首页 | 官方网站   微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   83137篇
  免费   7179篇
  国内免费   4873篇
医药卫生   95189篇
  2024年   188篇
  2023年   1212篇
  2022年   2706篇
  2021年   3474篇
  2020年   2844篇
  2019年   2525篇
  2018年   2367篇
  2017年   2594篇
  2016年   2997篇
  2015年   3320篇
  2014年   5410篇
  2013年   5346篇
  2012年   4890篇
  2011年   5280篇
  2010年   4352篇
  2009年   4403篇
  2008年   4533篇
  2007年   4776篇
  2006年   4354篇
  2005年   3845篇
  2004年   3130篇
  2003年   2624篇
  2002年   2398篇
  2001年   2141篇
  2000年   1787篇
  1999年   1573篇
  1998年   1322篇
  1997年   1259篇
  1996年   1119篇
  1995年   962篇
  1994年   819篇
  1993年   643篇
  1992年   514篇
  1991年   454篇
  1990年   370篇
  1989年   341篇
  1988年   313篇
  1987年   266篇
  1986年   199篇
  1985年   264篇
  1984年   222篇
  1983年   137篇
  1982年   193篇
  1981年   155篇
  1980年   127篇
  1979年   135篇
  1978年   95篇
  1977年   67篇
  1976年   62篇
  1975年   25篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
Aim and methods  Nutrition, unhealthy lifestyles and cancer appear to be strictly related, but few authors have analysed the interest in dietary information of cancer patients and their families. This survey was conducted in the Veneto area (Italy) to investigate the concern of cancer patients and their family members about diet as a health tool before and after diagnosis of cancer. Results  Seven hundred and four questionnaires were collected: 380 from cancer patients and 324 from family members of cancer subjects. Breast cancer (BC) was the most frequent disease for patients (61.8%) as well as families (26.5%). Generally, the importance of having precise diet information after diagnosis is recognised by 40.3% of patients, with significant differences between the various types of cancer: gastric and colon/rectum cancer (GCC) patients were more concerned than BC women about precise information concerning a diet to follow immediately after diagnosis (p = 0.000, ODs = 3.10, CI 1.68–5.71) or during treatments (p = 0.001, ODs = 2.67, CI 1.46–4.89). The nutritional information is supplied to patients in 34% of cases and to relatives in 30.3%, often from non-medical sources. In total healthcare workers (family doctor, oncologist, surgeon, dietician) represented the exclusive source of dietary information for 24.9% of patients and 22.9% of family members. Diet after diagnosis changes in 69.1% of GCC patients and in 39.2% of BC women. Relatives, particularly women, report difficulties preparing patients’ meals in 30.7% of cases, changes in the eating habits of the entire family in 29.9% and discontent connected with patients diet in 13.9%. The concern about proper nutrition after diagnosis increases more in GCC subjects (p < 0.025) when compared to BC subjects and in patients with more recent diagnosis (p < 0.041) when compared with patients with diagnosis >5 years ago, while in family members the interest in diet after diagnosis increases more in women than in men (p < 0.030) without other differences regarding the degree of relationship, type of cancer or diagnosis time. Relatives (92.7%) have more interest in nutritional education than patients (74.9%). Cancer patients <65 years were more interested in educational initiatives concerning nutrition (p = 0.000, ODs = 4.46, CI 2.6–7.4) than older patients (>65 years) and female subjects were more concerned than male patients (p = 0.008, ODs = 2.11, CI 1.2–3.6). Conclusions  The interest in the dietary knowledge and in educational initiatives concerning nutrition is high in cancer patients and their relatives, although it decreases with the age. The poor attention paid to nutrition of cancer patients by various healthcare workers deserves consideration, since the psychophysical wellbeing and perhaps also survival of cancer patients can be improved by correct dietary management, as well as, naturally, by the principal treatments themselves.  相似文献   
22.
