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PubMed1994

Recovery from pre-operative sedation with clonidine--brain stem auditory evoked response.

In a randomised double-blind study, 34 elderly patients (ASA grades 1-2) underwent elective intra-ocular surgery. Patients were allocated randomly to two groups to receive oral clonidine 300 micrograms or oral diazepam 10 mg 2 h before surgery. Facial block and retrobulbar block were given at 2 h after premedication. Anaesthetic recovery was assessed using a clinical recovery score (at 0, 30, 60 and 120 min after arrival in the recovery room) and brain stem auditory evoked potential responses (BAER) (immediately after operation and at 120 min after operation). In both the groups the clinical recovery scores decreased significantly at 30 and 60 min following recovery (p < 0.01). At 120 min this score returned to the pre-operative value in the clonidine group, but in the diazepam group there was a significant difference between the 2h value and pre-operative value (p < 0.05). In the clonidine group there was no significant rise in the interpeak latencies and absolute peak latencies of brain stem auditory evoked responses recorded immediately after operation and 120 min after operation. In the diazepam group, there was a significant rise in the interpeak latencies immediately after operation and 120 min after operation and a rise in absolute peak latencies (p < 0.05) immediately after operation. In the clonidine group there was a reduction (p < 0.05) in amplitude of wave V at immediately after operation. We conclude that clonidine 300 micrograms orally before surgery does not delay recovery.

Aged↗
PubMed1981

Measuring immediate recovery from general anaesthesia using a scoring system.

The study describes the design and testing of a scoring system to measure immediate recovery from anaesthesia. The scoring system which measures the patient's cognitive, motor haemodynamic and respiratory recovery, was applied in 1,626 patients. The score was measured at five minutes intervals and the results were plotted on recovery graphs for each patient. The analysis shows that patients who had received automatic ventilation during their anaesthetic were likely to arrive in the recovery room with a score of 14 or 15 (the top score), while other patients were likely to arrive with lower scores and progressed in their recovery at 0.9 (SD 0.6) score units per minute. Multivariate analysis confirms that the anaesthetist's decision to employ automatic or spontaneous ventilation is the most important single factor in determining the rate of increase of the recovery score. It is suggested that this scoring system, which fits well with the clinical appreciation of the case, is a useful tool in the hands of the recovery nurse.

Anesthesia, General↗
PubMed1999

Midazolam premedication delays recovery from propofol-induced sevoflurane anesthesia in children 1-3 yr.

PURPOSE: To study the effect of midazolam premedication on the recovery characteristics of sevoflurane anesthesia induced with propofol in pediatric outpatients. METHODS: Sixty children, one to three years, presenting for ambulatory adenoidectomy were randomly assigned , in a double-blind fashion, to receive either 0.5 mg x kg(-1) midazolam (Group M) or placebo (Group P) p.o. 30 min before anesthesia. Anesthesia was induced with 10 microg x kg(-1) atropine, 10 microg x kg(-1) alfentanil, and 3-4 mg x kg(-1) propofol i.v.. Tracheal intubation was facilitated with 0.2 mg x kg(-1) mivacurium. Anesthesia was maintained with nitrous oxide/oxygen (FiO2 0.3) and sevoflurane with controlled ventilation. Recovery characteristics were compared using the modified Aldrete scoring system, the Pain/Discomfort scale and measuring specific recovery end-points (emergence, full Aldrete score, discharge). A postoperative questionnaire was used to evaluate the children's well-being at home until 24 hr after discharge. RESULTS: Emergence from anesthesia (22 +/- 9 vs 16 +/- 6 min (mean +/- SD), P = 0.005) and achieving full Aldrete scores (30 +/- 11 vs 24 +/- 16 min, P = 0.006) were delayed in patients receiving midazolam. Children in the placebo group were given postoperative analgesia sooner than those in the midazolam group (18 +/- 11 vs 23 +/- 8 min, P = 0.009). More children premedicated with midazolam suffered from arousal distress (20% vs 3%, P = 0.04) and scored higher on the Pain/Discomfort scale (P = 0.004) at 20 min after arrival in the recovery room. Discharge was not affected by premedication and well-being at home was similar in the groups. CONCLUSIONS: Oral premedication with midazolam delays early recovery but not discharge after ambulatory sevoflurane anesthesia induced with propofol in children one to three years. Midazolam did not improve the quality of recovery.

