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   2281篇
  免费   122篇
  国内免费   7篇
耳鼻咽喉   12篇
儿科学   138篇
妇产科学   18篇
基础医学   357篇
口腔科学   45篇
临床医学   191篇
内科学   374篇
皮肤病学   30篇
神经病学   186篇
特种医学   82篇
外科学   301篇
综合类   36篇
一般理论   3篇
预防医学   117篇
眼科学   77篇
药学   249篇
中国医学   6篇
肿瘤学   188篇
  2022年   20篇
  2021年   60篇
  2020年   34篇
  2019年   48篇
  2018年   62篇
  2017年   31篇
  2016年   60篇
  2015年   61篇
  2014年   82篇
  2013年   102篇
  2012年   168篇
  2011年   169篇
  2010年   93篇
  2009年   76篇
  2008年   129篇
  2007年   109篇
  2006年   119篇
  2005年   101篇
  2004年   86篇
  2003年   83篇
  2002年   75篇
  2001年   58篇
  2000年   50篇
  1999年   63篇
  1998年   34篇
  1997年   11篇
  1996年   12篇
  1995年   10篇
  1992年   28篇
  1991年   21篇
  1990年   25篇
  1989年   32篇
  1988年   13篇
  1987年   16篇
  1986年   12篇
  1985年   19篇
  1984年   14篇
  1983年   12篇
  1982年   10篇
  1980年   13篇
  1979年   9篇
  1976年   9篇
  1975年   12篇
  1974年   15篇
  1973年   12篇
  1971年   14篇
  1970年   11篇
  1969年   10篇
  1968年   16篇
  1966年   13篇
排序方式: 共有2410条查询结果,搜索用时 15 毫秒
1.
INTRODUCTION: Autoimmune hepatitis (AIH) is a well-defined entity in the West but there are sparse Indian data on this disease. AIM: To study the clinical profile and response to treatment of Indian patients with AIH. METHODS: This is a part retrospective and part prospective study of 50 patients (median age 48 years, range 11-82; 43 women) seen between 1995 to 2001, diagnosed to have AIH as per the revised scoring system. Clinical and laboratory profile, response to treatment, and complications of treatment were analyzed. RESULTS: AIH accounted for 6% of all patients with liver disease seen during the period. The presenting symptoms were gastrointestinal in 43 and non-gastrointestinal in 7, with median symptom duration of 6 months (range 2 weeks to 40 years). Forty patients (80%) had chronic liver disease. Associated illnesses were present in 28 patients. Twenty-six patients were classified as definite and the rest as probable AIH. Forty-nine patients had Type 1 AIH. Five patients had overlap syndrome. Forty-five patients (90%) received immunosuppressive therapy. Twelve of 18 patients receiving only prednisolone and 21 of 27 patients receiving prednisolone and azathioprine combination responded. Thirteen (26%) patients had therapy-related complications (infectious 5, non infectious 8) with two treatment-related deaths. CONCLUSION: Type 1 AIH was the predominant type of AIH. The majority of patients with AIH presented with chronic liver disease. There was good response to immunosuppressive therapy. Therapy-related complications occurred in one-fourth of patients.  相似文献   
2.
3.
Management of cerebral hemispherectomy in children   总被引:4,自引:0,他引:4  
Surgical removal of a cerebral hemisphere may be undertaken in patients with intractable seizure disorders. Anesthetic management of such patients has not been reviewed in detail before. This study retrospectively analyzed hospital records of ten patients undergoing cerebral hemispherectomy at the Johns Hopkins Hospital between July 1983 and February 1988. Patient records were reviewed for diagnosis, physical characteristics, preoperative medications, anesthetic management, and postoperative course in the intensive care unit (ICU). Massive and sudden blood loss was a common finding in these patients, and during the intraoperative and postoperative periods, fluid resuscitation frequently was an ongoing process. In some patients, the blood loss exceeded one blood volume and was associated with coagulopathy, hypokalemia, and hypothermia. Urine output was elevated by a glucose-induced diuresis in some patients, giving misleading information as to intravascular volume status. Seizures and hemorrhage into the hemispherectomy cavity were management problems in the ICU. From this review, the authors conclude that blood loss may be marked and precipitous during surgical removal of a cerebral hemisphere. Monitoring of intra-arterial pressure and central venous pressure (CVP) is necessary for patient management during the intraoperative and postoperative periods. Intravenous (IV) access should allow rapid intravascular volume administration as it becomes necessary. Patients should remain intubated and observed closely during the immediate postoperative period due to difficulties with hemodynamic stability, seizures, and hemorrhage.  相似文献   
4.
