全文获取类型
收费全文 | 3489篇 |
免费 | 205篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 53篇 |
儿科学 | 99篇 |
妇产科学 | 59篇 |
基础医学 | 415篇 |
口腔科学 | 408篇 |
临床医学 | 369篇 |
内科学 | 696篇 |
皮肤病学 | 90篇 |
神经病学 | 174篇 |
特种医学 | 104篇 |
外科学 | 404篇 |
综合类 | 36篇 |
预防医学 | 421篇 |
眼科学 | 33篇 |
药学 | 222篇 |
中国医学 | 26篇 |
肿瘤学 | 94篇 |
出版年
2023年 | 38篇 |
2022年 | 92篇 |
2021年 | 147篇 |
2020年 | 109篇 |
2019年 | 110篇 |
2018年 | 136篇 |
2017年 | 83篇 |
2016年 | 111篇 |
2015年 | 132篇 |
2014年 | 171篇 |
2013年 | 245篇 |
2012年 | 243篇 |
2011年 | 277篇 |
2010年 | 159篇 |
2009年 | 138篇 |
2008年 | 156篇 |
2007年 | 164篇 |
2006年 | 141篇 |
2005年 | 133篇 |
2004年 | 123篇 |
2003年 | 102篇 |
2002年 | 84篇 |
2001年 | 60篇 |
2000年 | 46篇 |
1999年 | 44篇 |
1998年 | 28篇 |
1997年 | 30篇 |
1996年 | 20篇 |
1995年 | 12篇 |
1994年 | 25篇 |
1993年 | 19篇 |
1992年 | 24篇 |
1991年 | 32篇 |
1990年 | 16篇 |
1989年 | 16篇 |
1988年 | 24篇 |
1987年 | 11篇 |
1986年 | 8篇 |
1985年 | 20篇 |
1984年 | 15篇 |
1983年 | 12篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1977年 | 7篇 |
1976年 | 9篇 |
1973年 | 6篇 |
1970年 | 6篇 |
1969年 | 5篇 |
1952年 | 16篇 |
1951年 | 23篇 |
排序方式: 共有3703条查询结果,搜索用时 15 毫秒
31.
Karen S. Mitchell Stephanie Y. Wells Adell Mendes Patricia A. Resick 《Journal of traumatic stress》2012,25(5):535-542
Eating disorders and posttraumatic stress disorder (PTSD) are debilitating conditions that frequently co‐occur. Although the two disorders have different clinical presentations, they share associated features, including cognitive disturbances, emotion dysregulation, dissociation, and impulsivity. We hypothesized that reductions in PTSD symptoms following cognitive processing therapy (CPT) and its treatment components (CPT without the written account or the written account only) would be associated with improvements in symptoms common to PTSD and eating disorders. Participants in the current investigation included women with PTSD (N = 65) who reported a history of rape or physical assault, were in a randomized dismantling study of CPT, and completed the Eating Disorder Inventory‐2 (EDI‐2) at pre‐ and posttreatment. Latent growth modeling results indicated that decreases in PTSD symptom scores were significantly associated with reductions in the Impulse Regulation, Interoceptive Awareness, Interpersonal Distrust, Ineffectiveness, and Maturity Fears subscales of the EDI‐2. Thus, PTSD treatment affected symptoms shared by PTSD and eating disorders. Currently, there are no clear guidelines for treatment of comorbid PTSD and eating disorders. Traditional CPT may impact symptoms common to both, but additional therapy may be needed for specific disordered eating attitudes and behaviors. 相似文献
32.
目的观察艾瑞昔布超前镇痛用于脊柱手术对患者术后镇痛效果的影响。方法选取本院2017年3月~2018年3月收治的110例脊柱手术患者,按随机数表法分为观察组与对照组,各55例。观察组术前30 min口服100 mg的艾瑞昔布,对照组口服相同剂量的安慰剂。术毕予负荷剂量的芬太尼0.001 mg/kg。比较两组术后6 h与12 h的疼痛程度[采用视觉模拟评分法(VAS)评估]、镇静效果(采用Ramesay评分法评估)、芬太尼消耗量、自控按压总次数、不良反应总发生率。结果观察组术后6 h与术后12 h的术后疼痛VAS评分分别为(2.80±0.82)分与(1.85±0.45)分,低于对照组的(3.15±0.91)分与(2.32±0.64)分;观察组的镇静Ramesay评分分别为(2.28±0.59)分与(2.06±0.58)分,低于对照组的(2.63±0.71)分与(2.33±0.70)分,差异有统计学意义(P0.05)。观察组术后0~6 h、6~12 h、12~24 h的芬太尼消耗量及自控按压总次数均低于对照组(P0.05)。观察组的不良反应总发生率为7.27%,低于对照组的21.82%(P0.05)。结论脊柱手术患者采用艾瑞昔布进行超前镇痛可获得良好的术后镇痛效果与镇静效果,芬太尼用量与不良反应均明显减少,具有较高的有效性与安全性,值得推广。 相似文献
33.
