全文获取类型
收费全文 | 1097篇 |
免费 | 55篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 48篇 |
妇产科学 | 13篇 |
基础医学 | 156篇 |
口腔科学 | 60篇 |
临床医学 | 85篇 |
内科学 | 206篇 |
皮肤病学 | 5篇 |
神经病学 | 133篇 |
特种医学 | 44篇 |
外科学 | 166篇 |
综合类 | 3篇 |
预防医学 | 85篇 |
眼科学 | 10篇 |
药学 | 72篇 |
肿瘤学 | 60篇 |
出版年
2021年 | 4篇 |
2020年 | 12篇 |
2019年 | 16篇 |
2018年 | 10篇 |
2017年 | 17篇 |
2016年 | 15篇 |
2015年 | 13篇 |
2014年 | 27篇 |
2013年 | 54篇 |
2012年 | 62篇 |
2011年 | 41篇 |
2010年 | 35篇 |
2009年 | 44篇 |
2008年 | 75篇 |
2007年 | 76篇 |
2006年 | 79篇 |
2005年 | 79篇 |
2004年 | 77篇 |
2003年 | 72篇 |
2002年 | 72篇 |
2001年 | 18篇 |
2000年 | 5篇 |
1999年 | 16篇 |
1998年 | 21篇 |
1997年 | 14篇 |
1996年 | 13篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 16篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 12篇 |
1989年 | 6篇 |
1988年 | 5篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 10篇 |
1983年 | 8篇 |
1982年 | 8篇 |
1981年 | 12篇 |
1980年 | 4篇 |
1979年 | 8篇 |
1978年 | 8篇 |
1976年 | 7篇 |
1973年 | 4篇 |
1972年 | 3篇 |
1971年 | 4篇 |
1967年 | 3篇 |
1965年 | 3篇 |
排序方式: 共有1158条查询结果,搜索用时 0 毫秒
61.
Tension-free vaginal tape and laparoscopic mesh colposuspension for stress urinary incontinence 总被引:8,自引:0,他引:8
Valpas A Kivelä A Penttinen J Kujansuu E Haarala M Nilsson CG 《Obstetrics and gynecology》2004,104(1):42-49
OBJECTIVE: To compare objective and subjective outcomes after the tension-free vaginal tape procedure (TVT) with laparoscopic mesh colposuspension as a primary treatment for female stress urinary incontinence. Objective outcome measures were stress test and 48-hour pad test. METHODS: In 6 departments of gynecology in Finland, including 4 university teaching hospitals and 2 central hospitals, 128 women with urodynamic stress incontinence were randomly allocated to 2 treatment groups. Seventy were treated with TVT and 51 by means of laparoscopic mesh colposuspension. There were 7 dropouts. Inclusion criteria were history of stress incontinence, positive stress test, and urodynamic conformation of stress incontinence. Exclusion criteria were age older than 70 years, previous incontinence surgery, more than 3 episodes of urinary tract infection within the last 2 years, coincident other gynecological surgery, body mass index more than 32 kg/m(2), urethral closure pressure less than 20 cm H(2)O, and residual volume more than 100 mL in preoperative urodynamic evaluation. Assessment took place before treatment and at 12 months postoperatively with the cough stress test, Urge Score, 48-hour pad test, King's College Health Questionnaire, Visual Analog Scale, and Urinary Incontinence Severity Score. RESULTS: When negative stress test was used as criteria for cure, 85.7% of women in the TVT group and 56.9% in the laparoscopic mesh colposuspension group were objectively cured. Subject satisfaction was significantly better after the TVT procedure than after laparoscopic mesh colposuspension. CONCLUSION: Treatment with TVT results in higher objective and subjective cure rates at 1 year than treatment by means of laparoscopic mesh colposuspension. 相似文献
62.
