全文获取类型
收费全文 | 834篇 |
免费 | 53篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 13篇 |
妇产科学 | 26篇 |
基础医学 | 57篇 |
口腔科学 | 22篇 |
临床医学 | 68篇 |
内科学 | 300篇 |
皮肤病学 | 49篇 |
神经病学 | 77篇 |
特种医学 | 14篇 |
外科学 | 156篇 |
综合类 | 10篇 |
预防医学 | 36篇 |
眼科学 | 8篇 |
药学 | 36篇 |
肿瘤学 | 36篇 |
出版年
2024年 | 1篇 |
2023年 | 11篇 |
2022年 | 14篇 |
2021年 | 31篇 |
2020年 | 30篇 |
2019年 | 37篇 |
2018年 | 46篇 |
2017年 | 36篇 |
2016年 | 29篇 |
2015年 | 36篇 |
2014年 | 51篇 |
2013年 | 45篇 |
2012年 | 90篇 |
2011年 | 74篇 |
2010年 | 48篇 |
2009年 | 38篇 |
2008年 | 53篇 |
2007年 | 51篇 |
2006年 | 27篇 |
2005年 | 36篇 |
2004年 | 32篇 |
2003年 | 34篇 |
2002年 | 20篇 |
2001年 | 4篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1983年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有910条查询结果,搜索用时 468 毫秒
31.
Harry H. Gibbs Artur M. Spokojny Thomas J. Molloy Mazen O. Kamen Timothy A. Sanborn 《Catheterization and cardiovascular interventions》1993,30(1):37-39
Angioplasty of anomalous coronary arteries presents unique technical challenges. Correct guiding catheter selection is important to ensure adequate access to the anomalous vessel and to provide support to cross the lesion. A case of successful PTCA of a lesion in an anomalous right coronary artery arising from the left main coronary artery is presented. © 1993 Wiiey-Liss, Inc. 相似文献
32.
Mona Ramadan Ahmed Abdelgawad Ahmed Elshemy Emad Sarawy Aly Emad Mahmoud Mazen Ahmed Abdel Aziz 《The Egyptian Heart Journal》2018,70(2):113-118
Objective
It is unknown whether adequacy of diabetic control, measured by hemoglobin A1c, is a predictor of adverse outcomes after coronary artery bypass grafting.Methods
From December 2013 to November 2015, 80 consecutive patients underwent primary isolated CABG surgery at national heart institute, their data were prospectively collected and they were classified according to their HbA1c level into two groups, Group (A): Forty patients with fair glycemic control (HbA1c below or equal to 7%), Group (B): Forty patients with poor glycemic control (HbA1c above 7%). Hospital morbidity, mortality and one year survival were examined in both groups. Telephone conversation was used to call patients or their relatives to determine the one year survival and it was 100% complete. This study had gained the ethical approval from national heart institute ethical committee.Results
In-hospital mortality for group A was 2.5% (one patient) and 7.5% (3 patients) for group B with no statistical significance. One year mortality was (5.13%) (2 patients for group A) and (8.11%) (3 patients) for group B with no statistical significance. As regard the morbidity there was no statistical significance between the two groups in the incidence of neurological complications whether stroke or coma, atrial fibrillation, postoperative myocardial infarction, low cardiac output syndrome, heart failure, renal failure, need for dialysis, deep sternal wound infection, and readmission. However, group B had lengthy hospital stay, lengthy ventilation hours, more respiratory complications, and more superficial wound infection with a statistical significance when compared to group A, P values were 0.003, 0.003, 0.038, 0.044 respectively.Conclusions
This study showed that HbA1c is a good predictor of in-hospital morbidity. It worth devoting time and effort to decrease HbA1c level below 7% to decrease possible postoperative complications. 相似文献33.
