全文获取类型
收费全文 | 2898篇 |
免费 | 161篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 67篇 |
儿科学 | 232篇 |
妇产科学 | 32篇 |
基础医学 | 290篇 |
口腔科学 | 69篇 |
临床医学 | 174篇 |
内科学 | 615篇 |
皮肤病学 | 71篇 |
神经病学 | 216篇 |
特种医学 | 182篇 |
外国民族医学 | 1篇 |
外科学 | 462篇 |
综合类 | 105篇 |
一般理论 | 1篇 |
预防医学 | 113篇 |
眼科学 | 118篇 |
药学 | 124篇 |
中国医学 | 9篇 |
肿瘤学 | 186篇 |
出版年
2022年 | 22篇 |
2021年 | 68篇 |
2020年 | 33篇 |
2019年 | 51篇 |
2018年 | 62篇 |
2017年 | 43篇 |
2016年 | 52篇 |
2015年 | 84篇 |
2014年 | 104篇 |
2013年 | 160篇 |
2012年 | 155篇 |
2011年 | 176篇 |
2010年 | 124篇 |
2009年 | 101篇 |
2008年 | 120篇 |
2007年 | 141篇 |
2006年 | 134篇 |
2005年 | 85篇 |
2004年 | 77篇 |
2003年 | 80篇 |
2002年 | 88篇 |
2001年 | 51篇 |
2000年 | 51篇 |
1999年 | 50篇 |
1998年 | 57篇 |
1997年 | 45篇 |
1996年 | 40篇 |
1995年 | 42篇 |
1994年 | 25篇 |
1993年 | 26篇 |
1992年 | 46篇 |
1991年 | 43篇 |
1990年 | 59篇 |
1989年 | 56篇 |
1988年 | 46篇 |
1987年 | 38篇 |
1986年 | 32篇 |
1985年 | 27篇 |
1984年 | 32篇 |
1983年 | 31篇 |
1981年 | 21篇 |
1980年 | 21篇 |
1979年 | 25篇 |
1978年 | 19篇 |
1976年 | 23篇 |
1974年 | 19篇 |
1973年 | 18篇 |
1972年 | 16篇 |
1969年 | 20篇 |
1968年 | 24篇 |
排序方式: 共有3067条查询结果,搜索用时 15 毫秒
41.
Rajiv Bharat Kharwar M.D. Rishi Sethi M.D. D.M. F.A.C.C. Varun Shankar Narain M.D. D.M. 《Echocardiography (Mount Kisco, N.Y.)》2013,30(10):E322-E325
Endomyocardial fibrosis is a form of restrictive cardiomyopathy mainly affecting poor children and young adults in geographically restricted areas of Latin America, Africa, and Southeast Asia. The pathophysiological hallmark of the disease is focal or diffuse endocardial thickening involving mainly the inflow, the apices, and the subvalvular region leading to valvular regurgitation, diastolic dysfunction and obliteration of the ventricular apex. Advanced right‐sided disease has slow flow of blood through chambers with propensity of thrombus formation especially in the right atria. Although two‐dimensional transthoracic echocardiography remains the cornerstone for the diagnosis of this disease, the case presented here shows how three‐dimensional transthoracic echocardiography can add substantial information regarding the region of involvement of the right ventricle as well as the various characteristics of the right atrial thrombus. 相似文献
42.
At our institution, kidney biopsies are performed by an interventional nephrologist with standardized guidelines using real‐time ultrasound. We hypothesized that patient factors could predict post biopsy complications. We did a retrospective review of 100 patients who underwent renal biopsy. Prebiopsy data obtained included demographics, blood pressure, laboratory studies, and kidney size. Biopsy procedure information was also recorded. Complications and post biopsy imaging was noted. A minor complication was defined as one not requiring intervention while a major complication required interventions like readmission or blood transfusion. The average age was 47 years, 41 were men, 51 were black, 30 had diabetes, 42 were obese, and 81 had hypertension. Twenty‐six patients had a complication; 14 minor and 12 major including 1 nephrectomy. Factors predictive of a complication were thrombocytopenia (p = 0.002) and inpatient status (p = 0.04). Drop in hemoglobin at 6 hours was moderately sensitive and specific for a bleeding complication with an ROC of 0.723. Thrombocytopenia and inpatient status are risk factors for complications after renal biopsy. Serum creatinine, obesity, blood pressure, kidney size, needle size, and number of passes were not predictive of a major complication in our study. 相似文献
43.
44.
Rajiv Bharat Kharwar M.D. Varun Shankar Narain M.D. D.M. Rishi Sethi M.D. D.M. F.A.C.C. 《Echocardiography (Mount Kisco, N.Y.)》2013,30(10):E331-E335
Aneurysms arising from the sinus of Valsalva are a rare cardiac defect that can present with various signs and symptoms, and if not diagnosed and treated rapidly can lead to fatal outcomes. Unruptured aneurysms are usually asymptomatic and found incidentally during diagnostic studies. More commonly, aneurysm of sinus of Valsalva is detected after the occurrence of rupture. Echocardiography has become the investigative tool of choice for this condition, not only for diagnosis but also for quantification of severity. We hereby report a rare case of a 15‐year‐old patient presenting with complaints of effort dyspnea and palpitations. Two‐dimensional transthoracic echocardiography (TTE) showed aneurysmal dilatation of left sinus of Valsalva which had ruptured into the left ventricle. Also, there was an intimal flap within the sinus of Valsalva aneurysm. The anatomical relationship between the aorta, aneurysm, and the left ventricle as well as the intimal flap within the aneurysm was clearly delineated with the help of three‐dimensional TTE. After confirmation of the diagnosis with multidetector computed tomography, patient underwent successful surgical repair of the defect. 相似文献
45.
