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   1593篇
  免费   129篇
  国内免费   10篇
耳鼻咽喉   25篇
儿科学   34篇
妇产科学   30篇
基础医学   239篇
口腔科学   17篇
临床医学   170篇
内科学   396篇
皮肤病学   62篇
神经病学   102篇
特种医学   37篇
外科学   156篇
综合类   38篇
预防医学   144篇
眼科学   37篇
药学   124篇
中国医学   7篇
肿瘤学   114篇
  2023年   22篇
  2022年   30篇
  2021年   52篇
  2020年   32篇
  2019年   51篇
  2018年   60篇
  2017年   54篇
  2016年   54篇
  2015年   74篇
  2014年   78篇
  2013年   90篇
  2012年   156篇
  2011年   129篇
  2010年   73篇
  2009年   54篇
  2008年   98篇
  2007年   87篇
  2006年   83篇
  2005年   83篇
  2004年   73篇
  2003年   60篇
  2002年   54篇
  2001年   28篇
  2000年   27篇
  1999年   13篇
  1998年   7篇
  1997年   8篇
  1996年   5篇
  1995年   5篇
  1994年   2篇
  1993年   2篇
  1992年   8篇
  1991年   8篇
  1990年   10篇
  1989年   11篇
  1988年   8篇
  1987年   3篇
  1986年   2篇
  1985年   2篇
  1984年   11篇
  1983年   6篇
  1980年   1篇
  1979年   4篇
  1978年   1篇
  1977年   2篇
  1976年   1篇
  1970年   3篇
  1965年   2篇
  1957年   1篇
  1941年   1篇
排序方式: 共有1732条查询结果,搜索用时 31 毫秒
91.
骨原发性间变性大细胞淋巴瘤临床病理观察   总被引:3,自引:0,他引:3  
目的探讨骨原发性间变性大细胞淋巴瘤(ALCL)的临床病理特点、鉴别诊断及预后。方法观察4例骨原发性ALCL的临床病理和免疫组化特点,随访7~45个月,并复习相关文献。结果骨原发性ALCL多见于中、青年男性。组织形态上,肿瘤细胞弥漫浸润骨组织,细胞高度异型,核分裂象多;免疫组化标记示CD30和EMA(+),ALK-1和粒酶B(+)较多。4例患者中,2例分别在随访7个月和11个月时死亡。结论骨原发性ALCL十分罕见,明确诊断依赖于组织形态学观察及免疫组化标记,其预后可能存在个体差异。  相似文献   
92.
目的 研究食管癌术后调强放疗剂量学与胸腔胃放射性损伤的关系。方法 通过入组104例食管癌根治术后行调强放疗的患者,对其临床资料及放疗计划中胸腔胃剂量-体积参数与急性放射性胸腔胃炎的发生情况进行分析,ROC曲线分析与急性放射性胃炎发生可能相关的物理学指标,logistic法行单因素及多因素分析。结果 全组104例患者出现≥ 2级急性放射性胸腔胃炎者29例(27.88%)。与≥ 2级急性放射性胸腔胃炎相关的剂量-体积指标包括:胸腔胃DmaxDmeanL5~L45V5~V50。单因素分析显示,胸腔胃位置、胸腔胃DmaxDmean、胸腔胃L5~L45V5~V50均与≥ 2级急性放射性胸腔胃炎的发生显著相关(P<0.05);多因素分析显示,胸腔胃位置、L5V35与≥ 2级急性放射性胸腔胃炎的发生均显著相关(P<0.05)。ROC曲线所得L5V35的最佳界值分别为14.00 cm和44.00%,胸腔胃L5 ≥ 14.00 cm和L5<14.00 cm发生≥ 2级急性放射性胸腔胃炎的概率分别为38.64%和20.00%(χ2=4.473,P<0.05);V35 ≥ 44.00%和V35<44.00%发生≥ 2级急性放射胸腔胃炎的概率分别为57.58%和14.08%(χ2=7.263,P<0.05)。后纵隔胃患者≥ 2级急性放射性胸腔胃炎的发生率显著高于其他两组(χ2=12.881,P<0.05)。结论 胸腔胃剂量-体积参数对急性放射性胸腔胃炎的发生具有一定的预测价值,建议对术后需行放疗的食管癌患者慎重选择后纵隔胸腔胃手术方案。  相似文献   
93.