Palmu R Isometsä E Suominen K Vuola J Leppävuori A Lönnqvist J 《Burns : journal of the International Society for Burn Injuries》2004,30(5):443-447
The aim of this study was to investigate differences in characteristics of burn patients who had attempted suicide, as compared with other burn patients admitted to the Helsinki Burn Centre during 1989-97. Burn patients were first drawn from a computerised register, after which a psychiatrist examined their medical records and ascertained the suicide attempters. Of the total of 811 burn patients, 46 (5.7%) had attempted suicide. The median total body surface area (TBSA) of suicide attempters (24.0%) was markedly higher than in the other patients (6.0%, P < 0.001). Flame was a much more common cause of burns among suicide attempters (82.1%) than among the remainder (44.5%, P < 0.001). Suicide attempters were also more often unemployed (28.2 versus 12.9%) or on disability pension (30.8 versus 7.1%) before the injury (P < 0.001). Although the proportion with self-inflicted burns among all burn patients was not high, the markedly higher severity of their burns makes them an important clinical subgroup for further study. 相似文献
63.
Coronary artery bypass grafting (CABG) for unstable angina pectoris patients results in a higher incidence of arrhythmia and higher arrhythmic cardiac mortality. Ischemic preconditioning (IP) has proved effective in suppressing ischemia reperfusion arrhythmias in animals and in humans. The purpose of the present study was to investigate whether IP protects against postoperative arrhythmias in recent unstable angina patients undergoing urgent CABG. Forty-one patients with recent unstable angina and three-vessel coronary artery disease admitted for CABG were randomized into an IP group and a control group. The IP protocol involved twice occluding the ascending aorta with a cross-clamp for 2 minutes, followed by 3 minutes of reperfusion. Twenty-four-hour continuous electrocardiography (24-h ECG) was recorded from the preoperative day to the 2nd postoperative day. The incidences of supraventricular extrasystole (SVES), ventricular extrasystole (VES), supraventricular tachycardia (SVT), and ventricular tachycardia (VT) were 95.2%, 85.7%, 26.2%, and 26.2%, respectively, before surgery and 100.0%, 100.0%, 88.1%, and 76.2%, respectively, after surgery. IP significantly reduced the incidence of VT and the severity of SVES, VES, SVT, and VT after surgery. The period of mechanical ventilation and the length of stay in the intensive care unit were significantly shorter in the IP group. In summary, rhythm disturbances are common in CABG patients with recent unstable angina. IP significantly reduces rhythm disturbances, including SVES, VES, SVT, and VT after CABG. The findings indicate that IP could constitute an additional myocardial protective strategy in recently unstable angina patients undergoing CABG. 相似文献
64.
Partonen T Haukka J Viilo K Hakko H Pirkola S Isometsä E Lönnqvist J Särkioja T Väisänen E Räsänen P 《Journal of affective disorders》2004,78(1):11-19
BACKGROUND: Time patterns of suicide have been attributed not only to social and psychological factors but also to direct geophysical effects. Seasonal variations in day length and temperature seem likely to contribute to the timing of the suicide process. METHODS: We analysed all suicides (n=1658) committed in a northern province of Finland during a period of 153 months. Daily data on the number of suicides, local weather conditions and geomagnetic storms were compiled and modelled with Poisson regression using the province population as the denominator, and with the means of harmonic series for seasonal variation. Time series analysis of monthly numbers of suicides was carried out using the seasonal-trend decomposition procedure based on loess. RESULTS: Marked fluctuations in the number of suicides occurred during the study period (P=0.01). There was significant seasonal variation in death from suicide (P=0.01), but analysis of the meteorological data showed no evidence of effect on the risk of suicide. LIMITATIONS: Assessment of mental disorder or alcohol consumption was missing, since only data derived from death certificate was available for each case. CONCLUSIONS: The seasonal effect was significant, but remained modest compared to sex and age as risk factors for suicide. Preventive measures need to be tailored according to time of the year. 相似文献
65.
BACKGROUND: The aim of the study was to examine the effects of parental socioeconomic status, own socioeconomic status and social mobility upon the development of smoking from adolescence to adulthood. METHODS: Subjects were the participants of the North Karelia Youth Project study from six schools in Eastern Finland. At the baseline in 1978 they were 13 year-olds (n=903) and in the last of the six surveys in 1993 they were 28-year-olds. The parents were studied in 1978 and 1980. The association between smoking and socioeconomic status was measured by education, occupation and income in adolescence and adulthood, and social mobility was measured by the difference between parental and own education. RESULTS: In general, parental socioeconomic status was not significantly associated with the subjects' smoking in adolescence or adulthood. Own socioeconomic status measured at the age of 21 and 28 was strongly related to smoking. Those who were most educated in adulthood had smoked the least already from the age of 13. Social mobility was not significantly associated with smoking. CONCLUSION: The study stresses the importance of own socioeconomic status in relation to smoking, but parental socioeconomic status or social mobility does not have direct effects on smoking. Socioeconomic differences in smoking should be understood as an important determinant for health inequalities. 相似文献
66.