Ahmed M. Shafter M.D. Ashish Mukherjee M.D. Prabhdeep Sethi M.D. Ramdas G. Pai M.D. 《Echocardiography (Mount Kisco, N.Y.)》2016,33(5):799-801
Isolated congenital left ventricular diverticulum (LV) is reportedly a rare finding. It is frequently associated with other congenital defects involving heart, pericardium, sternum, diaphragm, and abdominal wall. It is an outpouching from the ventricle and has all three layers of left ventricular free walls. We present the case of a 53‐year‐old woman who was discovered to have an outpouching of the LV apex on a nongated chest CT scan raising possibility of a pseudoaneurysm. A transesophageal echocardiogram (TEE) showed systolic diminution of this outpouching with unique Doppler flow‐patterns suggesting a diagnosis of a muscular type of LV diverticulum instead of a postinfarct LV pseudoaneurysm. The patient was reassured and treated conservatively. 相似文献
46.
André Jastrzebski Alex Villafranca Subash Sethi Lorne Bellan 《Journal canadien d'anesthésie》2016,63(7):842-850
47.
Rajiv Bharat Kharwar M.D. Rishi Sethi M.D. D.M. F.A.C.C. Ritesh Sanguri M.D. D.M. Vikas Singh M.D. D.M. Varun Shankar Narain M.D. D.M. 《Echocardiography (Mount Kisco, N.Y.)》2014,31(2):E44-E47
Submitral left ventricular aneurysms are a rare nonischemic aneurysm thought to be developmental in origin. These aneurysms invariably occur at the site of posterior mitral annulus and lead to mitral valve incompetence. We hereby describe a case of a 30‐year‐old adult with a rare form of submitral left ventricular aneurysm involving whole of the posterior mitral annulus. Multimodality imaging with two‐dimensional echocardiography, three‐dimensional echocardiography, computed tomography and invasive left ventriculography helped the patient to undergo successful resection of the aneurysm along with mitral valve replacement. 相似文献
48.
49.
H Khalili A Soudbakhsh M Hajiabdolbaghi S Dashti-Khavidaki A Poorzare AA Saeedi R Sharififar 《BMC infectious diseases》2008,8(1):165
Background
Human immunodeficiency virus infected individuals are prone to malnutrition due to increased energy requirements, enteropathy and increased catabolism. Trace elements such as zinc and selenium have major role in maintaining a healthy immune system. This study was designed to evaluate the nutritional status of Iranian subjects who were newly diagnosed with human immunodeficiency virus infection and to compare serum level of zinc and selenium in these patients with those of the sex and aged match healthy subjects. 相似文献50.
Upendra Kaul Ripen K Gupta Kottaram K Haridas Saligrama S Ramesh Kamal K Sethi Balbir Singh Rajiv Agarwal Ram D Yadave Tapan Ghose Rakesh R Sapra Rajiv Bajaj Madhukar Shahi Ajit Bhagwat Pramod Kumar Omen P Mathews Pratik K Soni 《Catheterization and cardiovascular interventions》2002,57(4):497-503
The results of primary coronary stenting for acute myocardial infarction (AMI) have been reported to improve significantly with the concomitant administration of platelet glycoprotein IIb/IIIa inhibitor abciximab. There are, however, no data available with the use of eptifibatide, a more cost-effective, small-molecule GP IIb/IIIa blocker with a shorter half-life. In a prospective multicenter feasibility and efficacy study, we assigned 55 consecutive patients with AMI being taken up for primary stenting to receive eptifibatide just before the procedure (two boluses of 180 microg/kg 10 min apart and a 24-hr infusion of 2 microg/kg/min). Clinical outcomes were evaluated at 30 days after the procedure. The angiographic patency of the vessel with TIMI flow rates, TIMI myocardial perfusion (TMP) grade, and corrected TIMI frame counts were assessed at the end of procedure and before hospital discharge. At 30 days, the primary endpoint, a composite of death, myocardial infarction, and urgent target vessel revascularization (TVR) was seen in 12.7% of patients. The TIMI 3 and TMP grade 3 flow, which was seen in 93% and 86% of patient, respectively, at the end of the procedure, declined to 86% and 78%, respectively (P < 0.05) before hospital discharge. Corrected TIMI frame counts also decreased from 25.7 +/- 7.2 to 22.9 +/- 6.8 (P < 0.05). There were five (9.1%) instances of subacute thrombosis (SAT) presenting as AMI, needing urgent TVR in all, within 3-5 days of the primary procedure. No excessive bleeding complication, directly attributable to the use of eptifibatide, was observed. The study was terminated prematurely because of an unacceptable SAT rate. Administration of eptifibatide along with primary stenting for AMI is associated with a high TIMI 3 and TMP grade 3 flow acutely. However, these flows decline significantly before hospital discharge and lead to a high rate of SAT. The dosage and duration of infusion of eptifibatide in this setting needs further evaluation. 相似文献