Early Childhood General Anesthesia and Neurodevelopmental Outcomes in the Avon Longitudinal Study of Parents and Children Birth Cohort

Neurodevelopment at 10 months and 2-3 years old after early and prolonged anaesthesia in infancy: General Anaesthesia & Brain Activity study (GABA) secondary analysis

Background

Effects of early and prolonged exposure to general anaesthesia on the developing brain are unclear. The study objective was to examine developmental outcomes at 10 months and 2-3 yr of age after general anaesthesia planned for >2 h in the first 2 months of life.

Methods

This is a secondary analysis of the General Anaesthesia & Brain Activity (GABA) study-a prospective, single-centre, longitudinal observational study. The final dataset included 59 children who were unexposed and 31 children who were exposed to early prolonged general anaesthesia who completed the primary outcome measure, Bayley Scales of Infant and Toddler Development-III (BSID) assessments at 10 months, at 2-3 yr old, or both. Analyses used adjusted Welch's t-tests, linear regression, and linear mixed effects models.

Results

BSID composite scores for cognition were similar between general anaesthesia and unexposed cohorts at 10 months (P adj=0.566, standardised mean difference [SMD]=0.27) and at 2-3 yr (P adj=0.651, SMD=0.25). Motor and language scores were similar between cohorts at 10 months (motor: P adj=1, SMD=0.13; language: P adj=0.806, SMD=0.19) and fell within typical reference ranges. Linear regression analysis found no association between BSID cognition scores and cumulative hours of general anaesthesia at 10 months (R=0.06, P=0.635) or at 2-3 yr (R=-0.13, P=0.293).

Conclusions

Children with early prolonged general anaesthesia showed BSID scores comparable to age-matched controls. This analysis provides additional preliminary support for the safety of general anaesthesia on the developing brain even when general anaesthesia is prolonged, repeated, or administered very early in life.

Astragalin-functionalized ultrasmall nanoparticles modulate the complement pathway to inhibit microglial synaptic phagocytosis for reducing anesthetic neurotoxicity

Synaptic impairment is identified as a primary pathology in sevoflurane-induced neurotoxicity, contributing to neurobehavioral and neurodevelopmental deficits. Synaptic loss in neurons occurs through microglia-mediated synaptic phagocytosis via the complement pathway. Astragalin, a natural flavonoid compound, exhibits diverse bioactivities, such as anti-tumor, anti-complement, and anti-inflammatory effects. Herein, astragalin-functionalized Cu 2-x Se nanoparticles (CSPA NPs) can effectively inhibit the complement pathway, mitigating microglia-mediated synaptic phagocytosis and promoting synaptic restoration to repair sevoflurane-induced neurotoxicity. They efficiently target and reduce microglial activation and phagocytosis. By downregulating sortilin, CSPA NPs increase progranulin expression, promoting TFEB cytoplasmic translocation to decrease lysosomal activity and microglial phagocytosis. Furthermore, CSPA NPs decrease complement C1q and C3 levels, inhibiting microglial synaptic engulfment and ameliorating cognition dysfunction in sevoflurane-treated mice. This study illustrates that CSPA NPs inhibit microglial synaptic elimination via the complement pathway, alleviating sevoflurane-induced neurotoxicity and providing insights into treating complement pathway-related diseases.

Triiodothyronine ameliorates S-ketamine-induced hypomyelination via the PPARα pathway in neonatal rat

Growing evidence suggests that prolonged or repeated exposure to general anesthesia is associated with white matter alteration in children, which may underlie subsequent cognitive and behavioral abnormalities. Numerous infants undergo anesthesia for surgery each year, so it is imperative to identify the risk factors and find preventative treatment to prevent the effects of early anesthesia exposure. Thyroid hormones play a pivotal role in the process of myelination of white matter. Clinical studies have shown that thyroid hormone levels are decreased after infant surgery, whether thyroid hormone supplementation can prevent long-term toxicity of anesthesia remains to be elucidated. Here we used S-ketamine, an anesthetic drug commonly used in pediatric anesthesia, to investigate changes in thyroid hormones after anesthesia and their effects on myelin development. Our findings showed a significant decrease in thyroid hormones following S-ketamine anesthesia. The administration of triiodothyronine (T3) supplements ameliorated the S-ketamine-induced impairments in motor coordination and myelination. S-ketamine-induced hypothyroidism predominantly affects the differentiation of OPCs to mature oligodendrocytes. Further analysis revealed significant alterations in lipid metabolism, and we observed that S-ketamine inhibited PPARα in OPCs. Treatment with T3 effectively rescued S-ketamine-induced suppression of PPARα. The protective effects of T3 were significantly compromised by the PPARα inhibitor GW6471. The pharmacological activator of PPARα, fenofibrate, rescued the motor coordination deficits and the inhibition of OPC maturation induced by S-ketamine. In conclusion, our study demonstrates that S-ketamine anesthesia induces the decline of thyroid hormone and hypomyelination in neonatal rats. Administration of T3 ameliorates S-ketamine-induced hypomyelination through the PPARα signaling pathway.

Anesthesia, extremely premature infants and full-scale intelligence quotient at 5 years of age

BACKGROUND

To determine the association between exposure to Food and Drug Administration (FDA) warned anesthetics in premature infants and their full-scale intelligence quotient (FSIQ) score at 5 years of age.

METHODS

Premature infants born <27 weeks gestational age (GA) between January 2006 and December 2012 with FDA anesthetic exposure status were included. Exposures included volatile anesthetics, propofol, benzodiazepines, ketamine, chloral hydrate, and barbiturates/phenobarbital. Exposure was treated as a binary variable with infants stratified into those who were or were not exposed to any FDA warned drug. Associations were explored using univariable and multivariable regressions.

RESULTS

238 (61.5%) of 387 eligible infants had available FSIQ scores. Of these, 110 (46.2%) were exposed to warned anesthetics. Unadjusted and adjusted imputed case associations (95% CI) between FDA warned anesthetics and FSIQ were -5 (-10 to -2, p = 0.014) and -2 (-7 to 3, p = 0.528) points. An unobserved confounder(s) the strength of severe IVH [-9 points (-15 to -3)] would be required to overturn the directional association between FDA exposure and FSIQ in our complete case model.

CONCLUSION

Premature infants exposed to anesthetics flagged by the FDA showed no significant reduction in FSIQ at 5 years of age.

IMPACT

It is unclear whether early exposure to anesthetics in premature infants born <27 weeks gestation is associated with full-scale intelligence quotient (FSIQ) at 5 years of age. Our retrospective cohort study included 387 premature infants born <27 weeks gestational age. FSIQ scores were available for 238/387 at 5 years of age of which 110 were exposed to Food and Drug Administration (FDA) warned anesthetic drugs. After missing data imputation and adjustment for maternal and neonatal characteristics, no significant associations were found between FDA warned anesthetic exposure and FSIQ. No adjusted volatile anesthetic or opioid dosage effect was associated with FSIQ.

Safety profiles of sevoflurane in pediatric patients: a real-world pharmacovigilance assessment based on the FAERS database

Objective

This study aimed to evaluate the safety profile of sevoflurane in pediatric populations using real-world data.

Methods

Data were extracted from the Food and Drug Administration Adverse Event Reporting System (FAERS) from the first quarter of 2004 to the third quarter of 2024. We analyzed reports where sevoflurane was the primary suspect in individuals aged 0-18, employing disproportionality analysis to detect adverse events associated with sevoflurane. We also compared the adverse events related to sevoflurane between pediatric and adult populations.

Results

The FAERS database yielded 21,838,627 adverse event reports for children, with 474 involving sevoflurane as the primary suspect. Descriptive analysis revealed a majority of reports from male patients, primarily reported by physicians. Disproportionality analysis identified significant System Organ Classes (SOC) signals associated with sevoflurane, meeting four detection criteria, including "Cardiac disorders," "Respiratory, thoracic, and mediastinal disorders," and "Vascular disorders." The study also identified previously unreported adverse events, such as "Encephalopathy" and "Hypercapnia." Notable differences in signals were observed between children and adults for "Pulmonary alveolar hemorrhage," "Anaphylactic shock," and "Hypotension."