Leskelä US Melartin TK Lestelä-Mielonen PS Rytsälä HJ Sokero TP Heikkinen ME Isometsä ET 《The Journal of nervous and mental disease》2004,192(5):373-381
We investigated differences in life events and social support between subgroups of depressed patients and the distribution of life events in phases preceding or during depression. In the Vantaa Depression Study, 269 psychiatric patients with DSM-IV major depressive disorder were diagnosed with Schedule for Clinical Assessment in Neuropsychiatry, Version 2.0, and Structured Clinical Interview for DSM-III-R personality disorders (SCID-II). Life events during the 12 months preceding the interview were investigated with the Interview for Recent Life Events, and social support with the Interview Measure of Social Relationships and the Perceived Social Support Scale-Revised. Nearly all patients (91%) reported life events, on average 4.1 per preceding year. No major differences between sociodemographic or clinical subgroups were found; the frequency of events was somewhat greater among the younger subjects, whereas those with comorbid alcoholism or personality disorders perceived less social support. Although events were distributed evenly between the time preceding depression, the prodromal phase, and the index major depressive episode, two thirds of the patients attributed their depression to some event. Despite clinical and sociodemographic heterogeneity, patients with major depressive disorder are fairly homogeneous in terms of life events during the preceding year. Events do not cluster in any particular phase of the progression to an episode. 相似文献
67.
The association of alcohol dependence with suicidal behaviour is well established although complex. On the basis of epidemiological and clinical evidence, alcohol dependence is known to increase the risk for suicidal ideation, suicide attempts and completed suicide. However, this risk is modulated by a wide variety of factors including sociodemographic, clinical, treatment-related and life situational characteristics as well as current drinking status and the effect of inebriation. Treatment and management of patients with alcohol dependence and concomitant suicidal communication or suicide attempts is crucial, as is the recognition of these patients in emergency and other healthcare service contacts. The treatment strategies cannot be based on evidence derived from randomised clinical trials as such data do not exist. They must rather be based on current knowledge of risk factors for suicidal behaviour, efficacy of treatment for alcohol dependence or relevant co-morbid conditions and problems known to be common in treatment settings. In this article, we review the essential literature on the epidemiological and clinical research in the areas of alcohol dependence and suicidal behaviour. On the basis of current data and clinical experience, we suggest the following principles be followed in the management of alcohol-dependent individuals: (i) suicidal threats or communication by alcohol-dependent individuals in emergency and other contacts should be taken seriously; (ii) other mental disorders should be well evaluated, a consequent treatment plan initiated and follow-up arranged; (iii) appropriate and up-to-date pharmacological treatment should focus on both reducing the amount of drinking and treating symptoms of other mental disorders; (iv) psychotherapeutic efforts should be focused on emerging symptoms of both alcohol use and other mental disorders; and (v) known epidemiological and clinical risk factors, adverse life events in particular, should be recognised and taken into account. 相似文献
68.
