排序方式: 共有134条查询结果,搜索用时 15 毫秒
1.
2.
Weinbroum AA 《Anesthesia and analgesia》2002,94(6):1547-1552
Central N-methyl-D-aspartate receptors modulate postoperative pain. We compared the effects of preincision oral dextromethorphan (DM), an N-methyl-D-aspartate receptor antagonist, on postoperative IV patient-controlled analgesia morphine demand and on subjective variables in 80 patients undergoing lower-body procedures who were randomly assigned to epidural lidocaine (LA; 16 mL, 1.6%) or general anesthesia (GA). The patients were premedicated 90 min before surgery with placebo or DM 90 mg (20 patients per group) in a double-blinded manner. Postoperative IV patient-controlled analgesia morphine administration started when subjective pain intensity was > or =4 of 10 (visual analog scale) and lasted 2 h. Observation continued up to 3 days, during which patients could use diclofenac. LA-DM and GA-DM patients required 45%-50% less morphine and diclofenac compared with their placebo counterparts (P < 0.001). However, GA-DM patients made twice as many attempts to self-administer morphine as LA-DM patients (P = 0.005). Eight LA-DM versus two GA-DM patients (P < 0.01) used no morphine or diclofenac. All DM patients experienced significantly (P < 0.001) less pain, were less sedated, and felt better than their placebo counterparts; however, compared with placebo, DM improved subjective scorings in the GA patients more significantly (P < 0.05) than in the LA patients. We conclude that oral DM 90 mg in patients undergoing surgery under LA or GA reduces morphine and diclofenac use by approximately 50% in the immediate and late postoperative period compared with placebo. Subjectively scored levels of pain, sedation, and well-being were better as well. 相似文献
3.
Pevni D Frolkis I Schwartz D Schwartz I Chernichovski T Kramer A Ben-Gal Y Uretzky G Shapira I Weinbroum A 《European journal of clinical investigation》2008,38(9):649-655
Background Tumour necrosis factor‐alpha (TNF‐α) plays a key role in causing ischaemia/reperfusion (I/R) injury. I/R also causes activation of xanthine oxidase and dehydrogenase (XDH + XO) system that, via generated free radicals, causes organ damage. We investigated the effect of ischaemia, reperfusion and non‐ischaemic prolonged perfusion (NIP) on TNF‐α and XDH + XO production in an isolated perfused rat liver model. Materials and methods Rat livers underwent 150 min NIP (control group) or two hours of ischaemia followed by reperfusion (I/R group). TNF‐α (TNF‐α mRNA and protein level), XDH + XO production and bile secretion were determined in tissue and effluent at baseline, at 120 min of ischaemia, after 30 min of reperfusion (I/R group) and after 120 and 150 min of prolonged perfusion (control). Results Unexpectedly, neither ischaemia nor reperfusion had any effect on TNF‐α production. TNF‐α in effluent was 11 ± 4·8 pg mL?1 at baseline, 7 ± 3·2 pg mL?1 at the end of ischaemia, and 13 ± 5·3 pg mL?1 after 30 min of reperfusion. NIP, however, caused a significant increase of TNF‐α synthesis and release. TNF‐α effluent level after 120 and 150 min of perfusion was 392 ± 78·7 pg mL?1 and 408 ± 64·3 pg mL?1, respectively. TNF‐α mRNA in tissue was also significantly elevated compared to baseline levels (1·31 ± 0·2 P < 0·001 and 1·38 P < 0·002, respectively). Decrease of liver function (expressed by bile secretion) during I/R and NIP was accompanied by significant XDH + XO elevation. Conclusion This is the first evidence that NIP, and not I/R, is the decisive trigger for TNF‐α production. This study leads to a better understanding of pathogenesis of liver I/R and perfusion damage. 相似文献
4.
Hospitalized coronavirus disease 2019 (COVID-19)-infected patients suffer from both physical impairments and mental stress. Respiratory insufficiency and cardiovascular disturbances require most of the intensive care interventions, but they are also accompanied by depressive conditions, sadness and fear of dying. Sedatives are mostly respiratory and cardiovascular depressants and do not provide resistance to the pro-inflammatory burst induced by the virus. Ketamine is a unique and safe drug that enables well-controlled sedation and anesthesia, attenuates depression and mitigates suicidal thoughts, without depressing respiratory or cardiovascular mechanics. This brief communication highlights the benefits potentially provided by ketamine to patients hospitalized for COVID-19 infection. 相似文献
5.