Conclusion

Our analysis of the FAERS database identified several significant adverse events associated with sevoflurane in pediatrics, affecting the cardiovascular, respiratory, and nervous systems. Differences in adverse event signals between children and adults were also observed. Furthermore, the new adverse events (such as encephalopathy and hypercapnia) indicated that anesthesiologists should be more vigilant in administering sevoflurane.

Regulatory mechanism of LncRNA GAS5 in cognitive dysfunction induced by sevoflurane anesthesia in neonatal rats

BACKGROUND AND OBJECTIVES

Sevoflurane (Sev) exposure may provoke deleterious effects on cognitive function. This study explores the mechanism of long non-coding RNA growth arrest specific transcript 5 (LncRNA GAS5) in Sev-induced cognitive dysfunction in neonatal rats.

METHODS

Cognitive dysfunction was induced by Sev anesthesia in 7-day-old Sprague-Dawley rats, followed by open field test, novel object recognition, radial arm maze, and Morris water maze to evaluate cognitive function of rats. The subcellular localization of LncRNA GAS5 was detected by nucleocytoplasmic isolation assay, and the binding of miR-137 to LncRNA GAS5 and NKCC1 was detected by RNA pull down and dual-luciferase reporter assay, respectively. Adenovirus-packaged sh-LncRNA GAS5 was injected into the hippocampus of Sev rats. qRT-PCR and Western blot were performed to detect the expressions of LncRNA GAS5, miR-137 and NKCC1 in the hippocampus of rats.

RESULTS

Sev anesthesia led to cognitive dysfunction in neonatal rats. LncRNA GAS5 was highly expressed in Sev rats, and inhibition of LncRNA GAS5 alleviated Sev-induced cognitive dysfunction in rats. LncRNA GAS5 targeted miR-137, and miR-137 inhibited NKCC1 expression. Knockdown of miR-137 or overexpression of NKCC1 reversed the effect of LncRNA GAS5 inhibition on cognitive dysfunction in sev rats.

CONCLUSION

LncRNA GAS5 promotes Sev-induced cognitive dysfunction in neonatal rats via the miR-137/NKCC1 axis.

Pediatric laparoscopic versus percutaneous gastrostomy tube placement: a single-center review

BACKGROUND

The optimal technique for gastrostomy tube (GT) placement in pediatric patients remains controversial. Percutaneous endoscopic gastrostomy (PEG) was the preferred approach over open gastrostomy. With the advent of laparoscopy, many advocate for laparoscopic (LAP) placement to avoid potential visceral injury. Additionally, PEG patients may undergo an additional procedure for conversion to a low-profile button. We sought to compare outcomes including complications, need for subsequent procedures, and anesthesia exposure in LAP vs. PEG patients.

METHODS

Patients (ages 0-18) who underwent GT placement at our pediatric healthcare system between 2018 and 2021 were retrospectively reviewed. Patients were excluded if they underwent fundoplication, gastro-jejunostomy tube placement, open placement, tube placement in concurrence with other intestinal procedures, or failed primary attempt at gastrostomy placement. Data related to demographics and GT placement were recorded. Our primary outcomes were complications, need for subsequent procedures, discrete anesthesia exposures, and cumulative anesthesia exposure. The Wilcoxon rank sum test, Pearson's Chi-squared test, and Fisher's exact test were used to compare characteristics and clinical measurements between PEG and LAP patients.

RESULTS

Six hundred and eighty-eight (688) patients underwent GT placement during the study period, 234 (34.0%) LAP and 454 (66.0%) PEG. LAP patients were younger and weighed less than PEG patients (p = 0.005 and p = 0.002, respectively). Gender distribution, primary insurance status, and ASA (American Society of Anesthesiologists) classification were similar. Within the group excluded, 5 failed PEG placements, while 0 failed LAP GT attempts (p = 0.173). Major complication rates were comparable (1.3% vs. 2.4%, p = 0.401); however, PEG patients were more likely to have skin erythema/local infection (p = 0.006). PEG patients tended toward undergoing subsequent procedures (10.9% vs. 6.5% for LAP, p = 0.061) such as GT revision or conversion to gastro-jejunostomy tube. Additionally, 60.5% of PEG patients required > 2 anesthesia events, most often due to exchange of PEG to a low-profile button, while 93.6% of LAP patients required only one (p < 0.001). Finally, the median total general anesthesia exposure for the PEG group was 75 min (IQR 53-97) and 79 (IQR 67-98) in the LAP group (p = 0.002).

CONCLUSION

PEG technique is associated with more discrete anesthesia exposures and may also require more subsequent operations related to its placement. However, at our institution, overall major complications are similar in both techniques, while PEG tubes are prone to skin erythema/local infection.

LEVEL OF EVIDENCE

Retrospective Comparative Study, Level III.

Brain health: A concern for anaesthesiologists and intensivists

Damage to the brain can have disastrous and long-lasting consequences. The European Society of Anaesthesiology and Intensive Care (ESAIC) is aware of the importance of taking good care of the brain, both of patients and of anaesthesia and intensive care unit (ICU) caregivers, and has organised a complete learning track on brain health to bring this concern to the attention of practitioners. This learning track included an online Focus Meeting on Brain Health (November 25, 2023). We here provide readers with a digest of the information that was delivered during that meeting in an opinion paper driven by the authors' own reading of the literature. It is divided according to the meeting's sessions, including how to improve the health of an injured brain, how to keep a young or old brain healthy, how to keep a healthy adult brain unimpaired, how monitoring can impact brain health in the operating room and in the intensive care unit, and how to keep the anaesthesia and ICU caregivers' brain healthy. Each part is a brief and focused summary. The main delivered messages are that the management of injured brain patients involves an adequate choice of sedation, adequate brain monitoring, and focused attention to specific points depending on the underlying pathology; that several measures can be undertaken to protect the brain of the very young needing anaesthesia; that it is possible to detect older patients at risk of postoperative neurocognitive disorders, and that dedicated perioperative management by a multidisciplinary expert team may improve their outcomes; that apparently healthy adult brains may suffer during anaesthesia; that the electroencephalogram may track peri-operative brain dysfunction, and that female patients should be given special care in this respect; that multimodal brain monitoring helps to detect pathological processes and to maintain brain homeostasis; and that burnout in anaesthesiologists can be effectively fought using personal, organisational, managerial and legal approaches.

Neonatal anesthesia with remimazolam Reduces the expression of synaptic proteins and increases depressive behavior in adult mice

The demand for pediatric anesthesia has risen in decades, raising concerns about the neurotoxic potential of anesthetics like remimazolam, which may impact neurodevelopment and later cognitive function. This study utilized a neonatal mouse model to assess remimazolam's neurodevelopmental effects. Results indicate that remimazolam-exposed mice displayed cognitive impairment and depressive behaviors in adulthood. Acute reductions in synaptic protein expression post-anesthesia were observed, along with long-term decreases in hippocampal choline acetyltransferase levels, reduced dendritic spine density in the CA1 region, and microglial proliferation. Collectively, these findings suggest that remimazolam can induce neurotoxicity and neuroinflammation, leading to synaptic dysfunction and associated cognitive and behavioral deficits.

The Relationship between Early Exposure to General Anesthesia and Neurobehavioral Deficits

BACKGROUND

In contemporary medical practice, general anesthesia plays an essential role in pediatric surgical procedures. While modern anesthetic protocols have demonstrated safety and efficacy across various pathological conditions, concerns persist regarding the potential neurotoxic effects associated with early exposure to general anesthesia.

SUMMARY

Current research primarily examines the neurocognitive developmental impacts, with limited focus on neurobehavioral developmental disorders. This review presents a comprehensive analysis of clinical trial results related to five critical neurobehavioral developmental disorders: fine motor disability, attention-deficit hyperactivity disorder, impulse control disorders, autism spectrum disorder, and developmental coordination disorder. Furthermore, this review synthesizes insights from basic research on the potential toxicological mechanisms of general anesthetic agents that could influence clinical neurobehavioral changes. These findings provide valuable guidance for the prudent and safe utilization of anesthetic agents in pediatric patients.

KEY MESSAGES

This review explores the potential connections between general anesthesia and five neurobehavioral disorders, highlighting the importance of cautious anesthetic use in children in light of current research findings.

General Anesthesia Exposure in Infancy and Childhood: A 10-year Bibliometric Analysis

PURPOSE

Heated discussions have divided health care providers and policymakers on the risks versus benefits of general anesthesia in pediatric populations. We conducted this study to provide a comprehensive bibliometric analysis of general anesthesia in this specific population over the past decade.