Adenoidectomy↗
PubMed1992

The influence of an anesthetic regimen on patient care, outcome, and hospital charges.

The effects of the anesthetic regimen on patient care, outcome, and hospital charges were studied in 86 morbidly obese patients who underwent gastric reservoir reduction at two hospitals (A and B) in the Detroit Medical Center. At Hospital A, postoperative ventilation was routinely planned in 36 patients who received two intravenous lines, an arterial ine, and a Foley catheter. At Hospital B, postoperative ventilation was not routinely planned for in 50 patients who received one intravenous line and no Foley catheter or arterial line. For anesthesia, Hospital A routinely used isoflurane (0.98%) and N2O (53.0%) with little fentanyl (0.7 mg in 26 patients). Muscle relaxation with pancuronium (13.2 mg) was reversed in only five patients. In contrast, Hospital B patients used little isoflurane (0.4% in 14 patients),* more N2O (64.0%),* more fentanyl (1.3 mg),* and less pancuronium (9.7 mg)*; reversal with naloxone and pyridostigmine was routine. The operating room time was longer in Hospital A patients (5.0 vs 4.6 hours),* and they received significantly more intravenous fluids (6.2L vs 3.2L).* Routine postoperative ventilation in Hospital A patients led to a 46.5 hour intensive care unit stay and a 9.7 day postoperative stay. In contrast, routine anesthetic reversal allowed operating room extubation, patient self-transfer to the stretcher, and ambulation on the day of surgery in Hospital B where patients had a 1.7 hour recovery room stay and a 9.6 day postoperative stay. Total hospital charges in Hospital A patients averaged $14,524.00 due to the increased cost of the intensive care unit ($2,094.00) and support services versus $7,580.00* in Hospital B patients. All 86 patients survived.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1985

Respiratory sinus arrhythmia during recovery from isoflurane-nitrous oxide anesthesia.

Heart rate and respiratory patterns were monitored in ten ambulatory female patients undergoing elective laparoscopy. The patients were anesthetized with isoflurane-nitrous oxide. An index of cardiac vagal tone determined from the heart rate pattern by quantifying the amplitude of respiratory sinus arrhythmia was elevated over four 10-min periods: before induction of anesthesia; during maintenance of anesthesia; upon arrival in the recovery room; and 20-30 min later when the patient was fully conscious. All ten patients' vagal tones were lowest during maintenance of anesthesia. During the recovery periods vagal tone increased and approached the conscious level. On-line analysis of respiratory sinus arrhythmia may provide a physiological index of the level of anesthesia and the rate of recovery.

Adult↗
PubMed1992

Comparison of postoperative analgesic effects of intraarticular bupivacaine and morphine following arthroscopic knee surgery.

Recent studies have shown that, in the presence of inflammation, the local administration of opioids results in analgesia. The analgesic efficacy of local anesthetics and morphine administered intraarticularly was compared in patients undergoing arthroscopic knee surgery under epidural anesthesia. We compared postoperative pain scores (VAS) and opioid requirements among 47 patients receiving, in a randomized, double-blinded fashion, one of three intraarticular medications (20 ml): normal saline with 100 micrograms epinephrine (group 1, n = 16); 0.25% bupivacaine with 100 micrograms epinephrine (group 2, n = 15); and 3 mg morphine sulfate and 100 micrograms epinephrine in normal saline (group 3, n = 16). VAS scores were similar in the groups preoperatively and on arrival in the recovery room. At the end of the first postoperative hour, the residual sensory blockade was minimal in all three groups (mean = 3.8-4.1 segments) and almost total recovery occurred in all three groups before the second postoperative hour. The VAS in group 3 was not significantly different than group 1 at any time interval. Intraarticular bupivacaine (group 2) provided significantly better analgesia than did saline or morphine (group 1 or 3) in the first 2 postoperative hours (ANOVA, P < .05). Subsequent VAS scores were not significantly different in the three groups. While no patient in group 2 requested analgesics during the first postoperative hour, nine patients in group 3 required systemic analgesics (P < .01). We conclude that no evidence for a peripheral opiate-receptor mediated analgesia could be demonstrated in patients undergoing arthroscopic knee surgery under epidural anesthesia.

