首页 | 本学科首页   官方微博 | 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   4427篇
  免费   167篇
  国内免费   18篇
耳鼻咽喉   49篇
儿科学   92篇
妇产科学   85篇
基础医学   682篇
口腔科学   88篇
临床医学   256篇
内科学   975篇
皮肤病学   47篇
神经病学   472篇
特种医学   149篇
外科学   699篇
综合类   24篇
预防医学   142篇
眼科学   68篇
药学   318篇
中国医学   11篇
肿瘤学   455篇
  2023年   19篇
  2022年   37篇
  2021年   73篇
  2020年   40篇
  2019年   55篇
  2018年   68篇
  2017年   75篇
  2016年   63篇
  2015年   63篇
  2014年   68篇
  2013年   126篇
  2012年   213篇
  2011年   230篇
  2010年   149篇
  2009年   141篇
  2008年   236篇
  2007年   270篇
  2006年   283篇
  2005年   285篇
  2004年   334篇
  2003年   330篇
  2002年   293篇
  2001年   59篇
  2000年   60篇
  1999年   64篇
  1998年   93篇
  1997年   80篇
  1996年   57篇
  1995年   56篇
  1994年   58篇
  1993年   71篇
  1992年   46篇
  1991年   46篇
  1990年   44篇
  1989年   47篇
  1988年   29篇
  1987年   25篇
  1986年   26篇
  1985年   28篇
  1984年   34篇
  1983年   26篇
  1982年   17篇
  1981年   23篇
  1980年   28篇
  1979年   17篇
  1978年   17篇
  1977年   24篇
  1976年   14篇
  1975年   10篇
  1969年   10篇
排序方式: 共有4612条查询结果,搜索用时 547 毫秒
991.

Background

Surgical results of GERD have mainly been reported from the Western countries, with a few reports found in Japan. We examined the surgical results of laparoscopic Toupet fundoplication and clarify the characteristics of recurrent cases.

Methods

The subjects included 375 patients who underwent laparoscopic Toupet fundoplication from June 1997 to December 2016 as the initial surgery. Patient characteristics, pathophysiology, and surgical results were examined. In addition, we compared the patient characteristics and pathophysiology of recurrent cases in comparison with non-recurrent cases.

Results

Age 59 (43–70) and male 211 (56.3%). The operation time was 141 min (113–180) and intraoperative complications were found to have onset in 13 subjects (3.5%). Dysphagia after surgery was found in 18 cases (4.8%). The A factor (the degree of hiatal hernia), P factor (the degree of esophagitis), and pH?<?4 holding time significantly improved after surgery compared with prior to surgery (p?<?0.001 for all), while the LES lengths and abdominal LES lengths were extended (p?<?0.001 for each). Recurrence was found in 48 patients (15.1%) among the 318 patients for whom we could confirm the presence or absence of recurrence. The A factor, P factor, and pH?<?4 holding time prior to surgery were, respectively, higher in the recurrence group (p?=?0.031, p?<?0.001, p?<?0.001).

