全文获取类型
收费全文 | 21767篇 |
免费 | 1314篇 |
国内免费 | 86篇 |
专业分类
耳鼻咽喉 | 299篇 |
儿科学 | 565篇 |
妇产科学 | 357篇 |
基础医学 | 2961篇 |
口腔科学 | 474篇 |
临床医学 | 2392篇 |
内科学 | 4639篇 |
皮肤病学 | 477篇 |
神经病学 | 2013篇 |
特种医学 | 1068篇 |
外国民族医学 | 3篇 |
外科学 | 3290篇 |
综合类 | 198篇 |
一般理论 | 8篇 |
预防医学 | 1313篇 |
眼科学 | 586篇 |
药学 | 1403篇 |
中国医学 | 36篇 |
肿瘤学 | 1085篇 |
出版年
2023年 | 118篇 |
2022年 | 231篇 |
2021年 | 458篇 |
2020年 | 292篇 |
2019年 | 432篇 |
2018年 | 535篇 |
2017年 | 363篇 |
2016年 | 480篇 |
2015年 | 588篇 |
2014年 | 689篇 |
2013年 | 881篇 |
2012年 | 1395篇 |
2011年 | 1387篇 |
2010年 | 846篇 |
2009年 | 751篇 |
2008年 | 1269篇 |
2007年 | 1288篇 |
2006年 | 1213篇 |
2005年 | 1140篇 |
2004年 | 975篇 |
2003年 | 973篇 |
2002年 | 842篇 |
2001年 | 328篇 |
2000年 | 274篇 |
1999年 | 310篇 |
1998年 | 186篇 |
1997年 | 196篇 |
1996年 | 144篇 |
1995年 | 140篇 |
1994年 | 134篇 |
1993年 | 113篇 |
1992年 | 185篇 |
1991年 | 186篇 |
1990年 | 154篇 |
1989年 | 163篇 |
1988年 | 158篇 |
1987年 | 156篇 |
1986年 | 139篇 |
1985年 | 141篇 |
1984年 | 144篇 |
1983年 | 121篇 |
1982年 | 102篇 |
1981年 | 89篇 |
1980年 | 96篇 |
1979年 | 105篇 |
1978年 | 87篇 |
1976年 | 65篇 |
1975年 | 65篇 |
1974年 | 65篇 |
1971年 | 65篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Early detection of prosthetic-hip loosening. Comparison of low- and high-viscosity bone cement 总被引:1,自引:0,他引:1
In 1987, we reported the 1-year migration of the prosthetic components in 16 hips followed by roentgen stereophotogrammetry after fixation with either low- or high-viscosity cement. We now report the migration of these prosthetic components during another 2 postoperative years. Eight acetabular components, four in each group, migrated cranially; and four femoral components, three in the low-viscosity and one in the high-viscosity group, migrated distally. All but two migrations were obvious 4 months postoperatively, which indicates that what is called late loosening is the result of late detection rather than of late occurrence of loosening. Low-viscosity cement did not provide improved prosthetic fixation. 相似文献
92.
93.
Adrian Ooi Narain Moorjani Giedrius Baliulis Barry R. Keeton Anthony P. Salmon James L. Monro Marcus P. Haw 《European journal of cardio-thoracic surgery》2006,30(6):917-922
Objective: To assess the impact of early corrective surgery on the short and medium term outcome in tetralogy of Fallot (TOF). Materials and methods: All patients under 12 months of age undergoing correction of isolated TOF between February 1997 and July 2003 were reviewed retrospectively. Outcome data for mortality, post-operative care management, major morbidity and clinical follow-up were analysed. Results: Fifty-two operations were performed. The mean age at surgery was 5 months (range 1–12) of whom 16 (30.8%) were less than 3 months old, including 2 neonates, 22 (42.3%) were 3–6 months old and 14 (26.9%) were 7–12 months old. There was 1 (1.9%) early death caused by a cerebro-vascular accident and 1 (1.9%) late death secondary to acute infective endocarditis. There were no differences in post-operative morbidities attributable to age. Patients under 3 months old required greater duration of post-operative ventilation, ITU stay and in-hospital stay. At a mean follow-up of 4.0 years (range 1.5–8.0), 33 (63.5%) patients had well-tolerated pulmonary regurgitation (PR) and 3 (5.8%) patients required re-operation for right ventricular outflow tract obstruction (RVOTO). All patients had right bundle-branch-block but with QRS < 150 ms. Conclusion: Early definitive repair of TOF can be performed safely on patients under 6 months old. Age at surgery does not appear to affect the medium term haemodynamic outcome. However, early surgery does escalate the need for ICU care. This data suggests repair in asymptomatic patients be delayed until 3–6 months of age. 相似文献
94.
95.
96.
97.