DESIGN

We summarized and quantitatively analyzed the studies related to general anesthesia in children and infants over the past decade.

METHODS

Using the Web of Science Core Collection as the data source, we analyzed the literature using CiteSpace software, focusing on authors, countries, institutions, keywords, and references to identify hotspots and predict research trends.

FINDINGS

A total of 2,364 publications on pediatric anesthesia were included in the analysis. The number of related publications and citations steadily increased from 2013 to 2022. The United States was the leading country in terms of output, and University of Toronto was the primary contributing institution. Co-citation analysis revealed that over the past decade research has mainly focused on the long-term adverse effects of general anesthesia on neurodevelopment and acute perioperative crisis events. Keyword analysis identified infant sedation and drug selection and compatibility as promising areas for development. In addition, improving the quality of perioperative anesthesia will be a major research focus in the future.

CONCLUSIONS

Recent research in pediatric anesthesia has focused on mitigating the adverse effects of general anesthesia in infants and young children and studying the pharmacological compatibility of anesthetics. Our study results would assist researchers and clinicians in understanding the current research status and optimizing clinical practice in this field.

Bilateral cataract surgery in children: immediate sequential versus delayed sequential surgery

PURPOSE

To compare ocular and anesthesia-related complications in a cohort of patients having undergone either delayed sequential bilateral cataract surgery (DSBCS) or immediate sequential bilateral cataract surgery (ISBCS).

METHODS

The medical records of children who underwent bilateral cataract surgery at our institution between 2012 and 2021were reviewed retrospectively. Included patients were 0-24 months of age, aphakic, and followed for at least 1 year after surgery.

RESULTS

A total of 56 children were included: 23 underwent ISBCS; 33, DSBCS. Mean age at surgery was 2.6 ± 2.5 months for ISBCS patients and 2.8 ± 3.0 months for DSBCS patients (P = 0.752). Association with systemic diseases was more common in the ISBCS group. The mean anesthesia time per child was shorter in the ISBCS group (P < 0.001), although the mean total procedure time was similar in both groups. The rate of intraoperative anesthesia-related complications and intraocular complications was similar in both groups. There were no cases of endophthalmitis. The mean number of additional surgical interventions per child and the mean number of follow-up visits within 1 year were similar between groups. Children in the ISBCS group required fewer nights of hospital admission (P < 0.001).

CONCLUSIONS

ISBCS in children in this series did not lead to an increased incidence of ocular or anesthesia-related complications compared with DSBCS. ISBCS avoids repeated anesthesia and shortens the total time that the child is under anesthesia.

Comparing Healthcare Needs in Extremely Low Birth Weight Infants With NEC and Spontaneous Intestinal Perforation

BACKGROUND

Necrotizing enterocolitis (NEC) and spontaneous intestinal perforation (SIP) affect 6-8% of extremely low birth weight (ELBW) infants. SIP has lower mortality than NEC, but with similar short-term morbidity in length of stay, growth failure, and supplemental oxygen requirements. Comparative long-term neurodevelopmental outcomes have not been clarified.

METHODS

Data were prospectively collected from 59 North American neonatal units, regarding ELBW infants (401-1000 g or 22-27 weeks gestational age) born between 2011 and 2018 and evaluated again at 16-26 months corrected age. Outcomes were collected from infants with laparotomy-confirmed NEC, laparotomy-confirmed SIP, and those without NEC or SIP. The primary outcome was severe neurodevelopmental disability. Secondary outcomes were weight <10th percentile, medical readmission, post-discharge surgery and medical support at home. Adjusted risk ratios (ARR) were calculated.

RESULTS

Of 13,673 ELBW infants, 6391 (47%) were followed including 93 of 232 (40%) with NEC and 100 of 235 (42%) with SIP. There were no statistically significant differences in adjusted risk of any outcomes when directly comparing NEC to SIP (ARR 2.35; 95% CI 0.89, 6.26). However, infants with NEC had greater risk of severe neurodevelopmental disability (ARR 1.43; 1.09-1.86), rehospitalization (ARR 1.46; 1.17-1.82), and post-discharge surgery (ARR 1.82; 1.48-2.23) compared to infants without NEC or SIP. Infants with SIP only had greater risk of post-discharge surgery (ARR 1.64; 1.34-2.00) compared to infants without NEC or SIP.

CONCLUSIONS

ELBW infants with NEC had significantly increased risk of severe neurodevelopmental disability and post-discharge healthcare needs, consistent with prior literature. We now know infants with SIP also have increased healthcare needs.

LEVELS OF EVIDENCE

Level II.

Unveiling the hidden dangers: a review of non-apoptotic programmed cell death in anesthetic-induced developmental neurotoxicity

Anesthetic-induced developmental neurotoxicity (AIDN) can arise due to various factors, among which aberrant nerve cell death is a prominent risk factor. Animal studies have reported that repeated or prolonged anesthetic exposure can cause significant neuroapoptosis in the developing brain. Lately, non-apoptotic programmed cell deaths (PCDs), characterized by inflammation and oxidative stress, have gained increasing attention. Substantial evidence suggests that non-apoptotic PCDs are essential for neuronal cell death in AIDN compared to apoptosis. This article examines relevant publications in the PubMed database until April 2024. Only original articles in English that investigated the potential manifestations of non-apoptotic PCD in AIDN were analysed. Specifically, it investigates necroptosis, pyroptosis, ferroptosis, and parthanatos, elucidating the signaling mechanisms associated with each form. Furthermore, this study explores the potential relevance of these non-apoptotic PCDs pathways to the pathological mechanisms underlying AIDN, drawing upon their distinctive characteristics. Despite the considerable challenges involved in translating fundamental scientific knowledge into clinical therapeutic interventions, this comprehensive review offers a theoretical foundation for developing innovative preventive and treatment strategies targeting non-apoptotic PCDs in the context of AIDN.

The duration-dependent and sex-specific effects of neonatal sevoflurane exposure on cognitive function in rats

Clinical studies have found that neonatal sevoflurane exposure can increase the risk of cognitive dysfunction. However, recent studies have found that it can exhibit neuroprotective effects in some situations. In this study, we aimed to explore the effects of sevoflurane neonatal exposure in rats. A total of 144 rat pups (72 males and 72 females) were assigned to six groups and separately according to sevoflurane exposure of different times on the seventh day after birth. Blood gas analysis and western blot detection in the hippocampus were conducted after exposure. The Morris water maze test was conducted on the 32nd to 38th days after birth. The expression of PSD95 and synaptophysin in the hippocampus was detected after the Morris water maze test. We found that neonatal exposure to sevoflurane promoted apoptosis in the hippocampus, and Bax and caspase-3 were increased in a dose-dependent manner. The 2-h exposure had the greatest effects on cognitive dysfunction. However, with the extension of exposure time to 6 h, the effects on cognitive function were partly compensated. In addition, sevoflurane exposure decreased synaptogenesis in the hippocampus. However, as the exposure time was extended, the suppression of synaptogenesis was attenuated. In conclusion, neonatal sevoflurane exposure exhibited duration-dependent effects on cognitive function via Bax-caspase-3-dependent apoptosis and bidirectional effects on synaptogenesis in rats.

Early childhood general anesthesia and risk of Attention Deficit Hyperactivity Disorder

BACKGROUND

The relationship between early childhood exposure to general anesthesia (GA) and the risk of developing Attention Deficit Hyperactivity Disorder (ADHD) is still uncertain and previous studies have presented conflicting results. This population-based cohort study aimed to investigate the potential relationship between GA exposure and ADHD risk using propensity score matching (PSM) in a large sample size.

METHODS

The study included 15,072 children aged 0-3 years who received GA and were hospitalized for more than 1 day in Taiwan from 2004 to 2014. The nonexposed group was randomly selected through 1:1 PSM from the Taiwan Maternal and Child Health Database (TMCHD). The primary objectives of this study were to determine the incidence rates (IR) and incidence rate ratios (IRR) of ADHD in the two cohorts, employing Poisson regression models.

RESULTS

The GA group and non-GA group each comprised 7,536 patients. The IR of ADHD was higher in the GA group (122.45 per 10,000 person-years) than in the non-GA group (64.15 per 10,000 person-years), and the IRR of ADHD in the GA group was 1.39 (95% CI: 1.26, 1.55). The study found that the number of times of exposure to GA, duration of exposure, male gender, and central nervous system surgery were significant risk factors for ADHD in the future.

