全文获取类型
收费全文 | 15012篇 |
免费 | 718篇 |
国内免费 | 103篇 |
专业分类
耳鼻咽喉 | 194篇 |
儿科学 | 209篇 |
妇产科学 | 106篇 |
基础医学 | 1883篇 |
口腔科学 | 265篇 |
临床医学 | 805篇 |
内科学 | 4068篇 |
皮肤病学 | 239篇 |
神经病学 | 921篇 |
特种医学 | 635篇 |
外科学 | 2820篇 |
综合类 | 50篇 |
一般理论 | 1篇 |
预防医学 | 361篇 |
眼科学 | 257篇 |
药学 | 1017篇 |
中国医学 | 27篇 |
肿瘤学 | 1975篇 |
出版年
2023年 | 93篇 |
2022年 | 186篇 |
2021年 | 352篇 |
2020年 | 180篇 |
2019年 | 244篇 |
2018年 | 313篇 |
2017年 | 272篇 |
2016年 | 312篇 |
2015年 | 338篇 |
2014年 | 410篇 |
2013年 | 511篇 |
2012年 | 839篇 |
2011年 | 873篇 |
2010年 | 478篇 |
2009年 | 483篇 |
2008年 | 827篇 |
2007年 | 900篇 |
2006年 | 890篇 |
2005年 | 866篇 |
2004年 | 826篇 |
2003年 | 809篇 |
2002年 | 832篇 |
2001年 | 319篇 |
2000年 | 286篇 |
1999年 | 287篇 |
1998年 | 202篇 |
1997年 | 168篇 |
1996年 | 126篇 |
1995年 | 134篇 |
1994年 | 115篇 |
1993年 | 89篇 |
1992年 | 221篇 |
1991年 | 221篇 |
1990年 | 187篇 |
1989年 | 179篇 |
1988年 | 174篇 |
1987年 | 185篇 |
1986年 | 143篇 |
1985年 | 137篇 |
1984年 | 89篇 |
1983年 | 69篇 |
1982年 | 49篇 |
1979年 | 68篇 |
1978年 | 40篇 |
1975年 | 35篇 |
1974年 | 35篇 |
1973年 | 40篇 |
1971年 | 44篇 |
1968年 | 42篇 |
1967年 | 35篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Procedures of Choice for Resection of Primary and Recurrent Liver Metastases from Colorectal Cancer 总被引:5,自引:0,他引:5
Tanaka K Shimada H Ohta M Togo S Saitou S Yamaguchi S Endo I Sekido H 《World journal of surgery》2004,28(5):482-487
Although liver resection offers the only realistic chance of cure for patients with liver metastases from colorectal cancer, no consensus exists as to the procedure of choice for managing these tumors. Data from 193 patients who underwent hepatectomy for liver metastases from colorectal cancer and 26 of 193 patients who underwent repeat hepatectomy for recurrent metastases were collected. The suitability of resection was evaluated retrospectively based on known risk factors for recurrence and patterns of recurrence. On multivariate analysis, a positive surgical margin (SM+) was the only risk factor for recurrence after the initial resection (p < 0.01). SM+ (p < 0.01) and nonanatomic resection (p < 0·05) that was less than a sectionectomy (p < 0.05) were risk factors for recurrence after repeat hepatectomy. Multiple tumors (four or more) was the most common pattern of recurrence after initial hepatectomy, and recurrence close to the line of resection was most common after repeat hepatectomy. Based on tumor doubling times, recurrence after initial hepatectomy seemed to originate from the primary colorectal lesion, whereas recurrence after repeat hepatectomy was derived from a hepatic metastasis. Retrospective analysis suggests that hepatectomy with clear surgical margins is more important than anatomic resection for initial hepatectomy, and at least sectionectomy is necessary for repeat hepatectomy. 相似文献
992.
Persistent primitive lateral vertebrobasilar (PPLVB) anastomosis is a rare remnant of early fetal development whose occurrence, to our knowledge, has been reported only once. We now report a new variant in which the basilar artery was fed primarily by a PPLVB anastomosis because on one side the vertebrobasilar junction was incompletely developed and on the other it was aplastic. Aneurysmal rupture in this case may be attributable to excessive hemodynamic stress. 相似文献
993.
The value of MR imaging by post-contrast T1-weighted 3D spoiled gradient-echo (3D SPGR) is well established for the detection of small vestibular schwannomas in the cerebellopontine angle region. We describe a case in which a flow ghost artifact in the slice-encoding direction mimicked a vestibular schwannoma and heavily T2-weighted MR cisternography and multiplanar reconstruction images helped us to reach the correct diagnosis. In addition, we conducted a volunteer study to demonstrate that changing the k-space trajectory can reduce this artifact in post-contrast 3D SPGR images. 相似文献
994.
