全文获取类型
收费全文 | 9180篇 |
免费 | 739篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 88篇 |
儿科学 | 409篇 |
妇产科学 | 216篇 |
基础医学 | 1210篇 |
口腔科学 | 232篇 |
临床医学 | 1281篇 |
内科学 | 1603篇 |
皮肤病学 | 115篇 |
神经病学 | 903篇 |
特种医学 | 193篇 |
外国民族医学 | 3篇 |
外科学 | 931篇 |
综合类 | 124篇 |
一般理论 | 19篇 |
预防医学 | 1328篇 |
眼科学 | 99篇 |
药学 | 590篇 |
中国医学 | 18篇 |
肿瘤学 | 576篇 |
出版年
2023年 | 91篇 |
2022年 | 134篇 |
2021年 | 313篇 |
2020年 | 180篇 |
2019年 | 282篇 |
2018年 | 266篇 |
2017年 | 215篇 |
2016年 | 207篇 |
2015年 | 237篇 |
2014年 | 343篇 |
2013年 | 450篇 |
2012年 | 643篇 |
2011年 | 660篇 |
2010年 | 295篇 |
2009年 | 291篇 |
2008年 | 482篇 |
2007年 | 529篇 |
2006年 | 504篇 |
2005年 | 500篇 |
2004年 | 424篇 |
2003年 | 377篇 |
2002年 | 310篇 |
2001年 | 153篇 |
2000年 | 154篇 |
1999年 | 120篇 |
1998年 | 73篇 |
1997年 | 54篇 |
1996年 | 38篇 |
1995年 | 51篇 |
1992年 | 90篇 |
1991年 | 98篇 |
1990年 | 85篇 |
1989年 | 80篇 |
1988年 | 66篇 |
1987年 | 77篇 |
1986年 | 69篇 |
1985年 | 61篇 |
1984年 | 51篇 |
1983年 | 44篇 |
1982年 | 36篇 |
1981年 | 37篇 |
1980年 | 44篇 |
1979年 | 57篇 |
1978年 | 45篇 |
1977年 | 52篇 |
1975年 | 38篇 |
1974年 | 41篇 |
1973年 | 32篇 |
1972年 | 47篇 |
1970年 | 40篇 |
排序方式: 共有9938条查询结果,搜索用时 0 毫秒
101.
Clark J Li W Smith G Shannon K Clifford A McNeil E Gao K Jackson M Mo Tin M O'Brien C 《Head & neck》2005,27(2):87-94
BACKGROUND: Patients with advanced cervical metastases from mucosal squamous cell carcinoma have a poor prognosis because of their high risk of regional and distal failure. This study aims to evaluate the outcomes of patients with clinical N2 or N3 disease managed with surgery and postoperative radiotherapy. METHODS: From a comprehensive computerized database, 181 entered patients who had neck dissection for N2 or N3 disease between 1988 and 1999 were evaluated. The mean age was 62 years, and minimum follow-up was 3 years. RESULTS: A total of 233 neck dissections were performed in 181 patients, including 163 comprehensive and 70 selective dissections. Postoperative radiotherapy was given in 82% of cases. The local control rate was 75% at 5 years, and control of disease in the treated neck was achieved in 86%. Macroscopic extracapsular spread (ECS) significantly increased regional recurrence (p = .001). Adjuvant radiotherapy significantly improved neck control (p = .004) but did not alter survival. Patients with ECS (both microscopic and macroscopic) who received radiotherapy had a significantly better survival than did patients with ECS who did not receive radiotherapy. Disease-specific survival for the entire group was 39% at 5 years. By use of multivariate analysis, macroscopic ECS and N2c neck disease were independent adverse prognostic factors for survival (p = .001). CONCLUSIONS: Despite a high rate of control in the treated neck, the poor survival (39%) in this patient group indicates that adjuvant therapeutic strategies need to be considered. 相似文献
102.
