全文获取类型
收费全文 | 1046篇 |
免费 | 92篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 44篇 |
妇产科学 | 120篇 |
基础医学 | 117篇 |
口腔科学 | 58篇 |
临床医学 | 90篇 |
内科学 | 203篇 |
皮肤病学 | 20篇 |
神经病学 | 34篇 |
特种医学 | 31篇 |
外科学 | 151篇 |
综合类 | 34篇 |
预防医学 | 72篇 |
眼科学 | 30篇 |
药学 | 67篇 |
中国医学 | 1篇 |
肿瘤学 | 46篇 |
出版年
2023年 | 11篇 |
2022年 | 30篇 |
2021年 | 50篇 |
2020年 | 12篇 |
2019年 | 18篇 |
2018年 | 32篇 |
2017年 | 18篇 |
2016年 | 33篇 |
2015年 | 37篇 |
2014年 | 29篇 |
2013年 | 39篇 |
2012年 | 73篇 |
2011年 | 58篇 |
2010年 | 40篇 |
2009年 | 44篇 |
2008年 | 67篇 |
2007年 | 58篇 |
2006年 | 50篇 |
2005年 | 45篇 |
2004年 | 51篇 |
2003年 | 32篇 |
2002年 | 42篇 |
2001年 | 22篇 |
2000年 | 24篇 |
1999年 | 22篇 |
1998年 | 8篇 |
1996年 | 4篇 |
1995年 | 5篇 |
1994年 | 8篇 |
1993年 | 4篇 |
1992年 | 12篇 |
1991年 | 12篇 |
1990年 | 4篇 |
1989年 | 7篇 |
1988年 | 14篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1980年 | 7篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1974年 | 11篇 |
1973年 | 12篇 |
1972年 | 5篇 |
1971年 | 5篇 |
1969年 | 6篇 |
排序方式: 共有1143条查询结果,搜索用时 15 毫秒
41.
S Dunica J C Piette N Nassar P Beaufils 《Archives des maladies du coeur et des vaisseaux》1986,79(8):1251-1255
A young man developed syncopal complete paroxysmal atrioventricular block (AVB) over a 36 hour period, on a background of 1st degree AVB which persisted for 6 weeks. During the 3rd week, electrophysiological studies showed an isolated prolonged AH interval. This episode followed skin and articular manifestations occurring one month after being bitten by a tick in Corsica. The clinical picture suggested Lyme's disease which was confirmed serologically. This condition transmitted bu Ixodes ricinus, a tick present in country districts, is due to spirochetal infection. It is characterized by a chronic migrating erythema, and may sometimes be complicated by severe AV conduction defects which are always regressive, as in our case. 相似文献
42.
Symptomatic hypocalcemia has been reported infrequently in association with magnesium sulfate (MgSO (4)) tocolytic therapy. We report a 38-year-old woman who presented in preterm labor at 24 3/7 weeks. Twenty hours after starting MgSO (4), she developed chest pain. Studies revealed therapeutic serum Mg level, total serum calcium (Ca) = 5.5 mg/dL, 24-hour urine Ca = 763.9 mg, and low serum uric acid and phosphate levels. All studies corrected day 1 postpartum; urine Ca level corrected on day 2. Even short courses of MgSO (4) can result in severe hypocalcemia, raising the question of whether Ca levels should be routinely monitored. 相似文献
43.
Usta IM Hamdi MA Musa AA Nassar AH 《Acta obstetricia et gynecologica Scandinavica》2007,86(2):172-176
BACKGROUND: To review the outcome of subsequent pregnancies in conservatively managed cases of uterine rupture. METHODS: Charts of patients with full thickness uterine rupture in the past 25 years were reviewed and information on subsequent pregnancies was extracted from maternal and neonatal charts. RESULTS: Thirty-seven patients with uterine rupture were identified; the uterus was scarred in 62.2%. Ruptures were repaired in 26 (70.3%). Twelve patients subsequently conceived (24 pregnancies), with recurrence in 8/24 (33.3%) pregnancies or 5/12 (41.7%) patients. Patients with recurrence had a shorter median interval from previous rupture (2 versus 5 years), a higher incidence of previous longitudinal ruptures (60.0% versus 0.0%), and the median gestational age at the preceding rupture was lower without reaching statistical significance (34 versus 38 weeks; p = 0.209). CONCLUSIONS: Longitudinal ruptures and short intervals between rupture and subsequent pregnancy predispose to recurrence of uterine rupture. 相似文献
44.
