全文获取类型
收费全文 | 5004篇 |
免费 | 357篇 |
国内免费 | 131篇 |
专业分类
耳鼻咽喉 | 60篇 |
儿科学 | 54篇 |
妇产科学 | 42篇 |
基础医学 | 235篇 |
口腔科学 | 53篇 |
临床医学 | 521篇 |
内科学 | 446篇 |
皮肤病学 | 44篇 |
神经病学 | 445篇 |
特种医学 | 167篇 |
外国民族医学 | 1篇 |
外科学 | 1871篇 |
综合类 | 629篇 |
预防医学 | 367篇 |
眼科学 | 39篇 |
药学 | 207篇 |
2篇 | |
中国医学 | 65篇 |
肿瘤学 | 244篇 |
出版年
2024年 | 11篇 |
2023年 | 70篇 |
2022年 | 98篇 |
2021年 | 169篇 |
2020年 | 145篇 |
2019年 | 199篇 |
2018年 | 157篇 |
2017年 | 131篇 |
2016年 | 132篇 |
2015年 | 109篇 |
2014年 | 252篇 |
2013年 | 298篇 |
2012年 | 220篇 |
2011年 | 227篇 |
2010年 | 176篇 |
2009年 | 223篇 |
2008年 | 189篇 |
2007年 | 146篇 |
2006年 | 200篇 |
2005年 | 157篇 |
2004年 | 146篇 |
2003年 | 156篇 |
2002年 | 136篇 |
2001年 | 160篇 |
2000年 | 107篇 |
1999年 | 94篇 |
1998年 | 112篇 |
1997年 | 116篇 |
1996年 | 102篇 |
1995年 | 88篇 |
1994年 | 106篇 |
1993年 | 93篇 |
1992年 | 79篇 |
1991年 | 93篇 |
1990年 | 73篇 |
1989年 | 67篇 |
1988年 | 74篇 |
1987年 | 62篇 |
1986年 | 49篇 |
1985年 | 58篇 |
1984年 | 46篇 |
1983年 | 25篇 |
1982年 | 20篇 |
1981年 | 38篇 |
1980年 | 30篇 |
1979年 | 21篇 |
1978年 | 8篇 |
1977年 | 13篇 |
1975年 | 4篇 |
1974年 | 3篇 |
排序方式: 共有5492条查询结果,搜索用时 46 毫秒
31.
Complications associated with maxillary nerve block anaesthesia via the greater palatine canal 总被引:2,自引:0,他引:2
Anthony M. Sved John D. Wong Head Peter Donkor James Horan Leesa Rix Justin Curtin and Russell Vickers 《Australian dental journal》1992,37(5):340-345
This paper documents the type, frequency and duration of complications associated with regional anaesthesia of the maxillary nerve via the greater palatine canal in a series of 101 patients treated in the Oral Surgery Department, United Dental Hospital of Sydney. 相似文献
32.
Andrew M Speer Mark W Willis Peter Herscovitch Margaret Daube-Witherspoon Jennifer Repella Shelton Brenda E Benson Robert M Post Eric M Wassermann 《Neuropsychopharmacology》2003,54(8):818-825
BACKGROUND: Repetitive transcranial magnetic stimulation (rTMS) affects the excitability of the motor cortex and is thought to influence activity in other brain areas as well. We combined the administration of varying intensities of 1-Hz rTMS of the motor cortex with simultaneous positron emission tomography (PET) to delineate local and distant effects on brain activity. METHODS: Ten healthy subjects received 1-Hz rTMS to the optimal position over motor cortex (M1) for producing a twitch in the right hand at 80, 90, 100, 110, and 120% of the twitch threshold, while regional cerebral blood flow (rCBF) was measured using H(2)(15)O and PET. Repetitive transcranial magnetic stimulation (rTMS) was delivered in 75-pulse trains at each intensity every 10 min through a figure-eight coil. The regional relationship of stimulation intensity to normalized rCBF was assessed statistically. RESULTS: Intensity-dependent rCBF increases were produced under the M1 stimulation site in ipsilateral primary auditory cortex, contralateral cerebellum, and bilateral putamen, insula, and red nucleus. Intensity-dependent reductions in rCBF occurred in contralateral frontal and parietal cortices and bilateral anterior cingulate gyrus and occipital cortex. CONCLUSIONS: This study demonstrates that 1-Hz rTMS delivered to the primary motor cortex (M1) produces intensity-dependent increases in brain activity locally and has associated effects in distant sites with known connections to M1. 相似文献
33.
