全文获取类型
收费全文 | 432176篇 |
免费 | 24586篇 |
国内免费 | 16622篇 |
专业分类
耳鼻咽喉 | 3889篇 |
儿科学 | 10222篇 |
妇产科学 | 6528篇 |
基础医学 | 42326篇 |
口腔科学 | 6219篇 |
临床医学 | 45264篇 |
内科学 | 65480篇 |
皮肤病学 | 3366篇 |
神经病学 | 27711篇 |
特种医学 | 18273篇 |
外国民族医学 | 101篇 |
外科学 | 55558篇 |
综合类 | 51366篇 |
现状与发展 | 64篇 |
一般理论 | 29篇 |
预防医学 | 37533篇 |
眼科学 | 8999篇 |
药学 | 36619篇 |
249篇 | |
中国医学 | 17720篇 |
肿瘤学 | 35868篇 |
出版年
2024年 | 888篇 |
2023年 | 3614篇 |
2022年 | 9331篇 |
2021年 | 12194篇 |
2020年 | 9324篇 |
2019年 | 7581篇 |
2018年 | 29467篇 |
2017年 | 24785篇 |
2016年 | 26410篇 |
2015年 | 12562篇 |
2014年 | 15321篇 |
2013年 | 15182篇 |
2012年 | 27893篇 |
2011年 | 43373篇 |
2010年 | 34504篇 |
2009年 | 24506篇 |
2008年 | 34862篇 |
2007年 | 36859篇 |
2006年 | 15278篇 |
2005年 | 15693篇 |
2004年 | 12734篇 |
2003年 | 12911篇 |
2002年 | 9778篇 |
2001年 | 6041篇 |
2000年 | 5606篇 |
1999年 | 4801篇 |
1998年 | 2869篇 |
1997年 | 2726篇 |
1996年 | 2198篇 |
1995年 | 1990篇 |
1994年 | 1631篇 |
1993年 | 1048篇 |
1992年 | 1416篇 |
1991年 | 1198篇 |
1990年 | 1094篇 |
1989年 | 884篇 |
1988年 | 829篇 |
1987年 | 753篇 |
1986年 | 579篇 |
1985年 | 465篇 |
1984年 | 282篇 |
1983年 | 220篇 |
1982年 | 142篇 |
1981年 | 135篇 |
1980年 | 142篇 |
1979年 | 159篇 |
1978年 | 79篇 |
1977年 | 78篇 |
1976年 | 69篇 |
1974年 | 86篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
While balloon valvuloplasty has been widely used for the treatment of congenital valvular pulmonary stenosis (PS) in children and adults, its use in elderly patients is less common. An 80-year-old woman with congenital valvular PS received valvuloplasty with double-balloon technique. Right ventricle systolic pressure and pulmonary valve systolic pressure gradient decreased from 95 to 44 mm Hg and from 75 to 35 mm Hg, respectively. Follow-up Doppler echocardiography 2 months later showed further decrease in the transvalvular systolic pressure gradient to 29 mm Hg. The patient had symptomatic relief, and no major complication was noted. Balloon pulmonary valvuloplasty can be an effective treatment for elderly patients with congenital valvular PS. 相似文献
32.
Wan-Ling Ho Tien-Wu Yang Wei-Chu Chi Hong-Jen Chang Li-Min Huang Mei-Hwei Chang 《台湾医志》2005,104(6):398-401
BACKGROUND AND PURPOSE: This study investigated the characteristics of intussusception in Taiwanese children of different age groups, including the incidence, length of hospitalization and hospital costs. METHODS: Children with a diagnosis of intussusception who were hospitalized from 1999 through 2001 were identified from a nationwide health insurance claims database. The incidence of intussusception was calculated by age, gender, and season. Length of hospitalization and hospital costs were also analyzed. RESULTS: A total of 6988 cases of intussusception were identified in Taiwan from 1999 to 2001. Among them, 4859 cases occurred in children below 15 years of age. The average incidence among children below age 15 years was 34.5 per 100,000, with a peak incidence of 118.8 per 100,000 observed among children younger than 24 months old. The highest incidence of intussusception in Taiwanese children occurred between 12 and 24 months of age. According to the data for patients below 15 years of age hospitalized for intussusception in year 2000, males were more likely to be affected than females (61.3% vs 38.7%). Intussusception-related hospitalizations were rare in infants in the first few months of life, increased in those 6 to 12 months old, and peaked among children 1 to 3 years old. Among the 952 patients with intussusception admitted to hospitals in 2000, 297 (31.2%) received surgery, incurring higher median medical costs (New Taiwan Dollars [NT dollars] 42,265 or US dollars 1234) and longer median hospital stay (6.2 days) than the 655 patients who did not require surgery (NT dollars 6290 or US dollars 185 for hospitalization of 2.4 days). CONCLUSIONS: The study found that the incidence of intussusception peaked in the second year of life in Taiwanese children. There was also a male predominance and lack of seasonal variation in incidence. 相似文献
33.
