Effect of systemic lidocaine infusion on train-of-four ratios during recovery from general anesthesia

IntroductionIn spite of introduction of intermediate-acting neuromuscular blocking drugs (NMBDs), incidence of postoperative residual muscle weakness is still high. The aim of this trial is to study the effect of systemic lidocaine infusion on intraoperative consumption of rocuronium and TOF ratios at extubation and on arrival to postanesthesia care unit (PACU).MethodsForty-six ASA I–III patients aged 16–60 yr were randomly allocated into two groups: lidocaine (L) group (n = 23) and control (C) group (n = 23). After induction of standard endotracheal general anesthesia with fentanyl, propofol and rocuronium, patients of group L were given i.v. lidocaine bolus (1.5 mg kg^?1) followed by continuous infusion (1.5 mg kg^?1 h^?1) till time of endotracheal extubation while patients in group C were given equal volumes of normal saline. Rocuronium was titrated based on clinical signs. On conclusion of surgery, neostigmine was given to reverse the effects of rocuronium if TOF count was two or more. Immediately before extubation, TOF ratio was measured and recorded and considered the primary outcome.ResultsThere were no significant differences between the two study groups regarding intraoperative fentanyl doses or core temperature at the end of surgery. End-tidal sevoflurane concentrations were significantly lower in group L than in group P (P < 0.01). The dose of rocuronium was significantly less in group L than in group C (P = 0.001). Train-of four ratios were significantly higher in group L than in group C either before extubation (P < 0.001) or on arrival to PACU (P = 0.001).ConclusionThe current study shows that intraoperative use of i.v. lidocaine infusion in generally anesthetized patients can result in higher TOF ratios at time of extubation and on arrival to PACU when rocuronium was given based on clinical signs.     

Can systemic lidocaine be used in controlled hypotension? A double-blinded randomized controlled study in patients undergoing functional endoscopic sinus surgery

IntroductionFunctional endoscopic sinus surgery (FESS) is one of the operations that need controlled hypotension. Many drugs were successfully used in this purpose, e.g., magnesium sulfate, esmolol, and volatile anesthetics. Hypotension was observed to occur after submucosal injection of lidocaine. Based on this observation, it was hypothesized in this double-blinded randomized controlled study that lidocaine may be effective in producing controlled hypotension.MethodsForty-eight ASA I–II adults planned to undergo FESS were given a standard general anesthetic after which they were divided into 2 equal groups to receive either lidocaine infusion in a dose of 1.5 mg/kg/h (group L, n = 24) or equal volumes of normal saline (group C, n = 24). Primary outcome was the surgical field rating score (0–5 points). Secondary outcomes included hemodynamic parameters, extubation time, end-tidal sevoflurane concentrations, fentanyl consumption, and postoperative visual analog pain scores (VASs).ResultsBoth groups were similar regarding hemodynamic parameters. Surgical field scores were significantly lower in group L than in group C at all intraoperative time points (P < 0.05). Extubation time was significantly longer in group C than in group L [group C: 12.4(2.3) min and group L: 9.1(3) min, P = 0.03]. Intraoperative fentanyl dose was significantly higher in group C than in group L [group C: 172(37) mcg and group L: 149(34) mcg, P = 0.03]. End-tidal sevoflurane concentrations were significantly lower in group L than in group C at most intraoperative time points (P < 0.05). Postoperative VAS pain scores in the PACU were higher in group C than in group L (P < 0.05).ConclusionThis study showed the ability of intravenous lidocaine infusion of 1.5 mg/kg/h to produce controlled hypotension in patients undergoing FESS and the superiority of this technique over placebo to achieve favorable surgical field scoring.     

Efficacy of prophylactic use of hydrocortisone and low dose ketamine for prevention of shivering during spinal anesthesia

