全文获取类型
收费全文 | 6486篇 |
免费 | 425篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 119篇 |
儿科学 | 334篇 |
妇产科学 | 102篇 |
基础医学 | 687篇 |
口腔科学 | 92篇 |
临床医学 | 491篇 |
内科学 | 1444篇 |
皮肤病学 | 122篇 |
神经病学 | 376篇 |
特种医学 | 138篇 |
外科学 | 1104篇 |
综合类 | 117篇 |
一般理论 | 3篇 |
预防医学 | 510篇 |
眼科学 | 271篇 |
药学 | 582篇 |
中国医学 | 19篇 |
肿瘤学 | 417篇 |
出版年
2023年 | 57篇 |
2022年 | 119篇 |
2021年 | 241篇 |
2020年 | 135篇 |
2019年 | 183篇 |
2018年 | 230篇 |
2017年 | 149篇 |
2016年 | 190篇 |
2015年 | 201篇 |
2014年 | 271篇 |
2013年 | 315篇 |
2012年 | 437篇 |
2011年 | 423篇 |
2010年 | 258篇 |
2009年 | 232篇 |
2008年 | 371篇 |
2007年 | 424篇 |
2006年 | 411篇 |
2005年 | 362篇 |
2004年 | 344篇 |
2003年 | 313篇 |
2002年 | 239篇 |
2001年 | 124篇 |
2000年 | 85篇 |
1999年 | 66篇 |
1998年 | 59篇 |
1997年 | 34篇 |
1996年 | 50篇 |
1995年 | 22篇 |
1994年 | 32篇 |
1993年 | 31篇 |
1992年 | 41篇 |
1991年 | 40篇 |
1990年 | 35篇 |
1989年 | 33篇 |
1988年 | 44篇 |
1987年 | 40篇 |
1986年 | 35篇 |
1985年 | 20篇 |
1984年 | 28篇 |
1983年 | 19篇 |
1982年 | 13篇 |
1981年 | 16篇 |
1980年 | 15篇 |
1977年 | 12篇 |
1975年 | 14篇 |
1973年 | 14篇 |
1971年 | 11篇 |
1970年 | 19篇 |
1968年 | 14篇 |
排序方式: 共有6928条查询结果,搜索用时 0 毫秒
101.
This is an overview of radiological imaging of the hand highlighting the various imaging modalities used in the work-up and diagnosis of a range of orthopaedic and rheumatological disorders. The biomechanics and anatomy of the human hand is extremely complex, and a good understanding is required to diagnose pathology. In this article we explain the anatomy and highlight pathology of the hand from a radiological perspective with respect to plain film, CT, ultrasound and MR imaging. Trauma of the hand is extremely common and radiology plays an important role in the diagnosis of treatable injuries including fractures, dislocations and ligament tears. Plain radiography and CT are excellent at evaluating bony injury (e.g. Rolondo or Bennett's fracture) whereas ultrasound and MR are better at evaluating soft tissue injury (e.g. Stener lesion). The hands are a common location for degenerate and inflammatory arthropathies which all have hallmark radiological features. Radiology also plays an important role in the diagnosis and work-up of bone lesions in the hand including enchondromas, osteoid osteomas and chondrosarcomas. 相似文献
102.
Alessandra Ferraro Anna Morena D’Alise Towfique Raj Natasha Asinovski Roxanne Phillips Ayla Ergun Joseph M. Replogle Angelina Bernier Lori Laffel Barbara E. Stranger Philip L. De Jager Diane Mathis Christophe Benoist 《Proceedings of the National Academy of Sciences of the United States of America》2014,111(12):E1111-E1120
103.