Numerous studies show that breastfeeding is beneficial to both mothers and babies. This study explores two understudied correlates that may influence breastfeeding initiation: intimate partner violence during pregnancy and early postnatal depressive symptoms. A cross-sectional comparative study design investigated the correlates of feeding modes of 1200 Chinese mother and infant pairs in a university-affiliated regional hospital in Hong Kong. The prevalence rates of breastfeeding and mixed feeding were 42.25% and 26.25%, respectively. Women who had no experience of intimate partner violence during pregnancy were significantly more likely to initiate breastfeeding (adjusted odds ratio = 1.84; 95% confidence interval, 1.16-2.91) after adjustment for demographic, socioeconomic, and obstetric variables. Early postnatal depressive symptoms were not significantly associated with feeding modes in a multinomial logistic regression model. Midwives are in a key position to identify and intervene to encourage more successful breastfeeding practice.  相似文献   
94.
Background: Cytoreductive surgery and hyperthermic intra-peritoneal chemotherapy (CRS-HIPEC) prolongs survival in patients with metastatic peritoneal disease. We look at the incidence of acute kidney injury (AKI) in patients who have received cisplatin during CRS-HIPEC in the treatment of peritoneal carcinomatosis from an ovarian primary, and identify possible peri-operative risk factors.

Methods: Between 2005 and 2013, we performed CRS-HIPEC on 47 patients with ovarian primaries and peritoneal metastasis. Retrospective data were collected on the patient’s demographics, treatment details and outcomes. Renal impairment was graded according to the NCI-CTCAE 3.0 criteria.

Results: There were 47 patients, with a median age of 50 (24–74) years. The median baseline creatinine was 53?μmol/L (23–102) and median baseline albumin of 39?g/L (13–45). All underwent pre-operative chemotherapy for a median of six cycles (0–22) with a median of 15?days between chemotherapy and surgery. They received intra-operative cisplatin at a temperature of 40?°C for 60?min at a median dose of 90?mg/kg. 19 (40.4%) experienced post-operative AKI, of which 5 (8.5%) developed grade 3 and 4 impairment. Two (4.3%) required long-term dialysis. Univariate analysis showed that risk factors for AKI included age, baseline creatinine, baseline estimated glomerular filtration rate, pre-operative albumin, number of cycles of pre-operative carboplatin, time interval between pre-operative chemotherapy and CRS-HIPEC and volume of blood transfusions.

Conclusions: Identification of risk factors for AKI post-CRS-HIPEC helps improve pre-operative patient selection and optimisation, facilitate tailoring of chemotherapy, and foster closer peri-operative monitoring and fluid management in at-risk patients.  相似文献   
95.
Background and Aim: The early detection of hepatocellular carcinoma (HCC) and opportunity to select appropriate treatment are important benefits of HCC screening. Our aim in the present study was to investigate the survival rate, prognostic factors and treatment effects in HCC patients of community‐based screening. Methods: Community‐based ultrasound (US) screening for HCC in adults with platelet counts (< 150 × 103/mm3) and/or alpha fetoprotein (AFP) > 20 ng/mL was conducted in 2002 and 2004. As per the Barcelona Clinic Liver Cancer (BCLC) stage, 90 cases of intermediate or earlier stage HCC were detected and 88 cases had sufficient information for analysis (49 men and 39 women, aged 65.8 ± 9.6 years). The tumor diameter was mostly less than 5 cm (76.1%). The follow up was continued until June 2008. Results: The 4‐year overall survival rate was 46.8%. Old age (≥ 70 years) (P = 0.046), later stage of HCC (intermediate vs earlier) (P = 0.012), low platelet count (< 100 × 103/mm3) (P = 0.013) and refusal of modern treatment (P = 0.026) were independent poor prognostic factors. Curative treatment increased survival in patients of all ages. Both curative treatment and transcatheter arterial embolization (TAE) increased survival in cases of intermediate HCC. However, treatment benefits were not found for patients with (very) early stage HCC. Conclusions: Early detection and prompt treatment of HCC leads to increased survival. For elderly patients this benefit was seen only for early stage cases receiving curative treatment. Differences between treatment types for patients with (very) early stage HCC might emerge with a longer follow‐up period.  相似文献   
96.
97.
