收费全文 | 30380篇 |
免费 | 2471篇 |
国内免费 | 2427篇 |
耳鼻咽喉 | 90篇 |
儿科学 | 325篇 |
妇产科学 | 1240篇 |
基础医学 | 1770篇 |
口腔科学 | 619篇 |
临床医学 | 2683篇 |
内科学 | 7870篇 |
皮肤病学 | 1438篇 |
神经病学 | 4064篇 |
特种医学 | 878篇 |
外科学 | 7040篇 |
综合类 | 293篇 |
预防医学 | 4823篇 |
眼科学 | 161篇 |
药学 | 841篇 |
中国医学 | 9篇 |
肿瘤学 | 1134篇 |
2018年 | 279篇 |
2017年 | 424篇 |
2016年 | 1058篇 |
2015年 | 1037篇 |
2014年 | 1288篇 |
2013年 | 2178篇 |
2012年 | 487篇 |
2011年 | 630篇 |
2010年 | 1034篇 |
2009年 | 1487篇 |
2008年 | 598篇 |
2007年 | 573篇 |
2006年 | 1099篇 |
2005年 | 922篇 |
2004年 | 737篇 |
2003年 | 845篇 |
2002年 | 830篇 |
2001年 | 956篇 |
2000年 | 721篇 |
1999年 | 828篇 |
1998年 | 827篇 |
1997年 | 816篇 |
1996年 | 1002篇 |
1995年 | 1147篇 |
1994年 | 963篇 |
1993年 | 843篇 |
1992年 | 882篇 |
1991年 | 777篇 |
1990年 | 642篇 |
1989年 | 619篇 |
1988年 | 588篇 |
1987年 | 629篇 |
1986年 | 507篇 |
1985年 | 614篇 |
1984年 | 538篇 |
1983年 | 453篇 |
1982年 | 463篇 |
1981年 | 431篇 |
1980年 | 406篇 |
1979年 | 387篇 |
1978年 | 355篇 |
1977年 | 348篇 |
1976年 | 276篇 |
1975年 | 229篇 |
1974年 | 217篇 |
1973年 | 182篇 |
1972年 | 147篇 |
1968年 | 151篇 |
1967年 | 164篇 |
1966年 | 131篇 |
Methods: Ninety-two parturients were randomly allocated to receive a 48-h continuous intrawound infusion with 240 ml containing 300 mg diclofenac, 0.2% ropivacaine, or saline. In the ropivacaine and saline groups, patients also received 75 mg intravenous diclofenac every 12 h for 48 h. Postoperative evaluation included intravenous morphine consumption by patient-controlled analgesia and visual analog pain scores. Punctate mechanical hyperalgesia surrounding the wound and presence of residual pain after 1 and 6 months were also assessed.
Results: Continuous diclofenac infusion significantly reduced postoperative morphine consumption (18 mg; 95% confidence interval, 12.7-22.2) in comparison with saline infusion and systemic diclofenac (38 mg; 95% confidence interval, 28.8-43.7) (P = 0.0009) without unique adverse effects. Postoperative analgesia produced by local diclofenac infusion was as effective as local ropivacaine infusion with systemic diclofenac. 相似文献
Methods: Twelve simulated acute intraoperative scenarios were designed to assess the performance of 64 residents and 35 anesthesiologists. The participants were divided into four groups based on their training and experience. There were 31 new CA-1, 12 advanced CA-1, and 22 CA-2/CA-3 residents as well as a group of 35 experienced anesthesiologists who participated in the assessment. Each participant managed a set of simulated events. The advanced CA-1 residents, CA-2/CA-3 residents, and 35 anesthesiologists managed 8 of 12 intraoperative simulation exercises. The 31 CA-1 residents each managed 3 intraoperative scenarios.
Results: The new CA-1 residents received lower scores on the simulated intraoperative events than the other groups of participants. The advanced CA-1 residents, CA-2/CA-3 residents, and anesthesiologists performed similarly on the overall assessment. There was a wide range of scores obtained by individuals in each group. A number of the exercises were difficult for the majority of participants to recognize and treat, but most events effectively discriminated among participants who achieved higher and lower overall scores. 相似文献
Methods: Between May and December 2004, data on 711 consecutive peripheral vascular surgery patients were collected from 11 hospitals in The Netherlands. This survey was conducted within the infrastructure of the Euro Heart Survey Programme. The authors retrospectively applied the ACC/AHA guideline algorithm to each patient in their data set and subsequently compared observed clinical practice data with these recommendations.
Results: Although 185 of the total 711 patients (26%) fulfilled the ACC/AHA guideline criteria to recommend preoperative noninvasive cardiac testing, clinicians had performed testing in only 38 of those cases (21%). Conversely, of the 526 patients for whom noninvasive testing was not recommended, guidelines were followed in 467 patients (89%). Overall, patients who had not been tested, irrespective of guideline recommendation, received less cardioprotective medications, whereas patients who underwent noninvasive testing were significantly more often treated with cardiovascular drugs ([beta]-blockers 43% vs. 77%, statins 52% vs. 83%, platelet inhibitors 80% vs. 85%, respectively; all P < 0.05). Moreover, the authors did not observe significant differences in cardiovascular medical therapy between patients with a normal test result and patients with an abnormal test result. 相似文献
Methods: Five hundred twenty-six patients were enrolled. They received a single dose of vecuronium, rocuronium, or atracurium to facilitate tracheal intubation and received no more relaxant thereafter. Neuromuscular blockade was not reversed at the end of the procedure. On arrival in the postanesthesia care unit, the TOF ratio was measured at the adductor pollicis, using acceleromyography. Head lift, tongue depressor test, and manual assessment of TOF and DBS fade were also performed. The time delay between the injection of muscle relaxant and quantitative measurement of neuromuscular blockade was calculated from computerized anesthetic records.
Results: The TOF ratios less than 0.7 and 0.9 were observed in 16% and 45% of the patients, respectively. Two hundred thirty-nine patients were tested 2 h or more after the administration of the muscle relaxant. Ten percent of these patients had a TOF ratio less than 0.7, and 37% had a TOF ratio less than 0.9. Clinical tests (head lift and tongue depressor) and manual assessment of fade showed a poor sensitivity (11-14%) to detect residual blockade (TOF < 0.9). 相似文献
Methods: The TMD, airway, and demographic data of 379 patients were collected. To test the bent length influence, patients were enrolled in group A (158 patients, TMD <= 5.5 cm) and group B (131 patients, TMD > 5.5 cm) and were intubated randomly using the lower (6.5 cm) and upper (8.5 cm) limits of the suggested range. Success rate and lightwand search time were compared.
Results: In group A, the success rate was 98.8% with 6.5-cm bent length and 78.2% with 8.5-cm bent length (P < 0.05). Search times were 5.7 +/- 2.90 and 8.9 +/- 5.80 s with 6.5- and 8.5-cm bent length, respectively (P < 0.01). In group B, there was no statistical difference in success rate and search time between 6.5- and 8.5-cm bent length. 相似文献