BackgroundSpinal anesthesia is commonly associated with shivering. The aim of this study was to compare the efficacy of i.v. hydrocortisone with i.v. low dose ketamine or placebo for prevention of shivering during spinal anesthesia.MethodIn this prospective, randomized, double-blind study, 90 female patients ASA I–II age 30–60 years old, undergoing posterior vaginal repair surgeries under spinal anesthesia with 3 ml heavy bupivacaine 0.5% (15 mg), patients were randomly allocated into one of three groups, (Group S, n = 30) (control) received saline, (Group K, n = 30) received ketamine 0.25 mg kg^?1 or (Group H, n = 30) received hydrocortisone 2 mg kg^?1, the drugs were given i.v. just after spinal anesthesia with recording of vital signs, and core temperature every 15 min intraoperative and every 10 min in recovery room. The incidence and intensity of shivering, number of patients received meperidine, sensory level, motor block grade, and side effects (hypotension, hypertension, tachycardia, nausea and vomiting, sedation and hallucinations) were also recorded.ResultsIncidence of shivering were significantly reduced in k and H groups being 20% and 23.3% respectively compared to S group (p < 0.05). Patients received meperidine to control shivering were significantly low in Groups K and H compared to group S (p < 0.05), with no difference between Groups K and H.ConclusionsThe prophylactic administration of low dose ketamine (0.25 mg kg^?1) and hydrocortisone (2 mg kg^?1) were comparable in reducing the incidence of shivering and both had significant antishivering effect compared to placebo, in female patients under spinal anesthesia for posterior vaginal repair surgeries.     

Dexmedetomidine is an effective adjuvant to subtenon block in phacoemulsification cataract surgery

BackgroundResearches to find a better adjuvant in regional anesthesia are still continued until now.Dexmedetomidine prolongs anesthesia and analgesia of local anesthetics in various neural blocks as well as the onset of sensory and motor block. The objective of the present study was to evaluate the effect of adding dexmedetomidine to local anesthetics on the sensory and motor block of the subtenon block in patients undergoing phacoemulsification cataract surgery.MethodsSixty patients of American Society of Anaesthesiologists (ASA) grade I–III, aged between 18 and 70 years, scheduled for phacoemulsification cataract surgery were randomly assigned to two equal groups. Group C (control group) received 2 ml of a mixture of 2% lidocaine and 0.5% bupivacaine and Group D (dexmedetomidine group) received 2 ml of a mixture of 2% lidocaine and 0.5% bupivacaine plus dexmedetomidine (0.5 μg/kg). Onset and duration of sensory and motor block was recorded. Pain during administration of anesthesia and during surgery was graded using the verbal analogue scale and recorded. Intraocular pressure, hemodynamic, and sedation parameters were recorded before and after surgery.ResultsOnset of both sensory and motor block was significantly decreased in group D (P < 0.001, P = 0.004 respectively), and duration of sensory and motor block was more prolonged in group D than in group C (P < 0.001, P = 0.961). Pain during administration of anesthesia was significantly lower in group I compared with group II, and more patients in group I compared with group II were pain free, without a significant difference between the two groups. Intraocular pressure was significantly decreased in group D (P < 0.001). More sedation score was observed in group D (P = 0.022). Heart rate and mean arterial blood pressure were insignificantly decreased in group D more than in group C.ConclusionDexmedetomidine is a safe and effective adjuvant to subtenon block in phacoemulsification cataract surgery.     

Effect of propofol,sevoflurane, and isoflurane on postoperative cognitive dysfunction following laparoscopic cholecystectomy in elderly patients: A randomized controlled trial

Study objectiveTo compare the incidence of postoperative cognitive dysfunction (POCD) in elderly surgical patients (> 60 years) receiving different anesthetics (propofol, sevoflurane, or isoflurane) and to identify potential biomarkers of POCD in this patient population.DesignProspective, randomized, double-blind clinical trial.SettingUniversity-affiliated teaching hospital.PatientsOne hundred and fifty elderly patients scheduled for laparoscopic cholecystectomy.InterventionsElderly patients undergoing laparoscopic cholecystectomy were randomly assigned to receive propofol, sevoflurane, or isoflurane anesthesia. Measurements: Cognitive function was assessed using neuropsychological tests at baseline (1 day before surgery [D0]), and on postoperative day 1 (D1) and day 3 (D3). Plasma S-100β and Aβ_1–40 protein, IL-1β, IL-6 and TNF-α concentrations were assessed before induction of anesthesia (T0), after extubation (T1), and 1 h (T2) and 24 h (T3) postoperatively.Main resultsThe incidence of POCD was significantly lower in the propofol group compared to the isoflurane group and the sevoflurane group at D1 and D3 (propofol vs. isoflurane: D1 and D3, P < 0.001; propofol vs. sevoflurane: D1, P = 0.012; D3, P = 0.013). The incidence of POCD was significantly lower in the sevoflurane group compared to the isoflurane group at D1 ( P = 0.041), but not at D3. Postoperatively, plasma S-100β and Aβ_1–40 protein, IL-1β, IL-6, and TNF-α concentrations were significantly decreased in the propofol group compared to the isoflurane group.ConclusionsPropofol anesthesia may be an option for elderly surgical patients.     

