全文获取类型
收费全文 | 23999篇 |
免费 | 1807篇 |
国内免费 | 106篇 |
专业分类
耳鼻咽喉 | 396篇 |
儿科学 | 839篇 |
妇产科学 | 379篇 |
基础医学 | 2444篇 |
口腔科学 | 535篇 |
临床医学 | 2184篇 |
内科学 | 5279篇 |
皮肤病学 | 562篇 |
神经病学 | 1287篇 |
特种医学 | 1155篇 |
外国民族医学 | 1篇 |
外科学 | 4584篇 |
综合类 | 384篇 |
一般理论 | 15篇 |
预防医学 | 1165篇 |
眼科学 | 822篇 |
药学 | 2064篇 |
中国医学 | 38篇 |
肿瘤学 | 1779篇 |
出版年
2023年 | 224篇 |
2022年 | 402篇 |
2021年 | 989篇 |
2020年 | 474篇 |
2019年 | 816篇 |
2018年 | 942篇 |
2017年 | 610篇 |
2016年 | 648篇 |
2015年 | 676篇 |
2014年 | 1020篇 |
2013年 | 1187篇 |
2012年 | 1747篇 |
2011年 | 1717篇 |
2010年 | 885篇 |
2009年 | 829篇 |
2008年 | 1295篇 |
2007年 | 1227篇 |
2006年 | 1147篇 |
2005年 | 990篇 |
2004年 | 890篇 |
2003年 | 753篇 |
2002年 | 651篇 |
2001年 | 593篇 |
2000年 | 554篇 |
1999年 | 494篇 |
1998年 | 189篇 |
1997年 | 170篇 |
1996年 | 167篇 |
1995年 | 160篇 |
1994年 | 126篇 |
1993年 | 115篇 |
1992年 | 272篇 |
1991年 | 284篇 |
1990年 | 252篇 |
1989年 | 223篇 |
1988年 | 213篇 |
1987年 | 226篇 |
1986年 | 195篇 |
1985年 | 190篇 |
1984年 | 114篇 |
1983年 | 130篇 |
1982年 | 90篇 |
1981年 | 76篇 |
1979年 | 129篇 |
1978年 | 81篇 |
1977年 | 71篇 |
1975年 | 61篇 |
1974年 | 65篇 |
1973年 | 88篇 |
1970年 | 59篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Prospective payment systems using the diagnostic related group (DRG) mechanism are being phased in for Medicare inpatient hospital care. The purpose of this study was to examine a common neurosurgical procedure (001), craniotomy without trauma, and characterize the cost dynamics of this DRG. All patients (n = 50) treated in this DRG at the Long Island Jewish Medical Center during 1983 had their financial charges exclusive of physician fees examined. The findings were: (a) each hospital service category had wide charge variances around the mean; (b) emergency (ER) admissions were 200% more expensive than nonemergency (non-ER) admissions; (c) ER admissions seemed to have no greater severity of illness than non-ER admissions, but had a significantly different referral pattern (i.e., admission from the ER to a nonneurosurgical service with a subsequent neurosurgical referral); (d) this DRG when grouped into clinical "subproducts" (i.e., craniotomy for tumor, hematoma, hydrocephalus, aneurysm, benign cyst, and other) showed marked charge differences; and (e) the most expensive 25% of patients had five times higher charges than the least expensive 25% for both ER and non-ER admissions. This type of financial analysis may give surgeons a methodology with which to address the problems of cost containment in a more serious manner. 相似文献
92.
Patel Shyam Kakouri Agni Chaudhary Shweta Knepper Paul A. Pfahler Nicholas M. Samples John Giovingo Michael 《Lasers in medical science》2021,36(3):605-609
Lasers in Medical Science - To evaluate the effect of various media and Iridex MicroPulse P3 (MP3) probe angles on the power output from the Cyclo G6 Glaucoma Laser (G6) System. A laser power meter... 相似文献
93.
94.
95.
Congenital constriction band syndrome has varied clinical presentations ranging from small, incomplete skin deep constriction band to in utero amputation. Pseudarthrosis of underlying bone most commonly tibia has been reported by many authors. We report the first case of congenital pseudarthrosis of the femur with congenital constriction band syndrome. Nine-day-old female presented with the constriction band in the left thigh with open pseudarthrosis of the femur. The left femur had gross recurvatum deformity and the posterior apex of the pseudarthrosis was exposed via skin ulceration. She had an ipsilateral paralytic clubfoot. She was treated with single-stage excision of constriction band and Z-plasty. Spontaneous union of the femur was achieved at 3 months. Procurvatum deformity of the femur improved gradually over 3 years. This happens to be the first and only reported case of congenital pseudarthrosis of the femur with sciatic nerve palsy due to congenital constriction band. 相似文献
96.