Conclusions

Laparoscopic Toupet fundoplication for GERD could be performed safely, with a response rate as good as 85%. Compared with non-recurrent cases, preoperative clinical conditions such as esophageal hiatal hernia, reflux esophagitis, and acid reflux time were all advanced in recurrent cases.
  相似文献   
992.
The long-term outcome of Crohn's disease was reviewed in 74 patients who had a history of more than 10 years (range 10.8–27.3) since disease onset. The observation period was between 4.3 and 18.5 years, the mean and SD being 10.6±3.1 years. The means and SD of age at onset and final observation were 21±7 and 37±8 years, respectively. Fifty-eight of the 74 patients had not undergone bowel resection at the time of diagnosis; of these 58, 31 (53.4%) had an operation for the disease during the follow-up period. Thus, of the 74 patients, 47 (63.5%) (these 31, plus the 16 who had undergone bowel resection at the time of diagnosis) had an operation at least once during a follow-up period of 10 years or more. The cumulative operation rates 5, 10, and 15 years after onset in the 74 and 58 patients above were 18.9%, 6.9%, and 40.8%, and 34.8%, 49.1%, and 46.0%, respectively. The corresponding figures 5 and 10 years after diagnosis in all 74 patients and the 58 patients were 32.3% and 28.6% and 47.3% and 46.3%, respectively. There were no significant differences in the incidence of operation rate in relation to anatomical involvement. Cumulative reoperation rates 1, 3, 5, and 10 years after the first operation in the 31 patients who were operated on during the follow-up period were 3.4%, 6.9%, 25.5%, and 51.7%, respectively. Three patients died, the causes of death in one being directly related to Crohn's disease. The cumulative survival rate in all patients was compared with the expected survival rate in a sex- and age-matched general population. There was no significant difference between the two groups in survival rates in the-year period since onset. When the degree of satisfaction with quality of life in the previous 1 month and 1 year was evaluated by the patients themselves on an 11-point scale, in which a higher score indicated a better quality of life, about 30% of the patients had scores of 8–10. In the previous 1 year, 53% of the patients had been able to continue the same work, whereas 17% of the patients were not able to work. In conclusion, the prognosis for survival in Crohn's disease was very good; however, about 50% of patients required at least one surgical treatment during the 15-year followup period since onset, and about 70% of patients had some bowel or systemic symptoms, or emotional or social problems.  相似文献   
993.
994.
The case of a 16-year-old girl with primary mediastinal large B-cell lymphoma who had thrombosis in the brachiocephalic, subclavian, and internal jugular veins at presentation is reported. MACOP-B chemotherapy plus radiation therapy could be the first-line strategy, but MACOP-B increases the risk of thrombosis. Although an effective method for initial treatment of venous thromboembolism (VTE) in cancer patients has not been established, recent studies revealed that the administration of a low-molecular-weight heparin (LMWH) was effective for secondary prevention of VTE. Therefore, the patient in this case was treated with MACOP-B plus rituximab followed by radiation therapy, and an LMWH was administered through the course of treatment. She achieved complete remission and never suffered from VTE. This case suggests that long-term administration of an LMWH contributes to the primary improvement and secondary prevention of VTE even in patients who are at high risk for thrombosis.  相似文献   
995.
The aim of this study was to compare mortality and incidence of end-stage renal disease (ESRD) in patients with type 1 (insulin-dependent) diabetes who had attended a diabetes center with those who had not. The cohort consisted of a total of 1430 patients diagnosed with Type 1 diabetes at 18 years or younger, and between 1965 and 1979. This population-based cohort in Japan was subdivided into two groups: patients who had visited a large diabetes center in Tokyo (n=162) and those who had not (n=1212). Mortality and incidence of ESRD were compared between the two subgroups as of January 1, 1990. Crude mortality was 1.95 per 1000 person-years (95% CI: 0.49-5.06) for those who had visited the center and 6.05 (4.86-7.41) for those who had not. A multivariate Cox proportional hazard model showed that the patients who had visited the center were three times less likely to die (hazard ratio: 0.31, 95% CI: 0.10-0.98) than those who had not. Crude incidence of ESRD was 1.32 (0.22-4.09) and 5.86 (4.65-7.26) for those who had visited the center and for those who had not, respectively. After adjusting for covariates, the patients who had visited the center were five times less likely to develop ESRD (hazard ratio: 0.19, 0.05-0.78) than those who had not. Education and treatment of type 1 diabetes with an integrated management system under specialists and a multidisciplinary team appears to be associated with a better prognosis.  相似文献   
996.
A 64-year-old female, admitted because of severe dyspnea on exertion and facial edema, showed echocardiographic findings of a large tumor in the right ventricle (RV). Echocardiography revealed a cardiac mass extending from the RV across the tricuspid valve into the right atrium, synchronized with the cardiac cycle, and severe tricuspid regurgitation was apparent. The mass was removed under cardiopulmonary bypass. It measured 7 x 5 x 5 cm with diffuse superficial calcification and arose from the posterior wall of the RV, just under the tricuspid valve ring, with a short pedicle. During the same procedure, after the successful excision of the tumor, small atrial and ventricular septal defects were found that had been caused by the tumor and these were closed directly. The tricuspid valve was repaired with valvuloplasty, chordoplasty and annuloplasty. The microscopic findings were of typical myxoma; however, a right ventricular myxoma protruding into the right atrium is exceedingly rare.  相似文献   
997.
998.
999.
Radical surgery for fulminant amoebic colitis leads to extremely high mortality; however, resective surgery is mandatory if a patient develops massive fecal peritonitis. We herein report an extremely rare case of fulminant amoebic colitis with multiple perforations, which was successfully treated by staged surgical procedures. A 48-year-old man who had been treated with predonisolone under a diagnosis of ulcerative colitis was admitted. Biopsy specimens from the colonic mucosa revealed Entamoeba histolytica. On the day of diagnosis, he developed severe abdominal pain and underwent emergency laparoptomy, showing total colonic gangrene with multiple perforations associated with massive fecal peritonitis. Subtotal colectomy, mucous fistula of the rectosigmoid, and ileostomy were performed. He recovered well although disseminated intravascular coagulopathy developed postoperatively. As the middle and upper part of rectum was found to be severely stenotic 4 months after surgery, we performed proctectomy, ileal pouch anal canal anastomosis, and diverting ileostomy, which was reversed 6 months later. The patient has been well with satisfactory anal function 37 months after the initial surgery. This case suggests that (1) early and accurate diagnosis of amoebiasis is important to avoid surgical intervention, and (2) staged surgery including total colectomy should be considered as one of the treatment choices even in patients with total necrotizing amoebic colitis. Received: July 3, 2001 / Accepted: December 14, 2001 Acknowledgments. We gratefully thank Dr. Takeo Iwama, Director of the Department of Surgery, Kyoundo Hospital, Sasaki Research Institute, for useful advice. Reprint requests to: H. Ishida  相似文献   
1000.
Summary Myocardial availability of drug, using metoprolol as a tracer, in acutely ischemic myocardium in the area of the left circumflex (LCX) coronary artery was compared following standard intravenous (IV) administration and after coronary sinus retroinfusion. Seven open-chest farm pigs were subjected to a 21-minute occlusion of the LCX coronary artery. All animals received simultaneous IV tritium-labeled metoprolol (0.2 mg/kg) and unlabeled metoprolol (0.2 mg/kg) retrogradely into the coronary sinus. The drug administration was starded after 1 minute of coronary artery occlusion and continued for 5 minutes. Intravenously administered metoprolol resulted in a higher peak plasma concentration of metoprolol (382±52 nmol/l) than coronary sinus retroinfusion (276±47 nmol/l). The nonischemic myocardial metoprolol concentration was of similar magnitude (393–454 pmol/g), whether infused IV or into the coronary sinus. Coronary sinus retroinfusion, however, resulted in a substantial accumulation of metoprolol in the ischemic myocardium (2887–5863 pmol/g). Coronary sinus retroinfusion resulted in a pronounced and specific accumulation in the ischemic myocardium in the territory of the LCX coronary artery.  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