Prophylaxis for paediatric emergence delirium in desflurane-based anaesthesia: a network meta-analysis.

PURPOSE: The prevalence of postoperative emergence delirium in paediatric patients (pedED) following desflurane anaesthesia is considerably high at 50-80%. Although several pharmacological prophylactic strategies have been introduced to reduce the risk of pedED, conclusive evidence about the superiority of these individual regimens is lacking. The aim of the current study was to assess the potential prophylactic effect and safety of individual pharmacotherapies in the prevention of pedED following desflurane anaesthesia. METHODS: This frequentist model network meta-analysis (NMA) of randomized controlled trials (RCTs) included peer-reviewed RCTs of either placebo-controlled or active-controlled design in paediatric patients under desflurane anaesthesia. RESULTS: Seven studies comprising 573 participants were included. Overall, the ketamine + propofol administration [odds ratio (OR) = 0.05, 95% confidence intervals (95%CIs) 0.01-0.33], dexmedetomidine alone (OR = 0.13, 95%CIs 0.05-0.31), and propofol administration (OR = 0.30, 95%CIs 0.10-0.91) were associated with a significantly lower incidence of pedED than the placebo/control groups. In addition, only gabapentin and dexmedetomidine were associated with a significantly higher improvement in the severity of emergence delirium than the placebo/control groups. Finally, the ketamine + propofol administration was associated with the lowest incidence of pedED, whereas gabapentin was associated with the lowest severity of pedED among all of the pharmacologic interventions studied. CONCLUSIONS: The current NMA showed that ketamine + propofol administration was associated with the lowest incidence of pedED among all of the pharmacologic interventions studied. Future large-scale trials to more fully elucidate the comparative benefits of different combination regimens are warranted. TRIAL REGISTRATION: PROSPERO CRD42021285200.

A new formula to predict the size and insertion depth of cuffed nasotracheal tube in children receiving dental surgery: a retrospective study.

This retrospective study aimed to develop a new formula for selecting the appropriate size and determining the depth of the cuffed nasotracheal intubation (NTI) for a cuffed endotracheal tube (cETT) in pediatric patients undergoing dental surgery. In addition, the clinical data on cETT (i.e., the size and depth of insertion) was compared with those calculated with age-based formulas to evaluate their correlation. A total number of 684 patients who received NTI were enrolled (healthy group, n = 607; special-need group, n = 77). The ETT size used in real-world scenarios was smaller (i.e., about 0.5 and 0.94 mm) than the age-based formula, while the ETT depth was greater (i.e., about 1.5 cm) than the age-based formula in both groups. In the healthy group, age, gender, and body weight were identified as predictors of ETT size and depth through multiple linear regression analysis, while only age and body weight were predictors in the special-needs group. New formulas were developed based on these findings, with ETT size = 3.98 + 0.052 × age + 0.048 × gender (male = 1, female = 0) + 0.023 × body weight (kg) and ETT depth = 15.1 + 0.43 × age + 0.300 × gender (male = 1, female = 0) + 0.007 × body weight (kg). The new formula could be useful for both healthy and special-need pediatric populations undergoing dental procedures.

Effect of Intraoperative Phrenic Nerve Infiltration on Postoperative Ipsilateral Shoulder Pain After Thoracic Surgeries: A Systematic Review and Meta-Analysis of Randomized Controlled Studies.

OBJECTIVES: This meta-analysis was aimed at investigating the effectiveness and safety of phrenic nerve infiltration (PNI) against ipsilateral shoulder pain (ISP) after thoracic surgery. DESIGN: A systematic review and meta-analysis of randomized controlled trials (RCTs). SETTING: Operating room. PARTICIPANTS: Patients undergoing thoracic surgery. INTERVENTIONS: PNI. MEASUREMENTS AND MAIN RESULTS: MEDLINE, Cochrane Library, and EMBASE databases were searched from inception through December 2021. The primary outcome was the overall incidence of ISP, with secondary outcomes including incidence and severity of ISP at postoperative 6, 24, and 48 hours. Six RCTs involving 482 patients undergoing thoracic surgery were included. Pooled results found a significantly lower incidence of overall ISP in patients with PNI (ie, 23.6%) compared to those without (ie, 53.2%; risk ratio: 0.46, 95% confidence interval: 0.34-0.61; I2 = 19%; 6 RCTs; n = 474; certainty of evidence = high). At postoperative 6, 24, and 48 hours, there was also a significantly lower incidence of ISP in the PNI group than in the control group (certainty of evidence for all outcomes = high). Besides, the severity of ISP was lower in the PNI group at 6 (certainty of evidence = moderate) and 24 hours (certainty of evidence = high), with insufficient data for analysis at 48 hours because of only 1 trial. CONCLUSION: This meta-analysis showed that PNI not only reduced the incidence but also improved the severity of ipsilateral shoulder pain after thoracic surgery with a prophylactic effect lasting up to 48 hours. The limited number of included studies warrants further research to support these findings.