5.
6.
Fear of falling and postural control in Parkinson's disease.   总被引:4,自引:0,他引:4  
This study investigated the relationship between fear of falling (FOF) and qualitative and quantitative postural control in Parkinson's disease (PD). Fifty-eight nondemented PD patients were studied along with age-matched healthy controls. The degree of FOF was estimated using the Activities-specific Balance Confidence scale. Qualitative postural control was evaluated using a component of the Unified Parkinson Disease Rating Scale. Postural control was quantified, using centre of pressure measures obtained from a force plate, for eight standing balance tests of different challenges. The results showed that FOF was more evident for PD patients when compared with healthy individuals of similar age. Furthermore, FOF was significantly associated with a qualitative estimate of postural control in PD; individuals with PD who had a greater degree of posture impairment reported greater FOF. The results also showed that an estimate of FOF may help to explain quantitative postural instability in PD. FOF, when coupled with a qualitative estimate of postural control, was able to explain a greater amount of variation in quantitative balance performance for five of the eight balance tests. When considered independently, the qualitative measure of postural control, in general, could not well predict quantitative balance performance. The greater degree of FOF and its possible association with altered postural control suggests that FOF should be considered as an important, independent risk factor in the assessment and treatment of postural instability in patients with PD.  相似文献   
7.
Esophageal diverticula are rarely found at the terminal portion, where they are called supradiaphragmatic or epiphrenic diverticula and occur in association with motility disorders of the terminal esophagus. We present here two cases of epiphrenic esophageal diverticulum, one of which was treated surgically.  相似文献   
8.
Infections constitute the main complication of parenteral nutrition, particularly in cancer patients, but prediction of catheter-related septicemias (CRS) has been little investigated. We have evaluated, in 200 consecutive episodes of parenteral nutrition (PN) in cancer patients, the factors contributing to infectious complications, and the predictive value of weekly blood cultures performed through the nutrition catheter. The median duration of PN was 22 days with a total of 5816 patient-days of PN, neutropenia (neutrophils < 1,000/mul) being present in 872 (15%). Catheters were placed either in a jugular vein (71% single-lumen silicone catheters, 18.5% double-lumen Hickman-Broviac catheters) or in a femoral vein (10.5%). We observed 62 episodes of septicemia of which 22 were CRS (11% incidence for the 200 cycles) and 40 were non-CRS (20% incidence); CRS were mostly due to Staphylococcus epidermidis (14 22 ). Neutropenic patients as a group did not suffer more CRS than non-neutropenic patients, but the risk of CRS was slightly increased when expressed per day of neutropenia (8 CRS/872 days vs 14 CRS/4942 days without neutropenia, P < 0.05). On the other hand, a femoral insertion site was associated with a much higher incidence of CRS (9 CRS/21 femoral catheters vs 13 CRS/179 jugular catheters, P < 0.0001). It was possible to evaluate 20 episodes of CRS for their predictability by weekly blood cultures: the sensitivity for detecting CRS due to Staphylococcus epidermidis was 67%, the specificity 92%, the negative predictive value 98% and the positive predictive value 36%. The simple and widely available procedure of routine surveillance blood cultures performed through the PN catheter should be further investigated, because it could help the clinician to determine the origin of recent fever, particularly to exclude CRS and avoid unnecessary removal of PN catheters.  相似文献   
9.
10.
Median rhomboid glossitis is an inflammatory lesion of the tongue, now believed to be secondary to candidiasis. We document a case of median rhomboid glossitis with heavy colonisation by Actinomyces in a 60-year-old male. We propose that Actinomyces, like Candida, induces pseudoepitheliomatous hyperplasia of the mucosa of the tongue and florid inflammatory hyperplasia of the underlying connective tissue, resulting in the characteristic elevated lesion. Actinomyces has not earlier been implicated as a cause of median rhomboid glossitis.  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