Adult↗
PubMed1991

Efficacy of therapeutic suggestions for improved postoperative recovery presented during general anesthesia.

There have been claims that the postoperative course of patients may be improved by presentation during general anesthesia of therapeutic suggestions which predict a rapid and comfortable postoperative recovery. This study evaluated the effectiveness of such therapeutic suggestions under double-blind and randomized conditions. A tape recording predicting a smooth recovery during a short postoperative stay without pain, nausea, or vomiting was played during anesthesia to about half the patients (N = 109), while the remaining, control patients were played a blank tape instead (N = 100). The patients were primarily undergoing operations on the fallopian tubes, total abdominal hysterectomy, vertical banding gastroplasty, cholecystectomy, and ovarian cystectomy or myomectomy. The anesthesia methods consisted of either isoflurane with 70% nitrous oxide in oxygen to produce end-tidal concentrations of 1.0, 1.3, or 1.5 MAC; or 70% nitrous oxide in oxygen combined with high or low doses of opioids. Assessments of the efficacy of the therapeutic suggestions in the recovery room and throughout the postoperative hospital stay included: the frequency of administration of analgesic and antiemetic drugs; opioid doses; the incidence of fever; nausea, retching, and vomiting; other gastrointestinal and urinary symptoms; ratings of pain; ratings of anxiety; global ratings of the patients' physical and psychological recoveries by the patients and their nurses; and length of postoperative hospital stay. There were no meaningful, significant differences in postoperative recovery of patients receiving therapeutic suggestions and controls. These negative results were not likely to be due to insensitivity of the assessments of recovery, as they showed meaningful interrelations among themselves and numerous differences in recovery following different types of surgery. Widespread utilization of therapeutic suggestions as a routine operating room procedure seems premature in the absence of adequate replication of previously published positive studies.

Adult↗
PubMed1996

Analgesia after otoplasty: regional nerve blockade vs local anaesthetic infiltration of the ear.

PURPOSE: Children scheduled to undergo otoplasty experience severe pain postoperatively. Nausea and vomiting is also a problem. This study was designed to compare two analgesic techniques (i) regional nerve blockade (ii) local anaesthetic infiltration, with respect to quality and duration of analgesia, opioid requirements and the incidence of postoperative nausea and vomiting (PONV). METHODS: Forty three children, ASA I-II, aged 3-15 yr, were studied and followed for 24 hr postoperatively. Patients were randomised into two groups. Patients in Group A received local infiltration with lidocaine 1% with adrenaline 1:200,000 0.4 ml.kg-1 (n = 21). Patients in Group B (n = 22) received nerve blockade, bupivacaine 0.5%, 0.4 ml.kg-1. No other form of analgesia was used intraoperatively. Quality and duration of analgesia were assessed using pain and sedation scores recorded by a blinded observer at 0, 5, 10, 15, 30, 45 min with Recovery Room, and at 0, 30, 60, 90, 120, 180, 240, 360, 480 min on the ward. Pain score > 6 was treated with fentanyl 1 microgram.kg-1 iv (recovery) and morphine 0.2 mg.kg-1 im or mefenamic acid 8 mg.kg-1 po on the ward. Time to first supplemental analgesia was noted. Mean duration of analgesia was 8.6 (1.1-24) hr, Group A and 10.5 (1.3-24) hr, Group B (P > 0.7). 24% per cent of children (Group A) and 27% (Group B) required no supplemental analgesia (P > 0.6). The degree of pain control resulted in a low requirement for opioids, Group A: 24%, Group B: 14% (P:NS). The overall incidence of PONV was 43% (Group A) and 36% (Group B) (P:NS): PONV correlated with opioid use. There were no differences between the groups with regard to pain/sedation scores, quality/duration of analgesia, opioid requirements and incidence of PONV. CONCLUSION: Both techniques provided excellent postoperative analgesia. Lidocaine 1% infiltration (adrenaline 1:200,000) has the added advantage of improving surgical field and haemostasis. Thus, we advocate use of the simpler technique.

Adolescent↗
PubMed1991

Hypoxaemia during anaesthesia--an observer study.