Insomnia may increase anesthetic requirement

Study ObjectiveGamma aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the central nervous system. It is a common target for general anesthetics, and it is strongly related to the etiology of chronic insomnia. In this study, we aimed to investigate whether insomnia has any effect on anesthetic requirement, and we also assessed pain to reveal a relationship with insomnia.DesignThis study designed as a prospective, observational study, registered ANZCTR (ACTRN12616000241437), with institutional review board approval and written informed consent.SettingPreoperative and postoperative areas of the training and research hospital.PatientsInpatients planning to undergo laparoscopic cholecystectomy as an elective surgery were enrolled in this study.InterventionsPatients were divided into 2 groups based on the results of the 4-item Jenkins Sleep Questionnaire which assesses the degree of sleep disturbance: those with or without insomnia. Anesthesia was standardized, and delivered sevoflurane concentration was adjusted according to bispectral index (BIS) value in both groups.MeasurementsParameters of the study were heart rate, noninvasive arterial blood pressure, arterial oxygen saturation, BIS, end-tidal carbon dioxide, and inspiratory and end-tidal concentrations of sevoflurane at 5-minute intervals during the operation. Pain was assessed for all participants; preoperatively using 2-sided blank body manikin (front and back) and postoperatively with numeric rating scale between 0 and 10.Main ResultsEnd-tidal concentration of sevoflurane found higher in insomnia group during the maintenance phase of anesthesia. Pain experience was higher in insomnia group. In addition, postoperative abdominal pain score was higher only at 18-hour interval in insomnia group. Although BIS values were similar in both groups during surgery, mean end-tidal sevoflurane concentrations were significantly higher in insomnia group (1.48 ± 0.20) than control group (1.23 ± 0.18) (P < .0001).ConclusionInsomnia may result in increased anesthetic requirement and pain experience. Further study is required to identify the relationship between insomnia and anesthetics.     

Effect of oral dextromethorphan versus oral ketamine on sevoflurane related emergence agitation in children undergoing adenotonsillectomy

BackgroundEmergence agitation is a popular phenomenon after sevoflurane anesthesia. Our aim was to study the efficacy of oral dextromethorphan compared to oral ketamine on sevoflurane related agitation.MethodsIn a prospective, randomized, double- blinded study 120, ASA I, aged 4–10 years old children undergoing adenotonsillectomy were randomly divided into three groups to receive oral dextromethorphan 1 mg/kg (Group D, n = 39), oral ketamine 5 mg/kg (Group K, n = 39) or placebo(Group C, n = 38) as premedication 1 h before surgery. Standard general anesthesia was induced and maintained with sevoflurane in N₂O/O₂. The following were recorded by a blinded anesthetist; Child separation and cooperation at induction, duration of operation, duration of anesthesia, duration of extubation, duration of emergence, state of emergence on admission to PACU using emergence agitation scale, number of patients required postoperative fentanyl to control agitation, duration of discharge from PACU, vital signs (heart rate, blood pressure, and Spo₂) in PACU, and side effects (Nausea, vomiting, respiratory depression, and hallucination).ResultsThe agitated patients that required fentanyl treatment were statistically significant low in groups D and K compared to group C (p < 0.05). Child separation and child cooperation at induction from parents was successful in all children in group K with statistical significant difference compared to other groups (p < 0.05). There were increases in duration of anesthesia, extubation, and emergence in group K compared to other groups without increase in the duration of stay in PACU.ConclusionOral premedication with either dextromethorphan 1 mg/kg or ketamine 5 mg/kg were comparable in reducing significantly the incidence of postoperative sevoflurane related emergence agitation in comparison to placebo treated group without reported side effects in children undergoing adenotonsillectomy.     

