收费全文 | 4297篇 |
免费 | 400篇 |
国内免费 | 9篇 |
耳鼻咽喉 | 126篇 |
儿科学 | 310篇 |
妇产科学 | 187篇 |
基础医学 | 322篇 |
口腔科学 | 314篇 |
临床医学 | 430篇 |
内科学 | 908篇 |
皮肤病学 | 84篇 |
神经病学 | 326篇 |
特种医学 | 246篇 |
外科学 | 758篇 |
综合类 | 44篇 |
一般理论 | 1篇 |
预防医学 | 134篇 |
眼科学 | 139篇 |
药学 | 257篇 |
中国医学 | 5篇 |
肿瘤学 | 115篇 |
2024年 | 11篇 |
2023年 | 103篇 |
2022年 | 69篇 |
2021年 | 195篇 |
2020年 | 130篇 |
2019年 | 185篇 |
2018年 | 261篇 |
2017年 | 199篇 |
2016年 | 276篇 |
2015年 | 248篇 |
2014年 | 318篇 |
2013年 | 477篇 |
2012年 | 257篇 |
2011年 | 253篇 |
2010年 | 214篇 |
2009年 | 143篇 |
2008年 | 179篇 |
2007年 | 137篇 |
2006年 | 159篇 |
2005年 | 174篇 |
2004年 | 96篇 |
2003年 | 76篇 |
2002年 | 76篇 |
2001年 | 55篇 |
2000年 | 69篇 |
1999年 | 56篇 |
1998年 | 53篇 |
1997年 | 50篇 |
1996年 | 46篇 |
1995年 | 34篇 |
1994年 | 24篇 |
1993年 | 25篇 |
1992年 | 8篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 6篇 |
1988年 | 3篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1980年 | 1篇 |
1978年 | 3篇 |
1974年 | 2篇 |
1972年 | 1篇 |
1962年 | 1篇 |
1960年 | 1篇 |
1947年 | 1篇 |
1935年 | 1篇 |
Methods: Maternal and fetal serum copeptin levels were measured in 21 women with pregnancies complicated by isolated FGR and 20 women with normal pregnancies (control group). Doppler assessment of the uterine and umbilical arteries was performed in each patient.
Results: Maternal serum copeptin levels were significantly higher in women with isolated FGR compared to controls (p?=?0.042). In addition, maternal copeptin levels were inversely correlated with the uterine artery pulsatility and resistance indices and positively correlated with neonatal birth weight. Umbilical vein copeptin levels were significantly increased in neonates with adverse outcomes (p?=?0.001).
Conclusions: Increased maternal copeptin concentration may reflect a response to stress, thus serving as a compensatory mechanism in pregnancies complicated by FGR. 相似文献
Background
Haematological cancer (HC) patients are increasingly requiring intensive care (ICUs). The aim of this study was to investigate the outcome of HC patients in our ICU and evaluate 5 days-full support as a breakpoint for patients’ re-assessment for support.Methods
Retrospective study enrolling 112 consecutive HC adults, requiring ICU in January-December 2015. Patients’ data were collected from medical records and Infection Control Committee surveillance reports. Logistic regression analysis was performed to identify independent risk factors for ICU mortality.Results
Sixty-one were neutropenic, and 99 (88%) had infection at ICU admission. Acute myeloid leukaemia was diagnosed in 43%. Thirty-five (31%) were hematopoietic stem cell transplant recipients. Only 17 (15%) were in remission. Eighty-nine underwent mechanical ventilation on admission. Fifty-three patients acquired ICU-infection (35 bacteremia) being gram negative bacteria (Klebsiella pneumoniae and non-fermenters) the top pathogens. However, ICU-acquired infection had no impact on mortality. The overall ICU and 1-year survival rate was 27% (30 patients) and 7% (8 patients), respectively. Moreover, only 2/62 patients survived with APACHE II score ≥25. The median time for death was 4 days. APACHE II score ≥25 [OR:35.20], septic shock [OR:8.71] and respiratory failure on admission [OR:10.55] were independent risk factors for mortality in multivariate analysis. APACHE II score ≥25 was a strong indicator for poor outcome (ROC under curve 0.889).Conclusions
APACHE II score ≥25 and septic shock were criteria of ICU futility. Our findings support the full support of patients for 5 days and the need to implement a therapeutic limitations protocol. 相似文献Purpose
The aim of our study is to research the role and efficacy of cerebral oximetry in predicting neurologic prognosis when applied during TTM to patients experiencing coma after CA.Methods