Jennifer S. Ringrose Raj Bapuji Wade Coutinho Omar Mouhammed Lindsay Bridgland Thirza Carpenter Raj Padwal 《Journal of clinical hypertension (Greenwich, Conn.)》2020,22(1):16-20
Use of 24‐hour ambulatory blood pressure monitoring is strongly endorsed by contemporary hypertension guidelines. The objective of this study was to assess patient perceptions of ambulatory blood pressure testing, tolerability, accessibility, and expense. A convenience sample of 50, consenting patients undergoing ambulatory blood pressure monitoring at the University of Alberta Hypertension Clinic in Edmonton, Canada was studied. A 16‐item structured questionnaire was administered in person or electronically. Questions regarding the tolerability of ambulatory monitoring were evaluated using a 5‐point Likert scale and wait times, expenditures, and willingness to pay were evaluated by direct questioning. Mean age was 53.1 ± 15.4 years, 32 (64%) were female, and 23 (46%) were employed. Mean 24‐hour ambulatory BP was 134 ± 12/79 ± 8 mmHg. Ambulatory monitoring caused discomfort in 40 (80%) patients and disturbed sleep in 39 (78%). Forty‐one (82%) patients perceived that the home (vs pharmacy, primary care clinic, and speciality care clinic) would be the easiest venue to access future testing. On average, patients waited 27.3 ± 23.7 days for testing; they felt that a wait time of 21.3 ± 12.3 days was appropriate. Mean time taken off work was 8.6 ± 10.8 hours. Twelve (24%) patients indicated that they would be willing to pay out‐of‐pocket to undergo testing sooner, at a mean expenditure of $120 ± 69. Nineteen (62%) patients were willing to buy a monitor and felt that a mean purchase cost of $125 ± 89 was appropriate. These findings extend current knowledge of patient perceptions of ambulatory monitoring and may help to refine and optimize future delivery of this essential test. 相似文献
104.
Samuel Quan Guanmin Chen Raj S. Padwal Finlay A. McAlister Karen C. Tran Norman R. C. Campbell Zhiying Liang Yuanchao Feng Doreen M. Rabi Alexander A. Leung for Hypertension Canadas Research Evaluation Committee 《Journal of clinical hypertension (Greenwich, Conn.)》2020,22(11):2077
Clinical practice guidelines recommend several routine laboratory tests in patients diagnosed with hypertension. However, the rates of clinically relevant laboratory abnormalities are unknown. Therefore, we conducted a retrospective cohort study using administrative and laboratory data of patients diagnosed with hypertension between April 2010 and March 2015 in Alberta, Canada. Laboratory investigations for renal function, serum electrolytes (sodium and potassium), low‐density lipoprotein (LDL) cholesterol, and diabetes (fasting blood glucose and hemoglobin A1c), measured within 1 year of diagnosis, were examined, and the frequency of abnormalities determined. A total of 225 296 cases of incident hypertension were identified. Of these, 74.3% received at least one of the four guideline‐recommended laboratory tests, but only 42.3% received all four tests. Patients who received any testing, compared to subjects who did not, were on average older (median age 55.9 vs 51.2 years, P < .001) and had more comorbidity (14.5% vs 2.8% with a Charlson comorbidity index ≥ 3, P < .001). Laboratory abnormalities with the potential to affect clinical decision‐making were more common among multi‐comorbid patients. Patients with renal dysfunction (6.7% vs 11.6%, 26.3%, P < .001), electrolyte abnormalities (9.8% vs 12.6%, 20.5%, P < .001), and diabetes (13.4% vs 25.1% vs 38.8%, P < .001) were found in patients with Charlson scores of 0 vs 1‐2 vs ≥3, respectively. Our study found most patients diagnosed with hypertension received some laboratory testing, but rates of laboratory testing and frequency of abnormalities varied by clinical context. Testing and abnormalities detected were both more common among older patients and patients with comorbidities. 相似文献
105.
Tetralogy of Fallot with restrictive ventricular septal defect by accessory tricuspid leaflet tissue
In tetralogy of Fallot septal defect is usually large because of malalignment of outlet septum, restrictive defect has been reported rarely. We present a case of tetralogy of Fallot with accessory tricuspid leaflet tissue restricting ventricular septal defect. The report includes echocardiographic and catheter images of this rare presentation of tetralogy of Fallot. 相似文献
106.
107.
Pneumosinus dilatans (PD) represents a rare lesion of unknown etiology in which progressive enlargement of an air-filled paranasal sinus results in cosmetic and functional complications. The absence of pathologic mucosa has traditionally been considered a hallmark of this disorder. A 24-year-old man presented with 2 years of chronic rhinosinusitis and recurrent, acute episodes of severe forehead pain with worsening outward prominence of the frontal sinus during air travel. Computed tomography and findings at surgery were notable for diffuse nonpolypoid inflammatory changes of the paranasal sinuses, a type III frontal sinus cell, and PD of the frontal sinus with severe deformity and thinning of the anterior table. A bicoronal approach was used for frontal sinus obliteration and cranioplasty. Excellent cosmetic and functional results were noted at the last follow-up. To our knowledge, this is the first report of PD frontalis presenting in the setting of chronic rhinosinusitis. Surgical management of this disorder requires consideration of both the functional and cosmetic issues. 相似文献
108.
109.
110.