Analgesic Efficacy of Gabapentin and Pregabalin in Patients Undergoing Laparoscopic Bariatric Surgeries: a Systematic Review and Meta-analysis.

This meta-analysis investigated the effect of oral gabapentinoids (i.e., pregabalin and gabapentin) on analgesic consumption (i.e., primary outcome) and pain relief (i.e., secondary outcome) in patients following bariatric surgery. Analysis of five eligible trials published between 2010 and 2019 including 363 participants receiving gabapentinoids revealed a significantly lower morphine consumption [mean difference (MD) = - 15.1 mg, p = 0.004; evidence certainty: low] and risk of nausea/vomiting [risk ratio (RR) = 0.49, p = 0.002; evidence certainty: high] at postoperative 6-24 h. There was also a lower pain score at postoperative 0-4 h (MD = - 1.41, p < 0.00001; evidence certainty: low) and 6-12 h (MD = - 0.9, p = 0.007; evidence certainty: low) compared with controls, while pain severity at postoperative 24 h was comparable between two groups. In summary, preoperative oral gabapentinoids optimized postoperative pain outcomes and reduced risk of nausea/vomiting following bariatric surgery.

Selection of Optimal Functional Lymphatic Vessel Cutoff Size in Supermicrosurgical Lymphaticovenous Anastomosis in Lower Extremity Lymphedema.

BACKGROUND: Functional lymphatic vessels are essential for supermicrosurgical lymphaticovenous anastomosis. Theoretically, the larger the lymphatic vessel, the better the flow. However, large lymphatic vessels are not readily available. Since the introduction of lymphaticovenous anastomosis, no guidelines have been set as to how small a lymphatic vessel is still worthwhile for anastomosis. METHODS: In this longitudinal cohort study, unilateral lower limb lymphedema patients who underwent lymphaticovenous anastomosis between March of 2016 and January of 2019 were included. Demographic data and intraoperative findings including the number and size of lymphatic vessels were recorded. The cutoff size was determined by receiver operating characteristic curve analysis, based on the functional properties of lymphatic vessels. Clinical correlation was made with post-lymphaticovenous anastomosis volume measured by magnetic resonance volumetry. RESULTS: A total of 141 consecutive patients (124 women and 17 men) with a median age of 60.0 years (range, 56.7 to 61.2 years) were included. The cutoff size for a functional lymphatic vessel was determined to be 0.50 mm (i.e., lymphatic vessel0.5) from a total of 1048 lymphatic vessels. Significant differences were found between the number of lymphatic vessels0.5 anastomosed (zero to one, two to three, and greater than over equal to four lymphatic vessels0.5), the median post-lymphaticovenous anastomosis volume reduction (in milliliters) (p < 0.001), and the median percentage volume reduction (p = 0.012). CONCLUSIONS: Lymphatic vessel0.5 can be a valuable reference for lymphaticovenous anastomosis. Post-lymphaticovenous anastomosis outcome can be enhanced with the use of lymphatic vessel0.5 for anastomoses. CLINICAL QUESTION/LEVEL OF EVIDENCE: Risk, II.

Association of pharmacological prophylaxis with the risk of pediatric emergence delirium after sevoflurane anesthesia: An updated network meta-analysis.

STUDY OBJECTIVE: This updated network meta-analysis aims at exploring whether the concurrent use of midazolam or antiemetics may enhance the efficacy of other pharmacological regimens for delirium prophylaxis in pediatric population after general anesthesia (GA). DESIGN: Network meta-analysis (PROSPERO registration: CRD42020179483). SETTING: Postoperative recovery area. PATIENTS: Pediatric patients undergoing GA with sevoflurane. INTERVENTIONS: Pharmacological interventions applied during GA with sevoflurane. MEASUREMENTS: This network meta-analysis of randomized controlled trials (RCTs) was conducted with a frequentist model. PubMed, Embase, ProQuest, ScienceDirect, Cochrane CENTRAL, ClinicalKey, Web of Science, and ClinicalTrials.gov were searched from their inception dates to April 12, 2020, for RCTs of either placebo-controlled or active-controlled design containing information on the incidence of emergence delirium in pediatric patients undergoing sevoflurane anesthesia. MAIN RESULTS: Seventy studies comprising 6904 participants were included for the analysis of 30 pharmacological interventions. Based on surface under the cumulative ranking curve (SUCRA) analysis, midazolam was ranked the lowest in therapeutic effect (SUCRA: 20%), while antiemetics as a monotherapy had no effect on delirium prophylaxis. However, there was a trend that most combination therapies with midazolam or antiemetics were superior to monotherapies for delirium prophylaxis. Subgroup analyses based on age (i.e., ≤7 years) and a validated scoring system (i.e., the Pediatric Anesthesia Emergence Delirium scale) for delirium also suggested a better efficacy of combination therapies than monotherapies. Overall, combination therapies with midazolam or antiemetics did not have a negative impact on the incidence of postoperative nausea and vomiting, length of stay in the postanesthesia care unit, or time to extubation. The dexmedetomidine-midazolam-antiemetic combination was the most effective strategy for the prevention of emergence delirium. CONCLUSIONS: This network meta-analysis suggested that the incorporation of midazolam or antiemetics as adjuncts for combination therapies may have synergistic effects against pediatric postoperative emergence delirium. Future large-scale placebo-controlled RCTs are warranted to validate our findings.