CONCLUSIONS

This study's findings suggest that there is a significant correlation between early childhood exposure to GA and the risk of developing ADHD, and GA may be an important risk factor for ADHD in children undergoing surgery. The study also identified several risk factors for ADHD, including the number of times of exposure to GA, duration of exposure, male gender, and central nervous system surgery.

Proteomic analysis of gene expression in the prefrontal cortex in infant rhesus macaques after multiple sevoflurane exposures

PURPOSE

Repeated exposure of infant rhesus macaques to sevoflurane induces neurotoxicity and is associated with neurocognitive impairment in later life. We aimed to investigate the effect of repeated sevoflurane exposure on the expression of proteins in the prefrontal cortex of infant rhesus macaques by proteomics.

METHODS

Rhesus macaques were exposed to sevoflurane three times, on postnatal days 7, 21 and 35. Quantitative proteomics employing LC-MS with isobaric labeling (TMT10plex), western blotting, and transmission electron microscopy (TEM) were utilized in the studies.

RESULTS

The results of a proteomics investigation of the brain revealed that the proteins that were differentially expressed in rhesus macaques after sevoflurane exposures were associated mainly with mitochondrial respiration. Following multiple sevoflurane exposures, the prefrontal cortices of rhesus macaques exhibited increases in NDUFA8 and COX IV protein levels, while no alterations in mitochondrial morphology were observed through TEM.

CONCLUSION

Multiple exposures to sevoflurane increased the mitochondrial protein levels in rhesus macaques.

Early Neurodevelopmental Outcomes Following Exposure to General Anesthesia in Infancy: EGAIN, a Prospective Cohort Study

BACKGROUND

General anesthesia (GA) is known to worsen neural outcomes in animals, but human research assessing early-life GA exposure and neurodevelopment show inconsistent findings. We investigated the effects of a single GA exposure for minor surgery on the neurodevelopment of healthy children at multiple time-points, using clinical assessments along with behavioral and neurophysiological measures rarely used in human research.

METHODS

GA-exposed children were a prospective cohort of 250 full-term, healthy infants who underwent GA for minor surgery before 15 months. Nonexposed children were from a separate cohort of similar age, sex, ethnicity, and maternal education. In both cohorts, clinical measures (Bayley Scales of Infant and Toddler Development-III [BSID-III] and Child Behavior Checklist [CBCL1½-5]) were assessed at 24 months, and experimental tests (memory and attentional) and neurophysiology (event-related potentials) at 6 and 18 months.

RESULTS

At 24 months, there were no differences between GA-exposed and nonexposed children in the cognitive, language, motor, and socioemotional domains of the BSDI-III; however, GA-exposed children had poorer parental-reported scores in BSID-III general adaptability (94.2 vs. 99.0 [mean difference, 4.77; 97.3% confidence interval, -9.29, -0.24]; P =0.020) and poorer internalizing behavior scores on CBCL1½-5 (52.8 vs. 49.4 [mean difference, 3.35; 97.3% confidence interval, 0.15-6.55]; P =0.021). For experimental measures, GA-exposed children showed differences in 4 tests at 6 and 18 months.

CONCLUSIONS

GA-exposed children did not differ from unexposed children in cognitive, language or motor outcomes at 24 months, but exhibited poorer parent-reported behavior scores. Differences in infant behavior and neurophysiology were detected at 6 and 18 months. Neurophysiological assessments may complement clinically relevant assessments to provide greater insights into neurodevelopment following early GA exposure.

The effects of general anesthetics on mitochondrial structure and function in the developing brain

The use of general anesthetics in modern clinical practice is commonly regarded as safe for healthy individuals, but exposures at the extreme ends of the age spectrum have been linked to chronic cognitive impairments and persistent functional and structural alterations to the nervous system. The accumulation of evidence at both the epidemiological and experimental level prompted the addition of a warning label to inhaled anesthetics by the Food and Drug Administration cautioning their use in children under 3  years of age. Though the mechanism by which anesthetics may induce these detrimental changes remains to be fully elucidated, increasing evidence implicates mitochondria as a potential primary target of anesthetic damage, meditating many of the associated neurotoxic effects. Along with their commonly cited role in energy production via oxidative phosphorylation, mitochondria also play a central role in other critical cellular processes including calcium buffering, cell death pathways, and metabolite synthesis. In addition to meeting their immense energy demands, neurons are particularly dependent on the proper function and spatial organization of mitochondria to mediate specialized functions including neurotransmitter trafficking and release. Mitochondrial dependence is further highlighted in the developing brain, requiring spatiotemporally complex and metabolically expensive processes such as neurogenesis, synaptogenesis, and synaptic pruning, making the consequence of functional alterations potentially impactful. To this end, we explore and summarize the current mechanistic understanding of the effects of anesthetic exposure on mitochondria in the developing nervous system. We will specifically focus on the impact of anesthetic agents on mitochondrial dynamics, apoptosis, bioenergetics, stress pathways, and redox homeostasis. In addition, we will highlight critical knowledge gaps, pertinent challenges, and potential therapeutic targets warranting future exploration to guide mechanistic and outcomes research.

Anesthesia, the developing brain, and dexmedetomidine for neuroprotection

Anesthesia-induced neurotoxicity is a set of unfavorable adverse effects on central or peripheral nervous systems associated with administration of anesthesia. Several animal model studies from the early 2000's, from rodents to non-human primates, have shown that general anesthetics cause neuroapoptosis and impairment in neurodevelopment. It has been difficult to translate this evidence to clinical practice. However, some studies suggest lasting behavioral effects in humans due to early anesthesia exposure. Dexmedetomidine is a sedative and analgesic with agonist activities on the alpha-2 (ɑ₂) adrenoceptors as well as imidazoline type 2 (I2) receptors, allowing it to affect intracellular signaling and modulate cellular processes. In addition to being easily delivered, distributed, and eliminated from the body, dexmedetomidine stands out for its ability to offer neuroprotection against apoptosis, ischemia, and inflammation while preserving neuroplasticity, as demonstrated through many animal studies. This property puts dexmedetomidine in the unique position as an anesthetic that may circumvent the neurotoxicity potentially associated with anesthesia.

Early-life propofol exposure does not affect later-life GABAergic inhibition, seizure induction, or social behavior

The early developing brain is especially vulnerable to anesthesia, which can result in long lasting functional changes. We examined the effects of early-life propofol on adult excitatory-inhibitory balance and behavior. Postnatal day 7 male mice were exposed to propofol (250 mg/kg i.p.) and anesthesia was maintained for 2 h; control mice were given the same volume of isotonic saline and treated identically. The behavior and electrophysiology experiments were conducted when the mice were adults. We found that a 2-h neonatal propofol exposure did not significantly reduce paired pulse inhibition, alter the effect of muscimol (3 µM) to inhibit field excitatory postsynaptic potentials or alter the effect of bicuculline (100 µM) to increase the population spike in the CA1 region of hippocampal slices from adult mice. Neonatal propofol did not alter the evoked seizure response to pentylenetetrazol in adult mice. Neonatal propofol did not affect anxiety, as measured in the open field apparatus, depression-like behavior, as measured by the forced swim test, or social interactions with novel mice, in either the three-chamber or reciprocal social tests. These results were different from those with neonatal sevoflurane which demonstrated reduced adult GABAergic inhibition, increased seizure susceptibility and reduced social interaction. Even though sevoflurane and propofol both prominently enhance GABA inhibition, they have unique properties that alter the long-term effects of early-life exposure. These results indicate that clinical studies grouping several general anesthetic agents in a single group should be interpreted with great caution when examining long-term effects.

