全文获取类型
收费全文 | 4823篇 |
免费 | 428篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 39篇 |
儿科学 | 100篇 |
妇产科学 | 117篇 |
基础医学 | 491篇 |
口腔科学 | 88篇 |
临床医学 | 584篇 |
内科学 | 986篇 |
皮肤病学 | 55篇 |
神经病学 | 602篇 |
特种医学 | 134篇 |
外科学 | 678篇 |
综合类 | 130篇 |
一般理论 | 7篇 |
预防医学 | 520篇 |
眼科学 | 56篇 |
药学 | 354篇 |
中国医学 | 3篇 |
肿瘤学 | 315篇 |
出版年
2023年 | 36篇 |
2022年 | 54篇 |
2021年 | 137篇 |
2020年 | 77篇 |
2019年 | 119篇 |
2018年 | 136篇 |
2017年 | 93篇 |
2016年 | 112篇 |
2015年 | 86篇 |
2014年 | 145篇 |
2013年 | 215篇 |
2012年 | 258篇 |
2011年 | 272篇 |
2010年 | 181篇 |
2009年 | 146篇 |
2008年 | 232篇 |
2007年 | 253篇 |
2006年 | 206篇 |
2005年 | 183篇 |
2004年 | 181篇 |
2003年 | 202篇 |
2002年 | 142篇 |
2001年 | 114篇 |
2000年 | 132篇 |
1999年 | 119篇 |
1998年 | 39篇 |
1997年 | 44篇 |
1996年 | 31篇 |
1995年 | 32篇 |
1992年 | 82篇 |
1991年 | 77篇 |
1990年 | 60篇 |
1989年 | 67篇 |
1988年 | 59篇 |
1987年 | 49篇 |
1986年 | 50篇 |
1985年 | 65篇 |
1984年 | 64篇 |
1983年 | 55篇 |
1982年 | 45篇 |
1981年 | 30篇 |
1980年 | 35篇 |
1979年 | 56篇 |
1978年 | 52篇 |
1977年 | 54篇 |
1976年 | 43篇 |
1975年 | 31篇 |
1974年 | 36篇 |
1973年 | 37篇 |
1968年 | 28篇 |
排序方式: 共有5259条查询结果,搜索用时 15 毫秒
51.
OBJECTIVE: To evaluate, in a preliminary study, the outcome of a modified pubovaginal sling operation with titanium bone anchors for recurrent genuine stress urinary incontinence (GSI) in women. PATIENTS AND METHODS: This prospective study included 13 consecutive women who underwent the modified sling procedure between September 1994 and August 1996. The subjective and objective cure of urinary stress incontinence, and the occurrence of postoperative osteitis pubis, were assessed. RESULTS: All 13 patients subjectively claimed complete urinary continence and 12 were objectively cured (12 patients agreed to undergo a repeat urodynamic study) during a median (range) follow-up of 26 (19-38) months. There were no cases of postoperative osteitis pubis, bladder injury or major complications. Mild suprapubic pain was a frequent and self-limiting complication. CONCLUSIONS: This innovative modified sling procedure is effective for recurrent urinary stress incontinence, with no complication of osteitis pubis. We suggest that this procedure should be considered as a treatment for recurrent GSI and perhaps for primary GSI. A study incorporating a longer follow-up and more patients has been planned. 相似文献
52.
Liver transplantation: MR angiography with surgical validation 总被引:6,自引:0,他引:6
J P Finn R R Edelman R L Jenkins W D Lewis H E Longmaid R A Kane K R Stokes H P Mattle M E Clouse 《Radiology》1991,179(1):265-269
Thirty patients (mean age, 45 years) were evaluated with magnetic resonance (MR) angiography before liver transplantation to assess the accuracy of MR angiography. A series of breath-hold, two-dimensional images were acquired and subsequently processed to form three-dimensional projection angiograms. Graphic information on blood flow in the portal vein was acquired by using presaturation bolus tracking. Correlative duplex ultrasound (US) was performed in 28 patients, and surgical or autopsy correlation was available in all cases. MR angiography demonstrated patency of the portal vein in 26 (96%) of 27 patients, made possible the diagnosis of portal venous occlusion in three of three patients, depicted reversed portal flow in one patient, and provided clear delineation of the extent of varices and specific portosystemic collateral vessels. When duplex US was successful, there was full agreement with MR angiographic results in assessing portal vein patency and flow direction. All of the MR findings were corroborated at surgical exploration or autopsy. The authors conclude that MR angiography is very accurate in the portal system and is valuable in preoperative assessment for liver transplantation. 相似文献
53.
