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PubMed1988

Large doses of vecuronium and plasma histamine concentrations.

The authors studied 20 surgical patients to determine the effect of large doses of vecuronium on plasma histamine concentrations. Patients were unpremedicated and anaesthetized with nitrous oxide and halothane via a mask. Tracheal intubation was performed without the use of muscle relaxants. Fifteen min later and before surgery had begun, vecuronium, in doses of 0.1 and 0.2 mg.kg-1 (n = 10 for each dose), was administered as an IV bolus. Arterial blood samples were obtained prior to and 2, 5, and 10 min after vecuronium administration and analyzed for plasma histamine by a radioenzymatic method. Arterial blood pressure and heart rate were measured continuously. In one patient who received 0.1 mg.kg-1 of vecuronium, plasma histamine concentrations at 2 min were 275 per cent of the control histamine value but fell below control at 10 min. This increase in plasma histamine was not associated with clinically important changes in blood pressure or heart rate. As a group, study patients had no significant changes in plasma histamine concentrations with either dose of vecuronium. In addition, mean plasma histamine values for each sampling interval did not differ between the two patient groups. Mean arterial blood pressure (MAP) decreased significantly at 10 min in patients receiving vecuronium 0.1 mg.kg-1, and at 2 and 10 min in patients receiving 0.2 mg.kg-1 of vecuronium. However, these decreases in MAP were not clinically important. Changes in plasma histamine concentrations did not correlate with corresponding changes in MAP. Heart rate did not change significantly in any patient during the study.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1989

Does vecuronium accumulate in the renal transplant patient?

Twenty ASA physical status Class III patients undergoing cadaver renal transplantation were studied. After 90 per cent T1 recovery, as determined by train-of-four measurement, from 1.0 mg.kg-1 succinylcholine to facilitate tracheal intubation, nine patients received atracurium 0.25 mg.kg-1 (Group I) and 11 patients received vecuronium 0.05 mg.kg-1 (Group II) intravenously. The following measurements were made: time to maximum block onset (first dose Max), injection to start of recovery (start REC1), injection to 25 per cent T1 twitch recovery (REC 251), injection to 75 per cent T1 (REC 75(1], injection to 90 per cent T1 (REC 90(1] and time from 25-75 per cent recovery T1 (REC 25-75(1]. Maximum blockade (Max block 1) was also measured. At 90 per cent T1 recovery, if time permitted, an identical dose of the appropriate relaxant was administered. Time from second dose to onset of maximum block (second dose Max) and 90 per cent recovery after second dose (REC 90(2] were then measured. At the conclusion of surgery, neuromuscular blockade was reversed with neostigmine 2.5 mg and glycopyrrolate 0.5 mg. One way ANOVA was performed to determine significance between the groups and a p less than 0.05 was considered significant. A paired t test was also performed between REC 90(1) and REC 90(2) for atracurium and vecuronium respectively. A p less than 0.05 was again considered significant. Measurement of first dose Max, start REC1, REC25(1), REC 75(1), REC 90(1), REC 25-75(1) and Max block 1 revealed no difference between the patients receiving an initial dose of atracurium and those receiving vecuronium.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1994

Neuromuscular effects of vecuronium and neostigmine in Montreal and Paris.

The potency of vecuronium was reported to be greater in Montréal than in Paris. This study was designed to determine whether there were differences in onset, duration, and reversibility with neostigmine between both centres. Twenty ASA I or II adults (ten men, ten women), aged 18-65 yr were studied in each of the two cities, during a standard thiopentone-fentanyl-nitrous oxide (60-70%) - isoflurane 0.5% end-tidal anaesthetic. Train-of-four stimulation was applied every 20 sec to the ulnar nerve at the wrist and the force of contraction of the adductor pollicis muscle was measured. Vecuronium, 0.1 mg.kg-1, was given as a bolus, and neostigmine, 0.04 mg.kg-1, was administered, with atropine 0.02 mg.kg-1, at 25% first twitch height recovery. Onset time to maximum blockade was (mean +/- SD) 3.9 +/- 1.3 min in Paris vs 4.5 +/- 1.3 min in Montréal (NS). Duration from injection to 25% first twitch recovery was shorter (28.5 +/- 6.8 min) in Paris than in Montréal (39.1 +/- 7.3 min) (P < 0.0001). Time from injection of neostigmine to a train-of-four ratio of 70% was not different in Paris (6.3 +/- 2.2 min) from Montréal (5.6 +/- 1.9 min). It is concluded that the duration of an "intubating" dose of vecuronium is longer in Montréal, but, when given at 25% first twitch recovery, neostigmine has the same efficacy in Montréal as in Paris.