A randomized comparison of onset of anesthesia between spinal bupivacaine 5 mg with immediate epidural 2% lidocaine 5 mL and bupivacaine 10 mg for cesarean delivery

BackgroundPrevious studies using low-dose spinal anesthesia for cesarean delivery have focused on hypotension and efficacy. This study evaluated whether, using a combined spinal–epidural technique, there was a difference in onset of anesthesia for cesarean delivery between low-dose spinal with an immediate epidural local anesthetic bolus, and conventional-dose spinal anesthesia.MethodsForty healthy term nulliparous women undergoing elective cesarean delivery with a combined spinal–epidural technique were enrolled into this prospective, randomized, double-blind study. Patients were randomly allocated to the low-dose (Group L) or conventional-dose group (Group C). Patients in Group L received intrathecal isobaric bupivacaine 5 mg with sufentanil 2.5 μg followed by epidural 2% lidocaine 5 mL; patients in Group C received intrathecal isobaric bupivacaine 10 mg with sufentanil 2.5 μg followed by epidural saline 5 mL. The onset of anesthesia (defined as the time from spinal injection to a block to T6), incidence of hypotension, maximal sensory block, epidural supplementation and side effects were recorded.ResultsAll blocks reached T6 within 11 min except for one patient in Group L. There were no differences in onset of anesthesia (9.9 ± 3.2 min in Group L vs. 8.5 ± 1.2 min in Group C, P = 0.08), maximal block level and the number of patients who required epidural supplementation in both groups. Hypotension occurred in 8 patients (40%) in Group L and 15 patients (75%) in Group C (P = 0.02).ConclusionsIntrathecal bupivacaine 5 mg with immediate 2% epidural lidocaine 5 mL provided comparable onset and efficacy of anesthesia as bupivacaine 10 mg with immediate epidural normal saline 5 mL for cesarean delivery.     

The effect of nebulized lidocaine hydrochloride on emergence from sevoflurane anesthesia in children undergoing Tonsillectomy

BackgroundSevoflurane-related emergence agitation (EA) is considered a significant problem that interferes with children’s recovery; our aim was to evaluate the efficacy of nebulized lidocaine hydrochloride when given before sevoflurane anesthesia in attenuating EA in children undergoing tonsillectomy.Materials and methodsA randomized clinical study was conducted on eighty children ASA I and II who underwent tonsillectomy. The children were randomized to one of two groups according to the nebulizer contents. Lidocaine group (group L) received nebulized solution of 4 mg/kg lidocaine hydrochloride and placebo group (group P) received nebulized solution contains 0.9% normal saline.ResultsThe number of agitated patients were significantly lowered in the lidocaine group compared to the placebo group; p value (0.012).ConclusionThe use of nebulized lidocaine before sevoflurane anesthesia for pediatric patients undergoing tonsillectomy attenuated the sevoflurane-related EA with no side effects.     

Prévention de l’hypotension induite par la rachianesthésie au cours de la césarienne programmée : coremplissage par HEA 130/0,4 vs sérum salé isotonique

ObjectiveThe aim of this study was to compare the efficacy of HES 130/0.4 coloading compared to normal saline solution for prevention of hypotension during spinal anesthesia for elective caesarean section.Study designProspective, randomized.Patients and methodsOne hundred and twenty ASA I and II patients scheduled for elective caesarean section were recruited. Patients were randomized to receive either 500 mL of HES 130/0.4 (Voluven^®) coloading (Group V) or 500 mL of normal saline solution coloading (Group C). Spinal anesthesia technique and ephedrine administration were standardized in both groups. The primary endpoint was the incidence of maternal hypotension during spinal anesthesia for elective caesarean section.ResultsHypotension occurred in 43 patients in group C and 24 patients in group V (p = 0.001). Ephedrine consumption was significantly lower in group V (P = 0.005). Nausea, vomiting and headache incidence was higher in group C (p = 0.006). Apgar scores and umbilical blood gazes were comparable between groups.ConclusionHES 130/0.4 coload was more effective than normal saline solution to prevent hypotension following spinal anesthesia for elective cesarean section. HES 130/0.4 coload reduced the incidence, the duration of longest hypotension, the need for ephedrine and the adverse maternal effects.     