Goetzl MA Goluboff ET Murphy AM Katz AE Mansukhani M Sawczuk IS Olsson CA Benson MC McKiernan JM 《Urologic oncology》2004,22(3):182-187
BACKGROUND: Metastatic renal cell carcinoma (RCC) is an aggressive entity that frequently invades the venous system. We evaluated the morbidity and survival of patients with tumor thrombus who undergo cytoreductive nephrectomy. MATERIALS AND METHODS: We identified 56 patients from our institution's database who had a primary renal tumor in place and documented metastases at the time of surgery. We reviewed demographic and pathologic characteristics from these patients as well as complications and overall survival. RESULTS: Median age was 58 (37-77). There were 33 patients (59%) who had tumor thrombus with 21 (64%) involving the renal vein, 10 (30%) involving the infradiaphragmatic inferior vena cava (IVC), and 2 (6%) involving the supradiaphragmatic IVC. Median tumor size for thrombus patients was 12 cm (5-29). There were 8 (14.2%) who had complications, including 1 death. Thrombus patients were significantly more likely to have a complication (P = 0.008). Median survival for all patients was 10.7 months (0.3-61). There was no significant difference in overall survival between patients with and without thrombus (P = 0.76). CONCLUSIONS: Patients who undergo cytoreductive nephrectomy with a tumor thrombus have a higher rate of complications as compared to patients undergoing cytoreductive nephrectomy without tumor thrombus. The long-term survival, however, was not statistically different and thus aggressive surgery for select metastatic RCC patients is warranted. 相似文献
54.
Alana J. Coleman Beverly Brozanski Burhan Mahmood Peter D. Wearden Douglas Potoka Bradley A. Kuch 《Journal of pediatric surgery》2013
Background/Purpose
Early clinical predictors for the use of ECMO in patients with congenital diaphragmatic hernia (CDH) are lacking. We sought to evaluate the first 24-h SNAP-II score and highest PaCO2 as predictors of ECMO support and in-hospital mortality in neonates with CDH.Methods
Retrospective review of 47 consecutive neonates with CDH admitted to our institution from January 2007 to December 2010 was performed. Covariates of ECMO use including SNAP-II score and highest PaCO2 within the first 24 h of NICU admission were evaluated.Results
Of the 47 infants in this study, 24 patients were supported with ECMO. The ECMO group had a higher incidence of pulmonary hypertension, higher PaCO2, and higher 24-h SNAP-II scores. Only the SNAP-II score and not highest PaCO2 predicted mortality following multivariate adjustment.Conclusions
The first 24-h SNAP-II score and highest PaCO2 may provide some prognostic value in identifying neonates who undergo ECMO support; however neither measure was independently associated with the use of therapy. Only the SNAP-II score was associated with in-hospital mortality following multivariate adjustment. Additional study is needed to validate these results in a larger data set. 相似文献55.
David Walling Stephen R. Marder John Kane W. Wolfgang Fleischhacker Richard S. E. Keefe David A. Hosford Chris Dvergsten Anthony C. Segreti Jessica S. Beaver Steven M. Toler John E. Jett Geoffrey C. Dunbar 《Schizophrenia bulletin》2016,42(2):335-343
Objectives:
This trial was conducted to test the effects of an alpha7 nicotinic receptor full agonist, TC-5619, on negative and cognitive symptoms in subjects with schizophrenia.Methods:
In 64 sites in the United States, Russia, Ukraine, Hungary, Romania, and Serbia, 477 outpatients (18–65 years; male 62%; 55% tobacco users) with schizophrenia, treated with a new-generation antipsychotic, were randomized to 24 weeks of placebo (n = 235), TC-5619, 5mg (n = 121), or TC-5619, 50mg (n = 121), administered orally once daily. The primary efficacy measure was the Scale for the Assessment of Negative Symptoms (SANS) composite score. Key secondary measures were the Cogstate Schizophrenia Battery (CSB) composite score and the University of California San Diego Performance-Based Skills Assessment-Brief Version (UPSA-B) total score. Secondary measures included: Positive and Negative Syndrome Scale in Schizophrenia (PANSS) total and subscale scores, SANS domain scores, CSB item scores, Clinical Global Impression-Global Improvement (CGI-I) score, CGI-Severity (CGI-S) score, and Subject Global Impression-Cognition (SGI-Cog) total score.Results:
SANS score showed no statistical benefit for TC-5619 vs placebo at week 24 (5mg, 2-tailed P = .159; 50mg, P = .689). Likewise, no scores of CSB, UPSA-B, PANSS, CGI-I, CGI-S, or SGI-Cog favored TC-5619 (P > .05). Sporadic statistical benefit favoring TC-5619 in some of these outcome measures were observed in tobacco users, but these benefits did not show concordance by dose, country, gender, or other relevant measures. TC-5619 was generally well tolerated.Conclusion:
These results do not support a benefit of TC-5619 for negative or cognitive symptoms in schizophrenia.Key words: schizophrenia, negative symptoms, cognition 相似文献56.