Mohammed Ahmed Megahed Sherief Mohamed El Kashty Ahmed Tharwat Nassar Mohamed Aboulfetouh Mohammed Saad AboShaban 《Indian Journal of Plastic Surgery》2022,55(1):81
Background The ideal skin substitute should be more similar to normal skin function while causing fewer reactions. The purpose of this study was to assess the effect of radiotherapy on minimizing acute rejection and enhancing wound healing in children with deep burns. Patients and Methods A prospective randomized control study included 34 children admitted to the burn unit with deep burns under the age of 12 years. Through the tomotherapy device, a skin homograft from a related living donor was exposed to a local dose of radiotherapy of 500 centigray (cGy). It was immediately used for coverage of the prepared bed after the irradiation was completed. Results The mean values of the laboratory parameters (ESR, CRP, IL-6, and TNF) for all burn patients in the study showed a significant difference, with p < 0.001. The mean ± standard deviation (SD) of the time from homograft coverage to the appearance of rejection was 9.62 ± 1.45 in group 1 and 14.35 ± 2.8 in group 2, with p < 0.001 (highly significant difference), indicating that exposure to radiotherapy can reduce graft rejection. Conclusions The exposure of skin homografts from related living donors to a local low dose of radiotherapy can reduce a graft''s ability to initiate inflammatory and immunological reactions, thereby minimizing rejection of a graft and enhancing epithelialization in children with deep second- and third-degree burns. 相似文献
45.
Mahmoud Nassar Nso Nso Sofia Lakhdar Ravali Kondaveeti Chandan Buttar Harangad Bhangoo Mahmoud Awad Naveen Siddique Sheikh Karim M Soliman Most Sirajum Munira Farshid Radparvar Vincent Rizzo Ahmed Daoud 《World Journal of Transplantation》2022,12(3):42-54
It has been reported that up to 90% of organ transplant recipients have suboptimal blood pressure control. Uncontrolled hypertension is a well-known culprit of cardiovascular and overall morbidity and mortality. In addition, rigorous control of hypertension after organ transplantation is a crucial factor in prolonging graft survival. Nevertheless, hypertension after organ transplantation encompasses a broader range of causes than those identified in non-organ transplant patients. Hence, specific management awareness of those factors is mandated. An in-depth understanding of hypertension after organ transplantation remains a debatable issue that necessitates further clarification. This article provides a comprehensive review of the prevalence, risk factors, etiology, complications, prevention, and management of hypertension after organ transplantation. 相似文献
46.
OBJECTIVE: The aim of the study was to assess the rate of acceptance of preimplantation genetic diagnosis (PGD) as an alternative to prenatal diagnosis in Lebanese women with previously affected children with homozygous beta-thalassemia. METHODS: Women with a previously affected child attending a nongovernmentally funded thalassemia care center between 1 June 2005 and 31 May 2007 were offered a genetic counseling session. This was followed by administering a questionnaire through direct interview. RESULTS: All 97 women approached accepted to participate in the study (100% response rate). Sixty eight per cent of women considered PGD a better alternative to prenatal diagnosis. The most important perceived advantage of PGD was the avoidance of termination of an affected pregnancy. CONCLUSIONS: PGD is an acceptable alternative to conventional prenatal diagnosis in women at risk of conceiving a child affected with beta-thalassemia. This is particularly true in countries of the Middle-East where therapeutic abortions for fetal indications are prohibited by the law and religion. Copyright (c) 2008 John Wiley & Sons, Ltd. 相似文献
47.
48.
Quarello E Stirnemann J Nassar M Nasr B Bernard JP Leleu-Huard F Ville Y 《BJOG : an international journal of obstetrics and gynaecology》2008,115(5):595-601
Objective To evaluate the outcome of severely anaemic monochorionic (MC) twins surviving the death of their co-twin following early intrauterine rescue transfusion in cases of feto-fetal transfusion syndrome (FFTS).
Study design We reviewed all MC pregnancies complicated with FFTS following primary management, in which a single intrauterine fetal death (IUFD) was diagnosed with certainty within 24 hours between January 1999 and December 2006. We included MC survivors who presented ultrasound or Doppler features of fetal anaemia following the death of their co-twin. Intrauterine transfusion (IUT) was given to all survivors who were anaemic.
Results Nineteen MC twin pregnancies presented a single intrauterine death (IUD) associated with an anaemic co-twin. Median gestational age at IUD was 23 [20–28] weeks. The median interval between IUD and IUT was 12 [8–24] hours. There were 58% (11/19) healthy survivors. Perinatal death rate was 26% (5/19) including 16% (3/19) intrauterine and 10% (2/19) neonatal deaths. Abnormal prenatal cerebral findings developed in 21% (4/19) cases, always within 1 month after the death of the co-twin. Considering occlusive techniques and other management separately, there were 64% (7/11) and 50% (4/8) healthy survivors, respectively, and perinatal death occurred in 36% (4/11) and 12.5% (1/8) of fetuses, respectively. Prenatal fetal cerebral lesions developed in 9% (1/11) of cases following occlusive techniques and in 37.5% (3/8) of fetuses when managed differently. The median gestational age at delivery in the survivors was 31 [25–38] weeks.