This study was performed on surviving adult comatose patients after CA treated with TTM. The average scores of rSO2 was measured at 6 h intervals for the first 2 days and once a day for the following 3 days with a NIRS device during TTM. The CPC scale was used to define the neurologic outcomes of patients. We compared the correlations of rSO2 values between good (CPC 1–2) and poor (CPC 3–5) neurologic outcomes in CA patients.Results
There was no statistically significant difference identified between the prognosis groups in terms of rSO2, CPR durations, hemoglobin values and admission body temperature (p > 0.05). When the variation in rSO2 values over time is investigated, though there was no significant difference between the good and poor prognosis groups, it appeared to fall in the first 6 h in both prognosis groups. The median NT-proBNP and lactate values were observed to be higher in the poor prognosis group.Conclusion
There is no significant correlation between rSO2 values and neurologic outcomes. Multimodal monitoring methods may be useful and further studies with a larger patient population are necessary in this area. 相似文献AIM
To investigate the association of serum glucocorticoid kinase gene-1 (SGK-1) DNA variants with chronic central serous chorioretinopathy (CSC).METHODS
We enrolled 32 eyes of 32 patients who were diagnosed with chronic CSC and composed 32 normal eyes as a control group. Peripheral blood was used for DNA extraction and polymerase chain reaction (PCR) amplification. SGK1 gene was sequenced by using BigDye® Terminator v3.1 cycle sequencing KIT (Applied Biosystems, Foster City, CA, USA). The SGK1 gene and its variants were investigated in CSC patient group and control group.RESULTS
We identified a new polymorphism M32V in two person in the patient group (Minor allele frequency (MAF)=0.009) on the region of 1-60 amino acids. The rs1057293 was located in the encoder region of the SGK 1 gene but not associated with CSC (P=0.68). An intrinsic rs1743966 is also not associated (P=0.28).CONCLUSIONS
The new polymorphism M32V is located on the region of 1-60 amino acids which is necessary for localization to the mitochondria in CSC patient. This mutation is probably important for the energy metabolism and plays an important role in the cellular response to hyperosmotic stress and other stress stimuli. Both rs1057293 and rs1743966 are not associated with CSC. 相似文献Antiphospholipid syndrome (APS) is a systemic autoimmune disorder characterized by arterial and/ or venous thrombosis accompanied by persistently elevated levels of antiphospholipid antibodies (aPLs). The aim of this study is to evaluate the pulmonary manifestations of APS and compare the levels of aPLs in patients with and without pulmonary involvement. We retrospectively reviewed the files of patients with the diagnosis of APS between October 2010 and May 2017. Demographic data, clinical, radiological and laboratory findings were recorded. The study included 67 patients (56 female/11 male) with a mean age of 39?±?13 years. Pulmonary manifestations such as parenchymal and/or vascular involvement were seen in 12 (17.9%) patients. The patients with and without pulmonary manifestations were not significantly different in terms of age (p?=?0.46), comorbidities (p?=?0.48) and APS duration (p?=?0.66). Acute pulmonary thromboembolism (PE) was determined in 11 (16.4%), alveolar hemorrhage in 2 (3%) patients. Four patients with acute PE (36%) developed chronic thromboembolic pulmonary hypertension (CTEPH). One patient developed both CTEPH and diffuse alveolar hemorrhage after acute PE during follow up. Antiphosholipid antibody IgM was highly positive in patients with PE compared to patients without PE (p?=?0.005). Other antibodies and lupus anticoagulant were not significantly different in patients with and without PE. None of the patients were deceased due to pulmonary manifestations of APS. PE was the most common pulmonary manifestation of APS. The development of CTEPH was high among APS patients. Patients with APS should be closely followed for the onset of PE and CTEPH.
相似文献