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   9058篇
  免费   620篇
  国内免费   64篇
耳鼻咽喉   62篇
儿科学   218篇
妇产科学   192篇
基础医学   1594篇
口腔科学   122篇
临床医学   897篇
内科学   2309篇
皮肤病学   126篇
神经病学   810篇
特种医学   178篇
外科学   712篇
综合类   41篇
一般理论   1篇
预防医学   790篇
眼科学   131篇
药学   768篇
中国医学   28篇
肿瘤学   763篇
  2024年   11篇
  2023年   117篇
  2022年   263篇
  2021年   401篇
  2020年   209篇
  2019年   277篇
  2018年   325篇
  2017年   236篇
  2016年   226篇
  2015年   323篇
  2014年   358篇
  2013年   511篇
  2012年   719篇
  2011年   723篇
  2010年   391篇
  2009年   368篇
  2008年   617篇
  2007年   656篇
  2006年   585篇
  2005年   537篇
  2004年   440篇
  2003年   437篇
  2002年   393篇
  2001年   23篇
  2000年   38篇
  1999年   49篇
  1998年   72篇
  1997年   52篇
  1996年   35篇
  1995年   26篇
  1994年   12篇
  1993年   16篇
  1992年   11篇
  1991年   12篇
  1989年   8篇
  1988年   10篇
  1987年   11篇
  1986年   11篇
  1985年   16篇
  1984年   11篇
  1982年   7篇
  1981年   22篇
  1980年   11篇
  1979年   8篇
  1978年   12篇
  1977年   13篇
  1976年   8篇
  1975年   9篇
  1974年   10篇
  1961年   6篇
排序方式: 共有9742条查询结果,搜索用时 0 毫秒
41.
ObjectivesThe COVID-19 pandemic has significantly impacted the healthcare systems. Many Polish outpatient clinics have been implementing telemedical consultations as a tool to ensure the continuity of care for patients with chronic diseases. The aim of the study was to evaluate patients’ satisfaction with telemedical appointments, as well as availability of the various medical services and patients’ well-being during the pandemic.Material and methodsAn online-based questionnaire on the experience with telemedical consultations, availability of medical services and current state of health was conducted among Polish rheumatology patients approximately 6 months after the outbreak of the COVID-19 pandemic.ResultsThe survey was completed by 107 respondents with a mean age of 41.52 ±14.33 years. The overall level of satisfaction from telemedical consultations, evaluated with a VAS 1–10 scale, was assessed as 6.23 ±3.04 for teleconsultations in primary healthcare units and 6.00 ±2.80 for rheumatology outpatient units. 42.99% of the respondents were in favour of maintaining telemedical appointments even after the pandemic. Incidences of reduced access to medical services during the COVID-19 pandemic were reported by 77.57% of the patients. Almost half of the respondents reported reduced accessibility to rheumatological care. An alarming decline in health self-esteem, evaluated with a VAS 1–10 scale, was noted from the average 6.37 ±1.92 before COVID-19 to the current rating of 5.78 ±1.91 (p = 0.0087).ConclusionsPolish rheumatology patients are moderately satisfied with the medical teleconsultations in primary health care units and rheumatology outpatient clinics. A substantial number of patients experienced deterioration of well-being as well as limited access to traditional healthcare services, including rheumatology care.  相似文献   
42.
Arthrodesis of the first metatarsophalangeal (MTP) joint has been established as the “gold standard” for the treatment of several first ray disorders, due to its perceived efficacy and the consistently reported good results in the literature. Arthrodesis is a commonly performed procedure for the treatment of end stage arthritis, rheumatoid arthritis with severe deformity, selected cases of severe hallux valgus (with or without signs of degenerative joint disease), as well as a salvage procedure after failed previous operation of the first ray. The goals of a successful 1st MTP arthrodesis are pain alleviation and deformity correction in order to restore a comfortable gait pattern and to improve shoe wear. Several techniques have been reported with several proposals regarding the preparation of the articular surfaces and the method of definitive fixation. As with any given surgical procedure, various complications may occur after arthrodesis of the 1st MTP joint, namely delayed union, nonunion, malunion, irritating hardware, etc.   相似文献   
43.
