全文获取类型
收费全文 | 2373篇 |
免费 | 100篇 |
国内免费 | 30篇 |
学科分类
医药卫生 | 2503篇 |
出版年
2015年 | 25篇 |
2013年 | 76篇 |
2012年 | 27篇 |
2010年 | 44篇 |
2009年 | 35篇 |
2008年 | 31篇 |
2007年 | 49篇 |
2006年 | 57篇 |
2005年 | 34篇 |
2004年 | 26篇 |
2003年 | 31篇 |
2002年 | 30篇 |
2001年 | 33篇 |
2000年 | 26篇 |
1999年 | 37篇 |
1998年 | 83篇 |
1997年 | 95篇 |
1996年 | 104篇 |
1995年 | 71篇 |
1994年 | 74篇 |
1993年 | 77篇 |
1992年 | 41篇 |
1991年 | 38篇 |
1990年 | 44篇 |
1989年 | 73篇 |
1988年 | 59篇 |
1987年 | 50篇 |
1986年 | 53篇 |
1985年 | 40篇 |
1984年 | 55篇 |
1983年 | 27篇 |
1982年 | 31篇 |
1981年 | 38篇 |
1980年 | 49篇 |
1979年 | 25篇 |
1978年 | 28篇 |
1977年 | 45篇 |
1976年 | 51篇 |
1975年 | 44篇 |
1974年 | 22篇 |
1972年 | 35篇 |
1971年 | 31篇 |
1970年 | 24篇 |
1969年 | 21篇 |
1965年 | 52篇 |
1964年 | 50篇 |
1963年 | 47篇 |
1962年 | 42篇 |
1961年 | 40篇 |
1960年 | 66篇 |
排序方式: 共有2503条查询结果,搜索用时 109 毫秒
21.
22.
Hessmann M. H. Ingelfinger P. Hofmann A. Rommens P. M. 《Trauma und Berufskrankheit》2007,9(2):S172-S178
Secondary or delayed reconstructions following mal- or nonunited fractures of the pelvic ring and acetabulum are challenging procedures. Three different healing problems have to be distinguished: malunion, nonunion, and fractures and/or dislocations that have healed incompletely. Combinations of these three pathologies are also possible. Delayed reconstructions have no chance of success unless the patient’s signs and symptoms are clearly attributable to the malunion or nonunion. This means that extensive clinical and radiological evaluation is mandatory preoperatively. Risks involved and the results that can be expected must be discussed thoroughly with the patient once the surgery has been planned in detail. For the treatment of nonunion or delayed union, the unstable zone must be debrided, and autologous bone grafting with cancellous bone and stable internal fixation are then required. Malunion requires careful mobilization of the malunited fracture fragments, which is often a very demanding procedure. If there is already advanced damage to the acetabulum little functional improvement can be expected after a corrective osteotomy. Viable treatment alternatives are hip fusion and endoprosthetic joint replacement. Possible complications include damage to neurovascular structures, impaired wound healing, infections and implant failure. Extensive experience in the management of acute fractures of the pelvic ring and acetabulum is essential if delayed reconstruction is to be successful. 相似文献
23.
KLEPP K-I.; ULVIK R.J.; MATTHIESEN S.B.; HANNAN P.; JACOBS D.R. JR.; AARO L.E. 《European journal of public health》1993,3(1):38-42
The general public of the City of Bergen, Norway was Invitedto participate in a cholesterol screening programme in October1988. Participants received the results of the cholesterol screeningand nutritional information from trained health personnel. Ashort questionnaire was mailed to all 354 participants 12weeks after the initial cholesterol screening. In March 1990,all participants were invited to have their cholesterol levelsre-examined. Psychosocial factors believed to be predictiveof future serum cholesterol changes were assessed at baselinealong with demographic variables. The majority of participants(61%) reduced their cholesterol level from October 1988 to March1990, and the average reduction in cholesterol level for thetotal population was 4.0%. Baseline cholesterol levels, beingconfident of one's own ability to change one's diet (self-efficacy),seeing heart disease risk reduction as very important, and maritalstatus were factors that significantly predicted successfulcholesterol reduction 18 months later. 相似文献
24.
Postoperative radiation therapy in the management of lung cancer 总被引:1,自引:0,他引:1
Postoperative radiation therapy for lung cancer is still controversial. In a 9-year period, 69 patients with non-oat-cell carcinoma of the lung (16% stage I, 26% stage II, and 58% stage III) received such therapy. The radiation dose was less than 5,000 cGy in 42 patients, 5,000-5,900 cGy in 16, and 6,000 cGy or more in 11; follow-up ranged from 24 to 64 months. Actuarial survival at 2 and 4 years was 50% and 16%, respectively, for squamous cell carcinoma, and 40% and 26% for adenocarcinoma. The 5-year survival for stages I, II, and III cancer was 29%, 17%, and 19%, respectively. Histologic findings and type of surgery did not affect survival, but the radiation dose apparently did. The 3-year survival for patients who received less than 6,000 cGy was 35%, compared with 73% for patients who received higher doses. In eight patients, treatment failed within the irradiated volume: all had received doses of less than 6,000 cGy, and the volume in three was judged to be inadequate. 相似文献
25.