Outcome after simultaneous colorectal and hepatic resection for colorectal cancer with synchronous metastases 总被引:24,自引:0,他引:24
BACKGROUND: Consensus has not been reached concerning the timing of hepatectomy in patients with synchronous colorectal liver metastases, specifically with respect to patient selection criteria for simultaneous resection of the colorectal primary and the liver metastasis. METHODS: Retrospectively obtained clinicopathologic data for 39 consecutive patients with synchronous colorectal cancer metastases to the liver, who underwent curative simultaneous "1-stage" hepatectomy and resection of the colorectal primary at 1 institution, were subjected to univariate and multivariate analysis concerning the safety and success of the combined procedure. RESULTS: Only the volume of the resected liver was selected as a risk factor for postoperative complications (350 g mean resected liver volume in patients with postoperative complications vs 150 g in those without complications; P <.05). Patient age of 70 years or older (P <.05) and poorly differentiated or mucinous adenocarcinoma as the primary lesion (P <.01) predicted decreased overall survival by univariate analysis. Multivariate analysis retained histologic differentiation of the colorectal primary as an independent survival predictor (P <.05). CONCLUSIONS: A 1-stage procedure appears desirable for synchronous colorectal hepatic metastases except for patients requiring resection of more than 1 hepatic section, patients aged 70 years or older, and those with poorly differentiated or mucinous adenocarcinomas as primary lesions. 相似文献
995.
Masuda M Nakayama K Hiromoto Y Hirokawa M Satomi Y Shiramizu M Furuhata A Ikeda A Kawasaki C 《Hinyokika kiyo. Acta urologica Japonica》2004,50(5):309-314
The etiology of nocturia in 70 patients with benign prostatic hyperplasia (BPH) who had nocturia of two or more times were examined based on frequency volume charts (FVC). Nocturia was classified into four groups: nocturnal polyuria, low capacity, combined nocturia, and no evidence of abnormality. Nearly half of the cases had nocturnal polyuria only. A little under 70% of patients had associated nocturnal polyuria (nocturnal polyuria+combined nocturia). Naftopidil was administered for three months to the patients with BPH who had nocturia with a urinary frequency of two or more times. Clinical efficacy was evaluated in 32 patients based on FVC and naftopidil was shown to improve nocturia. The improvement in nocturia was determined by the increment in voided volume. 相似文献
996.
At medical meetings, a video-recorded surgical procedure can be more persuasive than an oral or poster presentation. Because operating rooms generally have limited space, video setups must be efficient and effective. Patients undergoing hepatectomy and rectal resection were recorded using two sectional crane-type tripods and video cameras placed in different positions. Both small crane-type tripods and video cameras could record surgical procedures from different angles and were easily controlled. Surgical procedures by the surgeon and first assistant were recorded independently. Videotaping surgical procedures with two video cameras can make presentations at medical meetings more effective. 相似文献
997.
Nawa Y Masuda Y Imaizumi H Yoshida H Kihara C Okada Y Asai Y 《Masui. The Japanese journal of anesthesiology》2004,53(5):547-550
It has been reported that pulmonary thromboembolism (PTE) is a major complication in the post-operative period. However, there have been few reports on PTE after cardiopulmonary bypass (CPB). We report a case of PTE that occurred after cardiac surgery using CPB. A 76-year-old female patient underwent aorto-coronary graft bypass and mitral valve plasty because of ischemic heart disease and mitral valve regurgitation, respectively. The results of blood gas analysis after cardiopulmonary bypass showed no abnormalities. Immediately after ICU admission, the oxygenation index (PaO2/FIO2) of the patient was below 100, and the low level persisted despite decrease in interstitial fluid volume of the lung. Evaluations of hemodynamics using ultrasound echography and a Swan-Ganz catheter showed no findings associated with right heart failure. The results of lung perfusion scintigraphy performed on the 6th postoperative day (POD), revealed the decline in radioactivities in the upper and middle lobe areas of the right lung. Urokinase was therefore administered intravenously from the 6th to 9th POD. The oxygenation index increased dramatically after urokinase administration. Although the use of thrombolytic therapy in an early postoperative period is controversial, our patient was successfully treated with urokinase without a life-threatening bleeding tendency. 相似文献
998.
Furukawa H Takahashi S Mizutani T Nakayama S Wada T Toyooka H 《Masui. The Japanese journal of anesthesiology》2004,53(3):294-297
A 59-year-old man presented with severe dyspnea caused by advanced laryngeal cancer. As he had disregarded the dyspnea for a month, we did not have enough information about the extent of the tumor. The pulse oximeter showed 88% with oxygen inhalation. Because of severe dyspnea, he could not maintain supine position. Fiberoptic laryngoscopy showed tumor bulk obstructing airway directly. In the operating room, at first, a cricothyroid membrane puncture was attempted under local anesthesia but the procedure was abandoned when the patient became hypoxic and unconscious. Immediately tracheostomy and cardiopulmonary resuscitation were performed. Tumor bulk had displaced the trachea and surrounding structures, making a tracheostomy difficult. Nine min after loss of consciousness, a secure airway was obtained. However, he was still unconscious and developed characteristic decerebrate rigidity. Therefore the patient was treated with infusion of thiamylal and free radical scavenger and mild hypothermia therapy (bladder temperature 34 degrees C). On the fifth day of this treatment, after rewarming and discontinuation of thiamylal, the patient responded to command. He recovered with no neurological deficits. This case suggests that combined treatment with barbiturate, free radical scavenger, and mild hypothermia therapy is effective to minimize ischemic brain damage after cardiopulmonary resuscitation. 相似文献
999.
1000.
Kubota M Yagi M Kanada S Yamazaki S Tanaka S Asami K Ogawa A Watanabe A Iwabuchi H Kaneko M Saida Y 《Journal of pediatric surgery》2004,39(12):1775-1778