Adolescent↗
PubMed1995

Oral clonidine premedication reduces vomiting in children after strabismus surgery.

This is a prospective randomized double-blind trial conducted to determine whether preoperative orally administered clonidine causes or potentiates postoperative vomiting in 140 children (3-12 yr) undergoing strabismus surgery. They were all inpatients and classified randomly into four groups (n = 35 each); placebo (control), diazepam 0.4 mg.kg-1, clonidine 2 micrograms.kg-1, and clonidine 4 micrograms.kg-1. These agents were administered 93-112 min (mean; 100 min) before the anticipated time of induction of anaesthesia. All children received inhalational anaesthesia with halothane and nitrous oxide in oxygen. Muscle relaxation in all patients was obtained with vecuronium and residual neuromuscular blockade was antagonized with neostigmine and atropine before tracheal extubation. Diclofenac suppository was prescribed to prevent postoperative pain. No opioids or postoperative antiemetics were administered. All children remained in hospital for two days postoperatively. The incidence and frequency of vomiting were compared in the groups with Kruskall-Wallis Rank test. Clonidine 4 micrograms.kg-1 caused a lower incidence and frequency of vomiting than did placebo and diazepam (incidence and frequency: 11% and 1.37% and 3, and 34% and 2 in clonidine 4 micrograms.kg-1, placebo, and diazepam, respectively; P < 0.05 for clonidine 4 micrograms.kg-1 vs placebo and diazepam). However, low-dose clonidine was ineffective. These data suggest that preanaesthetic medication with clonidine 4 micrograms.kg-1 may be useful for preventing emesis following strabismus surgery. This property of clonidine indicates that it may be superior to other sedative premedicants such as diazepam and midazolam.

Administration, Oral↗
PubMed1995

Optimal stimulating current for train-of-four stimulation in conscious subjects.

The purpose of this study was to determine the optimal stimulating current for train-of-four (TOF) monitoring with regard to the return of TOF response and the discomfort associated with TOF. Two variables were examined at 60, 50, 40, 30, and 20 mA: (1) times from administration of vecuronium 80 micrograms.kg-1 to returns of responses to TOF determined accelographically in 75 anaesthetised patients and (2) discomfort associated with TOF in 15 awake volunteers using visual analogue scale (VAS). Times to return of the first response to stimulation at 60, 50, 40, and 30 mA were not different (29.1 +/- 11.2, 30.1 +/- 12.0, 31.9 +/- 12.6, and 35.4 +/- 14.2 min, respectively, mean +/- SD). However, time to the return of the first response elicited at 20 mA (53.7 +/- 21.6) was longer than at higher currents (P < 0.05). Similarly, with regard to the second, third, and fourth responses, the time to the return at 20 mA was longer than at the other currents (P < 0.05). The VAS associated with TOF at 60, 50, 40, 30, and 20 mA were 7.3 +/- 1.9, 6.7 +/- 1.8, 6.0 +/- 2.0, 4.1 +/- 2.1, and 2.7 +/- 2.3, respectively. The VAS at 30 mA was less than at 60 and 50 mA (P < 0.05), and at 20 mA was less than at 60, 50, and 40 mA (P < 0.05). In conclusion it is suggested that, when testing conscious patients, 30 mA is the optimal stimulating current for TOF monitoring because it represents the best compromise of neuromuscular monitoring and patient discomfort.

Adult↗
PubMed1995

The triple airway manoeuvre for insertion of the laryngeal mask airway in paralyzed patients.

