全文获取类型
收费全文 | 2363767篇 |
免费 | 198220篇 |
国内免费 | 4182篇 |
专业分类
耳鼻咽喉 | 34288篇 |
儿科学 | 72631篇 |
妇产科学 | 63180篇 |
基础医学 | 333208篇 |
口腔科学 | 67612篇 |
临床医学 | 214675篇 |
内科学 | 465957篇 |
皮肤病学 | 48068篇 |
神经病学 | 199720篇 |
特种医学 | 95948篇 |
外国民族医学 | 886篇 |
外科学 | 359934篇 |
综合类 | 56167篇 |
现状与发展 | 1篇 |
一般理论 | 977篇 |
预防医学 | 189809篇 |
眼科学 | 55404篇 |
药学 | 177678篇 |
4篇 | |
中国医学 | 4305篇 |
肿瘤学 | 125717篇 |
出版年
2018年 | 24264篇 |
2016年 | 20613篇 |
2015年 | 23340篇 |
2014年 | 33589篇 |
2013年 | 50918篇 |
2012年 | 69275篇 |
2011年 | 73017篇 |
2010年 | 42663篇 |
2009年 | 40978篇 |
2008年 | 69261篇 |
2007年 | 73695篇 |
2006年 | 74588篇 |
2005年 | 72578篇 |
2004年 | 69960篇 |
2003年 | 67496篇 |
2002年 | 66663篇 |
2001年 | 112496篇 |
2000年 | 116536篇 |
1999年 | 97854篇 |
1998年 | 26176篇 |
1997年 | 23784篇 |
1996年 | 23742篇 |
1995年 | 24459篇 |
1994年 | 23028篇 |
1993年 | 21433篇 |
1992年 | 79268篇 |
1991年 | 76377篇 |
1990年 | 73535篇 |
1989年 | 70795篇 |
1988年 | 65780篇 |
1987年 | 64752篇 |
1986年 | 61289篇 |
1985年 | 58372篇 |
1984年 | 44151篇 |
1983年 | 37541篇 |
1982年 | 22794篇 |
1981年 | 20228篇 |
1980年 | 18931篇 |
1979年 | 41223篇 |
1978年 | 28913篇 |
1977年 | 24247篇 |
1976年 | 22754篇 |
1975年 | 23902篇 |
1974年 | 29586篇 |
1973年 | 28009篇 |
1972年 | 26207篇 |
1971年 | 24142篇 |
1970年 | 22727篇 |
1969年 | 21063篇 |
1968年 | 19113篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
71.
72.
K. El-Boghdadly T. M. Cook T. Goodacre J. Kua S. Denmark S. McNally N. Mercer S. R. Moonesinghe D. J. Summerton 《Anaesthesia》2022,77(5):580-587
The impact of vaccination and new SARS-CoV-2 variants on peri-operative outcomes is unclear. We aimed to update previously published consensus recommendations on timing of elective surgery after SARS-CoV-2 infection to assist policymakers, administrative staff, clinicians and patients. The guidance remains that patients should avoid elective surgery within 7 weeks of infection, unless the benefits of doing so exceed the risk of waiting. We recommend individualised multidisciplinary risk assessment for patients requiring elective surgery within 7 weeks of SARS-CoV-2 infection. This should include baseline mortality risk calculation and assessment of risk modifiers (patient factors; SARS-CoV-2 infection; surgical factors). Asymptomatic SARS-CoV-2 infection with previous variants increased peri-operative mortality risk three-fold throughout the 6 weeks after infection, and assumptions that asymptomatic or mildly symptomatic omicron SARS-CoV-2 infection does not add risk are currently unfounded. Patients with persistent symptoms and those with moderate-to-severe COVID-19 may require a longer delay than 7 weeks. Elective surgery should not take place within 10 days of diagnosis of SARS-CoV-2 infection, predominantly because the patient may be infectious, which is a risk to surgical pathways, staff and other patients. We now emphasise that timing of surgery should include the assessment of baseline and increased risk, optimising vaccination and functional status, and shared decision-making. While these recommendations focus on the omicron variant and current evidence, the principles may also be of relevance to future variants. As further data emerge, these recommendations may be revised. 相似文献
73.
A.
Cumberworth H. Lewith A. Sud H. Jefferson V. Athanassoglou J. J. Pandit 《Anaesthesia》2022,77(6):640-648
We conducted an observational study of serious airway complications, using similar methods to the fourth UK National Audit Project (NAP4) over a period of 1 year across four hospitals in one region in the UK. We also conducted an activity survey over a week, using NAP4 methods to yield an estimate for relevant denominators to help interpret the primary data. There were 17 serious airway complications, defined as: failed airway management leading to cancellation of surgery (eight); airway management in recovery (five); unplanned intensive care admission (three); and unplanned emergency front of neck access (one). There were no reports of death or brain damage. This was an estimate of 0.028% (1 in 3600) complications using the denominator of 61,000 general anaesthetics per year in the region. Complications in patients with ‘predicted easy’ airways were rare (approximately 1 in 14,200), but 45 times more common in those with ‘predicted difficult’ airways (approximately 1 in 315). Airway management in both groups was similar (induction of anaesthesia followed by supraglottic airway or tracheal tube). Use of awake/sedation intubation, videolaryngoscopy and high-flow nasal oxygenation were uncommon even in the predicted difficult airway patients (in 2.7%, 32.4% and 9.5% of patients, respectively). We conclude that the incidence of serious airway complications is at least as high as it was during NAP4. Despite airway prediction being used, this is not informing subsequent management. 相似文献
74.
75.
76.
Alexander D. Sherry MD Kelsey L. Corrigan MD MPH Ramez Kouzy MD Joseph Abi Jaoude MD Yumeng Yang MS Roshal R. Patel MD Douglas J. Totten MD MBA Neil B. Newman MD MS Prajnan Das MD MS MPH Cullen Taniguchi MD PhD Bruce Minsky MD Rebecca A. Snyder MD MPH C. David Fuller MD PhD Ethan Ludmir MD 《Cancer》2023,129(21):3430-3438
77.
78.
79.
Comprehensive evidence regarding the treatment of non-anaemic iron deficiency in patients undergoing valvular heart surgery is lacking. This study aimed to investigate the association between non-anaemic iron deficiency and postoperative outcomes in these patients. We retrospectively analysed 321 patients of which 180 (56%) had iron deficiency (defined as serum ferritin < 100 ng.ml-1 or < 300 ng.ml-1 with transferrin saturation < 20%). While the iron-deficient group had lower pre-operative haemoglobin levels than the non-iron deficient group (median (IQR [range]) 134 (127–141 [120–172]) g.l-1, 143 (133–150 [120–179]) g.l-1, p = 0.001), there was no between-group difference in allogeneic red blood cell transfusion. Median (IQR [range]) days alive and out of hospital at postoperative day 90 was 1 day shorter in the iron-deficient group (80 (77–82 [9–85]) days vs. 81 (79–83 [0–85]) days, p = 0.026). In multivariable analysis, only cardiopulmonary bypass duration (p = 0.032) and intra-operative allogeneic red blood cell transfusion (p = 0.011) were significantly associated with reduced days alive and out of hospital at postoperative day 90. Iron deficiency did not exert any adverse influence on secondary outcomes except length of hospital stay. Our findings indicate that non-anaemic iron deficiency alone is not associated with adverse effects in patients undergoing valvular heart surgery when it does not translate into an increased risk of allogeneic transfusion. 相似文献