Abstract:
BACKGROUND:Mechanosensory thalamocortical relay neurones (TCNs) receive glutamatergic excitatory input and are subjected to gamma-aminobutyric acid (GABA)Aergic inhibitory input. This study assessed the effects of an increase in concentration of isoflurane on thalamic excitatory and inhibitory mechanisms. METHODS:TCNs (n = 15) of the thalamic ventral posteromedial nucleus responding to mechanical stimulation of whiskers were investigated in rats anaesthetized with end-tidal concentrations of isoflurane of approximately 0.9% (ISOlow, baseline) and approximately 1.9% (ISOhigh). Response activity induced by controlled vibratory movement of single whiskers was recorded before, during and after iontophoretic administration of the GABAA receptor antagonist bicuculline to the vicinity of the recorded neurone. RESULTS:The increase in concentration of isoflurane induced a suppression of vibratory responses to 14 (4)% [mean (SEM)] of baseline activity. Blockade of GABAA receptors by bicuculline during ISOlow and ISOhigh caused increases in response activity to 259 (32)% and 116 (25)% of baseline activity, respectively. The increase in isoflurane concentration enhanced overall inhibitory inputs by 102 (38)%, whilst overall excitatory inputs were reduced by 54 (7)%. CONCLUSIONS:These data suggest that doubling the concentration of isoflurane doubles the strength of GABAAergic inhibition and decreases the excitatory drive of TCNs by approximately 50%. The isoflurane-induced enhancement of GABAAergic inhibition led to a blockade of thalamocortical information transfer which was not accomplished by the effects of isoflurane on glutamatergic synaptic transmission alone. Thus, it appears that, with respect to transmission of information in the thalamus, the most prominent action of isoflurane is an enhancement of GABAAergic synpatic inhibition, and that effects on glutamatergic neurotransmission may contribute to a lesser extent.
journal_name
Br J Anaesthjournal_title
British journal of anaesthesiaauthors
Detsch O,Kochs E,Siemers M,Bromm B,Vahle-Hinz Cdoi
10.1093/bja/aef170subject
Has Abstractpub_date
2002-08-01 00:00:00pages
294-300issue
2eissn
0007-0912issn
1471-6771pii
S0007-0912(17)37109-Xjournal_volume
89pub_type
杂志文章abstract::Raised intracranial pressure (ICP) and low cerebral blood flow (CBF) are associated with ischaemia and poor outcome after brain injury. Therefore, many management protocols target these parameters. This overview summarizes the technical aspects of ICP and CBF monitoring, and their role in the clinical management of br...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,评审
doi:10.1093/bja/ael110
更新日期:2006-07-01 00:00:00
abstract:BACKGROUND:Multi-injection targeted intracluster injection ultrasound-guided supraclavicular brachial plexus block has been advocated to provide a faster onset of anaesthesia compared with a double injection technique. By placing the needle within clusters of hypoechoic structures, corresponding to neural tissue, this ...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1016/j.bja.2019.01.006
更新日期:2019-06-01 00:00:00
abstract::Sleep disordered breathing is a common problem affecting all age groups, particularly in association with certain other medical conditions and syndromes. The pathological consequences of the disorder may be severe, with significant implications for the perioperative management of sufferers. Research into the effects o...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,评审
doi:10.1093/bja/86.2.254
更新日期:2001-02-01 00:00:00
abstract::The interaction of three new non-depolarizing neuromuscular blocking agents--atracurium, vecuronium and Duador--on human red cell acetylcholinesterase (AChE; EC 3.1.1.7) and human plasma butyrylcholinesterase (BuChE; EC 3.1.1.8) was investigated. The binding of these neuromuscular blockers to human plasma proteins (pr...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:
更新日期:1983-01-01 00:00:00
abstract::We have assessed tracheal intubating conditions in 60 ASA I or II patients after induction of anaesthesia with propofol 2.5 mg kg-1 and alfentanil 10 or 20 micrograms kg-1 with or without i.v. lignocaine 1 mg kg-1. No neuromuscular blocking agents were administered. Patients were allocated randomly to four groups: gro...