William A. Marston MD ; Anton Usala MD ; Ronald S. Hill PhD ; Robert Mendes MD ; Mary-Ann Minsley RN 《Wound repair and regeneration》2005,13(3):243-247
A novel injectable scaffolding matrix (E-Matrix) has been developed to accelerate wound healing in diabetic foot ulcers. This porcine collagen-derived matrix is designed to mimic tertiary embryonic connective tissue and to stimulate fetal wound repair mechanisms including angiogenesis. In vitro and animal studies have indicated a beneficial effect on tissue growth and an acceptable safety profile. In this report, we describe the initial use of this product in a pilot study of six humans with chronic nonhealing diabetic foot ulcers. A dramatic initial response to injection was seen, with an average wound size reduction of 72% 2 weeks after injection. Randomized trials are underway to define the potential benefit of this new treatment modality for diabetic foot ulcers. 相似文献
34.
H Pickering R Bethune IA Eyre-Brook 《Annals of the Royal College of Surgeons of England》2009,91(3):W1-W2
A 57-year-old-man with a history of malaise, fever,night sweats and shortness of breath presented a diagnostic challenge to his medical team. He was pancytopaenic and had splenomegaly on admission but other investigations, including bone marrow aspiration, proved inconclusive. After the patient deteriorated clinically, the general surgical team was requested to perform a diagnostic splenectomy. The histology of this showed infection with visceral leishmaniasis. He recovered completely with Amphotericin treatment. Although this is a rare condition, particularly for the general surgeon, this case highlights the difficult position surgeons are often put in when performing major surgery diagnostically. 相似文献
35.
Ana Cristina Aoun Tannuri Nelson Elias Mendes Gibelli Rodrigo Luiz Pinto Romão 《Journal of pediatric surgery》2009,44(11):2083-1357
Purpose
Hepatectomy remains a complex operation even in experienced hands. The objective of the present study was to describe our experience in liver resections, in the light of liver transplantation, emphasizing the indications for surgery, surgical techniques, complications, and results.Methods
The medical records of 53 children who underwent liver resection for primary or metastatic hepatic tumors were reviewed. Ultrasonography, computed tomographic (CT) scan, and needle biopsy were the initial methods used to diagnose malignant tumors. After neoadjuvant chemotherapy, tumor resectability was evaluated by another CT scan. Surgery was performed by surgeons competent in liver transplantation. As in liver living donor operation, vascular anomalies were investigated. The main arterial anomalies found were the right hepatic artery emerging from the superior mesenteric artery and left hepatic artery from left gastric artery. Hilar structures were dissected very close to liver parenchyma. The hepatic artery and portal vein were dissected and ligated near their entrance to the liver parenchyma to avoid damaging the hilar vessels of the other lobe. During dissection of the suprahepatic veins, the venous infusion was decreased to reduce central venous pressure and potential bleeding from hepatic veins and the vena cava.Results
Fifty-three children with hepatic tumors underwent surgical treatment, 47 patients underwent liver resections, and in 6 cases, liver transplantation was performed because the tumor was considered unresectable. There were 31 cases of hepatoblastoma, with a 9.6% mortality rate. Ten children presented with other malignant tumors—3 undifferentiated sarcomas, 2 hepatocellular carcinomas, 2 fibrolamellar hepatocellular carcinomas, a rhabdomyosarcoma, an immature ovarian teratoma, and a single neuroblastoma. These cases had a 50% mortality rate. Six children had benign tumors—4 mesenchymal hamartoma, 1 focal nodular hyperplasia, and a mucinous cystadenoma. All of these children had a favorable outcome. Hepatic resections included 22 right lobectomies, 9 right trisegmentectomies, 8 left lobectomies, 5 left trisegmentectomies, 2 left segmentectomies, and 1 case of monosegment (segment IV) resection. The overall mortality rate was 14.9%, and all deaths were related to recurrence of malignant disease. The mortality rate of hepatoblastoma patients was less than other malignant tumors (P = .04).Conclusion
The resection of hepatic tumors in children requires expertise in pediatric surgical practice, and many lessons learned from liver transplantation can be applied to hepatectomies. The present series showed no mortality directly related to the surgery and a low complication rate. 相似文献36.