The efficacy of the triple airway manoeuvre (mouth opening, head extension and jaw thrust) for insertion of the laryngeal mask airway (LMA) was compared with the standard insertion method. One hundred paralyzed patients were allocated randomly into two groups: in the control group (n = 50) the LMA was inserted by the standard method, and in the other (TAM group, n = 50) by the triple airway manoeuvre. In ten patients of each group, the position of the LMA and the epiglottis was assessed radiographically before insertion, after insertion but before cuff inflation, and after cuff inflation. In all patients the position was examined using fibrescopy before and after cuff inflation. The mean distance between the epiglottis and the posterior pharyngeal wall, measured radiographically before LMA insertion, was greater in the TAM group (16.3 (SD 4.3) mm) than in the control group (7.0 (2.8) mm) (P < 0.001). Before cuff inflation, radiography and fibrescopy showed that the LMA compressed the epiglottis downwards more frequently in the control group. After cuff inflation the glottis was completely visible fibreoptically in 66% in the TAM group, compared with 14% in the control group (P < 0.001). Complete downfolding of the epiglottis was seen in 10% in the control group and none in the TAM group (P < 0.05). We conclude that in paralyzed patients LMA insertion with the triple airway manoeuvre provides wider pharyngeal space and decreases the incidence of epiglottic downfolding by the LMA compared with the standard method.

Adult↗
PubMed1994

Succinylcholine.

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Adolescent↗
PubMed1994

Age and the onset of desaturation in apnoeic children.

Most patients undergoing general anaesthesia are apnoeic during laryngoscopy and tracheal intubation. This study determined the time until the onset of desaturation following pre-oxygenation in apnoeic infants, children, and adolescents. Fifty ASA physical status I patients, 2 days to 18 yr of age, were studied. The patients were stratified into one of five groups according to age: Group I, 0-6 mo; Group II, 7-23 mo; Group III, 2-5 yr; Group IV, 6-10 yr; and Group V, 11-18 yr. Following induction of anaesthesia with halothane via mask or intravenous barbiturates, the ability of the anaesthetist to ventilate the lungs via the mask was ascertained and paralysis was accomplished with vecuronium 0.1 mg.kg-1. Manual mask ventilation was maintained with oxygen and halothane. When end-tidal N2 decreased below 3% (minimum time two minutes), the face mask was removed. The time between the removal of the face mask and a decrease in oxygen saturation (SpO2) from 99-100% to 90% was measured. Manual ventilation was then resumed and the trachea intubated. Desaturation started earlier in infants than in two- to five-year-old children (96.5 +/- 12.7 sec vs 160.4 +/- 30.7 sec, P < 0.0001). Children became desaturated faster than adolescents (160.4 +/- 30.7 vs 382.4 +/- 79.9 sec, P < 0.0001). The time required to reach 90% saturation correlated well with age by linear regression analysis (r2 = 0.88, P < 0.0001). We conclude that the time to onset of desaturation following pre-oxygenation with mask ventilation increases with age in healthy apnoeic children.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1995

Oral clonidine does not alter vecuronium neuromuscular blockade in anaesthetized patients.

Since clonidine, an alpha 2-agonist, inhibits the release of norepinephrine or acetylcholine which can decrease nondepolarizing muscle relaxant-induced neuromuscular blockade, the authors examined whether clonidine given as an oral preanaesthetic medication would alter the onset, duration or recovery of a vecuronium neuromuscular blockade in lightly anaesthetized patients. Thirty-eight patients (aged 20-73 yr) randomly received oral clonidine either approximately 5 micrograms.kg-1 (n = 21) or none (n = 17), 90 min before arrival in the operating room. We measured acceleration of thumb contraction with ulnar nerve stimulation at the wrist to assess neuromuscular blockade. The onset time (the time from injection to decrease to 5% of baseline twitch height), duration (the time interval between injection and return of the first twitch to 25% of the baseline value), and recovery index (the time interval of the first twitch from 25% to 75% of the baseline value) of neuromuscular blockade from a single bolus of vecuronium 0.1 mg.kg-1 i.v. were determined and compared between the clonidine-treated and control patients during lower abdominal or extremity surgery under epidural plus general anaesthesia with fentanyl and nitrous oxide in oxygen. No differences were noted between the control and clonidine groups in onset time (100 +/- 6 sec (mean +/- SE) vs 101 +/- 6 sec), duration (44.5 +/- 2.7 min vs 42.9 +/- 2.7 min), or recovery index (21.6 +/- 2.8 min vs 19.1 +/- 1.9 min) of neuromuscular blockade from vecuronium, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

Administration, Oral↗
PubMed1996

Early neuromuscular recovery characteristics following administration of mivacurium plus vecuronium.