Sevoflurane versus desflurane for early postoperative vomiting after general anesthesia in hospitalized adults: A systematic review and meta-analysis of randomized controlled trials.

STUDY OBJECTIVE: This systematic review and meta-analysis aimed at assessing the effects of two commonly used anesthetics in general anesthesia (GA), sevoflurane and desflurane, on early postoperative vomiting (POV) in hospitalized adults. DESIGN: Systematic review and meta-analysis of randomized controlled trials (RCTs). SETTING: Early postoperative vomiting after GA. PATIENTS: A total of 266 adult patients receiving inpatient surgeries under GA maintained with sevoflurane or desflurane. INTERVENTIONS: We searched PubMed, Medline, Cochrane Central Register of Controlled Trials, ScienceDirect, and Embase for eligible RCTs comparing postoperative outcomes following sevoflurane- or desflurane-maintained anesthesia. MEASUREMENTS: The primary outcome was early POV. Secondary outcomes included late POV, early and late postoperative nausea (PON), time to extubation, and emergence time. MAIN RESULTS: Eight trials were included. There was no significant difference in the risk of early POV (risk ratio [RR] 1.03, 95% confidence interval [CI] 0.64-1.64, p = 0.91). No significant difference in early PON was observed (RR 1.09; 95% CI, 0.77-1.56; p = 0.62). Nevertheless, the incidence of late POV and late PON were significantly lower in the sevoflurane group than that in the desflurane group (RR 0.47, 95% CI 0.23-0.94, p = 0.03; RR 0.45, 95% CI 0.24-0.84, p = 0.01, respectively). The extubation time was longer in the sevoflurane group than in the desflurane group (standardized mean difference [SMD] 0.56, 95% CI 0.14-0.97, p = 0.009). The emergence time of patients in the sevoflurane group was longer than that in those receiving desflurane (SMD 0.76, 95% CI 0.1-1.42, p = 0.02). CONCLUSIONS: Desflurane had the same effects on early POV and early PON as sevoflurane. However, the association between late POV and late PON with desflurane was stronger than that with sevoflurane if the effects of opioids were not considered. The desflurane group had shorter time to extubation and emergence time than the sevoflurane group. PROSPERO registration number: CRD42020218988.

Risk Factors of Postoperative Vomiting in the Eye of "Real-World Evidence"-Modifiable and Clinical Setting-Dependent Risk Factors in Surgical Trauma Patients.

Numerous studies on postoperative nausea and vomiting (PONV) have been carried out since the early days of contemporary surgery. The incidence of PONV has been greatly reduced in recent years and new drugs for PONV keep evolving in the market; however, a substantial number of patients are still under the threat of PONV. Female gender, non-smokers, a history of PONV/motion sickness, and postoperative opioid use are four well-recognized risk factors of PONV. Many potential risk factors reported in previous studies were not consistently presented as predictors for PONV. Two questions then arise; are risk factors clinical setting dependent and are risk factors modifiable? We attempted to answer the questions through a comprehensive review of perioperative records of surgical patients from the Trauma Department of our hospital. As nausea is subjective and no standard is applicable for its measurement, postoperative vomiting (POV) was used as an endpoint in this study. To the best of our knowledge, this is the first study to address the POV issue in surgical trauma patients. A total of 855 patients were enrolled in this study after excluding age below 20 years old, total intravenous anesthesia, desflurane anesthesia, or records with missing data. Our results showed that female gender (OR 4.89) is the strongest predicting factor, followed by a less potent predicting factor-more intraoperative opioid consumption (OR 1.07)-which favor more POV. More intraoperative crystalloid supply (OR 0.71) and a higher body weight (OR 0.9) favor less POV. Other potential risk factors did not reach statistical significance in this study as independent risk factors. Our results also showed that when the intraoperative crystalloid infusion rate is greater than 4 mL/kg/h (OR 0.20), it favors a lower rate of POV; when intraoperative opioid consumption is greater than 12 mg morphine equivalents, MME (OR 1.87), it favors a higher rate of POV. We concluded that dominance of any independent risk factor over other risk factors depends on how individual factors interact with the clinical setting. Some risk factors could be modified, and a cut-off value could be derived to facilitate a better plan for POV prevention.