ObjectiveTo validate a Russian-language version of the World Health Organization’s Alcohol Use Disorders Identification Test (AUDIT).MethodsWe invited 2173 patients from 21 rural and urban primary health-care centres in nine Russian regions to participate in the study (143 declined and eight were excluded). In a standardized interview, patients who had consumed alcohol in the past 12 months provided information on their sociodemographic characteristics and completed the Russian AUDIT, the Kessler Psychological Distress Scale and the Composite International Diagnostic Interview to identify problem drinking and alcohol use disorders. We assessed the feasibility of administering the test, its internal consistency and its ability to predict hazardous drinking and alcohol use disorders in primary health care in the Russian Federation.FindingsOf the 2022 patients included in the study, 1497 were current drinkers with Russian AUDIT scores. The test was internally consistent with good psychometric properties (Cronbach’s α : 0.842) and accurately predicted alcohol use disorders and other outcomes (area under the curve > 75%). A three-item short form of the test correlated well with the full instrument and had similar predictive power (area under the curve > 80%). We determined sex-specific thresholds for all outcomes, as non-specific thresholds resulted in few women being identified.ConclusionWith the validated Russian AUDIT, there is no longer a barrier to introducing screening and brief interventions into primary health care in the Russian Federation to supplement successful alcohol control policies.  相似文献   
44.
We report the clinical and morphological features of a distinctive hepatorenal disorder in four patients and review the five similar patients in the literature. The main clinical characteristics were early onset of cholestatic liver disease and progressive tubulointerstitial nephritis leading to renal death in early childhood. Liver histology showed disturbed architecture with nodular and acinar formations and portal fibrosis and bile duct proliferation. Histological abnormalities in the kidney were severe interstitial fibrosis and tubular atrophy and dilatation, while the typical features of nephronophthisis were lacking. These clinical and morphological characteristics distinguish our patients from the majority described, as having nephronophthisis and congenital hepatic fibrosis or any other known syndrome with concomitant hepatorenel involvement. We suggest that the association of cholestatic liver disease and progressive tubulointerstitial nephritis represents a new syndrome.  相似文献   
45.
From January 1988 to September 1989, seven patients (4 girls and 3 boys, aged 3–12 years) with haemorrhagic fever with renal syndrome (HFRS) were hospitalised at the University Children's Hospital in Belgrade. In four patients the disease appeared as a family outbreak, the others were sporadic cases. In six patients the clinical presentation was suggestive of HFRS, as they had fever with headache, myalgia, sore throat and gastrointestinal illness followed by renal abnormalities. However, severe haemorrhagic syndrome with petechia, haematoma, haematemesis and melaena was present in one patient only. Renal disease presented as nephritic syndrome and/or acute renal failure. Five patients recovered after 2–3 weeks without sequellae, one patient had decreased renal function 17 months after the start of the disease and the remaining patient died. In six patients the diagnosis of HFRS was confirmed serologically by a significant rise in antibody titres against hantaviruses, while in the patient with the fatal and fulminant course of the disease, the diagnosis was established on the basis of epidemiological and autopsy findings. We suggest that children living in endemic areas who develop an ill-defined, febrile and gastrointestinal disease with renal dysfunction should be evaluated for HFRS.  相似文献   
46.
The St. John's Wort (Hypericum perforatum) extract (Hp) represents one of the most useful natural therapeutic agents in the treatment of moderate and mild depression. The antidepressant effects of Hp are different, by a molecular mechanism point of view, when compared to those of other antidepressant drugs and, we think, a further pharmacological characterization is needed. It is suggested that the neurochemical effects of Hp could be bind either to its activity on the uptake of some mediators in the central nervous system or to the inhibition of some enzymatic activity at the receptor level. The present study carried out with the loose patch clamp (LPC) in the mouse neuromuscular junction, indicates a potentiation of the acetylcholine (ACh) action at the mouse neuromuscular junction. The spontaneous release of ACh was unaffected by Hp indicating that neither presynaptic nor postsynaptic function are modified by Hp. Indeed, both the frequency and the amplitude of the miniature end-plate currents (mepcs) were unmodified by Hp. Furthermore, the mepcs decay time (tau), i.e. the apparent cholinergic channel life time, was significantly increased after Hp treatment. The other parameter affected was the amplitude of the evoked end-plate currents (epcs) which was constantly and in a dose dependent manner increased by Hp. These findings suggest a possible action of Hp on the acetylcholinesterase (AChE) in terms of a reduction of the degradation rate of ACh.  相似文献   
47.