journal_title:British journal of anaesthesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/bja/70.2.163
更新日期:1993-02-01 00:00:00
abstract::The clinical understanding of the dynamics of myocardial contraction is hampered by an over-simplified interpretation of the intramural pattern of force generation. This limits the anaesthetist's knowledge of the direct effects of commonly used anaesthetics. A discrimination between a negative inotropic effect and cha...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,评审
doi:10.1093/bja/60.suppl_1.2s
更新日期:1988-01-01 00:00:00
abstract::We have investigated the effects of 9.5% and 14.1% MAC concentrations of isoflurane on some psychometric measurements. Both concentrations depressed peak saccadic velocity (P < 0.01), choice reaction time (P < 0.05) and visual analogue scores for sedation (P < 0.05), but not the critical flicker fusion threshold. The ...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/71.6.839
更新日期:1993-12-01 00:00:00
abstract:BACKGROUND:Short-axis ultrasound-guided placement of central venous catheters (CVCs) is widely accepted as safe practice. However, utilizing the long-axis approach could further improve safety, as it allows for better visualization of the needle as it is advanced to the target vessel. However, the long-axis approach ha...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,随机对照试验
doi:10.1093/bja/aer329
更新日期:2012-01-01 00:00:00
abstract::During resection of a Wilms' tumour in a 10-year-old girl, sudden bradycardia, hypotension and cyanosis developed, leading to cardiac arrest. It was thought that part of the tumour had caused a pulmonary embolus. After prompt resuscitation, cardiopulmonary bypass surgery was started within 20 min. At operation the lef...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/53.8.903
更新日期:1981-08-01 00:00:00
abstract:BACKGROUND:The second gas effect (SGE) is considered to be significant only during periods of large volume N(2)O uptake (VN(2)O); however, the SGE of small VN(2)O has not been studied. We hypothesized that the SGE of N(2)O on sevoflurane would become less pronounced when sevoflurane administration is started 60 min aft...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,随机对照试验
doi:10.1093/bja/ael008
更新日期:2006-03-01 00:00:00
abstract::Using in vivo microdialysis, we have investigated the effects of propofol on acetylcholine (ACh) release from various regions of the rat brain. Propofol 25 and 50 mg kg-1 i.p. decreased basal ACh release from the frontal cortex by 70% and 85%, respectively. Propofol 25 and 50 mg kg-1 i.p. decreased basal ACh release f...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/80.5.644
更新日期:1998-05-01 00:00:00
abstract::We have investigated the incidence of regurgitation of gastric contents during general anaesthesia administered via a laryngeal mask airway (LMA) or face mask and Guedel airway in 56 patients with no risk factors for regurgitation. Patients swallowed a gelatin capsule containing methylene blue 10 min before induction ...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/69.3.314
更新日期:1992-09-01 00:00:00
abstract:BACKGROUND:Desflurane at more than 1 minimum alveolar concentration (MAC) has been shown to prolong the QT interval, but it is unclear whether this is the case at lower concentrations. The aim of this study was to determine whether desflurane concentrations of <1 MAC affect tracheal intubation-induced prolongation of t...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,随机对照试验
doi:10.1093/bja/aep355
更新日期:2010-02-01 00:00:00
abstract:BACKGROUND:Cardiac output (CO) monitoring by uncalibrated arterial pressure waveform analysis (APCO) using the FloTrac/Vigileo™ is feasible in patients with intracranial haemorrhage, but the results of validation studies are contradictory. The aim of the present study was to analyse the clinical agreement between the i...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/aer170
更新日期:2011-10-01 00:00:00
abstract:INTRODUCTION:Compared with term neonates, preterm babies are more likely to die from sepsis. However, the combined effects of sepsis and prematurity on neonatal postoperative mortality are largely unknown. Our objective was to quantify the proportion of neonatal postoperative mortality that is attributable to the syner...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,多中心研究
doi:10.1016/j.bja.2020.07.026
更新日期:2020-12-01 00:00:00
abstract::The water soluble benzodiazepine midazolam was compared with diazepam, in doses of 0.07 mg kg-1 and 0.15 mg kg-1 respectively, administered i.v. to 100 patients undergoing gastroscopy. The degree of sedation, ease of endoscopy and recovery were comparable in the two groups. The effects of both drugs on arterial pressu...
journal_title:British journal of anaesthesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/bja/55.8.773
更新日期:1983-08-01 00:00:00
abstract::We have studied the effect of analgesia on maternal temperature (oral and tympanic membrane) progression in 53 women during normal spontaneous labour. Three groups were studied: two received extradural analgesia with a continuous infusion of 0.25% bupivacaine with or without the addition of fentanyl; the third group r...
