首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2251篇
  免费   133篇
  国内免费   17篇
耳鼻咽喉   20篇
儿科学   85篇
妇产科学   62篇
基础医学   366篇
口腔科学   60篇
临床医学   176篇
内科学   484篇
皮肤病学   50篇
神经病学   331篇
特种医学   74篇
外科学   236篇
综合类   5篇
预防医学   132篇
眼科学   20篇
药学   124篇
中国医学   13篇
肿瘤学   163篇
  2024年   6篇
  2023年   22篇
  2022年   56篇
  2021年   84篇
  2020年   47篇
  2019年   67篇
  2018年   80篇
  2017年   75篇
  2016年   74篇
  2015年   88篇
  2014年   112篇
  2013年   121篇
  2012年   182篇
  2011年   183篇
  2010年   100篇
  2009年   82篇
  2008年   125篇
  2007年   118篇
  2006年   124篇
  2005年   98篇
  2004年   88篇
  2003年   78篇
  2002年   79篇
  2001年   22篇
  2000年   20篇
  1999年   27篇
  1998年   20篇
  1997年   15篇
  1996年   19篇
  1995年   12篇
  1994年   11篇
  1993年   12篇
  1992年   10篇
  1991年   10篇
  1990年   12篇
  1989年   8篇
  1988年   8篇
  1987年   9篇
  1986年   10篇
  1985年   9篇
  1984年   12篇
  1983年   11篇
  1982年   6篇
  1980年   5篇
  1979年   5篇
  1974年   3篇
  1972年   4篇
  1971年   5篇
  1970年   3篇
  1965年   3篇
排序方式: 共有2401条查询结果,搜索用时 0 毫秒
81.
82.

Purpose

We aimed to clarify whether the short-term adverse neonatal outcomes associated with epidural analgesia are due to the epidural analgesia itself or to the instrumental delivery.

Methods

A retrospective case–control study was conducted to evaluate the relationship between epidural analgesia, labor length, and perinatal outcomes. A total of 350 pregnant women at term who delivered under epidural analgesia (cases) were compared with 1400 patients without epidural analgesia (controls).

Results

Vacuum extraction (6.5 vs. 2.9 %) and cesarean section (19.9 vs. 11.1 %) were more frequently performed in the cases than controls (p < 0.001). Using a Kaplan–Meier algorithm, it was determined that the mean lengths of the 1st and 2nd stages of labor and the overall durations of labor and delivery were significantly longer in cases compared with controls. A Cox regression analysis showed that the longer labor remained even after adjustment for parity. The neonatal variables stratified by mode of delivery were not different in cases and controls, except for a slightly lower umbilical arterial pH in spontaneous delivery for the cases group. However, the Apgar scores and umbilical arterial pH were significantly lower in the neonates delivered by vacuum extraction compared with those in the neonates delivered by spontaneous delivery or cesarean section, regardless of whether epidural analgesia was performed. A multivariable analysis showed that vacuum extraction much more consistently affected the arterial pH than the analgesia itself (the β coefficients were ?0.036 for epidural analgesia vs. ?0.050 for vacuum extraction).

