全文获取类型
收费全文 | 64867篇 |
免费 | 4549篇 |
国内免费 | 1913篇 |
专业分类
耳鼻咽喉 | 341篇 |
儿科学 | 1518篇 |
妇产科学 | 240篇 |
基础医学 | 3223篇 |
口腔科学 | 374篇 |
临床医学 | 8665篇 |
内科学 | 17747篇 |
皮肤病学 | 95篇 |
神经病学 | 1635篇 |
特种医学 | 8796篇 |
外国民族医学 | 7篇 |
外科学 | 4870篇 |
综合类 | 11650篇 |
现状与发展 | 3篇 |
预防医学 | 2623篇 |
眼科学 | 1452篇 |
药学 | 4591篇 |
54篇 | |
中国医学 | 1942篇 |
肿瘤学 | 1503篇 |
出版年
2024年 | 206篇 |
2023年 | 1123篇 |
2022年 | 2231篇 |
2021年 | 2953篇 |
2020年 | 2703篇 |
2019年 | 2296篇 |
2018年 | 2297篇 |
2017年 | 2311篇 |
2016年 | 2353篇 |
2015年 | 2362篇 |
2014年 | 4565篇 |
2013年 | 4461篇 |
2012年 | 3859篇 |
2011年 | 4006篇 |
2010年 | 3321篇 |
2009年 | 3231篇 |
2008年 | 3125篇 |
2007年 | 3118篇 |
2006年 | 2761篇 |
2005年 | 2381篇 |
2004年 | 1959篇 |
2003年 | 1646篇 |
2002年 | 1338篇 |
2001年 | 1231篇 |
2000年 | 998篇 |
1999年 | 891篇 |
1998年 | 799篇 |
1997年 | 776篇 |
1996年 | 710篇 |
1995年 | 658篇 |
1994年 | 565篇 |
1993年 | 449篇 |
1992年 | 415篇 |
1991年 | 339篇 |
1990年 | 344篇 |
1989年 | 286篇 |
1988年 | 255篇 |
1987年 | 244篇 |
1986年 | 217篇 |
1985年 | 298篇 |
1984年 | 246篇 |
1983年 | 136篇 |
1982年 | 184篇 |
1981年 | 153篇 |
1980年 | 144篇 |
1979年 | 107篇 |
1978年 | 91篇 |
1977年 | 79篇 |
1976年 | 47篇 |
1975年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Goichi Yotsumoto Koki Tanaka Naoki Ishizaki Akira Ikoma Sumihiro Kawashima Akira Taira 《Surgery today》1997,27(7):657-660
We report herein a case of spontaneous subcapsular hepatic hemorrhage which occurred in a 33-year-old woman 1 day after she
had been delivered of her second child by cesarean section following an uneventful pregnancy. She complained of right upper
quadrant pain on the 1st postoperative day, and computed tomography (CT) showed subcapsular low-density masses in both liver
lobes, while extravasation was demonstrated by CO2 intraarterial digital subtraction angiography (IADSA). The hemorrhage was successfully controlled by transcatheter arterial
embolization (TAE). However, on the 3rd day after TAE, an exploratory laparotomy was performed to establish an exact diagnosis
to explain the persistent abdominal pain and abnormal liver function tests. Subcapsular hematomas in both lobes were confirmed
and no visible laceration was present. The patient recovered gradually by spontaneous absorption of the hematomas and was
discharged on the 22nd postoperative day. Spontaneous hepatic hemorrhage associated with pregnancy is a very rare complication,
and establishing a correct diagnosis and initiating appropriate therapy are essential for this life-threatening disease. 相似文献
22.
Summary Obturator hernias comprise a rare group of abdominal hernias. They are often diagnosed when the small bowel has become obstructed
and the patients are operated on without the causes of the obstruction being known. Although many techniques for closure of
the defect are available, there is no agreement at the present time as to which is the procedure of choice. 相似文献
23.
Daniel W. Walsh Vincent B. Ho Michael F. Haggerty 《Journal of magnetic resonance imaging : JMRI》1997,7(2):312-315
Mycotic aneurysms of the abdominal aorta are potentially fatal but uncommon. We report the MRI and MRA features of an abdominal aortic mycotic aneurysm in a patient who presented with nonspecific low back pain. By delineating the saccular nature of the aneurysm and identifying the coexistence of vertebral enhancement, MRI was crucial for the final diagnosis. A potential pitfall of contrast-enhanced MRA is also demonstrated. 相似文献
24.
Kazue Shimmoto Shinichiro Ushigome Takashi Nikaido YaSUShi Kikuchi Naoaki Kobayashi Yohji Yamazaki 《Pediatric hematology and oncology》1991,8(2):147-157
A case is reported of Wilms' tumor associated with multiple pulmonary metastases histologically showing maturation of the tumor cells at 9 years after the resection of the primary tumor and intensive therapy. A huge tumor of a 22-month-old patient's right kidney was resected. The tumor was diagnosed as Wilms' tumor of mesenchymal type (stage 1), which consisted of predominantly immature mesenchymal tissue including rhabdomyoblasts, smooth muscle and fibrous tissue, and few blastemal and epithelial components. Intensive preoperative and postoperative chemotherapy with actinomycin D and vincristine and postoperative irradiation therapy totaling 16 Gy were carried out. The patient was regularly followed up uneventfully until 9 years after the surgery. On routine chest x ray at the age of 10 years 11 months, multiple pulmonary nodules were found. The excised nodules from the bilateral lungs disclosed similar histology, exclusively composed of dense collagen bundles and fibrocytes intermingled with mature striated muscle bundles. No immature tumor components were detected. The possible effect of intensive therapy in this maturation was stressed, although spontaneous benign differentiation of tumor cells cannot be excluded. 相似文献
25.