Cytokines and adhesion molecules in duodenal mucosa of children with delayed-type food allergy 总被引:1,自引:0,他引:1
Veres G Westerholm-Ormio M Kokkonen J Arato A Savilahti E 《Journal of pediatric gastroenterology and nutrition》2003,37(1):27-34
OBJECTIVES: The aim was to investigate the expression of cytokines, adhesion molecules, and activation and proliferation markers in duodenal biopsies from children with delayed-type food allergy (FA). METHODS: Seven children with untreated FA (uFA), seven children with treated FA (tFA) to cow milk and/or cereals, and five normal controls furnished duodenal biopsy specimens. Additionally, five pediatric patients with celiac disease were included, serving exclusively as positive controls for in situ hybridization. Interferon-gamma (IFN-gamma), interleukin-4 (IL-4), adhesion molecules, and activation markers were detected by immunohistochemistry, and expression of IFN-gamma and IL-4 messenger RNA was revealed by in situ hybridization. RESULTS: uFA patients had a higher density of IFN-gamma positive cells in the lamina propria than did tFA patients and controls (P = 0.053 and P = 0.018). Moreover, the uFA patients exhibited a higher proportion of crypt cells in mitosis than did tFA patients (P = 0.026), and stronger staining of HLA-DR in the crypts and increased density of gammadelta-T cell receptor-positive intraepithelial lymphocytes than did controls (P = 0.048 and P = 0.010). The densities of alpha(4)beta(7) positive cells in the lamina propria tended to be higher in controls than in uFA or tFA patients (P = 0.106, P = 0.073). Expression of IL-4 mRNA was significantly higher in celiac patients than in the other study groups (uFA P = 0.006, tFA P = 0.010; controls P = 0.029), and celiac patients showed higher expression of IFN-gamma mRNA than did tFA patients or controls (P = 0.017 and P = 0.016). CONCLUSIONS: As expected, Th1 dominance was present in the lamina propria of children with delayed-type FA. It may cause activation of epithelial cells and increase their turnover. 相似文献
69.
The effects of transdermal estrogen therapy on bone mass and turnover in early postmenopausal smokers: a prospective, controlled study 总被引:2,自引:0,他引:2
Välimäki MJ Laitinen KA Tähtelä RK Hirvonen EJ Risteli JP 《American journal of obstetrics and gynecology》2003,189(5):1213-1220
OBJECTIVE: The purpose of this study was to investigate whether smoking reduces the effects of transdermal estrogen replacement therapy on bone. STUDY DESIGN: One hundred forty-eight women (0.5-5 years after menopause, aged 46-58 years) completed the study. Smokers were assigned randomly to receive either 1.0 mg (n=32 women) or 1.5 mg (n=31 women) of transdermal estradiol in gel daily, and nonsmokers (n=46 women) were assigned to receive 1.0 mg of transdermal estradiol for 2 years. The control group consisted of 17 smokers and 22 nonsmokers. Bone mineral density was measured by dual-energy x-ray absorptiometry. Bone turnover was assessed by measurements of urinary aminoterminal telopeptide of type I collagen and serum aminoterminal propeptide of type I procollagen. RESULTS: Lumbar spine bone mineral density increased similarly in smoking (+3.6%) and nonsmoking (+2.6%) estrogen users (P<.0001 to a decrease of 2.5% in the control group). Femoral neck bone mineral density increased 2.2% to 2.4% in smoking and nonsmoking estrogen users but decreased 0.2% in control subjects (P<.05). Urinary aminoterminal telopeptide of type I collagen decreased similarly in all estrogen-using groups (P<.05 to control group), but serum aminoterminal propeptide of type I procollagen decreased more in smoking than in nonsmoking estrogen users (P=.006). Serum 25-hydroxyvitamin D was 20% lower (P=.004) in smokers than in nonsmokers. CONCLUSION: Transdermal estrogen treatment protects smoking women as effectively as nonsmokers from osteoporosis. Smoking worsens the vitamin D state of postmenopausal women. 相似文献
70.
BACKGROUND: Idiopathic inflammatory medial meatal fibrotizing otitis (IMFO) is rare. Only a few cases with unknown cause have been reported. OBJECTIVE: To report 3 cases of IMFO as a specific diagnostic entity. PATIENTS AND METHODS: Two adults and 1 child with bilateral IMFO were observed for several years at the Department of Otorhinolaryngology of Helsinki University Hospital, Helsinki, Finland. RESULTS: Only the osseous part of the external ear canals was affected by IMFO. The skin and skin organs over the lateral cartilage of the ear canals remained rigorously and constantly uninflamed through the active, relentless progression of the disease over several years, resulting in the formation of a fibrous plug of the medial meatal canal. The middle ears and mastoid air cells were not affected during the active inflammatory phase. CONCLUSION: IMFO has its own specific pathophysiologic characteristics, and perhaps also etiopathologic characteristics, which are still unknown. 相似文献