Conclusion

Epidural analgesia was associated with slowly progressing labor, thus resulting in an increased rate of instrumental delivery. This instrumental delivery appears to adversely affect the neonatal outcomes more strongly than the analgesia itself.  相似文献   
83.
BackgroundShort hospitalization surgery is cost effective and convenient for both patients and healthcare system. Stapled transanal rectal resection (STARR) conducted with the new curved device, Contour Transtar, has proved an effective and safe procedure for treatment of obstructed defecation syndrome.The aim of this study was to determine the safety and feasibility of STARR, performed as a day-case procedure.Material and methodsRetrospective review was performed of all STARR performed as day-case surgery between September 2009 and February 2011. The entire study (intervention, data collection and data analysis) was conducted at the One-day Surgery Unit of the St. Andrea Hospital, Rome, Italy. All patients with surgical indication to STARR for the presence of an obstructed defecation syndrome were included in the study. We excluded from day-case protocol, patients over 65 years old, with an ASA score of III–IV or with a BMI over 35. The surgical technique reflects the original technique proposed by Antonio Longo with the exception of the longitudinal prolapse opening, which was created with the use of an electric scalpel between two Kocher clamps and not by an application of Transtar stapler. To evaluate the feasibility and safety of performing this procedure with short hospitalization, we investigated the presence and the time of presentation of post-operative complications.ResultsEighty-nine patients underwent STARR as a day-case regimen, and none presented major complications or required an extension of hospital stay or readmission.ConclusionsSTARR performed with Contour Transtar, in selected patients, is safe and feasible in day-case regimen if performed by expert surgeons and in a structure that allows the physician to keep the patient hospitalized or to re-admit and promptly treat those patients who present major surgical complication.  相似文献   
84.
Some forms of early ECG repolarization QRS pattern (ERp) with J‐point elevation of 0.1 mV in two contiguous inferior and/or lateral leads with or without ST‐elevation are potentially associated with a higher arrhythmic risk in adults. We assessed the prevalence of ERp among non‐professional adolescent athletes and correlated it with age, sex, ethnicity, and structural and electric cardiac parameters. We retrospectively analyzed 414 ECGs obtained from young athletes referred to our center from 2006 to 2017. We found ERp in 22% of cases. In the ERp group, we found a greater percentage of black athletes, a higher systolic blood pressure, and lower heart rate (HR) compared with the group without ERp. This pattern was less frequent in female athletes. In athletes with ERp, the occurrence of ventricular ectopic beats was less frequent and QRS‐duration was shorter. They also exhibited greater (a) ECG‐based left ventricular hypertrophy (LVH), (b) left ventricular mass, and (c) relative wall thickness (RWT), suggesting a tendency to concentric geometry. At logistic regression analysis, we found that HR (OR 0.98 [0.96‐0.99] P = .013), QRS‐duration (OR 0.96 [0.94‐0.99], P = .003), LVH (OR 1.09 [1.05‐1.12], P < .001), and RWT (OR 1.08 [1.01‐1.16] P = .032) were significant predictors of ERp incidence. ERp is quite common in adolescent athletes and correlates with concentric LV remodeling. Specific clinical and ECG‐findings related to training such as lower HR, LVH, and QRS‐duration are also predictors of ERp. In adolescent non‐professional athletes, ERp is a benign finding associated with some structural and electric cardiac modifications induced by training.  相似文献   
85.
Forensic Toxicology - MDMA is a psychoactive drug that has been increasingly abused worldwide, due to its entactogenic properties. However, concerns on its safety exist, particularly regarding its...  相似文献   
86.
Journal of Autism and Developmental Disorders - Behavioural phenotype and autism-related traits of 38 patients affected by Cornelia de Lange syndrome (CdLS) were assessed using a specific...  相似文献   
87.
Neurological Sciences - Subthalamic nucleus deep brain stimulation (STN-DBS) is an effective surgical treatment for advanced Parkinson’s disease (PD). However, some patients still experience...  相似文献   
88.
Neurological Sciences - Dysphagia is a common symptom during the trajectory of ALS, and it can significantly impact on the quality of life and prognosis of patients. Nowadays, no specific tool for...  相似文献   
89.
Oral mucositis (OM) and radiodermatitis (RD) are serious side effects of radiotherapy (RT), often leading to its suspension, need for analgesics, and enteral/parenteral nutrition. Laser therapy is becoming a recommended treatment option. This prospective study aimed at demonstrating the beneficial effect of class IV laser therapy (HPLT) on RT-induced OM, an off-label use of HPLT to treat RD in breast cancer patients. Fifty-three cancer patients, during/after RT and/or chemotherapy (CT), affected by OM, were treated with HPLT during four consecutive days (970?±?15 nm, 5 W (50 %), 35–6000 Hz, 240 s). Assessment of OM (Grading Objective Scale, WHO-SCALE), pain (visual analogue scale, VAS), functional ability, subjective parameters, and site/severity of OM were recorded over time. Similarly, 27 breast cancer patients affected by RD were treated by HPLT and monitored over time for grade, discomfort, itching, and bleeding. Progressive improvement of WHO-SCALE from day 7 on, and of VAS from day 2 on (p?<?0.000) was registered. All patients’ functional capacity improved on day 4 (p?<?0.05). All subjective parameters improved on day 14 (p?<?0.001) except for voice, which improved on day 21 (p?<?0.000). Ulcerations’ dimension and erythema’s severity significantly decreased in all sites examined (p?<?0.05). Similarly, HPLT proved to be beneficial in managing RD for all the parameters considered (p?<?0.002). Regardless of OM grade/site and of kind/site of tumor, HPLT proved to be effective in healing OM as well as RD. In both cases, effective treatment can improve life quality through a safe, easy, innovative approach. Therefore, HPLT may become an integral part of everyday practice in the management of RT adverse effects.  相似文献   
90.

Background

Fundoplication is considered a mainstay in the treatment of gastro-esophageal reflux. However, the literature reports significant recurrences and limited data on long-term outcome.

Aims

To evaluate our long-term outcomes of antireflux surgery in children and to assess the results of redo surgery.

Methods

We retrospectively analyzed all patients who underwent Nissen fundoplication in 8 consecutive years. Reiterative surgery was indicated only in case of symptoms and anatomical alterations. A follow-up study was carried out to analyzed outcome and patients’ Visick score assessed parents’ perspective.

Results

Overall 162 children were included for 179 procedures in total. Median age at first intervention was 43 months. Comorbidities were 119 (73 %), particularly neurological impairments (73 %). Redo surgery is equal to 14 % (25/179). Comorbidities were risk factors to Nissen failure (p = 0.04), especially children suffering neurological impairment with seizures (p = 0.034). Follow-up datasets were obtained for 111/162 = 69 % (median time: 51 months). Parents’ perspectives were excellent or good in 85 %.

Conclusions

A significant positive impact of redo Nissen intervention on the patient’s outcome was highlighted; antireflux surgery is useful and advantageous in children and their caregivers. Children with neurological impairment affected by seizures represent significant risk factors.
  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号