Mirtazapine premedication: Effect on preoperative anxiety and propofol dose requirements at different stages of hypnosis

BackgroundMirtazapine is an antidepressant drug that blocks central 5-HT2 receptors with anxiolytic and sleep-promoting effects and theoretically can be used as a premedication.MethodsSixty ASA I-II patients aged 25–50 yr were randomly allocated according to the premedication received 2 h before induction of anesthesia into two equal groups: group M patients received mirtazapine 30 mg tablet mixed with 20 ml of water and group P patients received 20 ml of plain water. Anxiety level was measured by visual analogue scale (VAS) and bispectral index (BIS) electrodes were connected before induction of anesthesia. Intravenous (i.v) infusion of propofol 1% at a rate of 300 ml h^?1 was started to induce hypnosis till a target BIS value of 45 (BIS45) is reached, and then endotracheal intubation is performed after fentanyl and cis-atracuruim being administered. Propofol dose requirements to achieve loss of response to verbal contact (RVC), loss of eyelash reflex (ELR), and a target BIS45 were recorded. Anesthesia was maintained with sevoflurane titrated to BIS value of 40–50 and oxygen/air mixture. Recovery time was recorded. In postanaesthesia care unit (PACU), VAS for pain and Ramsay sedation score were recorded. Patients were discharged from PACU when two consecutive Aldrete scores of 9 or 10 are obtained, and time of PACU stay was recorded.ResultsPreoperative anxiety by VAS and propofol doses required achieving loss of RVC and ELR, and target BIS45 were significantly lower in mirtazapine group. The two groups were comparable with regard to recovery and PACU stay times as well as postoperative pain and anxiety.ConclusionMirtazapine 30 mg oral tablets can be used as a premedication as it reduces preoperative anxiety and hypnotic dose requirements of propofol, and does not prolong recovery time.     

Preoperative paracetamol infusion reduces sevoflurane consumption during thyroidectomy under general anesthesia with spectral entropy monitoring

BackgroundIntravenous (IV) paracetamol has a significant opioid-sparing effect. We investigated the effect of paracetamol infusion on sevoflurane consumption during entropy monitored general anesthesia.MethodsSixty-two ASA I and II patients undergoing thyroidectomy under general anesthesia were included in a prospective, randomized, double-blind and placebo controlled study. The patients were randomized to receive a slow infusion of either 1 g paracetamol (paracetamol group, n = 31) or saline (control group, n = 31) just before induction of anesthesia. Sevoflurane concentration was titrated to keep the state entropy value between 40 and 50. End-tidal sevoflurane concentration, sevoflurane consumption, recovery characteristics, time to first analgesic request and meperidine consumption during the first 6 postoperative hours were recorded.ResultsThe mean ± SD estimated sevoflurane consumption was significantly lower in the paracetamol treated patients (36.2 ± 15 vs 44.9 ± 13.9 ml, in the control group; p = 0.021). Patients receiving paracetamol had a faster post-anesthetic recovery profile (extubation time, time to eye opening to command and time to state name and mention his/her home address) than the other group (p < 0.05). Mean ± SD time to first analgesic request was significantly prolonged in paracetamol group compared to control group (48.4 ± 14.0 vs 40.7 ± 11.5 min, respectively; p = 0.021). Meperidine consumption was higher in control group than in paracetamol group (28.7 ± 10.2 vs 23.1 ± 9.0 mg, respectively; p = 0.025).ConclusionPreoperative IV paracetamol infusion improved consumption and emergence from entropy monitored sevoflurane anesthesia with enhancement of the early postoperative analgesia.     

Bilateral sphenopalatine ganglion block as adjuvant to general anaesthesia during endoscopic trans-nasal resection of pituitary adenoma

BackgroundThis study was conducted to investigate the anaesthetic, vasodilator, and post-operative analgesic sparing effect of bilateral sphenopalatine ganglion block (SPGB) in patients undergoing endoscopic endo-nasal trans-sphenoidal surgery.MethodsThirty adult patients of ASA (I, II), aged 20–60 years, were randomly allocated to either the block group or the non-block group (n = 15, for each). After establishment of general anesthesia with sevoflurane and 100% oxygen, the patients received bilateral SPGB with 1.5 ml of either 0.5% bupivacaine (block group) or 0.9% NaCl (non-block group). Intra-operative mean arterial pressure (MAP) was maintained at 60–65 mmHg by using nitroglycerine. End-tidal sevoflurane concentration required to maintain bispectral index values (40–50) throughout the operation was recorded. Nitroglycerine and propranolol consumption, blood loss, recovery profile, perioperative catecholamines, post-operative pain and meperidine consumption were evaluated.ResultsBlock group showed significant decrease in sevoflurane and nitroglycerine consumption, blood loss, emergence time and time needed to achieve ?9 Aldrete score, P < 0.0001. All patients in non-blockade group (100%) were supplemented by nitroglycerine to achieve the target MAP versus 9 patients (60%) in the block group (P < 0.01). Propranolol administration was necessary in 9 patients (60%) in the non-block group versus 3 patients (20%) in the block group, P < 0.05. At PACU, visual analogue pain score and number of patients received meperidine analgesia were significantly less in the block group versus non-block group, P < 0.0001 and P < 0.001, respectively. Intra- and post-operative plasma epinephrine and nor-epinephrine levels were significantly higher in the non-block group than the block group, P < 0.05.ConclusionBilateral SPGB has anaesthetic, vasodilator and analgesic sparing effect when combined with general anaesthesia during endoscopic endo-nasal trans-sphenoidal resection of pituitary adenoma.     

