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   1179篇
  免费   53篇
  国内免费   3篇
耳鼻咽喉   8篇
儿科学   55篇
妇产科学   15篇
基础医学   143篇
口腔科学   20篇
临床医学   108篇
内科学   276篇
皮肤病学   27篇
神经病学   91篇
特种医学   62篇
外科学   200篇
综合类   10篇
预防医学   78篇
眼科学   10篇
药学   84篇
中国医学   1篇
肿瘤学   47篇
  2023年   8篇
  2022年   16篇
  2021年   25篇
  2020年   15篇
  2019年   25篇
  2018年   36篇
  2017年   24篇
  2016年   32篇
  2015年   23篇
  2014年   29篇
  2013年   32篇
  2012年   80篇
  2011年   65篇
  2010年   43篇
  2009年   39篇
  2008年   36篇
  2007年   43篇
  2006年   42篇
  2005年   29篇
  2004年   32篇
  2003年   41篇
  2002年   53篇
  2001年   33篇
  2000年   45篇
  1999年   39篇
  1998年   23篇
  1997年   21篇
  1996年   18篇
  1995年   19篇
  1994年   16篇
  1993年   19篇
  1992年   21篇
  1991年   21篇
  1990年   18篇
  1989年   26篇
  1988年   22篇
  1987年   17篇
  1986年   12篇
  1985年   19篇
  1984年   4篇
  1983年   3篇
  1982年   10篇
  1981年   7篇
  1980年   9篇
  1979年   5篇
  1978年   7篇
  1977年   6篇
  1976年   7篇
  1975年   7篇
  1974年   3篇
排序方式: 共有1235条查询结果,搜索用时 13 毫秒
11.
Hepatic hydatidosis is an endemic disease that affects vast segments of the populations of various countries in the Mediterranean region, South America, the Pacific, and temperate zone nations that possess large numbers of sheep. Four hundred and ten patients bearing 561 hydatid cysts were treated at 2 major hospitals in Madrid, Spain in the period 1974–1989. In order to establish the modifications in diagnostic and therapeutic management introduced as a result of modernization of our clinical facilities and improved technological standards, they were divided into 2 groups: group A corresponded to the period 1974–1984, and group B, corresponded to the period 1985–1989. Since no effective parasiticide agent is available, hepatic hydatidosis must be treated surgically. Today's better knowledge and advancements in liver surgery have made it possible to extirpate the cyst completely with little risk and improved results; hepatic resection should only be considered in exceptional cases; aspiration, drainage procedures, or partial resections of the cyst yield inferior results. We have had no relapse of the hydatid disease in the liver or in any other abdominal site.
Resumen La hidatidosis hepática es una enfermedad endémica que afecta a vastos segmentas de las poblaciones de diversos países de la región mediterránea, Sur América, el Pacífico, y las naciones de las zonas templadas que mantienen grandes rebanos de ovejas. Cuatrocientos diez pacientes con 561 quistes hidatídicos fueron tratados en 2 grandes hospitales de Madrid, España en el período 1974–1989. Con el propósito de establecer las modificaciones en el manejo diagnóstico y terapéutico ocurridas como resultado de la modernización de nuestras facilidades clínicas y de superiores estándares tecnológicos, dividimos la población total de estos pacientes en 2 grandes grupos: grupo A, correspondiente al período 1974–1984, y grupo B, correspondiente al período 1985–1989. Puesto que no existe un agente parasitocida efectivo, la hidatidosis hepática debe ser tratada quirúrgicamente. El mejor conocimiento actual y el avance en la cirugía hepática han hecho posible la extirpatión completa del quiste con bajo riesgo y mejores resultados; la resection hepática debe ser considerada sólo en casos excepcionales; la aspiración, los procedimientos de drenaje o las resecciones parciales del quiste se asocian con malos resultados. En nuestra experiencia no hemos tenido recurrencia de la enfermedad ni en el hígado ni en otros órganos.

Résumé Le kyste hydatique du foie est une maladie endémique qui touche une partie importante de la population dans différents pays de la région méditerranéenne, en Amérique du Sud, dans le Pacifique, et dans les pays de la zone tempérée qui ont beaucoup de moutons. Quatre cent dix patients porteurs de 561 kystes hydatiques ont été traités dans les deux plus grands hôpitaux de Madrid en Espagne de 1974 à 1989. Pour mesurer les progrès dans le diagnostic et le traitement dus à la modernisation de notre équipement médical et à une meilleure technologie, les patients ont été divisés en 2 groupes chronologiques: groupe A de 1974 à 1984 et groupe B de 1985 à 1989. Comme il n'y a pas actuellement de médicament efficace contre ce parasite, on doit traiter par la chirurgie le kyste hydatique. Aujourd'hui, les connaissances plus étendues et les progrès dans la chirurgie du foie permettent d'enlever complètement le kyste avec peu de risques et avec de meilleurs résultats; la résection du foie ne doit être envisagée que dans de rares cas. Les procédés d'aspiration ou de drainage ou les résections partielles du kyste donne des résultats moins bons. Nous n'avons pas eu de récidive du kyste hydatique, ni au foie ni dans une autre localisation péritonéale.