Multiple General Anesthesia in Children: A Systematic Review of Its Effect on Neurodevelopment

The effect of multiple general anesthesia (mGA) procedures administered in early life is a critical theme and has led the Food and Drug Administration (FDA) to issue an alert. This systematic review seeks to explore the potential effects on neurodevelopment of mGA on patients under 4 years. The Medline, Embase and Web of Science databases were searched for publications up to 31 March 2021. The databases were searched for publications regarding "children multiple general anesthesia OR pediatric multiple general anesthesia". Case reports, animal studies and expert opinions were excluded. Systematic reviews were not included, but they were screened to identify any possible additional information. A total of 3156 studies were identified. After removing the duplicates, screening the remaining records and analyzing the systematic reviews' bibliography, 10 studies were considered suitable for inclusion. Comprehensively, a total cohort of 264.759 unexposed children and 11.027 exposed children were assessed for neurodevelopmental outcomes. Only one paper did not find any statistically significant difference between exposed and unexposed children in terms of neurodevelopmental alterations. Controlled studies on mGA administered before 4 years of age support that there might be a greater risk of neurodevelopmental delay in children receiving mGA, warranting the need for careful risk/benefit considerations.

Long-term sevoflurane exposure resulted in temporary rather than lasting cognitive impairment in Drosophila

Sevoflurane is the primary inhaled anesthetic used in pediatric surgery. It has been the focus of research since animal models studies found that it was neurotoxic to the developing brain two decades ago. However, whether pediatric general anesthesia can lead to permanent cognitive deficits remained a subject of heated debate. Therefore, our study aims to determine the lifetime neurotoxicity of early long-time sevoflurane exposure using a short-life-cycle animal model, Drosophila melanogaster. To investigate this question, we measured the lifetime changes of two-day-old flies' learning and memory abilities after anesthesia with 3 % sevoflurane for 6 h by the T-maze memory assay. We evaluated the apoptosis, levels of ATP and ROS, and related genes in the fly head. Our results suggest that 6 h 3 % sevoflurane exposure at a young age can only induce transient neuroapoptosis and cognitive deficits around the first week after anesthesia. But this brain damage recedes with time and vanishes in late life. We also found that the mRNA level of caspases and Bcl-2, ROS level, and ATP level increased during this temporary neuroapoptosis process. And mRNA levels of antioxidants, such as SOD2 and CAT, increased and decreased simultaneously with the rise and fall of the ROS level, indicating a possible contribution to the recovery from the sevoflurane impairment. In conclusion, our results suggest that one early prolonged sevoflurane-based general anesthesia can induce neuroapoptosis and learning and memory deficit transiently but not permanently in Drosophila.

Anesthesia outcomes in lysosomal disorders: CLN3 and GM1 gangliosidosis

Natural history studies of pediatric rare neurometabolic diseases are important to understand disease pathophysiology and to inform clinical trial outcome measures. Some data collections require sedation given participants' age and neurocognitive impairment. To evaluate the safety of sedation for research procedures, we reviewed medical records between April 2017 and October 2019 from a natural history study for CLN3 (NCT03307304) and one for GM1 gangliosidosis (NCT00029965). Twenty-two CLN3 individuals underwent 28 anesthetic events (age median 11.0, IQR 8.4-15.3 years). Fifteen GM1 individuals had 19 anesthetic events (9.8, 7.1-14.7). All participants had the American Society of Anesthesiology classification of II (8/47) or III (39/47). Mean sedation durations were 186 (SD = 54; CLN3) and 291 (SD = 33; GM1) min. Individuals with GM1 (6/19, 31%) were more frequently prospectively intubated for sedation (CLN3 3/28, 11%). Minor adverse events associated with sedation occurred in 8/28 (28%, CLN3) and 6/19 (32%, GM1) individuals, frequencies within previously reported ranges. No major adverse clinical outcomes occurred in 47 anesthetic events in pediatric participants with either CLN3 or GM1 gangliosidosis undergoing research procedures. Sedation of pediatric individuals with rare neurometabolic diseases for research procedures is safe and allows for the collection of data integral to furthering their understanding and treatment.

Association Between Receipt of General Anesthesia During Childhood and Attention Deficit Hyperactive Disorder and Neurodevelopment

BACKGROUND

There are inconsistent reports regarding the association between general anesthesia and adverse neurodevelopmental and behavioral disorders in children.

METHODS

This nationwide administrative cohort study included children born in Korea between 2008 and 2009, and followed until December 31, 2017. The cohort included 93,717 participants who received general anesthesia with endotracheal intubation (ETI) who were matched to unexposed subjects in a 1:1 ratio. General anesthesia was defined by National Health Insurance Service treatment codes with intratracheal anesthesia, and the index date was the first event of general anesthesia. The primary outcome was attention deficit hyperactive disorder (ADHD), which was defined as at least a principal diagnosis of 10th revision of the International Classification of Diseases code F90.X after the age of 72 months. Neurodevelopment, which was assessed using a developmental screening test (Korean-Ages and Stages Questionnaire [K-ASQ]), was a secondary outcome. The K-ASQ is performed annually from 1 to 6 years of age and consists of 5 domains. The association between general anesthesia and ADHD was estimated using a Cox hazard model, and its association with neurodevelopment was estimated using a generalized estimation equation, with control for multiple risk factors beyond 1 year after the index date.

RESULTS

The median age at the index date was 3.8 (95% confidence interval [CI], 1.7-5.8) years, and there were 57,625 (61.5%) men. During a mean follow-up period of 5 years, the incidence rate of ADHD was 42.6 and 27.7 per 10,000 person-years (PY) in the exposed and unexposed groups, respectively (absolute rate difference 14.9 [95% CI, 12.5-17.3] per 10,000 PY). Compared to the unexposed group, the exposed group had an increased risk of ADHD (adjusted hazard ratio, 1.41 [95% CI, 1.30-1.52]). In addition, a longer duration of anesthesia with ETI and more general anesthesia procedures with ETI were associated with greater risk of ADHD. General anesthesia with ETI was also associated with poorer results in the K-ASQ.

CONCLUSION

Administration of general anesthesia with ETI to children is associated with an increased risk of ADHD and poor results in a neurodevelopmental screening test.

Risk of Neurotoxicity with Multiple General Anaesthetics for Examination Under Anaesthesia in Paediatric Ophthalmology - A Cause for Concern?

Purpose

To evaluate the impact of clinical protocol change via active minimisation on the number of general anaesthetic (GA)/sedation episodes for diagnostic ophthalmic purposes at Children's Health Ireland at Temple Street (CHI-TS), Dublin, Ireland, from 2016 to 2019, inclusive. Change was implemented following published cautionary principles in 2016 by the FDA regarding the potential neurotoxic risk from multiple GA exposure in children.

Methods

Retrospective analysis of electronic operating theatre records was completed using procedure codes "Ophthalmological examination" and "Examination of fundi". Available records for patients undergoing multiple examination under anaesthesia (EUA) procedures were assessed for demographics, indication. Comparison was made regarding overall EUA numbers and breakdown for each year, before and after the new departmental approach. From 2018 onward, a patient-centred, departmental strategy of active minimisation of EUA was adopted, using strategies of "training, technology and patience". A literature review was conducted using online databases.

Results

A total of 450 EUAs were performed over the 4 years investigated. In the former 2 years of the study period, prior to departmental policy change, EUAs represented 32% (304 of 948 total theatre episodes) of the ophthalmic theatre caseload. In the latter 2 years of this study period, this proportion fell to 19% (146 EUAs of 783 theatre episodes). Total theatre case numbers were comparable in both time periods. Eighteen children had multiple EUAs (ie, ≥2 EUAs, mean 6.5, SD 2.9) for life/sight threatening indications, totalling 116 EUAs (25.7%).

Conclusion

A significant reduction in diagnostic EUA volume was accomplished resulting in reduced individual patient risk and increased capacity for surgical interventions. A detailed description of this methodology is included for the purposes of replication at comparable units. EUA will continue to play a crucial role in the management of life/sight threatening conditions but the application of a cautionary principle to reduce EUA, where possible, is appropriate to reduce potential for neurotoxicity.