Marcella J. Lanzinger Steven E. Hill Laura E. Niklason Michael Shannon 《Journal canadien d'anesthésie》2005,52(4):369-373
PURPOSE: To describe the successful treatment of acute, life-threatening anemia with the oxygen therapeutic agent, hemoglobin (Hb) raffimer. CLINICAL FEATURES: A 53-yr-old female Jehovah's Witness developed severe anemia following total hip replacement. Due to prior patient directive, red blood cells were not transfused. Tachycardia, hypotension, electrocardiographic abnormalities and mental status changes developed with a nadir Hb concentration of 3.2 g x dL(-1). Hb raffimer is a purified, cross-linked, human Hb solution developed as a substitute for red blood cell Hb. After obtaining informed consent as well as Food and Drug Administration and Institutional Review Board approval for compassionate use, 2 L of Hb raffimer (Hemolink, Hemosol, Inc., Toronto, ON, Canada) were administered along with ferrous sulfate and epoetin alfa therapy. The patient's Hb level rose to 5.5 g x dL(-1) with resolution of symptoms. To allow recovery of red blood cell mass while maintaining Hb level > 4.5 g x dL(-1), additional 1000 mL doses of Hb raffimer were administered on postoperative days three, five and seven (total dose = 500 g Hb). The patient developed no serious adverse events related to treatment with Hb raffimer. By postoperative day 14, the patient's Hb level increased to 6.5 g x dL(-1) with a hematocrit of 23%. The patient was discharged. CONCLUSIONS: Use of Hb raffimer as a bridge to recovery of this patient's red blood cell mass may have prevented adverse clinical outcome. Because this product is a purified Hb solution devoid of other cellular components, it may be accepted as therapy by patients who, due to religious conviction, refuse allogeneic red blood cell transfusion. 相似文献
103.
Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation 总被引:37,自引:0,他引:37
CONTEXT: Patients who have atrial fibrillation (AF) have an increased risk of stroke, but their absolute rate of stroke depends on age and comorbid conditions. OBJECTIVE: To assess the predictive value of classification schemes that estimate stroke risk in patients with AF. DESIGN, SETTING, AND PATIENTS: Two existing classification schemes were combined into a new stroke-risk scheme, the CHADS( 2) index, and all 3 classification schemes were validated. The CHADS( 2) was formed by assigning 1 point each for the presence of congestive heart failure, hypertension, age 75 years or older, and diabetes mellitus and by assigning 2 points for history of stroke or transient ischemic attack. Data from peer review organizations representing 7 states were used to assemble a National Registry of AF (NRAF) consisting of 1733 Medicare beneficiaries aged 65 to 95 years who had nonrheumatic AF and were not prescribed warfarin at hospital discharge. MAIN OUTCOME MEASURE: Hospitalization for ischemic stroke, determined by Medicare claims data. RESULTS: During 2121 patient-years of follow-up, 94 patients were readmitted to the hospital for ischemic stroke (stroke rate, 4.4 per 100 patient-years). As indicated by a c statistic greater than 0.5, the 2 existing classification schemes predicted stroke better than chance: c of 0.68 (95% confidence interval [CI], 0.65-0.71) for the scheme developed by the Atrial Fibrillation Investigators (AFI) and c of 0.74 (95% CI, 0.71-0.76) for the Stroke Prevention in Atrial Fibrillation (SPAF) III scheme. However, with a c statistic of 0.82 (95% CI, 0.80-0.84), the CHADS( 2) index was the most accurate predictor of stroke. The stroke rate per 100 patient-years without antithrombotic therapy increased by a factor of 1.5 (95% CI, 1.3-1.7) for each 1-point increase in the CHADS( 2) score: 1.9 (95% CI, 1.2-3.0) for a score of 0; 2.8 (95% CI, 2.0-3.8) for 1; 4.0 (95% CI, 3.1-5.1) for 2; 5.9 (95% CI, 4.6-7.3) for 3; 8.5 (95% CI, 6.3-11.1) for 4; 12.5 (95% CI, 8.2-17.5) for 5; and 18.2 (95% CI, 10.5-27.4) for 6. CONCLUSION: The 2 existing classification schemes and especially a new stroke risk index, CHADS( 2), can quantify risk of stroke for patients who have AF and may aid in selection of antithrombotic therapy. 相似文献
104.
Fletcher FR Shannon C Dunbar TE;Aboriginal Torres Strait Islander Health Research Advisory Committee 《The Medical journal of Australia》2008,188(9):525-526
What impact has the NHMRC Road Map had on Aboriginal and Torres Strait Islander health? A review process now underway aims to find out. 相似文献
105.
Phoneme and speech recognition were measured as a function of stimulation pulse rate in 12 listeners with three types of cochlear implants. Identification of consonants and vowels and recognition of words and sentences were measured in 5 Clarion C1 subjects fit with continuous interleaved sampling (CIS) processors having 4 or 8 electrodes, 4 Nucleus 24 subjects fit with CIS processors having 4, 8, 12 or 16 electrodes and 3 Clarion C2 subjects fit with CIS processors with 4, 8, 12 and 16 electrodes. Stimulation rates ranged from 200 to more than 5000 Hz per electrode, depending on the device, number of electrodes used and stimulation strategy. Listeners were also tested on the same materials with their original processor prior to receiving the experimental processors. All testing was done in quiet listening conditions with essentially no practice with the experimental processor prior to data collection. Listeners scored the highest with their original processor. Little difference in speech understanding was observed for listener scores with processors using different stimulation rates. Speech recognition was significantly poorer only at the lowest stimulation rate and at high rates that used noninterleaved pulses. Speech recognition was similar for processors using 8, 12 or 16 electrodes. Only 4-electrode processors produced a significantly poorer performance. These results suggest that patients with present commercial implants are not able to make full use of the number of channels of spectral information delivered by the present speech processors. In addition, the results show no significant change in performance as a function of stimulation rate, suggesting that high stimulation rates do not result in improved access to temporal cues in speech, at least under quiet listening conditions. 相似文献
106.