de Andrade AK Feist IS Pannuti CM Cai S Zezell DM De Micheli G 《Lasers in medical science》2008,23(4):341-347
The Nd:YAG laser efficacy associated with conventional treatment for bacterial reduction has been investigated throughout
literature. The purpose of this study was to evaluate the bacterial reduction after Nd:YAG laser irradiation associated with
scaling and root planning in class II furcation defects in patients with chronic periodontitis. Thirty-four furcation lesions
were selected from 17 subjects. The control group received conventional treatment, and the experimental group received the
same treatment followed by Nd:YAG laser irradiation (100 mJ/pulse; 15 Hz; 1.5 W, 60 s, 141.5 J/cm2). Both treatments resulted in improvements of most clinical parameters. A significant reduction of colony forming unit (CFU)
of total bacteria number was observed in both groups. The highest reduction was noted in the experimental group immediately
after the treatment. The number of dark pigmented bacteria and the percentage of patients with Porphyromonas gingivalis, Prevotella intermedia, and Actinobacillus actinomycetemcomitans reduced immediately after the treatment and returned to values close to the initial ones 6 weeks after the baseline for both
groups. The Nd:YAG laser associated with conventional treatment promoted significant bacterial reduction in class II furcation
immediately after irradiation, although this reduction was not observed 6 weeks after the baseline. 相似文献
37.
Fábio Viadanna Serráo Paula Regina Mendes da Silva Serráo Bernd Foerster Alberto Tannús Vanessa Monteiro Pedro Tania F. Salvini 《Journal of Sports Science and Medicine》2007,6(1):106-116
The objectives of this study were to propose a model for exercise- induced muscle injury by way of a maximal eccentric isokinetic exercise at low angular speed, and assess the time course of functional recovery of the injured quadriceps femoris muscle from the maximal voluntary contraction (MVC) torque and electrical activity (root mean square - RMS and median frequency - MDF). The effectiveness of the proposed eccentric exercise in inducing injury was assessed from the activity of creatine kinase (CK). In addition, the presence of edema of the quadriceps femoris muscle was assessed by a visual inspection of the intensity of the magnetic resonance imaging (MRI) signal. These measurements were carried out before and after the exercise. Ten healthy women (21.9 ± 1.5) took part in this study. The injury was induced by 4 series of 15 maximal eccentric isokinetic contractions at 5°/s. The MVC torque reduced up to the 4th day after the exercise (p < 0.05). The RMS of the vastus medialis oblique (VMO) and the rectus femoris (RF) muscles decreased on the 2nd (VMO and RF; p < 0.05) and 3rd (RF; p < 0.05) days after. The MDF of the VMO increased immediately after (p < 0.05), whilst the MDF of the RF and VL decreased immediately after (RF; p < 0.05), on the 1st (RF and VL; p < 0.05) and on the 2nd (VL; p < 0.05) days after. The CK activity increased on the 2nd day after (p < 0.05). An increase in the intensity of the MRI signal was observed on the 2nd and 7th days after. In conclusion: 1- the eccentric exercise with low angular speed was effective in inducing injury, 2- the quadriceps femoris already started its functional recovery, as shown by the MVC torque and electrical activity, in the first week after the exercise, despite the presence of an increase in the intensity of the MRI signal.
Key points
- The low angular speed eccentric exercise was effec-tive in inducing injury of the quadriceps femoris muscle, and could be used as a muscle injury induc-ing model in future studies;
- The quadriceps femoris muscle injured by eccentric exercise started its functional recovery in the first week after low angular speed eccentric exercise.
38.
Immediate skin-sparing mastectomy reconstruction with deep inferior epigastric perforator (DIEP) flap. Technical aspects and outcome 总被引:2,自引:0,他引:2
Munhoz AM Arruda E Montag E Aldrighi C Aldrighi JM Gemperli R Ferreira MC 《The breast journal》2007,13(5):470-478
Although breast reconstruction with deep inferior epigastric perforator (DIEP) flap is a well-described technique, few publications have specifically reported the technical aspects and the outcome following skin-sparing mastectomy (SSM). The aim of this study is to analyse the feasibility of its immediate application and to describe the operative planning, outcome and complications after SSM. 27 patients underwent 30 DIEP flap breast reconstructions with all immediate and 3 bilateral. Mean time of follow-up was 29 months. Breast skin, DIEP Flap and donor-site complications were evaluated. Information on patient satisfaction was collected. 70% had tumors measuring 2 cm or less (T1) and 74% were stage 0 and I according to American Joint Committee on Cancer. Breast skin complications occurred in 7.4%, all represented by small areas of skin necrosis. Partial losses were observed in two (7.4%) patients (less than 15% of total area) and total DIEP loss in 1 (3.7%). Donor-site complications represented by bulging occurred in only one patient (3.7%). The majority of patients were either very satisfied or satisfied. One local recurrence was observed. All complications except 2 were treated by a conservative approach. The DIEP flap is a reliable technique for SSM reconstruction. Success depends on patient selection, coordinated planning with the oncologic surgeon and careful intraoperative and postoperative management. The main advantage is that patients can safely undergo dual procedures with the added aesthetic benefits in breast and abdominal donor site. 相似文献
39.