The therapeutic alliance is a well-studied construct factor that is important to outcome in many forms of individual therapy. Therapeutic alliance has been rarely studied in group therapy and results in addiction treatment have been mixed. In this paper, we studied the presence of a therapeutic alliance in Network Therapy: an approach that uses peer and family support in addiction treatment. Twenty-one participants undergoing Network Therapy for cocaine addiction were observed on videotape, and were rated on therapeutic alliance using the Working Alliance Inventory and the Penn Helping Alliance Rating Scale. Results showed a significant positive correlation between therapeutic alliance and outcome as measured by the percentage of cocaine-free urine toxicology screens and by eight consecutive cocaine-free urines.  相似文献   
48.
This study analysed the effect of low doses ofverapamil added to chronic treatment withangiotensin-converting enzyme (ACE) inhibitors onblood pressure and serum creatinine levels in eightelderly hypertensive patients who had a steadyincrease of serum creatinine while on ACE inhibitors.The study was performed in eight elderly hypertensivesubjects, five men and three women (mean age 70 ±2 years; systolic blood pressure 173 ± 4 mmHg; diastolic blood pressure 99 ± 1 mm Hg) andserum creatinine of 1.60 ± 0.27 mg/dl beforetreatment. During an average of 25 weeks, ACEinhibitors significantly reduced both systolic anddiastolic blood pressures, but serum creatinine levelswere increased over basal levels (0,68 ± 0,20 mg/dl, p < 0.05). During an average of 10 weeks,the addition of verapamil did not decrease bloodpressure further, but serum creatinine levels werereduced to baseline. Our study suggests that theaddition of verapamil to ACE inhibitors can reverseACE-induced increase in creatinine levels in elderlyhypertensive patients in whom this side effect isobserved. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   
49.
PURPOSE: To evaluate safety and preliminary efficacy of the humanized anti-epidermal growth factor receptor monoclonal antibody h-R3 in combination with radiotherapy (RT) in unresectable head and neck cancer patients. Secondary end points were the measurement of h-R3 serum levels and the assessment of the potential mechanisms of antitumor effect on patient biopsies. Anti-idiotypic response to h-R3 was assessed. To predict pharmacologic effect, a mathematical model for antibodies recognizing antigens expressed in tumors and normal tissues was built. PATIENTS AND METHODS: Twenty-four patients with advanced carcinomas of the head and neck received six once-weekly infusions of h-R3 at four dose levels in combination with RT. Pretreatment tumor biopsies were obtained to evaluate epidermal growth factor receptor expression as an enrollment criterion. Second biopsies were taken to evaluate the proliferative activity and angiogenesis in comparison with the pretreatment samples. Patient serum samples were collected to measure h-R3 levels and anti-idiotypic response. RESULTS: The combination of h-R3 and RT was well tolerated. Antibody-related adverse events consisted in infusion reactions. No skin or allergic toxicity appeared. Overall survival significantly increased after the use of the higher antibody doses. Immunohistochemistry studies of tumor specimens before and after treatment revealed that antitumor response correlated with antiproliferative and antiangiogenic effect. One patient developed antibodies to h-R3. The mathematical model predicted that the maximum difference between the area under the curve in tumors and normal tissues is reached when the antibody has intermediate affinity. CONCLUSION: h-R3 is a well-tolerated drug that may enhance radiocurability of unresectable head and neck neoplasms.  相似文献   
50.
Knowledge concerning patterns of health care utilization among Latino-adolescent immigrants is needed to develop culturally-appropriate programs. The objectives of this study were to estimate the annual prevalence of having had a routine physical exam and episodes of adolescents’ not seeking health care when they thought they should (forgone health care) among Latino adolescents by immigrant-generational status. Cross-sectional analysis of data from Latino adolescents in Wave I of the National Longitudinal Adolescent Health Study. First-generation immigrants who had lived in the U.S. ≤ 5 years were less likely to receive routine care than third-generation immigrants (39.0% vs. 54.9%). This disparity decreased after adjustment for insurance status, parental education and poverty among Mexican origin adolescents. On average, 16.0% of first-generation immigrants who had lived in the U.S. ≤ 5 years and 22.5% of third-generation immigrants reported forgoing health care. After adjustment for age, insurance status, parental education and routine care, recent arrivals were less likely than third-generation immigrants to forgo health care. Recent arrivals were less likely to receive a routine physical exam and to forgo care than third-generation immigrants. Future studies should explore the effect of acculturation on knowledge, beliefs and perceptions about health, illness and care-seeking behaviors.  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