Postoperative Vomiting Following Laparoscopic Cholecystectomy Is Associated with Intraoperative Fluid Administration: A Retrospective Cohort Study.

Potential risk factors for postoperative vomiting (POV) are important for daily anesthesia practice. To identify the risk factors associated with POV we retrospectively reviewed 553 adult patients who underwent scheduled simple laparoscopic cholecystectomy under sevoflurane-based general anesthesia between January and December 2018. Patients who experienced POV were predominantly women, had lower body weight, and higher ASA (American Society of Anesthesiologists) physical status. The POV group showed female sex predominance, lower body weight, and higher ASA physical status, with a significant difference when compared with the non-POV group. In univariate analysis, female sex and Apfel scores of 2, 3, and 4 were associated with a higher POV incidence. Age > 70 years, higher body weight, and ASA physical status III were associated with a lower POV incidence. In multivariate logistic regression, sex, age, Apfel score, and intraoperative crystalloid infusion rate were POV predictive factors. Receiver operating characteristic analysis showed a negative association between the intraoperative crystalloid infusion rate and POV occurrence with an area under the curve of 0.73 (p = 0.001). The cutoff intraoperative crystalloid infusion rate was 2 mL/kg/h with 82% sensitivity and 49% specificity (≥2 mL/kg/h was associated with a lower POV incidence vs. <2 mL/kg/h (OR, 95% CI; 0.52 [0.33-0.83])). To decrease POV in these patients, identifying high-risk factors and an intraoperative crystalloid administration of ≥2 mL/kg/h should be considered in patients undergoing LC under sevoflurane-based general anesthesia.

Efficacy and airway complications of Parker Flex-Tip tubes and standard endotracheal tubes during airway manipulation: A meta-analysis and trial sequential analysis.

BACKGROUND: Despite reported superior intubation outcomes associated with Parker Flex-Tip (PFT) tubes compared with those associated with standard polyvinylchloride tubes, the efficacy and safety of PFT tubes remain uncertain. OBJECTIVES: To compare the intubation outcomes between PFT and conventional standard polyvinylchloride tubes. DESIGN: Meta-analysis of randomised controlled trials. DATA SOURCES: Embase, Medline, Google Scholar, PubMed and the Cochrane controlled trials register from inception until 3 January 2021. ELIGIBILITY CRITERIA: All randomised trials comparing intubation outcomes between PFT (PFT group) and standard polyvinylchloride (standard polyvinylchloride group) tubes. RESULTS: Analysis of the 13 eligible trials showed no significant difference in successful first-attempt intubation rate [risk ratio (RR) 1.20, 95% confidence interval (CI) 0.99 to 1.44] (6 trials, 568 participants), trauma risk (RR 0.83, 95% CI 0.67 to 1.03) (5 trials, 501 participants) as well as the overall risks of epistaxis (RR 0.58, 95% CI 0.26 to 1.31) (3 trials, 262 participants), sore throat (RR 0.90, 95% CI 0.70 to 1.17) (4 trials, 451 participants) and hoarseness (RR 0.71, 95% CI 0.44 to 1.14) (4 trials, 451 participants) between the two groups. However, the intubation time was slightly shorter (weighted mean difference -4.2 s, 95% CI -7.4 to -1.0 s) (8 trials, 759 participants) and the risks of severe epistaxis (RR 0.15, 95% CI 0.03 to 0.84) (3 trials, 262 participants) and overall difficulty in airway manipulation (RR 0.48, 95% CI 0.29 to 0.80) (8 trials, 647 participants) were lower in the PFT group than those in the standard polyvinylchloride group. Trial sequential analysis conclusively confirmed a shorter intubation time with PFT tubes than with standard polyvinylchloride tubes, whereas other intubation outcomes were inconclusive. CONCLUSION: The use of PFT tubes for airway manipulation was associated with a shorter intubation time compared with the standard polyvinylchloride tubes. The results of trial sequential analysis suggest the need for further trials and meta-analysis to compare other intubation outcomes associated with the two devices. TRIAL REGISTRATION: PROSPERO CRD42020197670.