Usefulness of serum neurofilament light in the assessment of neurologic outcome in the pediatric population: a systematic literature review

Children undergoing general anesthesia and surgery in the early years of life are exposed to the possible neurotoxicity of anesthetic agents. Prospective studies have shown deficits in behavior, executive function, social communication, and motor function in children undergoing anesthesia and surgery. Different biomarkers of neuronal injury have been evaluated neuronal injury in the pediatric population, among which neurofilaments represent a significant advantage as they are proteins exclusively expressed in neuronal tissue. Our aim was to evaluate the utility of serum neurofilament light (NfL) as a prognostic biomarker of neuronal injury in the pediatric population. A literature search was performed on PubMed, Embase, and Cochrane Databases in November 2022 for studies concerning serum NfL in the pediatric population in addition to a neurological assessment. Inclusion criteria were as follows: (1) prospective or retrospective studies, (2) studies including pediatric population until the age of 18 years, (3) serum NfL sampling, and (4) evaluation of neurological outcome. Data collection regarding study design, pediatric age, serum NfL levels, and results for neurological assessment were extracted from each study. Four manuscripts met the inclusion criteria and evaluated the prognostic utility of serum NfL in neonatal encephalopathy in correlation with the neurodevelopmental outcome that was assessed by the Bayley Scales of Infant Development until the age of 2 years. Children with neonatal encephalopathy showed significantly higher serum NfL vs. healthy controls and high serum NfL levels predicted an adverse neurological outcome. The decrease of serum NfL to a nadir point between 10 and 15 years old reflects the brain growth in healthy controls. No studies were available in the perioperative period.  Conclusions: Serum NfL is a valuable biomarker in evaluating neuronal injury in the pediatric population. Further studies with perioperative serial sampling of serum NfL combined with standardized neurodevelopmental tests should be conducted to evaluate the neurotoxicity of anesthetic agents and monitor the effectiveness of specific neuroprotective strategies in pediatric patients undergoing anesthesia and surgery. What is Known: • Preclinical animal data have shown neurotoxicity of the anesthetic agents in the developing brain. • Data regarding anesthetic neurotoxicity in humans show limitations and no objective tools are available. What is New: • This systematic review showed that serum NfL is a valuable biomarker of neuronal injury in the pediatric population. • Perioperative use of serum NfL may be considered in future trials evaluating anesthetic neurotoxicity in the pediatric population and in monitoring neuroprotective strategies.

Tau protein plays a role in the mechanism of cognitive disorders induced by anesthetic drugs

Cognitive disorders are mental health disorders that can affect cognitive ability. Surgery and anesthesia have been proposed to increase the incidence of cognitive dysfunction, including declines in memory, learning, attention and executive function. Tau protein is a microtubule-associated protein located in the axons of neurons and is important for microtubule assembly and stability; its biological function is mainly regulated by phosphorylation. Phosphorylated tau protein has been associated with cognitive dysfunction mediated by disrupting the stability of the microtubule structure. There is an increasing consensus that anesthetic drugs can cause cognitive impairment. Herein, we reviewed the latest literature and compared the relationship between tau protein and cognitive impairment caused by different anesthetics. Our results substantiated that tau protein phosphorylation is essential in cognitive dysfunction caused by anesthetic drugs, and the possible mechanism can be summarized as "anesthetic drugs-kinase/phosphatase-p-Tau-cognitive impairment".

Anesthesia and developing brain: What have we learned from recent studies

Anesthesia is unavoidable in surgical procedures. However, whether the general anesthetics are neurotoxic to immature brains remains undefined. Neurodevelopmental impairment induced by anesthesia has been a critical health issue and topic of concern. This review summarizes recent progress made in clinical and preclinical studies to provide useful suggestions and potential therapeutic targets for the protection of the immature brain. On the one hand, clinical researchers continue the debate about the effect of single and multiple exposures to anesthesia on developing brains. On the other hand, preclinical researchers focus on exploring the mechanisms of neurotoxic effects of general anesthesia on immature brains and seeking novel solutions. Rodent models have always been used in preclinical studies, but it is still unclear whether the mechanisms observed in rodent models have clinical relevance. Compared with these models, non-human primates (NHPs) are more genetically similar to humans. However, few research institutions in this area can afford to use NHP models in their studies. One way to address both problems is by combining single-cell sequencing technologies to screen differential gene expression in NHPs and perform in vivo validation in rodents. The mechanism of anesthesia-induced neurotoxicity still requires further elucidation in primates.

Albumin alleviated esketamine-induced neuronal apoptosis of rat retina through downregulation of Zn2+-dependent matrix metalloproteinase 9 during the early development

Aims

Esketamine upregulates Zn²⁺-dependent matrix metalloproteinase 9 (MMP9) and increases the neuronal apoptosis in retinal ganglion cell layer during the early development. We aimed to test whether albumin can alleviate esketamine-induced apoptosis through downregulating Zn²⁺-dependent MMP9.

Methods

We investigate the role of Zn²⁺ in esketamine-induced neuronal apoptosis by immunofluorescence. MMP9 protein expression and enzyme activity were investigated by zymography in situ., western blot and immunofluorescence. Whole-mount retinas from P7 Sprague-Dawley rats were used.

Results

We demonstrated that esketamine exposure increased Zn²⁺ in the retinal GCL during the early development. Zn²⁺-dependent MMP9 expression and enzyme activity up-regulated, which eventually aggravated apoptosis. Albumin effectively down-regulated MMP9 expression and activity via binding of free zinc, ultimately protected neurons from apoptosis. Meanwhile albumin treatment promoted activated microglia into multi-nucleated macrophagocytes and decreased the inflammation.

Conclusion

Albumin alleviates esketamine-induced neuronal apoptosis through decreasing Zn²⁺ accumulation in GCL and downregulating Zn²⁺-dependent MMP9.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12868-022-00753-5.

Bumetanide attenuates sevoflurane-induced neuroapoptosis in the developing dentate gyrus and impaired behavior in the contextual fear discrimination learning test

INTRODUCTION

Sevoflurane acts as a gamma-aminobutyric acid subtype A receptor agonist and can induce widespread apoptosis of immature dentate granule cells in postnatal day 21 mice. The dentate granule cells of postnatal day 21 mice undergo a developmental stage when gamma-aminobutyric acid (GABA) shifts from inducing the depolarization of neurons to causing hyperpolarization. However, it is unclear whether sevoflurane induces apoptosis of immature granule cells by facilitating the depolarization or hyperpolarization of neurons.

METHODS

We utilized bumetanide, an Na⁺ -K⁺ -2Cl^- cotransporter isoform 1 (NKCC1) antagonist, to determine whether the NKCC1-mediated GABA depolarization of neurons plays a role in sevoflurane-induced neuroapoptosis. We also investigated whether sevoflurane exposure is related to long-term cognitive dysfunction in postnatal day 21 mice and explored the possible protective effects of bumetanide.

RESULTS

Bumetanide attenuated the sevoflurane-induced apoptosis of dentate granule cells in postnatal day 21 mice. Exposure to sevoflurane at postnatal day 21 mice did not affect their motor ability or anxiety level, and it had no effect on spatial learning or memory functions. However, sevoflurane exposure at postnatal day 21 impaired the pattern separation ability in the contextual fear discrimination test; bumetanide mitigated this effect of sevoflurane as well.

CONCLUSION

Bumetanide attenuates sevoflurane-induced apoptosis and is a promising prospect for protecting against anesthesia-induced neurotoxicity in the developing brain.

Biophilic virtual reality on children's anxiety and pain during circumcision: A randomized controlled study

INTRODUCTION

The aim of this study was to evaluate the effects of the biophilic virtual reality (BVR) method on children's pain and anxiety undergoing circumcision.

MATERIALS AND METHODS

This randomized controlled study used a parallel trial design guided by the CONSORT checklist. A total of 106 children were included in the analysis. Intraoperative anxiety was assessed by using the simplified Chinese version of the modified Yale Preoperative Anxiety Scale (CmYPAS), Visual Analogue Scale (VAS), heart rate (HR), and Anxiety index (Ai). Intraoperative pain was assessed by using the Faces Pain Scale-Revised (FPS-R), and Pain index (Pi). The Pearson correlation analysis was used to analyze the relationship between Ai and the CmYPAS. The primary outcomes were CmYPAS, VAS, and FPS-R, which were analyzed using the Kruskal-Wallis test.

RESULTS

Baseline variables were not significantly different between the BVR group (34 patients), the indoor virtual reality (IVR) group (36 patients), and the blank control group (36 patients). The CmYPAS scores during surgery were significantly lower in the BVR group and the IVR group versus the blank control group (25.0[22.9-29.2], 22.9[22.9-29.2], 33.3[33.3-38.5] respectively; P < 0.001). The VAS scores during surgery were significantly lower in the BVR group and the IVR group versus the blank control group (5.0[3.0-7.0], 3.0[2.0-5.0], 6.0[5.0-8.8] respectively; P < 0.001). The FPS-R scores during surgery were significantly lower in the BVR group and IVR group versus the blank control group (2.0[1.8-4.2], 3.0[2.0-4.8], 5.5[5.0-8.0], respectively; P < 0.001). At removal of the foreskin, Pi were significantly lower in the BVR group and IVR group versus the blank control group (6.9[4.1], 7.7[3.3], 9.8[6.2] respectively; P = 0.033). The Ai scores at each time point were significantly lower in the BVR group and IVR group versus the control (P = 0.015, P = 0.006 respectively). The correlation analysis of Ai (at removal of the foreskin) and CmYPAS scores in children showed that the Pearson correlation coefficient was 0.194 (P = 0.046).