Yuki Bekki Josep Marti Takeo Toshima Sara Lewis Amita Kamath Pamela Argiriadi William Simpson Lucas Facciuto Rahul S. Patel Ganesh Gunasekaran Edward Kim Thomas D. Schiano Marcelo E. Facciuto 《Surgery》2021,169(5):1044-1051
BackgroundPortal vein embolization before liver resection is considered the therapy of choice for patients with inadequate future liver remnants. The concept of radioembolization with Yttrium-90 to achieve the same goal has limited data.MethodsWe retrospectively compared patients who underwent portal vein embolization and Yttrium-90 lobectomy before resection of hepatocellular carcinoma in patients with chronic liver disease.ResultsSeventy-three patients underwent portal vein embolization and 22 patients underwent Yttrium-90. Forty-seven percent of patients before portal vein embolization required additional procedures for tumor control, and 27% of patients after Yttrium-90 required additional procedure to mainly induce further hypertrophy. Both therapies achieved the goal of future liver remnants >40%, but the degree of hypertrophy was significantly higher in Yttrium-90 patients (63% for Yttrium-90, 36% for portal vein embolization, P < .01). Tumor response was significantly better with Yttrium-90, achieving complete response in 50% of patients. Resectability rate was higher after portal vein embolization (85% for portal vein embolization, 64% for Yttrium-90, P = .03). Tumor progression was the most common reason precluding surgery. Complete tumor control was the reason not to pursue surgery in 18% of patients after Yttrium-90.ConclusionBoth preoperative portal vein embolization and Yttrium-90, increases liver resectability rates by inducing hypertrophy of future liver remnants in patients with hepatocellular carcinoma and chronic liver disease. Yttrium-90 lobectomy achieved better tumor control and provided more time to assess therapy response, optimizing the indication for surgery. 相似文献
97.
Gaurang Nandkishor Vaidya Lawrence S.C. Czer Daniel Luthringer Michelle Kittleson Jignesh Patel David H. Chang Evan Kransdorf Dael Geft Babak Azarbal Michele Hamilton Jon Kobashigawa 《Transplantation proceedings》2021,53(1):348-352
BackgroundGiant cell myocarditis (GCM) has a poor prognosis without heart transplant, but post-transplant survival is unknown.PurposeTo describe the post-transplant survival of patients with GCM at a large transplant center.MethodsSeven patients underwent heart transplant for histologically confirmed GCM of the explanted heart. The median age was 59 years, and 43% (3 of 7) were female. All patients had cardiogenic shock, multiorgan failure, elevated troponin, and recurrent ventricular tachycardia, and some required mechanical circulatory support. All patients received rabbit antithymocyte globulin (rATG) in the perioperative period at a dose of 1.5 mg/kg daily for 1 to 5 days and 4 received intravenous immunoglobulin 1 g/kg daily for 2 days after rATG. All patients had early initiation of tacrolimus by first to third postoperative day depending on renal function, early mycophenolate, and high dose steroid. All were maintained using tacrolimus, mycophenolate, and prednisone.ResultsOne patient had asymptomatic recurrence of GCM at 3 months, managed by up-titration of tacrolimus, and had asymptomatic 2R cellular rejection at 4 months, managed with steroid bolus. No patient had high-grade rejection. One patient died at 267 days, possibly of GCM. Six of 7 (86%) remain alive at a median of 842 days (2.3 years) post transplant.ConclusionsPatients with GCM have excellent post-transplant survival with use of rATG and triple drug immunosuppressive therapy; however, some patients remain at risk for GCM recurrence after transplant, which may respond to augmented immunosuppression. 相似文献
98.
99.
100.
Rohit R. Badia Solomon Woldu Hiten D. Patel Nirmish Singla Arnav Srivastava Joseph G. Cheaib Phillip M. Pierorazio Aditya Bagrodia 《Urologic oncology》2021,39(2):136.e19-136.e25
BackgroundThe American Joint Committee on Cancer 8th edition staging guidelines for testicular cancer established a 3 cm cutoff to subclassify stage T1 seminomas (<3 cm = pT1a and ≥3 cm = pT1b). The efficacy of this cutoff in predicting metastatic disease and impact on treatment patterns have not been studied.MethodsWe retrospectively reviewed patients with pT1 testicular seminoma in the National Cancer Database from 2004 to 2016. Receiver operating curves were used to determine the efficacy of the 3 cm tumor cutoff in identifying metastatic disease, and multivariable regression was used to compute the effect of tumor size on the rate of adjuvant therapy among Stage I patients.ResultsA total of 10,134 patients with pT1 seminoma were evaluated. The current size cutoff of 3 cm for subclassification did not exhibit high discrimination in identifying metastatic disease (area under receiver operating curve: 0.546). Surveillance has grown as the preferred treatment after orchiectomy ?32.1% in 2004 to 81.2% in 2015. However, the rate of adjuvant therapy for pT1, Stage I seminomas associated positively with tumor size even with adjustment for year of diagnosis. For tumors above 3 cm, the odds ratio stabilized around 1.9. By using the 3 cm cutoff to guide adjuvant therapy, up to 85% of T1b patients may be overtreated.ConclusionThe 3 cm cutoff for subclassification of Stage I seminoma does not predict metastatic recurrence but is associated with increased receipt of adjuvant therapy. A 3 cm cutoff and the pT1a/b classification may therefore contribute to overtreatment in many young patients with a long life expectancy for whom minimizing adverse effects should be prioritized. 相似文献