We have investigated 296 inpatients in a single-blind observer study to determine the incidence, degree and duration of hypoxaemia during anaesthesia. The clinical recognition of hypoxaemia, period of time until recognition and risk factors were studied. Oxygen saturation (Spo2) was monitored continuously with a pulse oximeter (Ohmeda, model 3700). One or more episodes of mild hypoxaemia (Spo2 86-90%) were recorded in 53% of patients. Severe hypoxaemia with Spo2 values less than 81% were recorded in 20% of patients. The mild hypoxaemic episodes lasted up to 34.6 min (mean 2.3 min) and 70% were not detected by the anaesthetist. In the remaining 30% of episodes, the anaesthetist diagnosed the complication with a mean time delay of 70 s. After intervention a mean time delay of 57 s was recorded until Spo2 exceeded 90%. Utilizing a stepwise multiple logistic regression analysis, we found that risk factors associated with a greater incidence of hypoxaemia were patient age (P less than 0.005) and anaesthetic technique (P less than 0.00001). We conclude that hypoxaemic episodes in our operating rooms are common during anaesthesia and suggest preoxygenation in all patients in addition to administration of supplementary oxygen during arousal from anaesthesia and during transfer to the recovery room.

Adolescent↗
PubMed1989

Incidence of emesis and postanesthetic recovery after strabismus surgery in children: a comparison of droperidol and lidocaine.

The authors sought to compare the antiemetic and sedative postanesthetic effects of droperidol versus lidocaine given intravenously. One hundred and fifty children, ASA physical status I or II, ages 2-15 yr, were studied. Each child was randomly assigned to receive either droperidol, 0.075 mg/kg; lidocaine, 1.5 mg/kg; or a combination of lidocaine, 1.5 mg/kg, and a reduced dose of droperidol, 0.025 mg/kg, immediately after induction of anesthesia, which was with thiopental, atropine, and succinylcholine. Anesthesia was maintained with halothane and nitrous oxide. The incidence of postanesthetic vomiting was 22% in the droperidol-alone group, which was significantly less than the lidocaine-alone group (50%). The incidence of vomiting in the combination group (30%) was not significantly different from either the droperidol- or lidocaine-alone groups. The time in the recovery room was significantly shorter for patients given lidocaine alone than those given droperidol alone or the combination. However, the mean time intervals from completion of surgery to recovery of full alertness and to discharge from the hospital did not differ significantly among the three groups. In summary, the authors found that intravenous droperidol is significantly more effective than lidocaine in reducing the incidence of vomiting in unpremedicated children after strabismus surgery. Furthermore, droperidol did not delay either the time to recovery of full alertness or the time to discharge from hospital compared to lidocaine.

Adolescent↗
PubMed1984

Delayed hydrothorax following percutaneous central venous cannulation.

Isolated cases of delayed complications associated with prolonged use of percutaneous central venous lines have been reported. We report four patients who developed hydrothorax more than 24 h after central venous cannulation due to perforation of an intrathoracic vein wall by the catheter tip. The patients were all adults of average body habitus. Left-sided catheters were placed in the operating room after anesthetic induction by experienced personnel using the Seldinger technique and secured in position with a dressing and tape. Chest x-rays taken in the recovery room showed all catheter tips terminated in the central vein and no evidence of hydrothorax. Hydrothorax was manifested in the post-operative period and occurred 1-7 days postcannulation. We are left with the conclusion that the delayed hydrothorax resulted from gradual penetration of the vein wall by the catheter tip. We feel a combination of factors probably contributed to the vein wall erosion. First, the insecure fixation of the catheter combined with head, neck, and cardiopulmonary motion has been shown to result in the back-and-forth movement of the catheter tip. Second, the stiff catheters in the left jugular system take a curved course to the superior vena cava bringing the catheter tip into close proximity to the wall of the superior vena cava. We therefore conclude that late developing hydrothorax can be minimized by using a soft, pliable catheter, sutured firmly in place. Right-sided line placement is preferable to left-sided placement because of the anatomic relationships.

Adult↗
PubMed2001

Comparison of recovery after intermediate duration of anaesthesia with sevoflurane and isoflurane.

