全文获取类型
收费全文 | 10146篇 |
免费 | 731篇 |
国内免费 | 355篇 |
专业分类
耳鼻咽喉 | 60篇 |
儿科学 | 185篇 |
妇产科学 | 552篇 |
基础医学 | 264篇 |
口腔科学 | 323篇 |
临床医学 | 1407篇 |
内科学 | 2949篇 |
皮肤病学 | 59篇 |
神经病学 | 114篇 |
特种医学 | 265篇 |
外国民族医学 | 1篇 |
外科学 | 906篇 |
综合类 | 1573篇 |
预防医学 | 615篇 |
眼科学 | 21篇 |
药学 | 1261篇 |
24篇 | |
中国医学 | 519篇 |
肿瘤学 | 134篇 |
出版年
2024年 | 18篇 |
2023年 | 209篇 |
2022年 | 323篇 |
2021年 | 490篇 |
2020年 | 453篇 |
2019年 | 444篇 |
2018年 | 397篇 |
2017年 | 415篇 |
2016年 | 408篇 |
2015年 | 393篇 |
2014年 | 746篇 |
2013年 | 853篇 |
2012年 | 666篇 |
2011年 | 698篇 |
2010年 | 558篇 |
2009年 | 493篇 |
2008年 | 435篇 |
2007年 | 449篇 |
2006年 | 407篇 |
2005年 | 378篇 |
2004年 | 290篇 |
2003年 | 227篇 |
2002年 | 210篇 |
2001年 | 163篇 |
2000年 | 149篇 |
1999年 | 121篇 |
1998年 | 88篇 |
1997年 | 85篇 |
1996年 | 78篇 |
1995年 | 71篇 |
1994年 | 69篇 |
1993年 | 48篇 |
1992年 | 48篇 |
1991年 | 40篇 |
1990年 | 39篇 |
1989年 | 29篇 |
1988年 | 36篇 |
1987年 | 18篇 |
1986年 | 19篇 |
1985年 | 25篇 |
1984年 | 30篇 |
1983年 | 20篇 |
1982年 | 21篇 |
1981年 | 15篇 |
1980年 | 19篇 |
1979年 | 4篇 |
1978年 | 13篇 |
1977年 | 11篇 |
1976年 | 5篇 |
1973年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
目的 探讨药物流产不全的原因及诊治方法。方法 收集药物流产后阴道出血达 1月以上而未行治疗者 ,根据B超等协助诊断 ,予以清宫后治愈。结果 5 4例全部行清宫术 ,刮出物病检均为机化变性绒毛组织 ,部分伴炎性反应。清宫后阴道出血停止。结论 对于药物流产后阴道出血时间过长者 ,应及早明确诊断 ,及时行清宫术。 相似文献
72.
Andrew N. Fleischman William T. Li Andrew J. Luzzi Duncan S. Van Nest Marc C. Torjman Eric S. Schwenk William A. Arnold Javad Parvizi 《The Journal of arthroplasty》2021,36(6):1921-1925.e1
BackgroundChronic nonsteroidal anti-inflammatory drug (NSAID) use is associated with gastrointestinal bleeding via inhibition of endogenous mucosal protection and platelet aggregation. This study aimed to determine whether extended NSAIDs after joint arthroplasty is associated with increased risk of gastrointestinal bleeding.MethodsThis was a retrospective study examining 28,794 adults who underwent joint arthroplasty by one of 50 surgeons from 2016 to 2018. Episodes of gastrointestinal bleeding within 90 days postoperatively were identified prospectively. Postoperative medications were reported directly by patients with electronic questionnaires. The primary analysis was performed using binary logistic regression.ResultsA total of 74 (0.26%) episodes of gastrointestinal bleeding occurred within 90 days (median 8 days) postoperatively. Of 5086 patients with complete data included in the primary analysis, 59.6% had used NSAIDs with median duration of 2 weeks (interquartile range, 0-6 weeks). Patients with gastrointestinal bleeding were significantly older (71.3 vs 67.0 years), required longer hospitalizations (2.1 vs 1.5 days), and more commonly had a history of peptic ulcers (10.8% vs 0.9%). However, there was no positive association between NSAID use and gastrointestinal bleeding. In fact, the odds of gastrointestinal bleeding were lower in patients taking NSAIDs. Gastrointestinal bleeding was associated with anticoagulants, antiplatelet agents, and, to a lesser extent, aspirin.ConclusionNSAIDs were not associated with gastrointestinal bleeding and may be prescribed safely for a majority of patients after joint arthroplasty. The greatest odds of gastrointestinal bleeding occurred in patients with peptic ulcer disease and those who received antiplatelet and anticoagulation agents. Increasing age and bilateral surgery were also associated with gastrointestinal bleeding.Level of EvidenceLevel III. 相似文献
73.