Inhalation versus intravenous anaesthesia for adults undergoing on-pump or off-pump coronary artery bypass grafting: A systematic review and meta-analysis of randomized controlled trials

Study objectiveTo compare the use of inhalation versus intravenous anaesthesia for adults undergoing on-pump or off-pump coronary artery bypass grafting.DesignA systematic review.SettingA hospital-affiliated university.MeasurementsThe following databases were searched: the Cochrane Central Register of Controlled Trials (CENTRAL 2016, Issue 10), MEDLINE, EMBASE, and LILACS (from inception to October 2016). We used the GRADE approach to rate overall certainty of the evidence.ResultsIn total we included 58 studies with a total of 6105 participants. The methodological quality was difficult to assess as it was poorly reported in 35 included studies (three or more domains were rated as unclear risk of bias). Two trials of sevoflurane showed a statistically significant reduction in death within 180 to 365 days of surgery (on-pump) (RR 4.10, 95% CI 1.42 to 11.79; p = 0.009; I² = not applicable; high quality of evidence). There was also a statistically significant difference favouring sevoflurane compared to propofol on both inotropic (RR 2.11, 95% CI 1.53 to 2.90; p < 0.00001; I² = 0%) and vasoconstrictor support needed (RR 1.51, 95% CI 1.04 to 2.22; p = 0.03; I² = 0%) after coronary artery bypass grafting on-pump. Two trials of sevoflurane (MD − 0.22, 95% CI − 0.41 to − 0.03; p = 0.02; I² = 0%) and two further trials of desflurane (MD − 0.33, 95% CI − 0.45 to − 0.20; p < 0.00001; I² = 82%) showed a statistically significant difference on cardiac index during and after coronary artery bypass grafting on-pump, respectively.ConclusionsThere is high quality evidence that sevoflurane reduces death within 180 to 365 days of surgery and, inotropic and vasoconstrictor support compared to propofol for patients undergoing coronary artery bypass grafting. There is also some evidence showing that the cardiac index is minimally influenced by administration of sevoflurane and desflurane compared to propofol.     

Clonidine versus fentanyl as adjuvants to bupivacaine in peribulbar anesthesia

BackgroundPeribulbar anesthesia is widely practiced as a safe local block for cataract eye surgeries. Fentanyl has been used as an adjuvant to local anesthetics, prolonging their duration of action. Clonidine has been shown to increase the duration of analgesia and anesthesia produced by local anesthetics.Aim of the studyThe aim of this study was to compare the effect of fentanyl versus that of clonidine when used as adjuvants to bupivacaine in peribulbar block.MethodologyNinety patients, ASA physical status I–III, scheduled for cataract operations, under peribulbar block, were enrolled in the study and randomly assigned into 3 equal groups. Group F (n = 30) received a mixture of bupivacaine, hyaluronidase, and fentanyl; Group C (n = 30) received a mixture of bupivacaine, hyaluronidase, and clonidine; and in the control Group B (n = 30), a mixture of bupivacaine, hyaluronidase, and saline was used for peribulbar block. The onset, duration of globe anesthesia, akinesia, and lid akinesia were recorded. Intraoperative and postoperative patient comfort, first time to analgesic request, and any recorded complications due to drugs used were all assessed.ResultsGroups C and F showed significantly faster onset and longer duration of globe anesthesia, akinesia, lid akinesia, and the time to first analgesic request when compared to Group B (p < 0.001). The onset, of lid akinesia was significantly faster in Group C compared to Group B (p < 0.01). Group C showed a significantly longer duration of lid akinesia and globe akinesia compared to Group F (p < 0.01).ConclusionThe addition of either clonidine or fentanyl to the local anesthetic during peribulbar block results in a faster onset and longer duration of the block with a longer period of postoperative analgesia. The addition of clonidine was found to prolong the duration of the block more than fentanyl.     