骨外型牙源性钙化上皮瘤1例报告   总被引:2,自引:0,他引:2  
牙源性钙化上皮瘤是一种良性肿瘤,也称Pindborg瘤,可分为骨内型和骨外型2种,主要发生于颌骨内,偶见于颌骨外。本文报告1例发生于口底的牙源性钙化上皮瘤,其临床症状与口底皮样囊肿相似.术后经组织病理学确诊,主要组织病理学特征是嗜酸性环状钙化团块。因其具有局部侵袭性,为避免复发,提倡完整切除肿物。  相似文献   
23.
Gastrogastric fistula: a possible complication of Roux-en-Y gastric bypass.   总被引:4,自引:0,他引:4  
BACKGROUND: Gastrogastric fistula is a communication between the proximal gastric pouch and the distal gastric remnant, rarely described in the realm of bariatric procedures. The aim of this study was to review the existing literature about this topic and to demonstrate its laparoscopic treatment. METHODS: An extensive literature review found several articles reporting this complication. However, no citation was found describing the steps of the laparoscopic management of this situation. RESULTS: Gastrogastric fistula occurs in up to 6% of Roux-en-Y gastric bypasses. Two theories exist for fistula formation: (1) it is a technical complication derived from the incomplete division of the stomach during the creation of the pouch, and (2) it occurs after a staple-line failure, developing a leak with an abscess, which then drains into the distal stomach forming the fistula. Early symptoms include fever, tachycardia, and abdominal pain. Failure in weight loss is a late clinical sign observed in these patients. Diagnosis is based on radiologic study, upper endoscopy and computed tomography. When identified in the acute postoperative course, laparoscopic treatment is easy. Chronic fistulas are difficult to manage, and the laparoscopic approach is an alternative to open surgery. CONCLUSIONS: Gastrogastric fistula is a possible complication of Roux-en-Y gastric bypass and its laparoscopic treatment is feasible.  相似文献   
24.
目的探讨中药健肝愈胃汤(自拟)、西药心得安、奥美拉唑、胶态果胶铋胶囊联合治疗门脉高性胃病(PHG)的疗法。方法将136例PHG患者随机分成两组,对照组52例常规口服心得安、奥美拉唑、果胶铋;治疗组84例在常规服用以上西药的同时服用中药健肝愈胃汤。两组疗程均为2个月。结果治疗组临床治疗总有效率89.3%。显效率46.4%;对照组临床治疗总有效率80.7%,显效率13.5%。两组比较有显著性差异(P〈0.05)。结论中药健肝愈胃汤、西药心得安、奥美拉唑、果胶铋联合治疗PHG疗效显著。  相似文献   
25.
26.
BACKGROUND: Gastric bypass is an established bariatric procedure that has undergone multiple modifications to improve its effectiveness. The side-to-side stapled technique is well recognized, but closure of the gastrotomy/enterotomy by the stapler can potentially narrow the Roux limb. Because of this, many surgeons will hand suture the closure of the gastrotomy/enterotomy. To obviate this difficulty, we inserted the linear stapler from the stomach's greater curvature, using a double-stapled anastomosis that minimized the need for hand suturing. METHODS: We performed a retrospective analysis of 307 patients undergoing this technique for laparoscopic gastric bypass. The weight loss and 30-day morbidity and mortality were tabulated and compared with those in other published series. RESULTS: Of the 307 patients, none died postoperatively. The overall 30-day morbidity rate was 15%. Two leaks from the gastrojejunostomy and 2 from the jejunojejunostomy (1.2%) developed. The mean percentage of excess weight loss was 34% at 3 months, 52% at 6 months, 73% at 1 year, 71% at 2 years, and 69% at 3 years. CONCLUSION: The greater curve approach avoids Roux limb obstruction, minimizes the need for hand suturing, and uses standard trocar incisions. Our short-term follow-up results are similar to those of series of other techniques.  相似文献   
27.