Conclusion In cases of FFTS with single anaemic survivors, early IUT could be offered following extensive counselling and close follow up. 相似文献
Study design We reviewed all MC pregnancies complicated with FFTS following primary management, in which a single intrauterine fetal death (IUFD) was diagnosed with certainty within 24 hours between January 1999 and December 2006. We included MC survivors who presented ultrasound or Doppler features of fetal anaemia following the death of their co-twin. Intrauterine transfusion (IUT) was given to all survivors who were anaemic.
Results Nineteen MC twin pregnancies presented a single intrauterine death (IUD) associated with an anaemic co-twin. Median gestational age at IUD was 23 [20–28] weeks. The median interval between IUD and IUT was 12 [8–24] hours. There were 58% (11/19) healthy survivors. Perinatal death rate was 26% (5/19) including 16% (3/19) intrauterine and 10% (2/19) neonatal deaths. Abnormal prenatal cerebral findings developed in 21% (4/19) cases, always within 1 month after the death of the co-twin. Considering occlusive techniques and other management separately, there were 64% (7/11) and 50% (4/8) healthy survivors, respectively, and perinatal death occurred in 36% (4/11) and 12.5% (1/8) of fetuses, respectively. Prenatal fetal cerebral lesions developed in 9% (1/11) of cases following occlusive techniques and in 37.5% (3/8) of fetuses when managed differently. The median gestational age at delivery in the survivors was 31 [25–38] weeks.
Conclusion In cases of FFTS with single anaemic survivors, early IUT could be offered following extensive counselling and close follow up. 相似文献
49.
Effect of narghile and cigarette smoking on newborn birthweight 总被引:1,自引:1,他引:0
Tamim H Yunis KA Chemaitelly H Alameh M Nassar AH;National Collaborative Perinatal Neonatal Network Beirut Lebanon 《BJOG : an international journal of obstetrics and gynaecology》2008,115(1):91-97
Objective To assess the effect of narghile smoking on the weight of newborns.
Design Historical retrospective cohort.
Setting Six major hospitals in Greater Beirut, Lebanon.
Population Consecutive singleton newborns delivered from August 2000 to August 2003.
Methods Obstetric and nursery charts were reviewed to obtain information about maternal and neonatal variables. Information concerning initiation of smoking, dose of smoking, smoking habits during pregnancy, and socio-demographic characteristics was collected through interviews with mothers.
Main outcome measures Low birthweight and newborn birthweight.
Results Exclusive narghile smokers constituted 4.4% (378/8592) of women. Multiparas were significantly more likely to smoke cigarettes and narghile. Mothers smoking narghile more than once per day were at 2.4 increased odds of having low birthweight infants compared with nonsmoking mothers (OR 2.4; 95% CI 1.2–5.0) after adjusting for confounding variables. No difference was noted between women smoking narghile in the first trimester and those initiating smoking in subsequent trimesters regarding low birthweight.
Conclusions Narghile smoking more than once per day increases the odds of low birthweight by a 2.4-fold compared with nonsmokers, although to a lesser extent than cigarette smoking. 相似文献
Design Historical retrospective cohort.
Setting Six major hospitals in Greater Beirut, Lebanon.
Population Consecutive singleton newborns delivered from August 2000 to August 2003.
Methods Obstetric and nursery charts were reviewed to obtain information about maternal and neonatal variables. Information concerning initiation of smoking, dose of smoking, smoking habits during pregnancy, and socio-demographic characteristics was collected through interviews with mothers.
Main outcome measures Low birthweight and newborn birthweight.
Results Exclusive narghile smokers constituted 4.4% (378/8592) of women. Multiparas were significantly more likely to smoke cigarettes and narghile. Mothers smoking narghile more than once per day were at 2.4 increased odds of having low birthweight infants compared with nonsmoking mothers (OR 2.4; 95% CI 1.2–5.0) after adjusting for confounding variables. No difference was noted between women smoking narghile in the first trimester and those initiating smoking in subsequent trimesters regarding low birthweight.
Conclusions Narghile smoking more than once per day increases the odds of low birthweight by a 2.4-fold compared with nonsmokers, although to a lesser extent than cigarette smoking. 相似文献
50.