Background and Aim: This study attempted to clarify accuracy of acute hepatitis C (AHC) and its clinical characteristics. Methods: We reviewed 632 reported cases from national surveillance data of the Taiwan Center for Disease Control between 1995 and 2004, and reclassified diagnoses. A definite case was defined as alanine aminotransferase (ALT) > 10 × the upper limit of normal (ULN) with seroconversion of anti‐hepatitis C virus antibody (anti‐HCV). A probable case was defined as (i) seroconversion of anti‐HCV and/or elevated ALT levels; or (ii) anti‐HCV(+) but titers increased (from < 40 S/CO to ≥ 40 S/CO) and ALT > 10 × the ULN. A suspected case was defined as initial anti‐HCV(+) and ALT level > 10 × the ULN and/or jaundice. Excluded cases were defined as ALT levels less than 10 × ULN with initial positive anti‐HCV Ab. Results: A total of 310 (49%) cases were confirmed as AHC; these included 95 (15%) definite and 215 (34%) probable cases. Higher incidence rates and accuracy of AHC were demonstrated in the southern area significantly if compared with northern, eastern and central areas, respectively (all P < 0.05). On comparison between blood centers and hospitals, more AHC cases were found in Southern Taiwan than in other areas (157/73 vs 24/40, P < 0.001), younger mean age (33.3 ± 11.1 vs 49.3 ± 16.4, P < 0.001), lower ALT levels (263.1 ± 200.9 vs 1264.2 ± 706.8, P < 0.001) and male predominance (191/39 vs 46/18, P = 0.046). Conclusions: This study showed our reporting system over‐estimated the AHC diagnosis, which is also a common issue worldwide. Greater efforts are needed to establish appropriate reporting systems, as well as more supplemental methods to distinguish between prevalent and incident cases.  相似文献   
98.
Objective: The prevalence of abnormal behavioural responses to a variety of stimuli among individuals with autism has led researchers to examine whether physiological reactivity (PR) is typical in this population. This article reviewed studies assessing PR to sensory, social and emotional, and stressor stimuli in individuals with autism. Methods: Systematic searches of electronic databases identified 57 studies that met our inclusion criteria. Studies were analysed to determine: (a) participant characteristics; (b) physiological measures used; (c) PR to sensory, social and emotional or stressor stimuli; (d) the relation between PR and behavioural or psychological variables and (e) baseline physiological activity. A novel measure of methodological quality suitable for use with non-randomized, non-interventional, psychophysiological studies was also developed and applied. Results: Individuals with autism were found to respond differently than typically developing controls in 78.6%, 66.7% and 71.4% of sensory, social and emotional, and stressor stimulus classes, respectively. However, this extant literature is characterized by variable and inconsistent findings, which do not appear to be accounted for by varying methodological quality, making it difficult to determine what specific factors differentiate individuals with autism who present with atypical PR from those who do not. Conclusions: Despite this uncertainty, individual differences in PR are clearly present in autism, suggesting additional research is needed to determine the variables relating to PR among those with ASD and to examine the possible existence of physiological subtype responders in the population.  相似文献   
99.
Purpose: In this prospective study the early cognitive development of children born to women with epilepsy (n = 198) was assessed and compared to a group of children representative of the general population (n = 230). Methods: The children were assessed when younger than the age of 2 years using the Griffiths Mental Development Scales, either in their local participating hospital or in their home. The assessments were completed by an assessor who was blinded to whether the child’s mother had epilepsy and to antiepileptic drug type. Results: Children exposed to sodium valproate had a statistically significant increased risk of delayed early development in comparison to the control children. Linear regression analysis showed a statistically significant effect of sodium valproate exposure on the child’s overall developmental level that was not accounted for by confounding variables. Delayed early development is also noted for children within an ad hoc group of less commonly utilized antiepileptic drugs, although conclusions cannot be drawn due to the size of this group (n = 13). Children exposed to either carbamazepine or lamotrigine in utero did not differ significantly in their overall developmental ability. Differences noted in specific developmental areas for these two groups were not statistically significant after the control for confounders such as socioeconomic status and maternal IQ. Discussion: Women with epilepsy should be informed of the risks posed to their potential offspring prior to pregnancy to allow for informed decisions regarding treatment. Children exposed in utero to antiepileptic drugs should be monitored throughout childhood to allow for early intervention when necessary.  相似文献   
100.
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