BACKGROUND: The purpose of this study was to compare recovery from anaesthesia after sevoflurane and isoflurane were administered to children for more than 90 min. METHODS: After parental informed consent and ethical committee approval, children aged between 2 months and 6 years, ASA I or II, were randomly allocated to sevoflurane (n=20) or isoflurane (n=20) groups. Halogenated agents were discontinued following skin closure and patients were ventilated mechanically with 100% oxygen until minimum alveolar concentration (MAC) values awake were obtained (endtidal concentrations 0.6 MAC for sevoflurane and 0.4 MAC for isoflurane). Effective perioperative analgesia was provided by a caudal block. RESULTS: The mean (+/- SD) duration of anaesthesia was 132 +/- 38 min and 139 +/- 49 min for sevoflurane and isoflurane, respectively. Early recovery occurred sooner in the isoflurane group (time to extubation was 16 +/- 7 min and 11 +/- 5 min, P<0.01; Aldrete's score at 0 min was 5.5 +/- 1.5 and 7.4 +/- 1.8, P<0.001, respectively). But the time to be fit for discharge from recovery room was similar at 136 +/- 18 min and 140 +/- 20 min, respectively. CONCLUSIONS: After intermediate duration of anaesthesia administered to children for up to 90 min, isoflurane and sevoflurane allow recovery after approximatively the same lapse of time.

Anesthesia Recovery Period↗
PubMed2006

Increasing operating room efficiency through parallel processing.

OBJECTIVE: Because of rising costs and shrinking reimbursements, hospitals must continually find ways to improve efficiency and productivity. This study attempts to increase caseloads in ambulatory surgery operating rooms while maintaining patient satisfaction and safety. SUMMARY BACKGROUND DATA: In most hospitals, patients move through their operative day in a linear fashion, starting at registration and finishing in the recovery room. Given this pattern, only 1 patient may occupy the efforts of the operating room team at a time. By processing patients in a parallel fashion, operating room efficiency and patient throughput are increased while costs remain stable. METHODS: Patients undergoing hernia repairs under local anesthesia with intravenous sedation were divided into a control group and an experimental group. Patients in the control group received their local anesthesia in the operating room at the start of the surgery. The experimental group patients received their local anesthesia in the induction room by the surgeon while the operating room was being cleaned and set up. RESULTS: While operative time for the control group and the experimental group were nearly identical, the turnover time and the induction time were significantly shorter for the experimental group. The cumulative reduction in time during the operative day was sufficient to allow the addition of new operative cases. CONCLUSIONS: This study demonstrates a system of increasing operating room efficiency by changing patient flow rather than simply working to streamline existing steps. This increase in efficiency is not associated with the expansion of hospital budgets or a decrease in patient safety or satisfaction.

Ambulatory Surgical Procedures↗
PubMed1996

Review of efficiencies and patient satisfaction in Australian and New Zealand day surgery units: a pilot study.

A pilot study was performed in eight Australasian day surgery facilities with a purpose of identifying common trends and differences. A prospective study was designed in which information was collected on 826 patients over a two-week period. Patients were well matched for age, anaesthetic type and mean surgical time. Three facility types were identified and results were statistically corrected for any differences that ASA status, age and surgical time may have made. Patient preoperative waiting time, recovery room times, delayed discharge time and unanticipated admission rates showed favourable outcome trends for free-standing facilities compared with hospital-integrated facilities where day patients had a shared recovery with inpatients. Similar trends were seen with patient opinions of waiting times and recovery periods. In summary, this pilot study has demonstrated the impact of different facility types on efficiencies and patient satisfaction both of which have important cost implications and relevance to those involved in continuous quality improvement processes in day surgery.

Adult↗
PubMed2000

Routine droperidol pre-medication improves sedation for ERCP.