The Use of Propofol versus Dexmedetomidine for Patients Receiving Drug-Induced Sleep Endoscopy: A Meta-Analysis of Randomized Controlled Trials.

The sedation outcomes associated with dexmedetomidine compared with those of propofol during drug-induced sleep endoscopy (DISE) remains unclear. Electronic databases (i.e., the Cochrane controlled trials register, Embase, Medline, and Scopus) were searched from inception to 25 December 2020 for randomized controlled trials (RCTs) that evaluated the sedation outcomes with dexmedetomidine or propofol in adult patients diagnosed with obstructive sleep apnea (OSA) receiving DISE. The primary outcome was the difference in minimum oxygen saturation (mSaO2). Five RCTs (270 participants) published between 2015 and 2020 were included for analysis. Compared with dexmedetomidine, propofol was associated with lower levels of mSaO2 (mean difference (MD) = -7.24, 95% confidence interval (CI) -12.04 to -2.44; 230 participants) and satisfaction among endoscopic performers (standardized MD = -2.43, 95% CI -3.61 to -1.26; 128 participants) as well as a higher risk of hypoxemia (relative ratios = 1.82, 95% CI 1.2 to 2.76; 82 participants). However, propofol provided a shorter time to fall asleep and a lower risk of failed sedation compared with dexmedetomidine. No significant difference was found in other outcomes. Compared with propofol, dexmedetomidine exhibited fewer adverse effects on respiratory function and provided a higher level of satisfaction among endoscopic performers but was associated with an elevated risk of failed sedation.

A meta-analysis of randomized clinical trials on the impact of oral vitamin C supplementation on first-year outcomes in orthopedic patients.

This meta-analysis aimed at investigating the impact of oral vitamin C supplementation on the post-procedural recovery of orthopedic patients, including functional outcomes and complex regional pain syndrome type I (CRPS I). Literature search using the Medline, Cochrane Library, and Embase databases from inception till March 2021 identified seven eligible randomized controlled trials with 1,361 participants. Forest plot revealed no significant difference in the functional outcomes at 6-12 months [standardized mean difference (SMD) = -0.00, 95% CI - 0.19 to 0.18, 467 patients], risk of overall complications (RR = 0.98, 95% CI 0.68 to 1.39, 426 patients), and pain severity at 3-6 months (SMD = - 0.18, 95% CI - 0.49 to 0.12, 486 patients) between patients with and without oral vitamin C supplementation. Pooled analysis showed that vitamin C treatment reduced the risk of CRPS I regardless of dosage (RR = 0.46, 95% CI 0.25 to 0.85, 1143 patients). In conclusion, the current meta-analysis demonstrated that oral vitamin C supplementation may reduce the risk of complex regional pain syndrome type I but did not improve the functional outcomes in orthopedic patients. Nevertheless, because of the small number of trials included in the present study, further large-scale clinical studies are warranted to support our findings.

The effect of cricoid pressure on tracheal intubation in adult patients: a systematic review and meta-analysis.

PURPOSE: This meta-analysis aimed to assess the impact of cricoid pressure (CP) application on intubation outcomes. SOURCE: Electronic databases (i.e., MEDLINE, PubMed, Embase, and Cochrane review) were searched from inception to 2 June 2020 for randomized-controlled trials that assessed the intubation outcomes in adult patients using laryngoscopic approaches with and without the application of CP (i.e., CP vs non-CP group). The primary outcome was the successful first-attempt intubation rate (SFAIR), and the secondary outcomes were intubation time, incidences of poor laryngoscopic views (i.e., Cormack and Lehane grade 3-4), airway complications, and pulmonary aspiration. PRINCIPAL FINDINGS: A total of five trials (published from 2005 to 2018) were included, and all tracheal intubations were performed by anesthesiologists or nurse anesthetists with a video (n = 3) or Macintosh laryngoscope (n = 2) in the operating room. We found no significant difference in SFAIR (risk ratio [RR], 0.98; P = 0.37), incidence of poor laryngoscopic views (RR, 1.49; P = 0.21), and risk of sore throat (RR, 1.17; P = 0.73) between the two groups. Nevertheless, the intubation time on the first successful attempt was slightly longer (weighted mean difference = 4.40 sec, P = 0.002) and risk of hoarseness was higher (RR, 1.70; P = 0.03) in the CP group compared with in the non-CP group. The secondary outcome "pulmonary aspiration" was not analyzed because only one trial was available. CONCLUSION: The application of CP did not have a negative impact on the SFAIR or laryngoscopic view. Nevertheless, this maneuver may slightly prolong intubation time and increase the risk of postoperative hoarseness.

