全文获取类型
收费全文 | 858篇 |
免费 | 32篇 |
国内免费 | 78篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 42篇 |
妇产科学 | 7篇 |
基础医学 | 93篇 |
口腔科学 | 15篇 |
临床医学 | 142篇 |
内科学 | 177篇 |
皮肤病学 | 22篇 |
神经病学 | 8篇 |
特种医学 | 286篇 |
外科学 | 25篇 |
综合类 | 20篇 |
预防医学 | 25篇 |
眼科学 | 1篇 |
药学 | 76篇 |
肿瘤学 | 28篇 |
出版年
2023年 | 2篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 8篇 |
2015年 | 9篇 |
2014年 | 11篇 |
2013年 | 15篇 |
2012年 | 13篇 |
2011年 | 4篇 |
2010年 | 22篇 |
2009年 | 33篇 |
2008年 | 13篇 |
2007年 | 60篇 |
2006年 | 4篇 |
2005年 | 19篇 |
2004年 | 7篇 |
2003年 | 13篇 |
2002年 | 9篇 |
2001年 | 15篇 |
2000年 | 12篇 |
1999年 | 19篇 |
1998年 | 66篇 |
1997年 | 72篇 |
1996年 | 50篇 |
1995年 | 62篇 |
1994年 | 36篇 |
1993年 | 35篇 |
1992年 | 16篇 |
1991年 | 17篇 |
1990年 | 13篇 |
1989年 | 34篇 |
1988年 | 33篇 |
1987年 | 23篇 |
1986年 | 26篇 |
1985年 | 43篇 |
1984年 | 18篇 |
1983年 | 12篇 |
1982年 | 25篇 |
1981年 | 14篇 |
1980年 | 24篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 14篇 |
1976年 | 15篇 |
1975年 | 9篇 |
1970年 | 1篇 |
排序方式: 共有968条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
Tu'meh SS; Tracy DA; Wynne J; Konstam MA; Kozlowski JF; Neumann AL; Holman BL 《Radiology》1982,145(2):463-466
The authors describe a simple technique for diagnosis of tricuspid regurgitation. Red blood cells were labeled in vivo with 99mTc and 22 patients were studied with ECG-gated blood-pool imaging of the liver. A single region of interest was manually drawn around the liver and a time-activity curve obtained. The per cent change in liver counts during the cardiac cycle was found to be significantly higher in the 12 patients with tricuspid regurgitation (Group I) (mean, 4.04 +/- 1.6%; range, 1.3-21.4%) compared with the 10 controls (Group II) (mean, 0.35 +/- 0.16%; range, 0.013-1.3%) (p less than 0.05). Using a 1% change in liver counts as the criterion of a positive study, all 12 cases in Group I were diagnosed correctly, but there was one false positive in Group II; thus the sensitivity was 100% and the specificity 90%. 相似文献
65.
Postembolic colonic infarction 总被引:12,自引:0,他引:12
66.
67.
银杏叶制剂对心绞痛患者的抗氧化和抗脂质过氧化作用 总被引:15,自引:0,他引:15
目的:探讨银杏叶制剂对心绞痛患者的抗氧化和抗脂质过氧化作用。方法:检测了78例心绞痛患者经银杏叶制剂“天宝宁”治疗前后的血浆维生素C(P-VC)、维生素E(P-VE)、β-胡萝卜素(P-β-CAR)、过氧化脂质(P-LPO)以及红细胞超氧化物歧化酶(E-SOD)、过氧化氢酶(E-CAT)、谷胱甘肽过氧化物酶(E-GSH-PX)、过氧化脂质(E-LPO)值。结果:与治疗前比较,治疗后的P-VC、P- 相似文献
68.
Mercado S; Hunter DW; Castaneda-Zuniga WR; Amplatz K; Young AT; Cardella JF; Lange PH; Hulbert JC; Reddy P 《Radiology》1986,158(1):207-209
Percutaneous nephrostolithotomy, which can require a double puncture, is presently the method of choice in our institution for the removal of renal stones. Patients that underwent this procedure were evaluated to identify the possible reasons for the double puncture. Of 200 patients evaluated, 14 needed a second tract. The three variables that determined whether a second puncture was needed, in order of importance, were number and size of the stones, with second tracts needed in patients with multiple stones and staghorn calculi; anatomical variations of the renal collecting system itself, with bifid systems the most significant anatomic variation; and the dexterity of the radiologist in performing the puncture and the ability of the urologist to extract the stone. Second tracts were needed more frequently in patients who presented with stones in both the lower and middle poles of the collecting systems. 相似文献
69.
Darcy MD; Cardella JF; Hunter DW; Smith TP; Castaneda-Zuniga WR; Lund G; Amplatz K 《Radiology》1986,161(3):611-614
The Amplatz retrievable vena caval filter was designed in an attempt to decrease complications associated with the placement of Mobin-Uddin or Kimray-Greenfield filters. The design allows percutaneous retrieval, thus expanding application of the filter to situations requiring temporary prophylaxis against pulmonary embolism. Filters have been placed in 16 patients, nine (56%) for prophylactic purposes. All filters were easily inserted percutaneously. Complications occurred in three patients; these included complete thrombosis of the inferior vena cava below the filter, misplacement of one filter into the pericaval retroperitoneal tissue, and development of thrombus cranial to the filter. With the current introduction system, the possibility of filter misplacement has been essentially eliminated. No patient experienced symptoms suggestive of pulmonary embolism after filter insertion. One filter retrieval has been performed, with no complications. 相似文献
70.
A prospective evaluation of color flow mapping and real-time ultrasound was performed to determine if pseudoaneurysms could be distinguished from other causes of masses surrounding vascular grafts of the lower extremities. Twelve palpable pulsatile masses were imaged. Diagnoses were confirmed at angiography (n = 11), computed tomography (n = 7), aspiration biopsy (n = 5), and operative intervention (n = 6). A swirling pattern of blood flow was seen in six of seven cases of pseudoaneurysm. Lack of flow signals was noted in four of the five collections representing hematoma (n = 2) or infection (n = 2). The seventh case was later shown to be an infected, thrombosed pseudoaneurysm. The single false-positive diagnosis was made early in the series when the flow signals detected were due to transmitted arterial pulsations. The authors conclude that color Doppler flow imaging is useful in the differential diagnosis of pulsatile masses associated with prosthetic grafts. Prosthetic graft pseudoaneurysms have a specific appearance of swirling blood flow arising from a wide neck and are distinguishable from traumatic or iatrogenic pseudoaneurysms of the native vascular tree. 相似文献