  相似文献   
12.
Zinc, a new coherent therapy for osteoporosis?   总被引:3,自引:0,他引:3  
  相似文献   
13.
PURPOSE: To compare the effectiveness and side effects of methadone and morphine as first-line treatment with opioids for cancer pain. PATIENTS AND METHODS: Patients in international palliative care clinics with pain requiring initiation of strong opioids were randomly assigned to receive methadone (7.5 mg orally every 12 hours and 5 mg every 4 hours as needed) or morphine (15 mg sustained release every 12 hours and 5 mg every 4 hours as needed). The study duration was 4 weeks. RESULTS: A total of 103 patients were randomly assigned to treatment (49 in the methadone group and 54 in the morphine group). The groups had similar baseline scores for pain, sedation, nausea, confusion, and constipation. Patients receiving methadone had more opioid-related drop-outs (11 of 49; 22%) than those receiving morphine (three of 54; 6%; P =.019). The opioid escalation index at days 14 and 28 was similar between the two groups. More than three fourths of patients in each group reported a 20% or more reduction in pain intensity by day 8. The proportion of patients with a 20% or more improvement in pain at 4 weeks in the methadone group was 0.49 (95% CI, 0.34 to 0.64) and was similar in the morphine group (0.56; 95% CI, 0.41 to 0.70). The rates of patient-reported global benefit were nearly identical to the pain response rates and did not differ between the treatment groups. CONCLUSION: Methadone did not produce superior analgesic efficiency or overall tolerability at 4 weeks compared with morphine as a first-line strong opioid for the treatment of cancer pain.  相似文献   
14.
OBJECTIVE: The ketogenic diet is a high-fat, low-protein, low-carbohydrate diet developed in the 1920s for the treatment of children with difficult to control seizures. Despite advances in both the pharmacotherapy and the surgery of epilepsy, many children continue to have difficult-to-control seizures. This prospective study sought to determine the ketogenic diet's effectiveness and tolerability in children refractory to today's medications. METHODS: One hundred fifty consecutive children, ages 1 to 16 years, virtually all of whom continued to have more than two seizures per week despite adequate therapy with at least two anticonvulsant medications, were prospectively enrolled in this study, treated with the ketogenic diet, and followed for a minimum of 1 year. Seizure frequency was tabulated from patients' daily seizure calendars and seizure reduction calculated as percentage of baseline frequency. Adverse events and reasons for diet discontinuation were recorded. RESULTS: The children (mean age, 5.3 years), averaged 410 seizures per month before the diet, despite an exposure to a mean of 6.2 antiepileptic medications. Three months after diet initiation, 83% of those starting remained on the diet and 34% had >90% decrease in seizures. At 6 months, 71% still remained on the diet and 32% had a >90% decrease in seizures. At 1 year, 55% remained on the diet and 27% had a >90% decrease in seizure frequency. Most of those discontinuing the diet did so because it was either insufficiently effective or too restrictive. Seven percent stopped because of intercurrent illness. CONCLUSIONS: The ketogenic diet should be considered as alternative therapy for children with difficult-to-control seizures. It is more effective than many of the new anticonvulsant medications and is well tolerated by children and families when it is effective.  相似文献   
15.
16.
BACKGROUND AND OBJECTIVES: This prospective, randomized, double-blind study compares the efficacy of two spinal needles in terms of their performance characteristics and associated perioperative complaints in young patients. METHODS: ASA I and II patients aged from 20 to 40 years undergoing lower limb orthopedic surgery were included during a 12-month period. After application of the protocol, 158 patients were recruited. The patients were randomized to two groups: group I: 26-gauge Atraucan (n = 79) and Group II: 27-gauge Whitacre (n = 79). A study was made of the demographic parameters, technical characteristics, and peri- and postoperative complications. RESULTS: No significant differences were found in the technical handling of the needles, number of attempts made to achieve the puncture, or the time required to perform the technique. No technical failures (spinal anesthesia inadequate for the planned surgery) were reported, and the frequency of complications during the procedure was identical in both groups. Frequency of postdural puncture headache (3.8%) or severity and duration showed no difference between the two groups. The overall assessment of postoperative complications revealed similar scores for both needles. CONCLUSIONS: Technical handling (ease with which block was performed) of the needles analyzed was extremely easy, showing a high success rate which associated with the similar incidence of complications. Type of bevel does not appear to be a determining factor in the quality or morbidity associated with subarachnoid block when fine-gauge needles are used in young patients.  相似文献   
17.