RéSUMé: OBJECTIF : Cette méta-analyse a pour but d'évaluer l'impact de l'application d'une pression cricoïdienne (PC) sur les résultats de l'intubation. SOURCE : Les bases de données électroniques (c.-à-d., MEDLINE, PubMed, Embase, et Cochrane review) ont été examinées de leur création jusqu'au 2 juin 2020 pour en tirer les études randomisées contrôlées évaluant les résultats d'intubation chez les patients adultes utilisant des approches laryngoscopiques avec ou sans application de PC (soit groupe PC et non-PC). Le critère d'évaluation principal était le taux d'intubations réussies à la première tentative, et les critères secondaires incluaient le temps d'intubation, l'incidence de mauvaises vues laryngoscopies (grades 3-4 de Cormack et Lehane), les complications au niveau des voies aériennes et l'aspiration pulmonaire. CONSTATATIONS PRINCIPALES : Cinq études au total (publiées entre 2005 et 2018) ont été incluses, et toutes les intubations trachéales ont été réalisées par des anesthésiologistes ou infirmiers anesthésistes à l'aide d'un vidéolaryngoscope (n = 3) ou d'une lame de Macintosh (n = 2) en salle d'opération. Nous n'avons trouvé aucune différence significative dans le taux d'intubations réussies à la première tentative (risque relatif [RR], 0,98; P = 0,37), dans l'incidence de mauvaises vues laryngoscopiques (RR, 1,49; P = 0,21) ou dans le risque de maux de gorge (RR, 1,17; P = 0,73) entre les deux groupes. En revanche, le temps d'intubation lors de la première tentative réussie était légèrement plus long (différence moyenne pondérée = 4,40 sec, P = 0,002) et le risque d'enrouement était plus élevé (RR, 1,70; P = 0,03) dans le groupe PC que dans le groupe non-PC. Le critère d'évaluation secondaire « aspiration pulmonaire ¼ n'a pas été analysé parce qu'une seule étude le mesurait. CONCLUSION : L'application de PC n'a pas eu d'impact négatif sur le taux d'intubations réussies à la première tentative ou la vue laryngoscopique. Par contre, cette manœuvre pourrait légèrement prolonger le temps d'intubation et augmenter le risque d'enrouement postopératoire.

Adverse respiratory events with sevoflurane compared with desflurane in ambulatory surgery: A systematic review and meta-analysis.

BACKGROUND: An increasing number of studies have concluded that the number of adverse events in the upper airway caused by desflurane does not differ significantly from the number of adverse events caused by sevoflurane. The advantages of desflurane in ambulatory surgery should be reassessed. OBJECTIVES: The aim of this study was to compare adverse respiratory events and recovery outcomes in patients undergoing desflurane or sevoflurane-based anaesthesia in ambulatory surgery. DESIGN: A systematic review and meta-analysis of randomised controlled trials (RCTs). DATA SOURCES: A systematic search for eligible RCTs in PubMed, Medline, Cochrane Central Register of Controlled Trials, ScienceDirect and Embase published up to June 2019. ELIGIBILITY CRITERIA: RCTs investigating the occurrence of adverse respiratory events, including airway irritation, stridor, coughing, respiratory distress and laryngospasm, emergence agitation, postoperative nausea and vomiting (PONV), time to eye opening and time to discharge from the operation room after desflurane or sevoflurane-based anaesthesia. RESULTS: Thirteen trials were included and analysed. A total of 634 patients were included in the desflurane group, and 633 patients in the sevoflurane group. The occurrence of respiratory complications was significantly higher with desflurane-based anaesthesia than with sevoflurane-based anaesthesia (Total n = 673, 20.0 vs. 12.8%, relative risk (RR) 1.59 (95% CI 1.15 to 2.20)) with low heterogeneity (I = 20%). There was no difference in the occurrence of emergence agitation (Total n = 626, 29.1 vs. 27.2%, RR 1.05 (95% CI 0.84 to 1.30)) or the incidence of PONV between the desflurane and sevoflurane groups (Total n = 989, 19.0 vs. 21.0%, RR 0.95 (95% CI 0.71 to 1.26)). Time to eye opening was significantly faster with desflurane than that with sevoflurane (Total n = 1072, mean difference = -3.32 min (95% CI -4.02 to -2.61)) with a substantial heterogeneity (I = 72.6%). There was no significant difference in the time to discharge from the operation room between the two groups (Total n = 1056, mean difference = -0.45 min (95% CI -5.89 to 4.99)). CONCLUSION: Despite recent reports that there is no significant difference in adverse respiratory events between desflurane and sevoflurane, a pooled analysis revealed that desflurane resulted in a higher rate than sevoflurane. Therefore, the consequences of desflurane should not be neglected and its airway irritant properties should be taken into account. TRIAL REGISTRATION: PROSPERO (CRD42019147939).