DISCUSSION

This is the first RCT to investigate the effects of BVR in children undergoing circumcision. This study demonstrates a reduction in pediatric intraoperative pain and anxiety with the use of virtual reality (VR).

CONCLUSION

Intraoperative VR may be an effective noninvasive modality for reducing pain and anxiety during circumcision. Pi and Ai might be used to assess subjective pain and anxiety in patients.

General anesthesia in children and long-term neurodevelopmental deficits: A systematic review

Background

Millions of children experienced surgery procedures requiring general anesthesia (GA). Any potential neurodevelopmental risks of pediatric anesthesia can be a serious public health issue. Various animal studies have provided evidence that commonly used GA induced a variety of morphofunctional alterations in the developing brain of juvenile animals.

Methods

We conducted a systematic review to provide a brief overview of preclinical studies and summarize the existing clinical studies. Comprehensive literature searches of PubMed, EMBASE, CINAHL, OVID Medline, Web of Science, and the Cochrane Library were conducted using the relevant search terms “general anesthesia,” “neurocognitive outcome,” and “children.” We included studies investigating children who were exposed to single or multiple GA before 18, with long-term neurodevelopment outcomes evaluated after the exposure(s).

Results

Seventy-two clinical studies originating from 18 different countries published from 2000 to 2022 are included in this review, most of which are retrospective studies (n = 58). Two-thirds of studies (n = 48) provide evidence of negative neurocognitive effects after GA exposure in children. Neurodevelopmental outcomes are categorized into six domains: academics/achievement, cognition, development/behavior, diagnosis, brain studies, and others. Most studies focusing on children &lt;7 years detected adverse neurocognitive effects following GA exposure, but not all studies consistently supported the prevailing view that younger children were at greater risk than senior ones. More times and longer duration of exposures to GA, and major surgeries may indicate a higher risk of negative outcomes.

Conclusion

Based on current studies, it is necessary to endeavor to limit the duration and numbers of anesthesia and the dose of anesthetic agents. For future studies, we require cohort studies with rich sources of data and appropriate outcome measures, and carefully designed and adequately powered clinical trials testing plausible interventions in relevant patient populations.

Effect of scalp nerve block with ropivacaine on postoperative pain in pediatric patients undergoing craniotomy: A randomized controlled trial

Background

Scalp nerve block (SNB) is widely used for postoperative pain control, intraoperative hemodynamic control, and opioid-sparing in adult craniotomies. However, there are few studies of SNB in pediatric patients undergoing craniotomy. In the present study, we aimed to investigate the effect of SNB on postoperative pain, intraoperative hemodynamic stability, and narcotic consumption in pediatric craniotomy under general anesthesia.

Methods

This trial is a single-center, prospective, randomized, and double-blind study. A total of 50 children aged between 2 and 12 years who are undergoing elective brain tumor surgery will be randomly allocated in a 1:1 ratio to receive either 0.2% ropivacaine for SNB (group SNB, intervention group, n = 25) or the same volume of saline (group Ctrl, control group, n = 25). The primary outcome was to assess the score of postoperative pain intensity at time 1, 4, 8, 12, 24, and 48 h postoperatively using the FLACC score method. Secondary outcomes were to record intraoperative hemodynamic variables (MAP and HR) during skull-pin fixation, skin incision and end of skin closure, intraoperative total consumption of remifentanil and propofol, postoperative opioid consumption, and the incidence of postoperative nausea and vomiting.

Results

Fifty patients were analyzed (n = 25 in SNB group; n = 25 in control group). Compared to the control group, postoperative pain intensity was significantly relieved in the SNB group up to 8 h post-operatively. In addition, SNB provided good intraoperative hemodynamic stability, reduced intraoperative overall propofol and remifentanil consumption rate, and postoperative fentanyl consumption compared to the control group. However, the incidence of postoperative nausea and vomiting was not different between SNB and the control group.

Conclusions

In pediatric craniotomies, SNB with 0.2% ropivacaine provides adequate postoperative pain control and good intraoperative hemodynamic stability during noxious events compared to the control group.

Clinical trial registration

Chinese Clinical Trial Registry [No: ChiCTR2100050594], Prospective registration.

The impact of early exposure to general anesthesia on visual and neurocognitive development

Every year millions of children are exposed to general anesthesia while undergoing surgical and diagnostic procedures. In the field of ophthalmology, 44,000 children are exposed to general anesthesia annually for strabismus surgery alone. While it is clear that general anesthesia is necessary for sedation and pain minimization during surgical procedures, the possibility of neurotoxic impairments from its exposure is of concern. In animals there is strong evidence linking early anesthesia exposure to abnormal neural development. but in humans the effects of anesthesia are debated. In humans many aspects of vision develop within the first year of life, making the visual system vulnerable to early adverse experiences and potentially vulnerable to early exposure to general anesthesia. We attempt to address whether the visual system is affected by early postnatal exposure to general anesthesia. We first summarize key mechanisms that could account for the neurotoxic effects of general anesthesia on the developing brain and review existing literature on the effects of early anesthesia exposure on the visual system in both animals and humans and on neurocognitive development in humans. Finally, we conclude by proposing future directions for research that could address unanswered questions regarding the impact of general anesthesia on visual development.

Long-term cognitive and behavioral outcomes following early exposure to general anesthetics

PURPOSE OF REVIEW

Nearly 100 clinical studies have been published evaluating neurodevelopmental outcomes in children following surgery and anesthesia. These studies have reported mixed results, likely attributable at least in part to significant heterogeneity in their study designs, types and numbers of exposures, patient populations evaluated, and most importantly, the outcomes that were assessed. This review aims to summarize the results from clinical studies evaluating behavioral outcomes in children exposed to surgery and anesthesia.

RECENT FINDINGS

Children with early exposure to surgery and anesthesia were found to have limited to no differences in intelligence when compared with unexposed children. However, several studies have reported more behavioral problems in children exposed to general anesthesia. An increased incidence of attention-deficit hyperactivity disorder has also been reported in anesthetic exposed children, particularly after multiple exposures.

SUMMARY

Nearly all clinical studies of anesthetic neurotoxicity are observational in nature, so the associations between anesthetic exposure and behavioral deficits cannot yet be directly attributed to the anesthetic medication. However, the finding of deficits in some neurodevelopmental domains and not others will help guide the selection of appropriate outcomes in future studies of anesthetic neurotoxicity that can further evaluate whether anesthetic medications have an impact on neurodevelopment in children.

Repeated ketamine anesthesia during neurodevelopment upregulates hippocampal activity and enhances drug reward in male mice

Early exposures to anesthetics can cause long-lasting changes in excitatory/inhibitory synaptic transmission (E/I imbalance), an important mechanism for neurodevelopmental disorders. Since E/I imbalance is also involved with addiction, we further investigated possible changes in addiction-related behaviors after multiple ketamine anesthesia in late postnatal mice. Postnatal day (PND) 16 mice received multiple ketamine anesthesia (35 mg kg^-1, 5 days), and behavioral changes were evaluated at PND28 and PND56. Although mice exposed to early anesthesia displayed normal behavioral sensitization, we found significant increases in conditioned place preference to both low-dose ketamine (20 mg kg^-1) and nicotine (0.5 mg kg^-1). By performing transcriptome analysis and whole-cell recordings in the hippocampus, a brain region involved with CPP, we also discovered enhanced neuronal excitability and E/I imbalance in CA1 pyramidal neurons. Interestingly, these changes were not found in female mice. Our results suggest that repeated ketamine anesthesia during neurodevelopment may influence drug reward behavior later in life.