Taghreed Shams MBBS FRCSC Belal Firwana MD Farida Habib PhD Abeer Alshahrani MBBS Badria AlNouh MBBS Mohammad Hassan Murad MD Mazen Ferwana MD 《Journal of general internal medicine》2014,29(1):204-213
Background
Hot flashes are the most commonly reported vasomotor symptom during the peri- and early post-menopausal period.Objectives
To systematically review, appraise and summarize the evidence of the impact of different SSRIs on peri-menopausal hot flashes in healthy women in randomized, controlled trials.Methods
A comprehensive literature search was conducted of MEDLINE?, EMBASE, the Cochrane Central Register of Controlled Trials, Web of Science and Scopus through March 2013. Two independent reviewers selected studies and extracted data. Random effects meta-analysis was used to pool outcomes across studies, and Bayesian mixed treatment methods were used to rank SSRIs in terms of effectiveness.Results
We included a total of 11 randomized controlled trials with good methodological quality enrolling 2,069 menopausal and post-menopausal women (follow-up 1–9 months, mean age 36–76 years, mean time since menopause 2.3–6.6 years). Compared with placebo, SSRIs were associated with a statistically significant decrease in hot flash frequency (difference in means ?0.93; 95 % CI ?1.46 to ?0.37; I2 = 21 %) and severity assessed by various scales (standardized difference in means ?0.34; 95 % CI ?0.59 to ?0.10; I2 = 47 %). Adverse events did not differ from placebo. Mixed treatment comparison analysis demonstrated the superiority of escitalopram compared to other SSRIs in terms of efficacy.Conclusion
SSRI use is associated with modest improvement in the severity and frequency of hot flashes but can also be associated with the typical profile of SSRI adverse effects. 相似文献34.
Mazen M. Jamil Al-Obaidi Fouad Hussain Al-Bayaty Rami Al Batran Pouya Hassandarvish Elham Rouhollahi 《Archives of oral biology》2014
Objective
This study has attempted to evaluate the effects of ellagic acid (EA) on alveolar bone healing after tooth extraction in rats.Design
Twenty-four Sprague Dawley (SD) male rats (200–250 g) were selected and were anaesthetised for the extraction of upper left incisor. Then, the rats were divided into two groups, comprising 12 rats each; the first group has been considered as a control group and was given only normal saline, whereas, the second group (treated group) was intragastrically administrated with EA daily once, for 28 days. Then three rats from each group had been selected on 7th, 14th, 21st, and 28th days to dissect their maxilla tissue either for histological observation and homogenisation purposes. The tissues fixed, decalcified and embedded in paraffin. Serial sections of 5 μm thickness were prepared and stained with haematoxylin and eosin (H&E) for the histological study. Similar sections were taken for immunohistochemical analysis to assess osteocalcin (OSC) and osteopontin (OPN). Furthermore, Malondialdehyde (MDA) and superoxide dismutase (SOD) were measured in homogenated gingival maxilla tissue of rat by commercial kit.Results
Based on the histological analysis we have identified that, EA treatment has induced earlier trabecular bone deposition in the treated group, resulting in more organised bone matrix on the 14th, 21st, and 28th days after tooth extraction, as against the control group. In comparison to control group, the positive labelling of OSC and OPN of the treated group have been highly expressed in the alveolar socket on 14th, and 21st days, which has indicated a the possibility of formation of new bone trabeculae at the beginning of the mineralisation process, after tooth extraction. In the EA treatment group, lipid per-oxidation (MDA) was significantly decreased (P < 0.05), as opposed to the control group. However, the antioxidant defense enzyme (SOD) was significantly increased in the maxilla tissue treated with EA (P < 0.05), compared to control group, which suggests that, after tooth extraction, EA plays an important role in the protection against the induction of lipid per-oxidation, particularly after 28 days of treatment with EA.Conclusion
This study has concluded that, EA may accelerated the healing process in teeth socket of rats. Furthermore, the EA treated group showed a stronger positive immunolabelling for OSC and OPN, when compared with the control group. 相似文献35.