M. Vincenzi T. Morlino P. Allegri E. Barbieri F. Cappelletti U. Delio R. Ometto P. Maiolino 《Clinical cardiology》1981,4(1):15-21
Alterations in cardiovascular function induced by the acute intravenous administration of verapamil (5 or 10 mg) in 52 patients (29 with ischemic heart disease and 23 without heart disease) were evaluated with use of invasive techniques (right and left heart catheterization, left ventricular cineangiography, and coronary arteriography). The most significant changes were represented by a decrease in systemic vascular resistance and systemic arterial pressure, and an increase in heart rate and cardiac output. Contractility indexes were not depressed in either group, and altered ventricular wall motion tended to improve to a slightly smaller degree than in patients treated with nitroglycerin. The use of verapamil in patients with ischemic heart disease appears to be safe, and concern about the negative inotropic influences in humans no longer seems justified. 相似文献
34.
35.
Unilateral epidural analgesia occurring in a parturient three times in successive pregnancies is reported. Possible causes are reviewed, and clinical and radiological evidence in support of the most likely explanation are presented. 相似文献
36.
The influence of epidural administration of fentanyl infusion on gastric emptying in labour 总被引:1,自引:0,他引:1
The effect of epidural infusions containing fentanyl on maternal gastric emptying in labour was examined using the rate of paracetamol absorption. Women were randomly allocated to receive one of two epidural infusions, bupivacaine 0.125% alone or bupivacaine 0.0625% with fentanyl 2.5 μgml−1 at a rate of 10–12 mlh−1 . Paracetamol 1.5 g was given orally to women after either 30 ml of the infusion solution had been given (mean time 2.5 h, study A) or 40–50 ml (mean time 4.5 h, study B). Six venous blood samples were taken over the next 90 min for measurement of plasma paracetamol concentration. There were no significant differences in maximum plasma paracetamol concentration, time to maximum paracetamol concentration and area under the concentration–time curve between the two groups for study A. In study B the time to maximum plasma paracetamol concentration was significantly delayed in women receiving > 100 μg fentanyl compared with controls (p < 0.05). We conclude that the dose of fentanyl that may delay gastric emptying when given by epidural infusion is greater than 100 μg. 相似文献
37.
Bilateral continuous paravertebral block used for postoperative analgesia in an infant having bilateral thoracotomy 总被引:3,自引:0,他引:3
We describe the successful postoperative pain management in an 11-month-old infant who underwent bilateral thoracotomy, using continuous infusions of bupivacaine into two directly placed paravertebral catheters. Haemodynamic parameters and pain scores were measured 1–2 h for 60 h while the infusions were continued and, intermittently, blood samples were taken for subsequent measurement of serum bupivacaine concentrations. The technique provided effective pain relief and the infant required no other analgesia postoperatively. There were no adverse haemodynamic consequences or complications relating to either catheter placement or drug infusions. Serum concentrations of bupivacaine remained below toxic levels throughout the study period, though accumulation did occur. 相似文献
38.
Flow dynamics through spinal needles 总被引:2,自引:0,他引:2
We examined the flow pattern produced when liquid dye was actively injected into a fluid medium at various flows through five different commonly used spinal needles. At all flows, the Whitacre-type needles produced a directional stream exiting at an angle from the longitudinal axis. At intermediate rates the stream developed tracks which disappeared at faster rates. The Quincke needle always produced an undeviated stream of dye and did not form tracks at any flow rate. When a perspex plate (representing the spinal cord) was interposed in front of the needle, the dispersion of dye was always unidirectional from the Whitacre needle and bidirectional from the Quincke needle. The dye adhered to the surface of the plate as a concentrated film at slow rates and at faster rates it dispersed turbulently for both types of needle. 相似文献
39.
An epidural abscess due to resistant Staphylococcus aureus following epidural catheterisation 总被引:1,自引:0,他引:1
We report a case of abscess formation after epidural analgesia, a rare complication that developed in our patient 13 days after placement of a thoracic epidural catheter for patient controlled analgesia. Culture of the pus grew methicillin-resistant Staphylococcus aureus . Although early diagnosis and rapid management have been reported to yield a satisfactory outcome, the case we describe ended in severe sequelae. 相似文献
40.
The effect of subhypnotic doses of propofol on intrathecal morphine-induced pruritus was studied in a prospective, randomly allocated, double-blind controlled trial. Fifty-eight women undergoing elective lower segment Caesarean section for a singleton fetus received spinal anaesthesia with 2.5 ml hyperbaric 0.5% bupivacaine and 0.2 mg of preservative-free morphine. They then received propofol 1 ml (10 mg) or Intralipid 1 ml (control group) intravenously after delivery. Pruritus was assessed using a five-point verbal rating scale at hourly intervals for 8 h. A second dose of their allocated treatment drug was administered at the first recording of significant pruritus. The pruritus score was reassessed after 5 min and the treatment was repeated if pruritus remained. There were no differences between the groups in the onset of pruritus or its successful treatment. No adverse side-effects were associated with this dose of propofol. There were no differences in the incidence of post-operative nausea and vomiting between the two groups. Subhypnotic propofol is not an effective treatment for intrathecal morphine-induced pruritus in women following Caesarean section. 相似文献