26.
Evaluation of maternal plasma creatine kinase activity as a marker of abnormal early pregnancy 总被引:1,自引:0,他引:1
Zorn JR; Cherruau B; Abi-Rached F; Dehee A; Danoy X; Le Blond J; Ekindjian O 《Human reproduction (Oxford, England)》1997,12(11):2534-2537
We have tested the value of maternal plasma creatine kinase activity for
diagnosing ectopic pregnancies obtained after in-vitro fertilization and
embryo transfer. Plasma creatine kinase was assayed in 57 patients: 20
normal, 23 miscarriages and 14 ectopic pregnancies, for a total of 240
samples. All values were in the lower part of the normal range except only
one in a miscarrying patient. A statistically significant difference was
observed for a cut-off value of 45 IU/l between normal and ectopic
pregnancies. However, for this cut-off point, the measurement of plasma
creatine kinase activity had a sensitivity of 0.50 and a specificity of
0.76 for the diagnosis of ectopic pregnancy. The positive predictive value
was 0.69. Creatine kinase activity measurements are thus of no practical
value in this particular population, in which an early and specific marker
of ectopic implantation would be of paramount interest. The association of
human chorionic gonadotrophin (HCG) determinations and ultrasound scanning
of the pelvis still remain the best paraclinical support for an early
diagnosis of ectopic implantation.
相似文献
27.
28.
29.
MARTIN J. BOHN JR JOYCE L. CARBONELL EDWIN I. MEGARGEE 《Criminal behaviour and mental health : CBMH》1995,5(1):14-33
This study investigated the applicability and utility of Megargee and Bohn's MMPI-based offender classification system in correctional mental health units (MHUs). Previous studies found that 11 MHU samples (n = 1723) had substantially more offenders classified in the more pathological MMPI types than did 21 samples (n = 5881) drawn from general male populations in US prisons. In this study of 63 severely disturbed felons, 43% belonged to the most pathological type (‘group How’). Comparing MHU patients with general offenders from the same IvfIvIPI types on staff ratings and case history variables, we found that the MHU patients were significantly poorer in adjustment. Within the MHU sample, there was no difference in case history variables or adjustment ratings between those in the most and least severe MMPI types. These findings differed from those of studies using less severely disturbed, more heterogeneous, MHU populations. It was concluded that, in settings in which the entire population is flagrantly disturbed, the MMPI-based system is more useful in screening potential admissions than it is in making meaningful distinctions among those already admitted. 相似文献
30.
ALFENTANIL PLASMA CONCENTRATION v. EFFECT RELATIONSHIPS IN CARDIAC SURGICAL PATIENTS 总被引:1,自引:0,他引:1
HUG C. C. JR; HALL R. I.; ANGERT K. C.; REEDER D. A.; MOLDENHAUER C. C. 《British journal of anaesthesia》1988,61(4):435-440
Effects of alfentanil, preceded by lorazepam, on suppressionof haemodynamic and somatic responses to noxious stimuli wasstudied in patients undergoing CABG. Plasma concentration ofalfentanil, somatic and haemodynamic responses were measuredat loss of consciousness, tracheal intubation, sternotomy andduring multiple applications of electrocoagulation. Additionalalfentanil was administered i.v. to control unwanted responses.Study 1 (six patients): lorazepam 0.08 mg kg1 by mouth12 h before operation, alfentanil priming infusion (60µg kg1 min1 for 10 min) followed by maintenanceinfusion (4.5 µg kg1 min1). With mean plasmaalfentanil 1178 (SEM 54) ng ml1, two patients requiredsupplementary alfentanil to suppress somatic motor responses;one patient required nitroglycerin to control an increase inarterial pressure which was unresponsive to additional alfentanilfollowing sternotomy. Study 2 (13 patients): lorazepam 0.04mg kg1 by mouth as premedication; one of three maintenanceinfusion rates of alfentanil: 5.4 (n=4), 6.6 (n=5), or 7.8 (n=4)µg kg1 min1, each preceded by a proportionalpriming infusion. With plasma alfentanil 2181 (62)ng ml1,somatic motor responses requiring additional alfentanil occurredin nine patients; haemodynamic responses in four of seven patientstested could not be controlled by alfentanil. The highest plasmaconcentration of alfentanil to prevent response to a stimulusother than tracheal intubation was different between the twostudies (P<0.05). We conclude that alfentanil alone is insufficientto suppress haemodynamic and somatic motor responses to noxiousstimulation during CABG and that the role of premedication issignificant.
*Department of Anesthesia, Bowman-Gray School of Medicine Winston-Salem,NC 27103, U.S.A.
2114 de Mayo Road, Del Mar, Ca. 92014, U.S.A. 相似文献