Riesenman PJ Farber MA Rich PB Sheridan BC Mendes RR Marston WA Keagy BA 《Journal of vascular surgery》2007,46(5):934-940
BACKGROUND: Acute thoracic aortic injury resulting from blunt trauma is a life-threatening condition. Endovascular therapy is a less invasive treatment modality that may potentially improve patient outcomes. We reviewed our experience with patients who sustained blunt thoracic aortic injuries distal to the left subclavian artery and presented for open surgical or endovascular repair. METHODS: Between August 1993 and August 2006, 62 patients sustained blunt thoracic aortic injuries distal to the origin of the left subclavian artery and proceeded to undergo open surgical (n = 48, 77%), or endovascular repair (n = 14, 23%). Revised trauma score (RTS), injury severity score (ISS), new injury severity score (NISS), individual associated traumatic injuries, as well as operative and postoperative outcomes were compared between open surgical and endovascular groups. RESULTS: Age, gender, race, and mechanism of injury did not differ between open surgical and endovascular groups. Additionally, RTS, ISS, and NISS values were not significantly different. The proportion of patients with sternal fractures (14% vs 0%), or unstable spinal fractures (36% vs 10%) was significantly greater in the endovascular group. Of the patients who received endografts, 93% (n = 13) were evaluated by a cardiothoracic surgeon and assessed to be prohibitive to operative intervention. Endografts utilized included commercially manufactured thoracic endografts (n = 6; 43%) and abdominal aortic endograft components (n = 8; 57%). Forty-one interposition grafts were placed in the open surgical group. Renal complications (32% vs 7%), and urinary tract infections (35% vs 7%) approached significance between surgical and endovascular groups (P = .082 and P = .077, respectively). Intraoperative mortality for the surgical and endovascular groups was 23% and 0%, respectively (P = .056). Endovascular repair was associated with significant reductions in operative time (118 vs 209 minutes), estimated blood loss (77 vs 3180 ml), and intraoperative blood transfusions (0.9 vs 6.1 units). No endoleaks were detected during a mean follow-up of 9.4 months in the endovascular group. CONCLUSION: Endovascular repair of blunt descending thoracic aortic injuries utilizing thoracic or abdominal endographs is a technically feasible modality that is at least equivalent to open therapy in the short term and associated with a lower intraoperative mortality (P = .056). Endovascular therapy has advantages in operative time, operative blood loss, and intraoperative blood transfusions. 相似文献
40.
Riesenman PJ Farber MA Mendes RR Marston WA Fulton JJ Keagy BA 《Journal of vascular surgery》2007,45(1):90-4; discussion 94-5
BACKGROUND: Thoracic aortic stent grafts require proximal and distal landing zones of adequate length to effectively exclude thoracic aortic lesions. The origins of the left subclavian artery and other aortic arch branch vessels often impose limitations on the proximal landing zone, thereby disallowing endovascular repair of more proximal thoracic lesions. METHODS: Between October 2000 and November 2005, 112 patients received stent grafts to treat lesions involving the thoracic aorta. The proximal aspect of the stent graft partially or totally occluded the origin of at least one great vessel in 28 patients (25%). The proximal attachment site was in zone 0 in one patient (3.6%), zone 1 in three patients (10.7%), and zone 2 in 24 patients (85.7%). Patients with proximal implantation in zones 0 or 1 underwent debranching procedures of the supra-aortic vessels before stent graft repair. In one patient who underwent zone 1 deployment, the left subclavian artery was revascularized before stent graft deployment. Among patients who underwent zone 2 deployment with partial or complete occlusion of the left subclavian artery, none underwent prior revascularization. Patients were assessed postoperatively and at follow-up for development of neurologic symptoms as well as symptoms of left upper extremity claudication or ischemia. RESULTS: Mean follow-up was 7.3 months. Among the 24 patients with zone 2 implantation, 10 (42%) had partial left subclavian artery coverage at the time of their primary procedure. A total of 19 patients experienced complete cessation of antegrade flow through the origin of the left subclavian artery without revascularization at the time of the initial endograft repair as a result of a secondary procedure or as a consequence of left subclavian artery thrombosis. Left upper extremity symptoms developed in three (15.8%) patients that did not warrant intervention, and rest pain developed in one (5.3%), which was treated with the deployment of a left subclavian artery stent. Two primary (type IA and type III) endoleaks (7.1%) and one secondary endoleak (type IA) (3.6%) were observed in patients who underwent zone 2 deployment. Three cerebrovascular accidents were observed. Thoracic aortic lesions were successfully excluded in all patients who underwent supra-aortic debranching procedures. CONCLUSION: Intentional coverage of the origin of the left subclavian artery to obtain an adequate proximal landing zone during endovascular repair of thoracic aortic lesions is well tolerated and may be managed expectantly, with some exceptions. 相似文献