The population of reserve alpha-2 adrenoceptors that mediate the inhibitory effect of clonidine on the activity of locus coeruleus neurons has been studied using extracellular recordings in anesthetized rats. Animals were pretreated with the irreversible receptor antagonist N-ethoxycarbonyl-2-ethoxy-1-2-dihydroquinoline (EEDQ). In rats pretreated with EEDQ (1, 2 and 6 mg/kg, i.p., 6 hr before e...

BACKGROUND The antihypertensive drug clonidine is a centrally acting alpha2 agonist useful as a premedicant because of its sedative, anxiolytic, and analgesic properties. We examined the effect of clonidine given as an oral preanesthetic medication in producing a bloodless surgical field in patients undergoing middle ear microsurgery. We also evaluated whether the administration of clonidine wo...

AIMS The clinical effectiveness of buprenorphine-naloxone (bup-nx) and clonidine for opioid detoxification in in-patient and out-patient community treatment programs was investigated in the first studies of the National Institute of Drug Abuse Clinical Trials Network. DESIGN Diagnostic and Statistical Manual version IV (DSM IV)-diagnosed opioid-dependent individuals seeking short-term treatme...

Sesoko, Shogo, Hiromi Muratani, Masanobu Yamazato, Hiroshi Teruya, Shuichi Takishita, and Koshiro Fukiyama. Contribution of a2-adrenoceptors in caudal ventrolateral medulla to cardiovascular regulation in rat. Am. J. Physiol. 274 (Regulatory Integrative Comp. Physiol. 43): R1119–R1124, 1998.—The inhibitory action of a2agonists on the cardiovascular neurons has been elucidated in the rostral ven...

The neuropil surrounding sympathetic preganglionic neurons (SPNs) receives an abundant catecholaminergic innervation originating from the brain stem. The effect of catecholamines (CA) released at this spinal level on the activity of SPNs is still controversial as is the extent to which this particular CA transmission is affected by central antihypertensive drugs, such as clonidine and alpha-met...

Spinal administration of opioid and α2-adrenergic receptor (α2AR) agonists produces analgesia, and agonists interact synergistically when coadministered. The molecular mechanism underlying this synergy is largely unknown. Pharmacological studies have identified both the delta and the mu-opioid receptors (DOR and MOR) as candidate receptors capable of interacting synergistically with α2AR agonis...

An agonist at a specific G protein-coupled receptor may exhibit a range of efficacies for any given response in a cell-specific manner. We report that the relationship between different states of agonism is regulated by the type of G protein expressed in the cell. In NIH-3T3 alpha(2)-adrenergic receptor (AR) transfectants, the alpha(2)-AR agonists clonidine, oxymetazoline, UK-14304, and epineph...

UNLABELLED This study evaluated the effect of oral low dose clonidine premedication on postoperative pain and hemodynamic status of the patients during abdominal hysterectomy under general anesthesia. METHODS This study is a randomized, placebo controlled double-blinded clinical trial. After approval of the study protocol by the Ethics Committee 60 patients were recruited and written informed...

background opium is a highly addictive agent and the most common narcotic often misused in iran. the pharmacokinetic of anesthetic drugs in patients with opium addiction is one of the great challenges for anesthesiologists. hemodynamic instability and postoperative side effects are of these challenges which should be managed correctly. objectives in this study we aimed to assess the effects of ...

INTRODUCTION Post-operative agitation (PA) is a common problem (20-70%) in children anaesthetised with sevoflur-ane. Clonidine is widely used off-label in children for several indications, including PA, but the current level of evidence is limited. Our aim is to investigate the impact of prophylactic intravenous (IV) clonidine administered at the end of surgery on the incidence and degree of PA...