BACKGROUND: Pre-medication with droperidol has been used to improve sedation during endoscopy, especially in patients with a history of alcohol or narcotic abuse. We studied whether routine use of droperidol pre-endoscopic retrograde cholangiopancreatography (ERCP) could improve patient and physician satisfaction with sedation. METHODS: Sixty-seven patients undergoing routine ERCP were enrolled in this double-blind placebo-controlled study. Patients were given either parenteral normal saline solution or 5 mg of droperidol 15 minutes before the procedure. After the ERCP, several parameters of procedural sedation were scored on an ordinal scale by the endoscopist, the endoscopy nurse, and the recovered patient. In addition, a follow-up telephone call was made to the patient after 24 hours. RESULTS: The mean procedural room time was similar in the two groups. Nearly 25% less meperidine and diazepam was used in the droperidol-treated patients, making the overall medication cost similar in both groups. The mean recovery room time was 113 minutes for the placebo group and 106 minutes for the droperidol group. Droperidol premedication significantly decreased post-procedure nausea and vomiting, reduced gagging at intubation, and decreased retching during the procedure. Droperidol also improved physician (p = 0.001), nurse (p = 0.001), and patient (p = 0.0001) impressions of overall sedation and decreased the need for physical restraint during the procedure. Droperidol significantly increased the number of patients with no memory of the procedure. CONCLUSION: Droperidol improved overall patient, physician, and nurse satisfaction with sedation during ERCP. It also reduced post-ERCP nausea and vomiting without increasing recovery time or medication cost. Droperidol is recommended for routine pre-ERCP sedation. (Gastrointest Endosc 2000;52:362-6).

Adolescent↗
PubMed2002

[Efficacy of bispectral index monitoring in improving anesthetic management, economics, and use of the operating theater].

This study was designed to assess the efficacy of bispectral index (BIS) monitoring in reducing the amount of volatile anesthetics used and improving recovery profiles. Sixty patients (ASA physical status 1 or 2) undergoing various surgical procedures under sevoflurane/nitrous oxide anesthesia were studied. The patients were randomly assigned to two groups of which anesthesia was carried out with (BIS group) or without (control group) monitoring BIS, and in the latter, anesthesiologist was blinded to the BIS values. In the BIS group, sevoflurane concentration was adjusted to achieve target BIS values between 40-60 during surgery and 60-75 during the final 15 min of the surgery. Drug usage, incidence of intraoperative complications, and recovery parameters were recorded. Demographics were similar between the groups. The BIS values in the BIS group were significantly higher compared with those of control group in which BIS values were blinded during anesthesia. The sevoflurane consumption in the BIS group (17 +/- 3 ml.h-1) was lower than control group (22 +/- 3 ml.h-1). Compared with control group, the patients in BIS group were extubated earlier and became eligible for discharge earlier from recovery room than control group. There was no significant difference in the incidence of intraoperative complications between the groups. Titrating sevoflurane concentration with BIS monitoring during anesthesia decreased anesthetic consumption and improved recovery compared with standard clinical practice.

Adult↗
PubMed1997

Oxygen desaturation in a child receiving a combination of ketamine and midazolam for dental extractions.

A combination of 0.35 mg/kg midazolam and 5 mg/kg ketamine, administered orally for pediatric sedation, resulted in a severe decreases in blood oxygen saturation postoperatively. The patient, a 2-yr-old child, did not respond to command or mild physical stimulation in the recovery room 60 min after receiving the drugs. The benzodiazepine antagonist, flumazenil (0.01 mg/kg), was administered intravenously to reverse the action of midazolam. No adverse effects were observed thereafter, and the postoperative recovery was uneventful. Combining different classes of drugs may result in less variability in patients response, but there is a greater potential for drug-induced side effects and drug interactions.

Anesthesia, Dental↗
PubMed1999

Effect of a remifentanil bolus dose on the cardiovascular response to emergence from anaesthesia and tracheal extubation.

We have examined the effect of remifentanil on the haemodynamic response to emergence from anaesthesia and tracheal extubation in 40 ASA I-II female patients undergoing diagnostic laparoscopy, in a randomized, double-blind study. All patients received a standard general anaesthetic comprising propofol, vecuronium and 1% isoflurane with 66% nitrous oxide in oxygen. At the end of surgery, a bolus dose of remifentanil 1 microgram kg-1 (n = 20) or saline placebo (n = 20) was given and tracheal extubation was performed when standard criteria were achieved. Arterial pressure and heart rate were recorded non-invasively at 1-min intervals from the end of surgery. Remifentanil attenuated the increase in both mean arterial pressure (P < 0.001) and heart rate (P < 0.05) at extubation. Mean time to extubation was 7.2 (SEM 0.6) min and 4.0 (0.5) min in the remifentanil and saline groups, respectively (P < 0.001). There was no difference in the incidence of coughing at extubation, time to recovery from anaesthesia or time to fitness for discharge from the recovery room.

Adolescent↗