journal_title:British journal of anaesthesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/bja/67.5.565
更新日期:1991-11-01 00:00:00
abstract::Human plasma cholinesterase (E.C. 3.1.1.8) was shown to be inhibited by physiological concentrations of propanidid and suxamethonium using a colourimetric assay at 25 degrees C and pH 7.2 unit with butyrylthiocholine as substrate. Propanidid inhibited the enzyme in a non-competitive manner (I50 = 2.0 mmol litre-1; app...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/51.3.181
更新日期:1979-03-01 00:00:00
abstract::We report the extradural administration of low-dose morphine in 10 ml of 10% dextrose (2-3 mg) to 98 adult patients with various types of acute and chronic pain. Extradural morphine injections were given either via a Tuohy needle (single or repeat injection) or via an extradural catheter. Pain relief was evaluated by ...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/52.3.247
更新日期:1980-03-01 00:00:00
abstract::Arterial blood and expired gas samples were taken from 20 patients before operation and on the first day after upper abdominal surgery. After operation the patients were studied breathing air and also breathing 35% oxygen from a venturi-type mask. Preoperative Pao2 with age was exaggerated by operation. Pao2 after ope...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/47.4.491
更新日期:1975-04-01 00:00:00
abstract::We have studied the effects of amrinone on left and right ventricular haemodynamics in patients with impaired ventricular performance caused by coronary artery disease. Anaesthesia was achieved with fentanyl, flunitrazepam and pancuronium. After reaching steady state, a bolus dose of amrinone 0.5 mg kg-1 was administe...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/72.5.567
更新日期:1994-05-01 00:00:00
abstract::Cobra venom consists of a neurotoxin which is responsible for respiratory paralysis simulating that associated with a non-depolarizing muscle relaxant. A combination of artificial respiration and neostigmine has been useful in resuscitating a child bitten by a snake. ...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/49.10.1065
更新日期:1977-10-01 00:00:00
abstract:BACKGROUND:Transtracheal jet ventilation (TTJV) is recommended in several airway guidelines as a potentially life-saving procedure during the 'Can't Intubate Can't Oxygenate' (CICO) emergency. Some studies have questioned its effectiveness. METHODS:Our goal was to determine the complication rates of TTJV in the CICO e...
journal_title:British journal of anaesthesia
pub_type: 杂志文章,评审
doi:10.1093/bja/aew192
更新日期:2016-09-01 00:00:00
abstract::We studied the effects of minor surgery and endotracheal intubation on postoperative breathing patterns. We measured breathing patterns and laryngeal resistance during the periods immediately before intubation (preoperative) and immediately after extubation following minor surgery (postoperative) in eight patients ana...
journal_title:British journal of anaesthesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/bja/87.5.706
更新日期:2001-11-01 00:00:00
abstract::We have compared the effects of the anaesthetic gases nitrogen and argon on adenosine diphosphate (ADP)-induced human blood platelet aggregation with the effects of the non-anaesthetic gas helium. All three gases showed dose-dependent inhibition of platelet aggregation. For nitrogen and argon there was a linear relati...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/64.1.77
更新日期:1990-01-01 00:00:00
abstract:BACKGROUND:A multidisciplinary approach to improve postoperative outcomes in frail elderly patients is gaining interest. Multidisciplinary team care should be targeted at complex patients at high risk for adverse postoperative outcome to limit the strain on available resources and to prevent an unnecessary increase in ...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1016/j.bja.2019.12.042
更新日期:2020-02-14 00:00:00
abstract:BACKGROUND:Ketamine is used as an anaesthetic agent for short surgical procedures, and as a sedative and analgesic in intensive care patients. Intensive care patients with brain or spinal cord injury may have physiological changes that could alter the pharmacokinetics of ketamine. The pharmacokinetics of ketamine have ...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/aeg028
更新日期:2003-02-01 00:00:00
abstract::The effect of the topical application of a lignocaine-prilocaine cream (EMLA) on the pain of venous cannulation was tested in a double-blind manner. Sixty boys and girls between the ages of 4 and 10 yr who were to undergo surgery participated in the study. No analgesic premedication was given and the venous cannulatio...
journal_title:British journal of anaesthesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/bja/58.11.1242
更新日期:1986-11-01 00:00:00
abstract:BACKGROUND:The esCCO monitor (ECG- estimated Continuous Cardiac Output, Nihon Kohden(®)) is a new non-invasive tool for estimating cardiac output (CO). It derives CO from the pulse wave transit time (PWTT) estimated by the ECG and the plethysmographic wave. An initial calibration is needed to refine the relation linkin...
journal_title:British journal of anaesthesia
pub_type: 杂志文章
doi:10.1093/bja/aes298
更新日期:2012-12-01 00:00:00
abstract::We conducted a prospective, randomized, double-blind study to compare analgesia obtained by wound infiltration using 29 ml of 0.25% bupivacaine alone, or with the addition of clonidine hydrochloride 150 micrograms. A third group received bupivacaine wound infiltration with clonidine 150 micrograms i.m. to control for ...
journal_title:British journal of anaesthesia
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1093/bja/79.4.446
更新日期:1997-10-01 00:00:00