The Effect of Perioperative Vitamin C on Postoperative Analgesic Consumption: A Meta-Analysis of Randomized Controlled Trials.

Because the analgesic effect of vitamin C against acute pain remains poorly addressed, this meta-analysis aimed at investigating its effectiveness against acute postoperative pain. A total of seven randomized controlled trials with placebo/normal controls were identified from PubMed, Cochrane Library, Medline, Google Scholar, and Embase databases. Pooled analysis showed a lower pain score (standardized mean difference (SMD) = -0.68, 95% CI: -1.01 to -0.36, p < 0.0001; I2 = 57%) and a lower morphine consumption (weighted mean difference (WMD) = -2.44 mg, 95% CI: -4.03 to -0.86, p = 0.003; I2 = 52%) in the vitamin group than that in the placebo group within postoperative 1-2 h. At postoperative 24 h, a lower pain score (SMD = -0.65, 95% CI: -1.11 to -0.19, p = 0.005; I2 = 81%) and lower morphine consumption (WMD = -6.74 mg, 95% CI: -9.63 to -3.84, p < 0.00001; I2 = 85%) were also noted in the vitamin group. Subgroup analyses demonstrated significant reductions in pain severity and morphine requirement immediately (1-2 h) and 24 h after surgery for patients receiving intravenous vitamin C but not in the oral subgroup. These findings showed significant reductions in pain score and opioid requirement up to postoperative 24 h, respectively, suggesting the effectiveness of perioperative vitamin C use. Further large-scale trials are warranted to elucidate its optimal intravenous dosage and effectiveness against chronic pain in the postoperative pain control setting.

A novel algorithm to predict oxygen desaturation in sedated patients with obstructive sleep apnea utilizing polysomnography: A STROBE-compliant article.

This retrospective study aimed at identifying the predictors of oxygen desaturation (OD) (i.e., SpO2 < 95%) in patients with obstructive sleep apnea (OSA) requiring deep sedation and developing an algorithm to predict OD.We studied 66 OSA patients undergoing propofol-induced deep sedation for drug-induced sleep endoscopy (DISE). The patients were divided into prediction (n = 35) and validation (n = 31) groups. Patient characteristics and polysomnographic parameters were analyzed with receiver operating characteristic curve and Chi-squared test to identify significant predictors of OD for developing an algorithm in the prediction group. The predictive accuracy, sensitivity, positive predictive value, and negative predictive value of the algorithm were determined in the validation group.Six polysomnographic predictors of OD were identified, including Apnea-Hypopnea Index of total sleep time (AHI-TST), AHI at the stage of rapid eye movement (AHI-REM), percentage of time with oxygen saturation <90% (mO2 < 90%), average SpO2, lowest SpO2, and desaturation index. Stepwise multiple logistic regression analysis demonstrated that low average SpO2 (<95.05%) and high AHI-REM (>16.5 events/h) were independent predictors of OD. The algorithm thus developed showed that patients with an average SpO2 < 95.05% and those with an average SpO2 ≥ 95.05% together with an AHI-REM > 16.5 events/h would be at risk of OD under sedation. The predictive accuracy, sensitivity, positive predictive value, and negative predictive value were 84%, 100%, 83%, 100%, respectively.For patients with OSA, average SpO2 and AHI-REM may enable clinicians to predict the occurrence of oxygen desaturation under deep sedation. Future large-scale studies are needed to validate the findings.

Determining factors in relation to lymphovascular characteristics and anastomotic configuration in supermicrosurgical lymphaticovenous anastomosis - A retrospective cohort study.

INTRODUCTION: Supermicrosurgical lymphaticovenous anastomosis (LVA) can be performed in different configuration such as end-to-end (LVEEA), end-to-side (LVESA), and side-to-end (LVSEA). Each configuration has its own advantages and disadvantages. However, it has remained ambiguous as to which anastomotic o configuration to choose. The aim of this study is to analyze and compare the relative sizes of lymphatic vessel (LV) and recipient vein (RV), in attempts to provide the basis for proper selections of the anastomotic configuration. METHODS: From March 2016 to October 2018, 100 lymphedema patients with 103 lymphedematous lower limbs (stage I-III) were included. All patients underwent supermicrosurgical LVA. Demographic data and intraoperative findings, including the number and size of the LV/RV, the size discrepancies, and the numbers of LVA performed were recorded. The severity of LVs were classified based on the lymphosclerosis classification (s0, s1, s2, and s3). One-way ANOVA test and post hoc analysis with Bonferroni's correction were performed for size discrepancy analysis. RESULTS: A total 730 LVA were performed with 621 LVs and 468 RVs, averaging 7.1 LVA per limb. Of these, 367 (50.3%) were LVEEA, 333 (45.6%) were LVESA, and 30 (4.1%) were LVSEA. The average LV and RV size was 0.61 ± 0.35 mm and 0.87 ± 0.43 mm, respectively (p < 0.001). The average LV size in different configuration: LVEEA = LVESA < LVSEA (p < 0.001); The average RV size: LVEEA = LVSEA < LVESA (p < 0.001); The size discrepancy: LVESA > LVSEA > LVEEA (p < 0.001).The LVSEA group has more s1 lymphatic vessels as opposed to LVEEA and LVESA (p = 0.004). CONCLUSION: The size and the comparative discrepancy between the LVs and RVs are the determining factors for proper anastomotic configuration selection during LVA. LVESA was more frequently performed when vessel size discrepancy was larger. The efficacy of each anastomotic configuration has yet to be determined.