Ahmed Eltarras Youssef Jalloul Ola Assaad Michael Bejjani Yara Yammine Nina Khatib Abdallah Rebeiz Mazen El Sayed Marwan Refaat 《老年心脏病学杂志》2021,18(6):416-425
BACKGROUNDIn-hospital cardiac arrest (IHCA) constitutes a significant cause of morbidity and mortality. As data is scarce in the Middle East and Lebanon, we devised this study to shed some light on it to better inform both hospitals and policymakers about the magnitude and quality of IHCA care in Lebanon.METHODSWe analyzed retrospective data from 680 IHCA events at the American University of Beirut Medical Center between July 1, 2016 and May 2, 2019. Sociodemographic variables included age and sex, in addition to the comorbidities listed in the Charlson comorbidity index. IHCA event variables were day, event location, time from activation to arrival, initial cardiac rhythm, and the total number of IHCA events. We also looked at the months and years. We considered the return of spontaneous circulation (ROSC) and survival to discharge (StD) to be our outcomes of interest.RESULTSThe incidence of IHCA was 6.58 per 1,000 hospital admissions (95% CI: 6.09−7.08). Non-shockable rhythms were 90.7% of IHCAs. Most IHCA cases occurred in the closed units (87.9%) (intensive care unit, respiratory care unit, neurology care unit, and cardiology care unit) and on weekdays (76.5%). ROSC followed more than half the IHCA events (56%). However, only 5.4% of IHCA events achieved StD. Both ROSC and StD were higher in cases with a shockable rhythm. Survival outcomes were not significantly different between day, evening, and nightshifts. ROSC was not significantly different between weekdays and weekends; however, StD was higher in events that happened during weekdays than weekends (6.7%vs. 1.9%, P = 0.002). CONCLUSIONSThe incidence of IHCA was high, and its outcomes were lower compared to other developed countries. Survival outcomes were better for patients who had a shockable rhythm and were similar between the time of day and days of the week. These findings may help inform hospitals and policymakers about the magnitude and quality of IHCA care in Lebanon.In-hospital cardiac arrest (IHCA) constitutes a significant cause of morbidity and mortality.[1] Based on the American Heart Association’s Get With The Guidelines-Resuscitation (GWTG-R) registry data from 2003 to 2007, the approximated incidence of IHCAs in the United States was 211,000 annually or roughly 6 to 7 cardiac arrests per 1,000 hospital admissions.[2,3] Data from 2008 to 2017 showed the incidence of IHCA increased to 292,000 annually or 9 to 10 IHCAs per 1,000 hospital admissions.[1,4] In contrast, data from the United Kingdom National Cardiac Arrest Audit showed an incidence of 1.6 IHCAs per 1,000 hospital admissions in the United Kingdom from 2011 to 2013.[1] Despite progress in resuscitation technology and care, survival outcomes following IHCA remain low at 15%−25% and vary radically between 0% and 42% worldwide.[5,6] Sandroni, et al.[5] showed that various patient and healthcare-related factors are associated with the survival outcomes of IHCA. The main patient-related factors are age, sex, initial cardiac rhythm, underlying medical condition, comorbidities, and the time of the IHCA event. In contrast, major healthcare-related factors are the protocols for IHCA care, duration and method of resuscitation, skills of healthcare professionals, time from code activation and the arrival of the code response team, and the location of the IHCA event.[5,7] The study by Chen, et al.[8] suggests that improving the quality of resuscitation care and minimizing other healthcare-related risk factors can markedly increase survival outcomes from IHCAs.[6,9]Consistent and updated estimates of the magnitude and outcomes of IHCA are fundamental for monitoring and improving the delivery and quality of IHCA care in any healthcare setting. In Lebanon, studies have shown low survival rates (5.5%) from out-of-hospital cardiac arrest.[10]The reported incidence of IHCA in the United Arab Emirates was 11.7 per 1,000 hospital admissions,[6] and in Saudi Arabia was 7.76 per 1,000 hospital admissions.[11] The reported survival to hospital discharge in the United States was only 10.4%,[12] and it was only 7.9% in the United Kingdom.[13] However, unlike European countries and the United States, the epidemiology of IHCA is unknown in Lebanon, suggesting the need for research in this area. Therefore, this study aimed to produce the first estimates of the incidence, characteristics, and outcomes of IHCA at a tertiary-care hospital in Lebanon. 相似文献
36.
