dermatologists, orthopedic surgeons, and plastic surgeons selected from various professional membership lists from five representative cities were sent a survey to ascertain their opinions on operating on active psoriatic skin. Psoriatic patients were also given forms asking about the severity of their psoriasis and whether they had ever been denied surgery. RESULTS: Dermatologists are more likely to condone surgery in active psoriatic skin and to believe that there is not a risk of increased infection or decreased wound healing than are orthopedic surgeons and plastic surgeons. These findings are statistically significant (P<0.05). CONCLUSION: With proper preoperative measures and dermatologic treatment, surgery can be performed on active psoriatic skin in most cases with minimal reservations, although a controlled, prospective study is necessary to arrive at a definitive conclusion. 相似文献
994.
Kann Holmén RN Doctoral Student Kjerstin Ericsson RN PhD Researcher Lars Andersson DMSc Associate Professor Bengt Winblad MD Professor 《Journal of advanced nursing》1992,17(1):43-51
The purpose was to investigate experienced loneliness among the elderly. The material included 1725 people, aged 75 and over. The study describes relationships between loneliness, social network, cognitive function and health. Thirty-five per cent experienced loneliness, and a higher percentage was found among women. A gradual increase in loneliness was found up to the age of 90, after which a levelling was found. Elderly persons living together with a partner experienced less loneliness. There were no significant differences between those with and without children. Ten per cent reported not having any friends and, of these, one out of two experienced loneliness. A high frequency of experienced loneliness was found among elderly people with reduced cognitive function. Subjectively experienced bad health and loneliness were strongly related to each other, i.e. a person who experienced loneliness did usually not feel completely healthy. 相似文献
995.
996.
Shunichi Takaya MD Shunzaburo Iwatsuki Takashi Noguchi Hisaaki Koie Iman Zaghloul Raman Venkataramanan Thomas E. Starzl 《Surgery today》1989,19(1):49-56
The influence of experimentally induced hepatic dysfunction on the pharmacokinetics of Cyclosporine A (CsA) was determined
in dogs. The pharmacokinetics of oral (PO) and intravenous (IV) CsA were studied before and after 70 per cent hepatectomy
or complete bile duct ligation (CBDL). Changes in liver function were monitored by serial measurements of serum bilirubin,
and by the maximum removal rate (Rmax) and plasma disappearance rate (ICG-K) of indocyanine green (ICG). Concentrations of
CsA in whole blood were measured by HPLC. Seventy per cent hepatectomy caused significant liver dysfunction: the ICG-Rmax
decreased by 47.7±7.1 per cent (mean±SD) and the ICG-K decreased by 61.3±9.7 per cent during the first week after hepatectomy.
At the same time, the systemic clearance (CLs) of IV-CsA decreased by 43.9±8.2 per cent, the area under the concentration
curve (AUC) of IV-CsA increased by 35.4±20.8 per cent and the bioavailability of CsA decreased by 26.4±14.8 per cent. CBDL
also induced significant liver dysfunction: the ICG-Rmax decreased by 39.1±12.8 per cent and the ICG-K decreased by 65.6±3.6
per cent in the second week after the operation. During the same period, the AUC of PO-CsA decreased by 69.9±10.7 per cent
and the bioavailability of CsA also decreased markedly by 73.9±15.6 per cent. These data indicate that hepatic impairment
significantly influences the pharmacokinetics of CsA, not only by the changes in intestinal absorption, but also by those
in hepatic, metabolism. Dose adjustment is therefore necessary in the presence of hepatic dysfunction in order to maintain
an adequate blood concentration of CsA without causing side effects.
This research was performed in the Department of Surgery, University of Pittsburgh Health Center, University of Pittsburgh,
USA 相似文献
997.
998.
Ronald R. Watson PhD Mary E. Mohs MS RD Cteamond Eskelson PhD Richard E. Samptiner MD Barbara Hartmann PhD 《Alcoholism, clinical and experimental research》1986,10(4):364-385
The prevalence and incidence of heavy alcohol consumption are major problems which have been increasing in many countries in recent years. It is crucial for physicians to consistently identify early drinking problems as well as the various end disease states in order to minimize suffering and maximize recovery. This paper reviews the evolutionary development of clinical tools for detection of alcohol abuse. The focus is primarily on clinical/biochemical indicators of alcohol abuse, emphasizing but not limited to changes in hematological characteristics, liver enzyme activity, lipids, immune function factors, hormones, neurological factors, and some physically based tests. Use of test combinations and sophisticated statistical analysis of pattern changes in test batteries evidence increased diagnostic efficiency. 相似文献
999.
1000.