Weinbroum AA Gorodetzky A Nirkin A Kollender Y Bickels J Marouani N Rudick V Meller I 《Cancer》2002,95(5):1164-1170
BACKGROUND: Postoperative pain is mediated centrally by N-methyl-D-aspartate (NMDA) receptors. The beneficial effects of preincision oral dextromethorphan (DM), which is an NMDA antagonist, on postoperative pain and intravenous patient-controlled analgesia (IV-PCA) morphine (MO) consumption have been examined in patients undergoing surgery. The authors investigated 75 patients who underwent surgery for bone and soft tissue malignancies, in whom postoperative pain is more severe compared with patients who undergo general surgery. METHODS: Patients received placebo, DM 60 mg, or DM 90 mg (25 patients per group) before surgery and on each of the two following days in a randomized, double-blind, placebo-controlled manner. Postoperative IV-PCA MO was started when subjective pain intensity was >/= 4/10 (visual score) and lasted for 72 hours. Rescue drugs on demand were oral paracetamol or dipyrone. RESULTS: The patients in the DM60 and DM90 groups similarly experienced 50-80% less pain (P < 0.01) compared with patients in the placebo group, both immediately and up to 3 days postoperatively, as well as a 50% reduction in the estimated overall maximal pain intensity (P < 0.01). Both DM groups consumed 50-70% less MO than the nonmedicated individuals in the placebo group (P < 0.01), and their demand for rescue drugs on the first postoperative day also was significantly lower (P < 0.01). Patients in the DM groups also were sedated less ( approximately 70%; P < 0.01). There were no differences among the groups in terms of when the patients left their beds, when they were discharged home, or the number of overall side effects. CONCLUSIONS: DM is associated with reduced pain intensity, sedation, and analgesic requirements, even in patients undergoing surgery for bone and soft tissue malignancies. A 3-day DM administration neither increased the incidence of side effects nor accelerated ambulation and discharge home. 相似文献
6.
Weinbroum AA 《Journal of cardiovascular pharmacology》2005,45(6):509-515
Liver ischemia and subsequent reperfusion (IR) are associated with secondary, remote organ reperfusion injury attributable to oxidative stress mediators. Because N-acetyl-L-cysteine (NAC) was effective in attenuating lung reperfusion injury, its properties on aortic dysfunction were tested. Rat isolated perfused aortic rings (n = 8/group) were evaluated during and after exposure to liver postischemia perfusate. Aortic response to phenylephrine under these conditions was also assessed in the presence or absence of increasing concentrations of NAC. Aortic rings incubated with postischemia perfusates exhibited abnormally protracted contraction. Their response to phenylephrine was reduced to 18 +/- 7% and 65 +/- 11% of controls during and after the exposure, respectively, and their subsequent relaxation was irregular. NAC 0.25 mM best attenuated the IR-induced aortic tone impairments, 0.12 mM affected it slightly, and IR-NAC 0.5 mM and IR-NAC 0.74 mM solutions dilated the rings proportionately, abolishing reactions to both IR solutions and phenylephrine. Xanthine oxidase activity and reduced glutathione (GSH) level in all IR ring tissues were inversely proportionate, but not directly so. Thus, liver IR impaired aortic tone and its response to phenylephrine, even after removal of toxic elements. NAC concentrations directly and inversely correlated with xanthine oxidase activity but not with GSH level. It preserved aortic functions dose-specifically, mainly by oxidant quenching. 相似文献
7.
Kollender Y Bender B Weinbroum AA Nirkin A Meller I Bickels J 《The Journal of arthroplasty》2004,19(3):354-360
Competence of the extensor mechanism is the major determinant of functional outcome of patients after proximal tibia resection. A method of secondary reconstruction of the extensor mechanism using the middle third of the quadriceps tendon and the patellar retinaculum augmented with Gore-Tex strips and gastrocnemius flap is described. Between 1981 and 1997, 7 patients with extension lag greater than 20 degrees at least 1 year after the initial surgery underwent secondary reconstruction of the extensor mechanism. All patients were followed up for a minimum of 2 years. Full extension to an extension lag of 10 degrees was achieved in three patients, and an extension lag between 10 degrees and 20 degrees was achieved in 4 patients. All patients had good to excellent functional outcomes and reported no limitations in daily life activities. 相似文献
8.