目的 评价子宫动脉栓塞术治疗子宫肌瘤的近期疗效。方法 89例子宫肌瘤患者,采用Seldinger技术分别作左右子宫动脉主干插管检查和栓塞治疗,栓塞剂采用聚乙稀醇颗粒(PVA)或白芨混合颗粒。结果 72例(80.9%)完成随访,随访时间1~28个月。有94.1%(64/68)的患者月经复常;治疗后瘤体缩小25.2%~76.8%(M=41.3%)。除了术中术后疼痛(65例)和发热(16例)外,有2例因肌瘤坏死行子宫切除术,1例出现卵巢早衰。结论 子宫动脉栓塞术治疗子宫肌瘤的近期疗效满意,远期疗效尚待进一步观察。  相似文献   
28.
目的:分析胃癌大肠转移的X线钡灌肠表现。方法:104例胃癌入院术前检查发现结肠转移或胃癌术后转移入院治疗的病例。分析钡灌肠初次发现大肠转移征象的年龄、发现胃癌原发病变距初次发现大肠转移的间隔时间、转移病变的发生部位和病变造成的X线钡灌肠图像上的肠管变形和粘膜面的改变。结果:104例胃癌结肠转移,男67例,女37例。胃癌术前检查中发现结肠转移者32例,术后发现的大肠转移中,多数转移发生在手术后3年内(占91.3%)。胃癌原发灶的肉眼形态BorrmannⅢ型(28例)和BorrmannⅣ型(65例)者占89.4%,组织学中以低分化腺癌和印戒细胞癌为主要成分者占91.3%。X线钡灌肠检查显示大肠转移的好发部位为横结肠(80),其次为直肠(50)。转移灶可累及多节段肠管,其中横结肠中1/3段(47),横结肠左1/3(44),横结肠右1/3(39)和直肠腹膜返折之上(39)。X线显示肠管单侧变形者227处,双侧变形者96处。黏膜面表现为梳齿状黏膜纹聚集改变253处,颗粒结节状改变23处,外压性改变20处,弥漫性改变62处。结论:胃癌大肠转移的好发部位为横结肠和直肠,结肠黏膜面的梳齿状黏膜纹聚集为胃癌大肠转移的主要X线钡剂灌肠表现。  相似文献   
29.
Little is known about the effects of immunosuppression on patients with hereditary nonpolyposis colorectal cancer (HNPCC). We describe a kidney transplant recipient with unrecognized Muir-Torre syndrome in whom the administration of a tacrolimus-based regimen led to the eruption of multiple sebaceous tumors. The patient was later found to harbor an MSH2 mutation. Switching to a sirolimus-based regimen resulted in arrest of the disease. When the patient was switched back to tacrolimus, new facial lesions rapidly appeared. Switching again to sirolimus resulted again in halting the appearance of new lesions. This finding is in line with the known antiangiogenic activity of sirolimus and reports on the regression of cutaneous Kaposi's sarcoma in kidney transplant recipients switched from another immunosuppressive regimen to sirolimus. Further studies on the potential use of sirolimus for the treatment of de novo tumors in immunosuppressed kidney transplant recipients with HNPCC are warranted.  相似文献   
30.
经尿道电气化手术治疗112例膀胱肿瘤的临床分析   总被引:1,自引:0,他引:1  
目的 :探讨经尿道电气化手术治疗病变局限于膀胱壁内肿瘤的治疗方法。方法:综合采用套切、勾切、气化、凝切及电凝、封闭闭孔神经等技术 ,经尿道根治性电气化手术切除膀胱肿瘤 112例。结果:2例因膀胱穿孔改行开放手术 ,7例需 2次手术完全切除肿瘤 ,全部病例均达到根治性切除目的 ,术后平均留置尿管 3~ 7d。结论 :经尿道电气化切除手术适宜病变局限于膀胱壁内肿瘤的根治性治疗。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号