Sheng-Chieh Lin Shyh-Dar Shyur Yi-Chun Ma Li-Hsin Huang Hung-Chang Lee Wen-I Lee 《台湾医志》2005,104(6):421-426
X-linked hyper-immunoglobulin M (IgM) syndrome (XHIGM) is a rare genetic primary immunodeficiency disease caused by mutations of the CD40 ligand (CD40L) gene with normal or elevated levels of IgM and markedly decreased serum IgG, IgA, and IgE. Liver disease may occur as a clinical manifestation in XHIGM. This complication appears to increase with age. We report an 18-year-old male patient who had recurrent episodes of acalculous cholecystitis (AC) and sclerosing cholangitis (SC). The diagnosis of XHIGM was confirmed by the finding of CD40L expression < 1% of normal and a tyrosine 169 asparaginase (t526a) mutation in exon 5 (the tumor necrosis factor domain) of the CD40L gene. The patient had direct hyperbilirubinemia (direct bilirubin 5.5 mg/dL, total bilirubin 8.7 mg/dL), cholestasis (alkaline phosphatase 1133 U/L, gamma-glutamyl transferase 1019 U/L) and elevated transaminases (aspartate aminotransferase 70 U/L, alanine aminotransferase 101 U/L). Findings on abdominal ultrasound and abdominal computed tomography were compatible with AC. After the fourth episode of cholecystitis, cholecystectomy and liver biopsy were performed. Operative cholangiography revealed poor opacification of the hepatic duct and proximal common bile duct; the upstream intrahepatic bile ducts were not visualized. The biopsy specimen showed marked fibrosis of the portal areas. Enterococcus species was cultured from the bile. Children or adolescents with recurrent AC and SC should be evaluated for an underlying immunodeficiency syndrome such as XHIGM. 相似文献
34.
Tumor metastasis to the pancreas is a rare but recognized cause of acute pancreatitis. Autopsy series have reported a 24-40% of pancreatic involvement in small cell lung cancer. However, only a very few cases of tumor-induced acute pancreatitis have been described. Budd-Chiari syndrome complicating lung cancer is a rarely reported condition. We report a 68-year-old woman with extensive small cell lung cancer with the unusual initial presentation of both acute pancreatitis and acute Budd-Chiari syndrome. This patient suffered from progressive epigastralgia for 3 weeks. Severe epigastralgia with radiation to back and progressive jaundice developed 2 days prior to admission. After admission, the liver enlarged rapidly and the ascites increased markedly. Chest roentgenogram showed a mass lesion over the left lower lung field. Poorly differentiated carcinoma cells were found in ascites and bone marrow. The patient died on the ninth day of hospitalization before chemotherapy was initiated. Prompt diagnosis of extensive-stage small cell lung cancer may allow early chemotherapy treatment which favorably influences recovery when the pancreatitis is mild. Although prolonged survival might have been expected had this patient recovered from pancreatitis and received chemotherapy, diagnosis was delayed due to difficulty in immunohistochemical diagnosis of the tumor and the unusual clinical presentation. The use of stains employing antibodies against neurofilament and neuron-specific enolase cell antigens is important for early diagnosis of poorly differentiated metastatic tumor cells. 相似文献
35.
Pneumocephalus is a very rare complication of video-assisted thoracoscopic surgery (VATS). A 66-year-old man developed pneumocephalus secondary to thoracoscopic excision of a neurogenic tumor in the posterior mediastinum. Pneumocephalus was diagnosed by brain computed tomography. Neurosurgical intervention was performed after conservative therapy had failed. The patient's condition had resolved without any neurologic sequelae 2 years later. When a patient has a relatively large amount of chest tube drainage and neurologic symptoms after VATS, the possibility of pneumocephalus due to cerebrospinal fluid leakage must be considered. 相似文献
36.
37.
38.
39.
Henry Cisneros 《AIDS and behavior》2007,11(2):7-8
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference. 相似文献
40.
目的 探讨急性胰腺炎与血浆维生素C、维生素E和 β 胡萝卜素的关系。 方法 采用分光光度比色分析法检测 6 8例急性胰腺炎和 4 0例健康献血员血浆三种维生素含量。结果 急性胰腺炎组维生素C、维生素E、β 胡萝卜素含量较对照组显著降低 (P <0 .0 1) ,且随着禁食时间的延长呈逐渐降低趋势。 结论 急性胰腺炎时患者体内的氧化和抗氧化系统平衡失调 ,补充抗氧化维生素有助于病情的恢复。 相似文献