"A real-world evidence" in reduction of volatile anesthetics by BIS-guided anesthesia.

Many well-controlled clinical studies have shown that BIS-guided anesthesia could prevent intraoperative awareness and improve postoperative morbidity and mortality, by optimizing the amount of volatile anesthetics administered to patients. However, we questioned if the previously reported advantages of BIS-guided anesthesia in controlled studies would still apply in real-world settings. This retrospective study based on real-world settings clarified the role of BIS-guided anesthesia in reducing anesthetic consumption. We obtained anesthesia records from an electronic database of a medical center in southern Taiwan. A total of 6,713 cases were enrolled, where 1,324 cases receiving sevoflurane underwent BIS-guided anesthesia and 378 received desflurane; further, 3,819 receiving sevoflurane underwent standard anesthesia practice and 1,192 cases received desflurane. The median (25-75% interquartile values) of the average hourly consumption of sevoflurane or desflurane decreased significantly under BIS-guided anesthesia [10.5 (8.7-13.0) mL/h and 17.4 (13.7-21.1) mL/h, respectively] compared to that under standard anesthesia practice [11.4 (9.0-14.5) mL/h, and 20.2 (15.8-25.0), mL/h, respectively]. Furthermore, the average hourly consumption of these two volatile anesthetics varied inversely with age and anesthesia time in both groups. A significant reduction was found in the hourly consumption of volatile anesthetics in patients under BIS-guided anesthesia compared to standard anesthesia practice in different age groups or different anesthesia time. We concluded that BIS-guided anesthesia could reduce consumption of volatile anesthetics in real-world settings as well.

Myasthenic crisis and late deep vein thrombosis following thymectomy in a patient with myasthenia gravis: A case report.

INTRODUCTION: Surgical stress and pain are potential provoking factors for postoperative myasthenic crisis (POMC). We report the occurrence of early POMC and late deep vein thrombosis (DVT) in a man with myasthenia gravis (MG) undergoing thymectomy, addressing possible link between reversal of opioid overdose with naloxone and the triggering of POMC. PATIENT CONCERNS: A 71-year-old man with impaired renal function (ie, estimated glomerular filtration rate [egfr]: 49.1 mL/min/1.73 m) with diagnosis of MG made 2 months ago was scheduled for thymectomy. After uncomplicated surgery, he experienced opioid overdose that was treated with naloxone. Hyperlactatemia then developed with a concomitant episode of hypertension. Three hours after reversal, he suffered from myasthenic crisis presenting with respiratory failure and difficult weaning from mechanical ventilation. DIAGNOSIS: Stress-induced hyperlactatemia and subsequent myasthenic crisis INTERVENTIONS:: Pyridostigmine and immunosuppressive therapy with prednisolone were initiated. Hyperlactatemia subsided on postoperative day (POD) 5. Tracheal extubation was performed successfully on POD 6. OUTCOMES: During the course of hospitalization, his eGFR (ie, 88.9 mL/min/1.73 m) was found to improve postoperatively. After discharge from hospital, he developed DVT in the left femoral and popliteal veins on POD 24 when he was readmitted for immediate treatment with low-molecular-weight heparin. He was discharged without sequelae on POD 31. There was no recurrence of myasthenic crisis or DVT at 3-month follow-up. CONCLUSIONS: Following naloxone administration, hyperlactatemia may be an indicator of pain-related stress response, which is a potential provoking factor for myasthenic crisis. Additionally, patients with MG may have an increased risk of DVT possibly attributable to immune-mediated inflammation. These findings highlight the importance of perioperative avoidance of provoking factors including monitoring of stress-induced elevations in serum lactate concentration, close postoperative surveying for myasthenic crisis, and early recognition of possible thromboembolic complications in this patient population.