Meghan T. Hession M.D. Shannon M. Campbell D.O. Sophie J. Balk M.D. Deborah L. Cummins M.D. 《Pediatric dermatology》2013,30(5):626-627
This report presents results from an online survey of New York State pediatricians regarding their counseling habits and attitudes toward indoor tanning among adolescents, as well as their awareness of current legislation that restricts youth access to tanning beds. 相似文献
107.
Two cases of compartment syndromes after tibial fractures are presented in patients who had no sensation in the involved compartments. The absence of any clinical symptoms in these patients emphasizes the need for routine monitoring of intra-compartmental pressure in this select group of patients. 相似文献
108.
Robinson SK McQuaid JR Viirre ES Betzig LL Miller DL Bailey KA Harris JP Perry W 《The international tinnitus journal》2003,9(2):97-103
Twenty percent of people endure tinnitus to a degree that their quality of well-being and productivity in life are impaired, and up to 60% report depression. Four measures are widely used to assess tinnitus-related distress, yet the relationship among all four measures or their relationship to relevant psychiatric variables has yet to be studied. This study assessed the association between the four commonly used measures of tinnitus and their relationship to depressive symptoms, quality of well-being, and internal focus. Sixty-five people with tinnitus completed the following measures: Iowa Tinnitus Handicap Questionnaire (THQ); Tinnitus Reaction Questionnaire (TRQ); Tinnitus Handicap Inventory (THI); Tinnitus Questionnaire (TQ); Hamilton Rating Scale for Depression (HRSD); Beck Depression Inventory (BDI); Quality of Well-Being Scale (QWBS); Modified Somatic Perception Questionnaire (MSPQ); and Private Self-Consciousness Scale (PSCS). All the tinnitus measures were highly intercorrelated (r = .76-.90; all p values < .001), and related to depressive symptoms (r = .48-.66; p < .001) and QWBS (r = .37-.48; all p values < 0.008). The tinnitus measures correlated with the MSPQ (r = .37-.52; all p values < .01) but not with the PSCS. When controlling for the shared variance between tinnitus measures, the THQ independently predicted the HRSD, whereas the TRQ independently predicted the BDI. 相似文献
109.
TANG Yuan-zhang Moore-Langston Shannon LAI Guang-hui LI Xuan-ying LI N NI Jia-xiang 《中华医学杂志(英文版)》2013,126(24):4691-4695
Background Visceral pain is a common cause for seeking medical attention. Afferent fibers innervating viscera project to the central nervous system via sympathetic nerves. The lumbar sympathetic nerve trunk lies in front of the lumbar spine. Thus, it is possible for patients to suffer visceral pain originating from sympathetic nerve irritation induced by anterior herniation of the lumbar disc. This study aimed to evaluate lumbar discogenic visceral pain and its treatment. Methods Twelve consecutive patients with a median age of 56.4 years were enrolled for investigation between June 2012 and December 2012. These patients suffered from long-term abdominal pain unresponsive to current treatment options. Apart from obvious anterior herniation of the lumbar discs and high signal intensity anterior to the herniated disc on magnetic resonance imaging, no significant pathology was noted on gastroscopy, vascular ultrasound, or abdominal computed tomography (CT). To prove that their visceral pain originated from the anteriorly protruding disc, we evaluated whether pain was relieved by sympathetic block at the level of the anteriorly protruding disc. If the block was effective, CT-guided continuous lumbar sympathetic nerve block was finally performed. Results All patients were positive for pain relief by sympathetic block. Furthermore, the average Visual Analog Scale of visceral pain significantly improved after treatment in all patients (P 〈0.05). Up to 11/12 patients had satisfactory pain relief at 1 week after discharge, 8/12 at 4 weeks, 7/12 at 8 weeks, 6/12 at 12 weeks, and 5/12 at 24 weeks. Conclusions It is important to consider the possibility of discogenic visceral pain secondary to anterior herniation of the lumbar disc when forming a differential diagnosis for seemingly idiopathic abdominal pain. Continuous lumbar sympathetic nerve block is an effective and safe therapy for patients with discogenic visceral pain. 相似文献
110.