Quality of recovery from anesthesia of patients undergoing balanced or total intravenous general anesthesia. Prospective randomized clinical trial

Study objectivesThe aim of the present study was to assess the quality of recovery from anesthesia of patients subjected to otorhinolaryngological (ORL) surgery under balanced or total intravenous general anesthesia by means of Quality of Recovery-40 (QoR-40) questionnaire.DesignProspective randomized clinical trial.SettingThe setting is at an operating room, a postoperative recovery area, and a hospital ward.PatientsOne-hundred thirty American Society of Anesthesiologists physical status I or II patients scheduled to undergo general anesthesia for ORL interventions under remifentanil, in combination with sevoflurane (balanced technique) or propofol (total intravenous anesthesia).MeasurementsOccurrence of nausea, vomiting, body temperature less than 36°C, and length of stay in the postanesthesia care unit were recorded. The QoR-40 was administered by an investigator blind to group allocation 24 hours after surgery. The quality of recovery, as assessed by the score on the QoR-40, was compared between the groups.Main resultsThere is no difference regarding the QoR-40 score among intravenous and inhalation anesthesia groups (190.5 vs 189.5, respectively; P = .33). Similarly, among the 5 dimensions of the QoR-40, the scores were comparable between the groups. Incidence of hypothermia (P = .58), nauseas or vomits (P = .39), and length of surgery (P = .16) were similar among groups. The evaluation of pain intensity (P = .80) and dose of morphine use in the postanesthesia care unit (P = .4) was also comparable between groups.ConclusionsThe quality of recovery from anesthesia assessed based on the patients' perception did not differ between the ones subjected to either inhalation or intravenous general anesthesia for ORL surgery based on QoR-40 questionnaire assessment.     

Effect of parecoxib on remifentanil induced postoperative shivering

Remifentanil based anesthesia was found to be associated with high incidence of postoperative shivering. This study was designed to evaluate the effect of preoperative administration of IV parecoxib sodium (a selective COX 2 inhibitor) on remifentanil induced shivering during the first 2 h following surgery.MethodIn a randomized, placebo-controlled, double blind study, sixty-seven patients with ASA physical status I, aged 20–60 years underwent elective lumber discectomy, were randomly allocated to receive either parecoxib sodium 40 mg IV (group P, n = 33) or saline IV (group S, n = 34) 30 min before induction of anesthesia which was induced with remifentanil 0.5 ug/kg/min, propofol, and cisatracurium and was maintained with remifentanil 0.1–0.3 ug/kg/min, sevoflurane, O₂/N₂O and cisatracurium. The incidence and grades of postoperative shivering were evaluated for 2 h.ResultsThe incidence of postoperative shivering was 36% in parecoxib group which was significantly less than that of saline group 64% (p < 0.05). Number of patients who developed grade 3 shivering, number of patients received meperidine to treat shivering and postoperative morphine requirement were significantly less in group P than that of group S (p < 0.05).ConclusionAdministration of parecoxib sodium 40 mg IV 30 min before induction of general anesthesia significantly reduced the incidence and severity of remifentanil induced shivering compared to placebo in patients underwent elective lumber discectomy under general anesthesia.     

Intrathecal vs intravenous magnesium as an adjuvant to bupivacaine spinal anesthesia for total hip arthroplasty

BackgroundThe aim of this study was to investigate the effect of intravenous infusion vs intrathecal magnesium sulfate during spinal anesthesia on postoperative pain, analgesic consumption, and intraoperative blood loss on patients undergoing total hip arthroplasty surgery.MethodsIn this prospective randomized controlled study, 75 adult patients, ASA physical status I and II scheduled for total hip arthroplasty, were included and randomized into three groups. Patients in Group I (control) received spinal anesthesia with hyperbaric bupivacaine and fentanyl. In Group II (IT Mg), 50 mg of magnesium sulfate was added to bupivacaine and fentanyl. In Group III (IV Mg), after induction of spinal anesthesia as in group I, a bolus dose of i.v. magnesium sulfate 40 mg kg^?1 was injected over 10 min, followed by continuous infusion of 15 mg kg^?1 h^?1 till the end of surgery. Arterial blood pressure, heart rate, electrocardiography, and O₂ saturation were continuously monitored. Onset, duration of sensory and motor block, and postoperative pain scores were assessed. Serum magnesium concentrations were checked before induction of anesthesia, immediately after surgery, at 6 h and 24 h after surgery. Total analgesic consumption and intraoperative blood loss were calculated.ResultsThere were no significant differences between the study groups in terms of onset time and maximum sensory level achieved, as well as onset and duration of motor block. Postoperative pain scores and 24 h analgesic consumption were lower in group II and III with insignificant differences between them. Intraoperative blood loss was significantly lower in group III. Postoperative Mg levels were higher in group III, without significant side effects.ConclusionsBoth i.v. infusion and intrathecal injection of Mg sulfate improved postoperative analgesia after total hip replacement. In addition, i.v. infusion of Mg sulfate reduced intraoperative blood loss.     