T. W. Bax D. R. Marcus G. Q. Galloway L. L. Swanstrom B. C. Sheppard 《Surgical endoscopy》1996,10(12):1150-1153
Background: Laparoscopic adrenalectomy has recently been shown to be a safe and effective means of treating adrenal pathology with much
lower morbidity than the traditional approach. The majority of reports in the literature involve removal of adrenal tumors.
Although open bilateral adrenalectomy has been utilized for persistent Cushing's syndrome following attempted hypophysectomy,
there is little data available describing the application of laparoscopic adrenal surgery to this problem.
Methods: Four patients with persistent Cushing's syndrome after attempted treatment with hypophysectomy underwent laparoscopic bilateral
adrenalectomy at our institution. One procedure was done transabdominally in the supine position. Three procedures were done
transabdominally using sequential lateral decubitus positions.
Results: All procedures were completed laparoscopically. The mean operative time was 4.6 h (range 3.9–5.25). Repositioning and reprepping
the patients resulted in a slight increase in operative time, but visualization was improved using the lateral decubitus position.
Average blood loss: 156 cc (range 50–300). One patient required early reoperation for bleeding from the left adrenal bed,
which was controlled laparoscopically. Three patients were eating the following day and were discharged on postoperative days
1, 2, and 5. The fourth patient remained hospitalized for 18 days due to problems unrelated to surgery. After a mean follow-up
of 10 months, all patients have done well and have no clinical or biochemical evidence of recurrent disease.
Conclusion: Our clinical experience indicates that laparoscopic bilateral adrenalectomy is a viable treatment option for Cushing's syndrome
following failed hypophysectomy.
Received: 29 March 1996/Accepted: 12 June 1996 相似文献
98.
Secondary hyperparathyroidism and acute tubular necrosis following renal transplantation 总被引:3,自引:2,他引:1
Traindl O.; Langle F.; Reading S.; Franz M.; Watschinger B.; Klauser R.; Woloszczuk W.; Kovarik J. 《Nephrology, dialysis, transplantation》1993,8(2):173-176
In the present study we investigated the relationship betweensecondary hyperparathyroidism in renal graft recipients andpost-transplantation acute tubular necrosis (ATN). Patientswere divided into two groups according to graft function: groupA consisted of 28 patients who had an uneventful postoperativeperiod and did not require haemodialysis. Group B comprised26 patients with primary non-function of the graft due to biopsy-provenATN who required continued haemodialysis for the first postoperativeweek or longer (mean 14.2 ±8.7 days). Both groups hadcomparable donor characteristics, HLA-matching and ischaemiatimes. All patients were given cyclospo-rin and low-dose prednisolonefor immunosuppression. Pretransplant levels of intact PTH weresignificantly greater in group B than in group A (203.5 ±193.1pg/ml versus 81.7±45.2 pg/ml, P<0.01). Group B patientshad more transplant biopsies (50 versus 7) and a longer hospitalizationtime (33.4 ± 10.9 days versus 21.9 ± 11.9 days,P<0.01), although serum creatinine on the day of dischargewas higher in group B (1.77 ± 0.51 mg/dl versus 1.5±0.45mg/dl, P<0.05). We conclude that patients with secondaryhyperparathyroidism as assessed by measuring circulating levelsof intact PTH have an increased incidence of ATN. 相似文献
99.
Flat adenomas in a colon cancer-prone kindred 总被引:9,自引:0,他引:9
H T Lynch T Smyrk S J Lanspa J N Marcus M Kriegler J F Lynch H D Appelman 《Journal of the National Cancer Institute》1988,80(4):278-282
We describe new pathologic findings in a hereditary nonpolyposis colorectal cancer family. Affected family members developed multiple small adenomas with right-sided predominance; many adenomas had an unusual appearance featuring slightly elevated lesions with adenomatous changes confined to the upper regions of the colonic crypts. We have adopted the previously established term "flat adenoma" for these lesions. This phenotype may be a morphologic marker for at least one subset of hereditary nonpolyposis colorectal cancer. 相似文献
100.
A 1975 report stated that a schizophrenic genotype may be manifested in infants by a neurointegrative defect called pandysmaturation. Recent evidence supports this: (1) 12 studies found delayed development in schizophrenics' infants and in preschizophrenics; (2) "blind" psychometric evaluations favored an adult schizotypal disorder in four to six of seven high-risk subjects with pandysmaturation in the New York study; and (3) finally, in a partial replication of this method using the Jerusalem data, blind diagnoses of "probable" and "possible" pandysmaturation were significantly related to a parental diagnosis of schizophrenia and to cognitive and motor neurointegrative deficits at 10 years. Obstetrical complications were unrelated to diagnosis, pandysmaturation, or outcome in the overall sample. However, we found a small subgroup of schizophrenic offspring in whom the most severe motor deficits at follow-up were related to obstetrical complications, pandysmaturation, and low birth weight. 相似文献