Richard Sacknoff M.D. Robert A. Novelline M.D. James T. Rhea M.D. J. Nash Lawrason M.D. Patrick M. Rao M.D. 《Emergency radiology》1997,4(2):109-111
A 36-year-old man was brought to the emergency department after being assaulted. A mandible series showed a nondisplaced fracture through the angle of the mandible extending through the left third molar tooth. Axial slices from a nonhelical computed tomographic (CT) examination of the head as well as a helical CT examination of the mandible failed to demonstrate the fracture. The fracture was well shown, however, on sagittal CT reformations. Although CT is generally regarded as more sensitive than plain radiography for the detection of fractures, fractures may be overlooked by CT if examination in only one plane is performed. 相似文献
26.
Unique variant of partial anomalous pulmonary venous connection with intact atrial septum 总被引:1,自引:0,他引:1
Summary Partial anomalous pulmonary venous connections (PAPVCs) are rare in association with an intact atrial septum. However, the diagnosis should be considered in patients with otherwise unexplained findings of left-to-right shunt and right heart enlargement. An unusual variant is presented, which we considered unsuitable for operative repair, based on findings at catheterization. Developmental, hemodynamic, and surgical considerations are discussed. 相似文献
27.
Richard Simpson Catherine Kennedy Hugh Carmalt Brian McCaughan David Gillett 《ANZ journal of surgery》1997,67(10):717-719
Background : A patient with a solitary pulmonary metastasis who had breast cancer in the past may benefit from pulmonary resection. Methods : Between 1984 and 1996, 17 patients underwent metastatectomy for metastatic breast cancer. There were 15 females and two males whose average age was 59 (range: 40–74 years). The median tumour-free interval after the primary breast-cancer operation was 5.1 years (range: 8 months-18.2 years). Sixteen patients had complete resections, which included six lobectomies and 10 lesser resections. Results : The postoperative mortality was nil and the morbidity rate was 6%. Follow-up was complete in all patients. Recurrent disease developed in four patients and two patients died of their disease. The 5-year survival was 62%. Conclusion : An aggressive surgical approach is warranted in patients with isolated resectable pulmonary metastases from breast cancer. 相似文献
28.
Open surgery of giant paraclinoid aneurysms improved by intraoperative angiography and endovascular retrograde suction decompression 总被引:1,自引:0,他引:1
Summary In three consecutive cases of giant left sided paraclinoid aneurysms we employed an endovascular retrograde suction decompression technique in combination with intra-operative angiography. A double-lumen balloon catheter was placed in the left internal carotid artery by the transfemoral route. After balloon inflation and placement of a temporary clip distal to the aneurysm blood was aspirated and the aneurysm collapsed. Thus further dissection of the aneurysm could easily be achieved and clips could be placed. Afterwards real-time digital subtraction angiography was performed. Intra-operative angiography led to clip repositioning in all cases either due to a clip induced stenosis of the parent vessel, or because of incomplete aneurysm obliteration. Afterwards successful clipping could be confirmed in all cases. Outcome was excellent in one case, good in the other. The third case, extremely complicated by an accompanying craniopharyngioma, showed a satisfactory outcome, but presented new neurological deficits. 相似文献
29.
Patrick M. Rao M.D. James T. Rhea M.D. Robert A. Novelline M.D. 《Emergency radiology》1997,4(5):268-275
This article reviews a focused helical appendiceal computed tomographic technique and discusses an approach to appendiceal computed tomographic interpretation. 相似文献
30.
Postoperative pulmonary complication rate and long-term changes in respiratory function following esophagectomy with esophagogastrostomy 总被引:9,自引:0,他引:9
Upper abdominal surgery has a high incidence of postoperative respiratory complications. Although operations involving a thoracic as well as an upper abdominal incision as encountered in esophageal surgery are likely to be associated with an even higher complication rate and perhaps permanent alterations of respiratory function, only a few studies have addressed this problem. We evaluated the postoperative course of patients undergoing thoracoabdominal esophagectomy with esophagogastrostomy. Twenty patients were evaluated, of whom 10 (50%) developed respiratory complications as defined by our criteria, which were the simultaneous occurrence of rectal temperature over 38 degrees C on the first postoperative day and radiographic evidence of pulmonary infiltration. Although there is no general consensus regarding the diagnostic criteria of a postoperative pulmonary complication, we were able to validate the clinical relevance of our definition by showing that these patients suffered from a more severe and more prolonged impairment of global oxygen exchange than those who did not fulfill the criteria. They also required a longer period of respiratory support (median duration of intubation 12 vs. 3 days, P less than 0.005). A comparison of the preoperative pulmonary function with that determined at least 6 months after the operation showed that only vital capacity (VC) and total lung capacity (TLC) were significantly (P less than 0.05) reduced following the operation, but not to a clinically relevant degree (VC-6%, TLC-7%). 相似文献