Nohra Ghaoui MD Edith Hanna MD Ossama Abbas MD Abdul-Ghani Kibbi MD Mazen Kurban MD 《International journal of dermatology》2020,59(7):787-795
Dapsone (4,4'-diaminodiphenylsulfone) is the only remaining sulfone used in anthropoid therapeutics and is commercially available as an oral formulation, an inhaled preparation, and a 5% or 7.5% cream. Dapsone has antimicrobial effects stemming from its sulfonamide-like ability to inhibit the synthesis of dihydrofolic acid. It also has anti-inflammatory properties such as inhibiting the production of reactive oxygen species, reducing the effect of eosinophil peroxidase on mast cells and down-regulating neutrophil-mediated inflammatory responses. This allows for its use in the treatment of a wide variety of inflammatory and infectious skin conditions. Currently in dermatology, the US Food and Drug Administration (FDA)-approved indications for dapsone are leprosy, dermatitis herpetiformis, and acne vulgaris. However, it proved itself as an adjunctive therapeutic agent to many other skin disorders. In this review, we discuss existing evidence on the mechanisms of action of dapsone, its FDA-approved indications, off-label uses, and side effects. 相似文献
37.
38.
Margaret A. DiGuardo Jaime I. Davila Rory A. Jackson Asha A. Nair Numrah Fadra Kay T. Minn Mazen A. Atiq Shabnam Zarei Joseph H. Blommel Shannon M. Knight Jin Jen Bruce W. Eckloff Jesse S. Voss Kandelaria M. Rumilla Sarah E. Kerr Dora M. Lam-Himlin Andrew M. Bellizzi Rondell P. Graham Kevin C. Halling 《The Journal of molecular diagnostics : JMD》2021,23(5):555-564
39.
Brian A. Boone Jennifer Steve Mazen S. Zenati Melissa E. Hogg Aatur D. Singhi David L. Bartlett Amer H. Zureikat Nathan Bahary Herbert J. Zeh III 《Annals of surgical oncology》2014,21(13):4351-4358
Background
Baseline carbohydrate antigen 19-9 (CA 19-9) is a useful prognostic marker in pancreatic ductal adenocarcinoma (PDA); however, data on the significance of a change in CA 19-9 following neoadjuvant therapy are lacking.Methods
All patients receiving neoadjuvant therapy for PDA from July 2010 to February 2013 were retrospectively reviewed. Resection rate, R0 resection rate, need for venous resection, and overall survival were correlated to CA 19-9 response. Fisher’s exact test, Kaplan–Meier survival analysis, and multivariate analysis using Cox regression were used.Results
A total of 78 patients were studied (21 patients with resectable disease, 40 borderline resectable, and 17 with locally advanced disease). A variety of chemotherapies ± radiation were utilized during the study period. Overall, 56 patients (72 %) had a decrease in CA 19-9 of >50 % with neoadjuvant treatment. In borderline resectable patients, CA 19-9 response of >50 % predicted R0 resection (odds ratio 4.2; p = 0.05). In borderline resectable patients who had an increase in CA 19-9, none of five (0 %) underwent R0 resection compared with 80 % of the remaining cohort (p = 0.001). The complete pathologic response rate was 29 % in patients who had a CA 19-9 response of >90 % versus 0 % in the remaining patients (p < 0.001). A CA 19-9 response of >50 % resulted in improved overall survival (28.0 vs. 11.1 months; p < 0.0001) and was an independent predictor of survival (hazard ratio 0.26; 95 % CI 0.13–0.55; p < 0.0001).Conclusions
CA 19-9 response to neoadjuvant therapy is associated with R0 resection rate, histopathologic response, and survival. Incorporation of this easily obtainable biomarker into future clinical trials may facilitate more rapid evaluation of novel regimens. 相似文献40.
Pain is a common symptom in multiple sclerosis (MS) and has recently been estimated to be experienced by up to 75 % of patients. Pain can be present at any point in the course of the disease and patients may experience pain from various causes simultaneously. Pain in MS can also be secondary to other symptoms, such as spasticity, fatigue, and mood disorder. Of all drug use to treat MS symptoms, treatment for pain accounts for nearly 30 % of total use. At the same time, patients report low satisfaction with pain management. Pain affects quality of life and can influence a person’s participation in family life and work and affect mood. Most of the pain literature in the field of MS is based on open-label studies involving small numbers of subjects. Placebo-controlled trials in severe pain syndromes such as trigeminal neuralgia are unethical but for other types of MS-related pain conditions, placebo-controlled trials are ethical and necessary to establish efficacy, particularly given the well-documented placebo effect for various painful conditions This review discusses available data and emphasizes areas of pain research that require further attention 相似文献