目的探讨结直肠癌根治术后吻合口出血病人使用急诊内镜检查及止血的安全性和有效性。方法回顾性分析华中科技大学同济医学院附属协和医院2014年1月至2019年11月结直肠癌根治术后吻合口出血行急诊内镜检查以及内镜下治疗的28例病人资料。结果28例病人包括直肠癌术后15例、左半结肠癌术后3例及右半结肠癌术后10例。上述病例均完成急诊内镜检查并接受内镜下止血治疗。仅1例直肠癌术后吻合口出血病人因合并吻合口漏经内镜下止血效果不佳,最终接受外科手术治疗;其余27例吻合口出血病人均经过内镜止血成功。所有病例住院期间无再发出血,内镜诊疗并未导致术后吻合口漏及穿孔。结论结直肠癌根治术后吻合口出血急诊内镜检查及止血的方案,不增加吻合口出血、穿孔及漏等风险。术后急诊内镜下止血是安全有效的治疗手段,能明显提高止血成功率,降低再手术率。在病人出血后8 h内行急诊内镜是非常关键的诊治措施。 相似文献
74.
胆胰疾病病人经外科手术、介入或内镜治疗后发生迟发性大出血时,救治困难、病死率高,而术后假性动脉瘤形成和破裂是主要原因。胆胰手术后假性动脉瘤成因复杂多样,瘤体破裂出血前临床症状隐匿。从致病机制源头预防假性动脉瘤形成、重视前哨出血等特征性临床症状,将会有效确保胆胰疾病病人围手术期安全性,提高术后迟发性大出血的救治成功率。 相似文献
75.
Continued advances in the understanding and management of congenital heart disease (CHD) mean that over 90% of children born with CHD now survive to adulthood. This in turn results in greater numbers of adult patients presenting for medical and surgical care at non-specialist centres. A simple classification of adult congenital heart disease (ACHD) according to complexity can help clinicians to understand the implications of the specific cardiac anomaly encountered. Issues relating to the conduct of anaesthesia in ACHD patient include careful attention to euvolaemia, the preservation of sinus rhythm and cardiac output, and in complex patients, manipulating the balance between systemic and pulmonary blood flows. Additionally, effective antibiotic prophylaxis and the prevention of either excessive bleeding or thromboembolism are vitally important. It should not be forgotten that although many patients with simple or repaired cardiac lesions may be very well managed in a non-specialist unit, those with Eisenmenger’s syndrome or severe pulmonary hypertension have an extremely high risk of death in the perioperative period, and in all but life-threatening situations should always be managed within specialist centres. 相似文献
76.
77.
Objective To investigate the relationship between estradiol, progesterone and endothelin (ET) and abnormal uterine bleeding after using sub-dermal contraceptive implant Materials & methods A prospective self-control clinical trial was conducted in 29 women in the self-control group. Blood samples were obtained on four occasions across the different phases of menstrual cycle before and after using implant. A blood sample was taken for a single determination in another 59 women in the already-use implant group. Plasma of estradiol, progesterone and endothelin were determined by using radioimmunoassays (RIA) in both groups.Results The level of estradiol and progesterone had no significant differences in women before and after using implant in self-control group. The level of estradiol,progesterone had no differences between women with normal and abnormal menstrual cycle in both groups. The levels of plasma endothelin (ET) in women with abnormal bleeding pattern were higher than women with normal bleeding pattern, but difference was not significant. Women with abnormal bleeding pattern had significantly higher ET level than that in women with normal bleeding pattern before using implants,especially in early-proliferative phase and mid-proliferative phase. the level of plasma endothelin was significantly higher in women with disturbed bleeding pattern than that in normal women in the already-use group.Conclusion High serum concentrations of ET are likely to be correlated with abnormal uterine bleeding in long-term subdermal contraceptive implants users. 相似文献
78.
脑损害昏迷患者上消化道出血的预防 总被引:3,自引:2,他引:1
目的 探讨脑损害昏迷患者上消化道出血的发病因素和预防措施。方法 对274例脑损害昏迷患者,分析其并发上消化道出血的内环境因素和预防效果。结果 并发上消化道出血49例,占17.9%,而在ICU条件下早期鼻饲西沙必利、奥美拉唑及氢氧化铝凝胶预防组消化道出血的发生率为40%(2/50);伤后休克低血压、低氧血症、低钠血症、氮质血症、酸中毒、高血糖、高脂质过氧化水平均可增加上消化道出血的发生率。结论 ICU条件下维护内环境平衡、早期鼻饲、胃肠动力及抑酸药物应用,可显著关注脑损害昏迷患者上消化道出血的发生。 相似文献
79.
新生儿应激性溃疡出血38例临床分析 总被引:5,自引:1,他引:4
目的 :探讨新生儿应激性溃疡出血病儿的防治措施。方法 :综合治疗原发病 ,纠正缺氧、酸中毒、抗感染等 ,静滴止血敏、甲氰咪胍止血 ,效果欠佳者加用云南白药鼻饲。结果 :治疗 3 8例 ,治愈率 86.84% ,病死率 10 .5 4% ,死因为多脏器功能衰竭和DIC。结论 :止血敏、甲氰咪胍合用止血效果好 ,加用云南白药可用于防治应激性溃疡出血。 相似文献
80.