BACKGROUND: The need to control high costs of running operating rooms while providing for timely patient care led us to assess the time wasted in the operating room (OR). METHODS: OR use by two general surgery and two orthopedic departments in a metropolitan public hospital were analyzed, and the time elapsed when a scheduled OR remained unused or the patient was still awaiting surgery was measured. RESULTS: OR "time-waste" defined as the time in which the scheduled OR was not busy with the scheduled patient amounted to 79 hours over the 30-day study period (15% of total time). It was wasted owing to inappropriately prepared patients (12%), unavailability of surgeons (7%), insufficient nursing staff, anesthesiologists, or OR assignment to emergency surgery (59%), congestion of the postanesthesia care unit (10%), and delay in transport to the OR (2%) Another issue delineated was the frequent occurrence of surgical cases running longer than their scheduled time (termed "spill-over"), outrunning the staffing expectations after 3:00 PM and delaying admission of add-on and emergency procedures, adding 33% to the time wasted. A quality-assurance committee review resulted in implementation of new guidelines, and within 3 months several underlying causes were rectified, and time-waste and spill over time was reduced by 35%. Surgical time predictions were also improved. Shortage of nurses and anesthesiologists, and OR emergency reassignment remained the major causes of OR waste time. CONCLUSIONS: Continuous surveillance on OR suite-patients' prompt care, repeated evaluation, and wise staff deployment-could maximize OR efficiency. 相似文献
9.
BACKGROUND AND OBJECTIVE: Midazolam may occasionally precipitate hostility and violence instead of tranquility. We characterized these episodes, their rate of occurrence, the potential paradoxical responders and possible predisposing circumstances among patients undergoing lower body surgery under spinal or epidural anaesthesia and midazolam sedation. PATIENTS AND METHODS: Fifty-eight patients who fulfilled the study entry criteria and who underwent surgery within a 3-month period in a large metropolitan, university-affiliated hospital were enrolled. Sedation and restlessness in all patients were controlled by midazolam administered intravenously by the attending anaesthesiologist; these parameters were later objectively confirmed by recorded actigrams. If "paradoxical" events occurred, flumazenil 0.1 mg 10 s-1 was injected until the aberrant behaviour ceased. Patients with paradoxical reactions were later compared with matched control patients selected from the study group to identify epidemiological characteristics. RESULTS: The incidence of paradoxical events was 10.2% (six out of 58 patients, confidence limits 2.3-18.3%) and they occurred 45-210 min after sedation started; the only independent predictor was an age older than that of the entire study group. The mean cumulative and per weight doses of midazolam were similar for both the experimental and the study groups of patients: 7.3 +/- 2.8 to 10.1 +/- 3.6 mg, and 0.1 +/- 0.04 to 0.12 +/- 0.05 mg kg-1. Flumazenil 0.2-0.3 mg (range 0.1-0.5 mg) effectively stopped the midazolam-induced paradoxical activity within 30 s and surgery continued uneventfully. CONCLUSIONS: Flumazenil completely reverses midazolam-induced paradoxical reactions and they are more frequent in older patients. 相似文献
10.
1. Systemic hypotension, blunted cardiovascular responsiveness to noradrenaline and an abnormal hypertensive pressor response to a postural change have been described in cirrhotic patients. 2. We have examined the role of blunted responsiveness in these abnormalities by studying basal arterial blood pressure and its response to a postural change (vertical head-up 90 degrees tilting) in conscious and pithed CCl4-treated (cirrhotic) rats, as well as assessing the pressor response to noradrenaline in vivo and the vascular contractile response to noradrenaline in vitro. 3. A diminished hypotensive response to a change in posture was found in pre-cirrhotic portal hypertensive rats, whereas an inverted hypertensive pressor response in the face of systemic hypotension occurred in the cirrhotic rats with portal hypertension. 4. The inverted pressor response was abolished in the pithed portal hypertensive cirrhotic rats. 5. The pressor response to noradrenaline in vivo in conscious cirrhotic rats and the vascular contractile responsiveness to noradrenaline in vitro were intact. 6. We conclude that blunted responsiveness to noradrenaline is not a contributory factor to the development of systemic hypotension or the inverted pressor response to a change in posture in cirrhosis. 相似文献