PURPOSE: This study was designed to describe the early recovery characteristics, as well as the speed of onset of neuromuscular block, after a combination of mivacurium and vecuronium. METHODS: In this controlled, randomized study, 30 consenting ASA I-III patients were assigned to three treatment groups. The "2M2V" group received twice the dose necessary to cause 95% depression of the evoked twitch response (2 x ED95) of mivacurium (0.15 mg.kg-1) plus 2 x ED95 of vecuronium (0.1 mg.kg-1); the "2V" group received 2 x ED95 of vecuronium; and the "4V" group received 4 x ED95 of vecuronium. Evoked neuromuscular responses of the adductor pollicis were assessed with an adductor pollicis force transducer. The time until maximum block and times to 10% and 25% recovery (T10 and T25) in each group were expressed as mean +/- standard deviation and compared using ANOVA. RESULTS: Onset of block in the 2M2V group was 27% faster than in the 2V group (2.0 +/- 0.6 vs. 2.7 +/- 0.8 min respectively, P < 0.05) and was similar to the 4V group (1.95 +/- 0.3 min, P = NS). The times until 10% recovery were similar in the 2M2V and 4V groups (59.9 +/- 12 vs 68.2 +/- 25 min, P = NS) and were slower than in the 2V groups (37.2 +/- 9 min, P < 0.05). Between T10 and T25 recovery after 2M2V resembled that after 2V (6.7 +/- 3 vs 5.7 +/- 1 min, P = NS) and was faster than after 4V (10.9 +/- 7 min, P < 0.05). CONCLUSIONS: When 2 x ED95 of mivacurium is added to 2 x ED95 of an intermediate or long-acting relaxant, recovery after T10 will proceed as if one had administered the longer-acting agent alone.

Humans↗
PubMed1996

Recovery of post-tetanic and train-of-four responses at the first dorsal interosseous and adductor pollicis muscles in patients receiving vecuronium.

PURPOSE: To compare recovery of accelographical responses to post-tetanic twitch (PTT) and train-of-four (TOF) stimuli obtained at the first dorsal interosseous muscle (DI) with those at the adductor pollicis muscle (AP) after administration of vecuronium 70 micrograms.kg-1. METHODS: Sixty adult patients were randomly assigned to one of four groups: PTT-DI (n = 15), PTT-AP (n = 15), TOF-DI (n = 15), or TOF-AP (n = 15) group. In PTT-DI and PTT-AP groups, responses to PTT were measured accelographically at the DI and at the AP, respectively. In TOF-DI and TOF-AP groups, responses to TOF were measured at the DI and at the AP, respectively. RESULTS: The T1/T0 (T0 = control) was greater in the TOF-DI than in TOF-AP group throughout recovery (P < 0.05), and the T4/T1 was greater in the TOF-DI than in TOF-AP group during the 30-40 min after vecuronium injection (P < 0.05). Time to the return of the first response to PTT (post-tetanic count(1), PTC1) was less in the PTT-DI than in the PTT-AP group (17.7 +/- 4.2 vs 21.7 +/- 5.6 min, mean +/- SD, P = 0.0341). The post-tetanic count PTC (number of single twitch stimuli in response to PTT) was greater in the PTT-DI than in the PTT-AP group during the 10-30 min after vecuronium (P < 0.05). Time to the return of T1 was less in the TOF-DI than in the TOF-AP group (23.1 +/- 6.0 vs 27.6 +/- 4.9 min, P = 0.0334). CONCLUSION: Recovery of responses to PTT and TOF stimuli occurred earlier at the DI than at the AP.

Adult↗
PubMed1996

Neuromuscular monitoring: does it make a difference?