F. Lpez‐Medrano  J. T. Silva  M. Fernndez‐Ruiz  P. L. Carver  C. van Delden  E. Merino  M. J. Prez‐Saez  M. Montero  J. Coussement  M. de Abreu Mazzolin  C. Cervera  L. Santos  N. Sab  A. Scemla  E. Cordero  L. Cruzado‐Vega  P. L. Martín‐Moreno   . Len  E. Rudas  A. Ponce de Len  M. Arriola  R. Lauzurica  M. David  C. Gonzlez‐Rico  F. Henríquez‐Palop  J. Fortún  M. Nucci  O. Manuel  J. R. Pao‐Pardo  M. Montejo  P. Muoz  B. Snchez‐Sobrino  A. Mazuecos  J. Pascual  J. P. Horcajada  T. Lecompte  C. Lumbreras  A. Moreno  J. Carratal  M. Blanes  D. Hernndez  E. A. Hernndez‐Mndez  M. C. Farias  M. Perell‐Carrascosa  J. M. Morales  A. Andrs  J. M. Aguado   《American journal of transplantation》2016,16(7):2148-2157
Risk factors for invasive pulmonary aspergillosis (IPA) after kidney transplantation have been poorly explored. We performed a multinational case–control study that included 51 kidney transplant (KT) recipients diagnosed with early (first 180 posttransplant days) IPA at 19 institutions between 2000 and 2013. Control recipients were matched (1:1 ratio) by center and date of transplantation. Overall mortality among cases was 60.8%, and 25.0% of living recipients experienced graft loss. Pretransplant diagnosis of chronic pulmonary obstructive disease (COPD; odds ratio [OR]: 9.96; 95% confidence interval [CI]: 1.09–90.58; p = 0.041) and delayed graft function (OR: 3.40; 95% CI: 1.08–10.73; p = 0.037) were identified as independent risk factors for IPA among those variables already available in the immediate peritransplant period. The development of bloodstream infection (OR: 18.76; 95% CI: 1.04–339.37; p = 0.047) and acute graft rejection (OR: 40.73, 95% CI: 3.63–456.98; p = 0.003) within the 3 mo prior to the diagnosis of IPA acted as risk factors during the subsequent period. In conclusion, pretransplant COPD, impaired graft function and the occurrence of serious posttransplant infections may be useful to identify KT recipients at the highest risk of early IPA. Future studies should explore the potential benefit of antimold prophylaxis in this group.  相似文献   
18.
19.
Bilateral rupture of the patellar tendons is a rare lesion, usually associated with systemic diseases such as systemic lupus erythematosus, rheumatoid arthritis, chronic renal failure and others. It is extremely rare in a healthy individual, with fewer than 15 cases described. A case of a 32-year-old male with no known history of systemic disease or knee problems is presented. Physical examination, xrays and MRI demonstrated bilateral rupture of the patellar tendons. The tendons were repaired using a nonabsorbable suture reinforced with two titanium anchors fixed to each patella, and a quadriceps tendon flap. The evolution was satisfactory, with both knees recovering a full range of motion in a four-month period.  相似文献   
20.
ObjectiveWe analyzed the profile of patients who were candidates for neoadjuvant chemotherapy (NACT) in stage pT2-4aN0M0, the tolerability and adherence of our cisplatin-based protocol and oncological outcomes.Material and methodsRetrospective observational cohort study including patients diagnosed with muscle-invasive bladder carcinoma treated with NACT. Clinical, histopathological, therapeutic and evolutionary characteristics of the patients were analyzed. The use of NACT was evaluated by the complete response in the surgical specimen (pT0). This and other pathological factors were related to overall survival and progression-free survival.ResultsWe included 90 patients with muscle-invasive bladder carcinoma (clinical stage T2a-T4aN0M0) who received a cisplatin-based NACT regimen between January 2011 and December 2018, prior to radical surgery. Forty percent of patients presented an adverse reaction, with a compliance with the NACT regimen of 92.2%. There were no deaths related to systemic treatment and no adverse reaction to treatment made radical cystectomy impracticable. After performing radical cystectomy, the presence of complete response (pT0) was observed in 20 patients (21%), lower stage in the surgical specimen (<pT2) in 36 patients (40%), positive surgical margins in 7 patients (8%), lymph node involvement (N1) in 16 patients (17.8%). A shorter time to progression was observed in the group of patients who did not achieve a complete pathological response (53 months vs. 83.1 in pT0 patients, P = 0.012), in patients with lymph node involvement compared to pN0 (65.4 vs. 28, 2 months, P = 0.014) and in those with positive surgical margins compared to those with tumor-free margins (63.5 vs. 8.5 months, P = 0.021).ConclusionThe adequate selection of patients with muscle-invasive bladder carcinoma has shown a good tolerance to NACT, with a high compliance rate prior to RC. The improvement in the complete response rate implies a greater survival in this group of patients, with lymph node involvement and positive surgical margins being important prognostic factors.  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