Efeito de diferentes doses de esmolol sobre a resposta hemodinâmica,BIS e resposta de movimento durante a intubação orotraqueal: estudo prospectivo,randômico e duplo‐cego

ObjectiveA prospective, randomized and double‐blind study was planned to identify the optimum dose of esmolol infusion to suppress the increase in bispectral index values and the movement and hemodynamic responses to tracheal intubation.Materials and methods120 patients were randomly allocated to one of three groups in a double‐blind fashion. 2.5 mg kg⁻¹ propofol was administered for anesthesia induction. After loss of consciousness, and before administration of 0.6 mg kg⁻¹ rocuronium, a tourniquet was applied to one arm and inflated to 50 mm Hg greater than systolic pressure. The patients were divided into 3 groups; 1 mg kg⁻¹ h⁻¹ esmolol was given as the loading dose and in Group Es50 50 μg kg⁻¹ min⁻¹, in Group Es150 150 μg kg⁻¹ min⁻¹, and in Group Es250 250 μg kg⁻¹ min⁻¹ esmolol infusion was started. Five minutes after the esmolol has been begun, the trachea was intubated; gross movement within the first minute after orotracheal intubation was recorded.ResultsIncidence of movement response and the ΔBIS max values were comparable in Group Es250 and Group Es150, but these values were significantly higher in Group Es50 than in the other two groups. In all three groups in the 1 st minute after tracheal intubation heart rate and mean arterial pressure were significantly higher compared to values from before intubation (p < 0.05). In the study period there was no significant difference between the groups in terms of heart rate and mean arterial pressure.ConclusionIn clinical practise we believe that after 1 mg kg⁻¹ loading dose, 150 μg kg⁻¹ min⁻¹ iv esmolol dose is sufficient to suppress responses to tracheal intubation without increasing side effects.     

A randomized comparative study between selective walking spinal anesthesia and general anesthesia for anorectal surgeries in outpatient settings

BackgroundSpinal anesthesia is gradually increasing in ambulatory setting. The limiting factor to the more widespread use of spinal anesthesia in the outpatient setting refers to the effect of residual block. Selective spinal anesthesia (SSA) with low dose lidocaine was compared with modern general anesthesia (GA) technique in day care anorectal surgeries.ObjectiveOur objectives in this study was to compare SSA with propofol and fentanyl based modern GA as regard to 1 – operating conditions 2 – patients’ and surgeon’s satisfaction, 3 – intraoperative, postoperative adverse events and 4 – recovery profiles in ambulatory anorectal surgeries.MethodsProspective randomized clinical study was conducted on 60 patients undergoing elective day case anorectal surgery. The patients were randomly allocated into one of two groups (GA and SSA groups) of 30 patients each. In GA group anesthesia was induced with intravenous fentanyl (2 μg/kg) and propofol (2–3 mg/kg). Airway was secured with I-gel supraglottic airway. Anesthesia was maintained by sevoflurane 1.5–2%, nitrous oxide 60% in oxygen mixture. SSA group patients received spinal anesthesia with lidocaine 20 mg and fentanyl 25 μg to a total volume of 3 ml with sterile water for injection. Intraoperative, postoperative and home adverse events, time to ambulate, time to home discharge, patients’ and surgeon’s satisfactions were statistically compared between both groups.ResultsBoth anesthetic techniques showed acceptable operating conditions and high rate of patients’ satisfaction. Low pain intensity, shorter time to ambulate and home discharge in SSA compared to GA with a p value < 0.001. Intraoperative hemodynamic stability was reported in both groups. No major postoperative or home adverse events in both groups.ConclusionsSSA with low dose lidocaine may be suitable alternative and competitive for modern GA in ambulatory anorectal surgery.