PURPOSE: The objective of the present prospective study was to evaluate the influence of neuromuscular monitoring on the level of neuromuscular blockade from induction of anaesthesia until extubation of the trachea. METHODS: Forty-two patients aged between 18 and 73 yr undergoing a range of surgical procedures under general anaesthesia were randomly distributed into two groups of 21 patients each. In both groups a Datex NMT Monitor was used and electromyographic responses of the ulnar muscles to supramaximal stimulation of the ulnar nerve were recorded. In Group 1, the anaesthetist could see the movements of the stimulated hand, but not the monitor. In Group 2, the anaesthetist could see neither the stimulated hand nor the monitor. The same anaesthetist administered the neuromuscular relaxants which were succinylcholine 1.5 mg.kg-1 for tracheal intubation and vecuronium 0.1 mg.kg-1 for neuromuscular relaxation during surgery, followed by 1 to 2 mg maintenance injections. Possible residual curarization was evaluated in the recovery room by head life tests and pulse oximetry. RESULTS: Patients in Group 1 had deeper neuromuscular block throughout surgery, despite the use of a comparable dose of vecuronium (10.1 mg for G1 vs 11.2 mg for G2). The EMG values of T1 and train-of-four values were not different at tracheal intubation or at extubation. No patients presented signs of residual curarization in the recovery room. CONCLUSION: The study demonstrates that with the same amount of vecuronium the neuromuscular relaxation was deeper with the use of a simple neuromuscular monitoring (visual evaluation of the thumb movements). Despite the deeper neuromuscular block in the monitored group, there was no residual curarization in the recovery room.

Adolescent↗
PubMed1996

Acceleromyography improves detection of residual neuromuscular blockade in children.

PURPOSE: To determine whether detection of residual blockade is improved by using the accelerograph. A secondary objective was to compare acceleromyographic measurements with those obtained by electromyography. METHODS: In a prospective, randomized, double-blind investigation, 22 anaesthetized children were studied during recovery from neuromuscular blockade following 0.1 mg.kg-1 vecuronium i.v.. Assessments of depth of block began 10 min after injection and were repeated at one minute intervals using electromyography (Datex, Relaxograph) in one hand, and acceleromyography (Biometer, Tofguard) in the other, to measure response of the adductor pollicis to train-of-four (TOF) stimulation of the ulnar nerve. Monitoring was stopped when no fade was visible and TOF ratio > or = 0.7. The electromyographic (EMG) and acceleromyographic (AMG) data were compared with corresponding observations of the number of twitches and TOF fade in the visible responses of the thumb, made by the attending anaesthetist. The method of Bland and Altman was used to compare differences between AMG and EMG data. RESULTS: During recovery from neuromuscular blockade, fade was no longer visible clinically 38.6 +/- 10.4 min (mean +/- SD) after the administration of vecuronium. This corresponded to TOF ratios of 0.04 +/- 0.23 by AMG and 0.34 +/- 0.21 by EMG. Usually, two twitches were visible before AMG detected the first twitch. The time to TOF ratio > or = 0.7 by AMG and EMG was similar at 49.1 +/- 10.5 and 50.9 +/- 9.0 min, respectively. The bias between AMG and EMG was one minute, with limits of agreement from -10 to nine min. CONCLUSION: AMG is superior to visual assessment in detecting residual neuromuscular block and provides similar estimates of recovering block as the more cumbersome EMG.

Anesthesia Recovery Period↗
PubMed1995

Mivacurium infusion requirements following vecuronium: different response between adults and children.

The mivacurium infusion requirements following vecuronium were evaluated in 15 adults and 15 children in an open prospective clinical study. This study was undertaken to elucidate whether potentiation of effect occurred when a mivacurium infusion was administered after vecuronium was used for the facilitation of tracheal intubation. The adult patients were anaesthetized with N2O:02, propofol and fentanyl, the children with halothane (1%) N2O:O2. Vecuronium 100 micrograms.kg-1 was administered during stimulation of the ulnar nerve with train-of-four stimuli at 0.1 Hz. The force of contraction of adductor pollicis was recorded. Upon recovery of the twitch response from vecuronium, a mivacurium infusion was started at 4 micrograms.kg-1.min-1, thereafter adjustments were made to maintain the first twitch of the train-of-four (T1) at 1-10% of control. The mean (+/- SE) initial infusion requirements in children of mivacurium was 4.3 (0.4) micrograms.kg-1.min-1 which increased linearly (P < 0.001) over the next 90 min to 10 micrograms.kg-1.min-1. In adults the infusion requirement was lower than in children and remained at approximately 3 micrograms.kg-1.min-1 over the next 75 min. At the end of the surgical procedure, the children recovered faster than the adults with no child requiring reversal. Because of prolonged recovery ( > 20 min), seven adults required reversal with 15-70 micrograms.kg-1 neostigmine. Mivacurium infusion requirements following vecuronium are higher in children than adults. Potentiation of the effects of mivacurium were seen when vecuronium preceded mivacurium. This potentiation of effect lasted longer in adults than in children.