Mortazavi SM R Greenky M Bican O Kane P Parvizi J Hozack WJ 《The Journal of arthroplasty》2012,27(1):31-36
Salvage total hip arthroplasty (THA) presents a viable solution for failed open reduction internal fixation. This study compares salvage THA in patients with prior femoral neck fractures vs patients with prior intertrochanteric fractures. One hundred fifty-four hips in 152 patients underwent conversion from open reduction internal fixation to THA. Eighty-three patients had previous femoral neck fractures, and 69 patients (71 hips) had prior intertrochanteric fractures. Salvage THA in patients with prior intertrochanteric fractures presented a more technically demanding procedure with longer operative times and larger amounts of blood loss. Although conversion THA presents a technically challenging procedure, it is safe and yields relatively few orthopedic complications. 相似文献
57.
Sohail R. Shah George K. Gittes Katherine A. Barsness Timothy D. Kane 《Surgical endoscopy》2009,23(1):215-215
Purpose Minimally invasive techniques continue to expand in pediatric surgery; however, there has been some debate over the appropriate
operative technique for the management of congenital diaphragmatic hernias in neonates [1–3]. We present a video of a thoracoscopic patch repair of a right-sided Bochdalek congenital diaphragmatic hernia (CDH) in
a 3-day-old male.
Methods Our patient was noted to have a right-sided CDH on chest X-ray following respiratory distress at the time of birth. The patient’s
remaining neonatal workup also confirmed hypoplastic transverse aortic arch with coarctation, ventricular septal defect (VSD),
and patent ductus arteriosus, which were initially diagnosed by prenatal ultrasound. After monitoring the patient for hemodynamic
stability and discussion with the family and involved pediatric cardiothoracic surgeons, the decision was made to proceed
with a thoracoscopic repair of the CDH.
Results The large right-sided CDH was noted to involve herniated small bowel, colon, and liver. The diaphragmatic defect was successfully
repaired thoracoscopically using a 5 × 5 cm polytetrafluoroethylene (PTFE) patch. The patient was extubated on the second
postoperative day and ultimately underwent aortic arch augmentation, VSD closure, and patent ductus arteriosus ligation and
division at 1 month of age. There has been no evidence of CDH recurrence in follow-up.
Conclusions As demonstrated by our video, large right-sided congenital diaphragmatic hernias requiring patch repair can be successfully
repaired thoracoscopically with appropriate surgeon comfort and experience. This minimally invasive approach may also be used
in neonates with associated cardiac defects with appropriate cardiothoracic surgical consultation and support. To our knowledge
this is the first reported case of a thoracoscopic repair of a Bochdalek (posterolateral) hernia with a prosthetic patch in
a neonate with significant congenital cardiac anomalies.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
58.
59.
Sagar R. Shah Stephen J. Freedland William J. Aronson Christopher J. Kane Joseph C. Presti Jr Christopher L. Amling Martha K. Terris 《BJU international》2009,103(9):1168-1172
OBJECTIVE
To investigate and report the clinicopathological characteristics and outcomes after radical prostatectomy (RP) in patients with prostate cancer and previous exposure to Agent Orange (AO), particularly in relationship to race.PATIENTS AND METHODS
In 1495 veterans who had undergone RP the clinicopathological characteristics, biochemical progression rates, and prostate‐specific antigen (PSA) doubling time (DT) after recurrence between AO‐exposed and unexposed men were compared using logistic and linear regression and Cox proportional hazards analyses, and stratified by race.RESULTS
The 206 (14%) men with AO exposure were more likely to be black (P = 0.001), younger (P < 0.001), treated more recently (P < 0.001), have a higher body mass index (P = 0.001), have clinical stage T1 disease (P < 0.001), and have lower preoperative PSA levels (P = 0.001). After adjusting for several clinical characteristics, AO exposure was not significantly related to adverse pathological features but was significantly associated with biochemical progression risk (relative risk 1.55, 95% confidence interval 1.15–2.09, P = 0.004) and shorter PSADT (P < 0.001) after recurrence (8.2 vs 18.6 months). When stratified by race, these associations were present and similar in both races, with no significant interaction between race and AO exposure for predicting biochemical recurrence or mean adjusted PSADT (P interaction >0.20).CONCLUSIONS
Patients with AO exposure and treated with RP were more likely to be black, present with lower risk features, have an increased risk of biochemical progression, and shorter PSADT after recurrence. When stratified by race, the association between AO exposure and poor outcomes was present in both races. These findings suggest that among selected men who choose RP, AO exposure might be associated with more aggressive prostate cancer. 相似文献60.
Kathleen F Carlson Timothy J Wilt Brent C Taylor Gary D Goldish Catherine B Niewoehner Tatyana A Shamliyan Robert L Kane 《The journal of spinal cord medicine》2009,32(4):361-378