Adolescent↗
PubMed1996

Double burst stimulation2,3: a new stimulating pattern for residual neuromuscular block.

PURPOSE: We present a new stimulating pattern: double burst stimulation2,3 (DBS2,3) for evaluating residual neuromuscular block. METHODS: Forty adult patients were studied. For DBS2,3, two burst stimuli were applied every 750 msec. The first consisted of two tetanic stimuli of 0.2 msec duration and the second of three tetanic stimuli of 0.2 msec duration. At varying degrees of neuromuscular block induced by vecuronium, the presence or absence of fade, or the presence or absence of waxing (i.e., the feeling that the muscular contraction in response to the second burst was stronger than that to the first) was determined by an observer blinded to the depth of neuromuscular block. In addition, the relationship between the train-of-four (TOF) ratio and DBS2,3 ratio was established at varying depths of neuromuscular block (TOF ratio 0.04-1.00). RESULTS: The probabilities of tactile detection of fade in response to DBS2,3 were 100, 76, 15, 9, 3, 0, and 0% at a TOF ratio of 0-0.40, 0.41-0.50, 0.51-0.60, 0.61-0.70, 0.71-0.80, 0.81-0.90, and 0.91-1.00, respectively. Waxing in response to the DBS2,3 was identified in 0, 6, 32, 84, and 98% of cases when the TOF ratios were 0.00-0.60, 0.61-0.70, 0.71-0.80, 0.81-0.90, and 0.91-1.00, respectively. A close linear relationship existed between the TOF ratio and DBS2,3 ratio (r = 0.96, P < 0.000001). CONCLUSION: DBS2,3 is of clinical use because when residual neuromuscular block is clinically important, fade can be identified, but once neuromuscular function returns to a sufficient level, waxing can be detected.

Adult↗
PubMed1998

Postoperative analgesia with "3-in-1" femoral nerve block after prosthetic hip surgery.

PURPOSE: To evaluate the efficacy of a single shot "3-in-1" femoral nerve block for prosthetic hip surgery in association with general anaesthesia on post-operative analgesia. METHODS: Forty patients, ASA 1 to 3, received sham block or "3-in-1" femoral nerve block, following Winnie's landmarks with a nerve stimulator, and 40 ml bupivacaine 0.5% with epinephrine were injected after induction of anaesthesia. Vecuronium, 0.1 mg.kg-1, was added after performing the block and anaesthesia was maintained with isoflurane, oxygen 40% and nitrous oxide 60%. Fentanyl, 1.5 microgram.kg-1, was administered before incision to all patients. Heart rate, blood pressure, fentanyl requirements and FETiso were measured throughout surgery. During the post-operative period, 75 mg diclofenac i.m. and/or 0.1 mg.kg-1 morphine s.c. were administered when pain score was > 3/10 and repeated when necessary. Pain scores at first analgesic intervention, at 24 hr and 48 hr as well as diclofenac and morphine requirements after surgery were recorded. RESULTS: There was no difference in anaesthetic requirements during surgery. The time from performance of sham or "3-in-1" femoral nerve block to the first analgesic intervention (261 +/- 49 min versus 492 +/- 40 min, P < 0.05) and time from extubation to the first analgesic intervention (61 +/- 44 min vs 298 +/- 39 min, P < 0.05) were prolonged in the study group. However, pain scores and the analgesic requirements in the postoperative periods (24 and 48 hr) were similar. CONCLUSION: There is a short-term benefit during the first few postoperative hours in using a single shot "3-in-1" femoral nerve block to complement general anaesthesia for elective hip surgery.

Adjuvants, Anesthesia↗