Identification of Prefrontal Cortex and Amygdala Expressed Genes Associated With Sevoflurane Anesthesia on Non-human Primate

Clinical trials and animal studies have indicated that long-term use or multiple administrations of anesthesia may lead to fine motor impairment in the developing brain. Most studies on anesthesia-induced neurotoxicity have focused on the hippocampus and prefrontal cortex (PFC); however, the role of other vital encephalic regions, such as the amygdala, is still unclear. Herein, we focused on sevoflurane, the most commonly used volatile anesthetic in infants, and performed a transcriptional analysis of the PFC and amygdala of macaques after multiple exposures to the anesthetic by RNA sequencing. The overall, overlapping, and encephalic region-specific transcriptional patterns were separately analyzed to reveal their functions and differentially expressed gene sets that were influenced by sevoflurane. Specifically, functional, protein–protein interaction, neighbor gene network, and gene set enrichment analyses were performed. Further, we built the basic molecular feature of the amygdala by comparing it to the PFC. In comparison with the amygdala’s changing pattern following sevoflurane exposure, functional annotations of the PFC were more enriched in glial cell-related biological functions than in neuron and synapsis development. Taken together, transcriptional studies and bioinformatics analyses allow for an improved understanding of the primate PFC and amygdala.

Safety of general anaesthetics on the developing brain: are we there yet?

Thirty years ago, neurotoxicity induced by general anaesthetics in the developing brain of rodents was observed. In both laboratory-based and clinical studies, many conflicting results have been published over the years, with initial data confirming both histopathological and neurodevelopmental deleterious effects after exposure to general anaesthetics. In more recent years, animal studies using non-human primates and new human cohorts have identified some specific deleterious effects on neurocognition. A clearer pattern of neurotoxicity seems connected to exposure to repeated general anaesthesia. The biochemistry involved in this neurotoxicity has been explored, showing differential effects of anaesthetic drugs between the developing and developed brains. In this narrative review, we start with a comprehensive description of the initial concerning results that led to recommend that any non-essential surgery should be postponed after the age of 3 yr and that research into this subject should be stepped up. We then focus on the neurophysiology of the developing brain under general anaesthesia, explore the biochemistry of the observed neurotoxicity, before summarising the main scientific and clinical reports investigating this issue. We finally discuss the GAS trial, the importance of its results, and some potential limitations that should not undermine their clinical relevance. We finally suggest some key points that could be shared with parents, and a potential research path to investigate the biochemical effects of general anaesthesia, opening up perspectives to understand the neurocognitive effects of repetitive exposures, especially in at-risk children.

After nectarine: how should we provide anesthesia for neonates?

PURPOSE OF REVIEW

Neonates have a high risk of perioperative morbidity and mortality. The NEonate and Children audiT of Anaesthesia pRactice IN Europe (NECTARINE) investigated the anesthesia practice, complications and perioperative morbidity and mortality in neonates and infants <60 weeks post menstrual age requiring anesthesia across 165 European hospitals. The goal of this review is to highlight recent publications in the context of the NECTARINE findings and subsequent changes in clinical practice.

RECENT FINDINGS

A perioperative triad of hypoxia, anemia, and hypotension is associated with an increased overall mortality at 30 days. Hypoxia is frequent at induction and during maintenance of anesthesia and is commonly addressed once oxygen saturation fall below 85%.Blood transfusion practices vary widely variable among anesthesiologists and blood pressure is only a poor surrogate of tissue perfusion. Newer technologies, whereas acknowledging important limitations, may represent the currently best tools available to monitor tissue perfusion. Harmonization of pediatric anesthesia education and training, development of evidence-based practice guidelines, and provision of centralized care appear to be paramount as well as pediatric center referrals and international data collection networks.

SUMMARY

The NECTARINE provided new insights into European neonatal anesthesia practice and subsequent morbidity and mortality.Maintenance of physiological homeostasis, optimization of oxygen delivery by avoiding the triad of hypotension, hypoxia, and anemia are the main factors to reduce morbidity and mortality. Underlying and preexisting conditions such as prematurity, congenital abnormalities carry high risk of morbidity and mortality and require specialist care in pediatric referral centers.

Nonapoptotic caspases in neural development and in anesthesia-induced neurotoxicity

Apoptosis, classically initiated by caspase pathway activation, plays a prominent role during normal brain development as well as in neurodegeneration. The noncanonical, nonlethal arm of the caspase pathway is evolutionarily conserved and has also been implicated in both processes, yet is relatively understudied. Dysregulated pathway activation during critical periods of neurodevelopment due to environmental neurotoxins or exposure to compounds such as anesthetics can have detrimental consequences for brain maturation and long-term effects on behavior. In this review, we discuss key molecular characteristics and roles of the noncanonical caspase pathway and how its dysregulation may adversely affect brain development. We highlight both genetic and environmental factors that regulate apoptotic and sublethal caspase responses and discuss potential interventions that target the noncanonical caspase pathway for developmental brain injuries.

Anesthetic Exposure During Childhood and Neurodevelopmental Outcomes: A Systematic Review and Meta-analysis

Importance

Clinical studies of neurodevelopmental outcomes after anesthetic exposure have evaluated a range of outcomes with mixed results.

Objective

To examine via meta-analyses the associations between exposure to general anesthesia and domain-specific neurodevelopmental outcomes in children.

Data Sources

PubMed/MEDLINE, Embase, CINAHL, Web of Science and the Cochrane Library were searched from inception to August 31, 2021.

Study Selection

Inclusion criteria were exposures to procedures requiring general anesthesia at younger than 18 years and evaluation of long-term neurodevelopmental function after exposure. Studies lacking unexposed controls or focused on children with major underlying comorbidities were excluded.

Data Extraction and Synthesis

Extracted variables included effect size; hazard, risk, or odds ratio; number of exposures; procedure type; major comorbidities; age of exposure and assessment; presence of unexposed controls; and study design. Studies were independently reviewed by 2 coders, and review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Data were pooled using a random-effects model.

Main Outcomes and Measures

The main outcomes were standardized mean differences (SMD) for scores in the neurodevelopmental domains of academics, behavioral problems, cognition, executive function, general development, language, motor function, nonverbal reasoning, social cognition, and hazard and risk of neurodevelopmental disorder diagnoses.

Results

A total of 31 studies contributed data for meta-analysis. For each of the assessed neurodevelopmental domains, the numbers of children evaluated ranged from 571 to 63 315 exposed and 802 to 311 610 unexposed. Children with any exposure (single or multiple) had significantly worse behavioral problems scores, indicating more behavioral problems (SMD, -0.10; 95% CI, -0.18 to -0.02; P = .02), and worse scores in academics (SMD, -0.07; 95% CI -0.12 to -0.01; P = .02), cognition (SMD, -0.03; 95% CI, -0.05 to 0.00; P = .03), executive function (SMD, -0.20; 95% CI, -0.32 to -0.09; P < .001), general development (SMD, -0.08; 95% CI, -0.13 to -0.02; P = .01), language (SMD, -0.08; 95% CI, -0.14 to -0.02; P = .01), motor function (SMD, -0.11; 95% CI, -0.21 to -0.02; P = .02), and nonverbal reasoning (SMD, -0.15; 95% CI, -0.27 to -0.02; P = .02). Higher incidences of neurodevelopmental disorder diagnoses were also reported (hazard ratio, 1.19; 95% CI, 1.09 to 1.30; P < .001; risk ratio, 1.81; 95% CI, 1.25 to 2.61; P = .002).

Conclusions and Relevance

These findings support the hypothesis that associations between anesthetic exposure during childhood and subsequent neurodevelopmental deficits differ based on neurodevelopmental domain.

Can Concomitant Bladder Neck Incision and Primary Valve Ablation Reduce Early Re-admission Rate and Secondary Intervention?

Objective:

To assess the effect of bladder neck morphology and its incision (BNI) in patients with posterior urethral valve (PUV) on early reintervention rate.

Patients and methods:

Infants undergoing PUV ablation (PVA) before 24 months of age and had at least 18 months of follow-up, were categorized into three groups according to the bladder neck appearance on baseline radiological and endoscopic examination: group 1; normal bladder neck underwent PVA, group 2; high bladder neck underwent PVA plus BNI, group 3; high bladder neck underwent PVA only. Early reintervention was defined as the need for check cystoscopy because of persistent renal function deterioration, worsening hydronephrosis and/or unsatisfactory VCUG improvement during the 1st six months post primary PVA.

Results:

Between 2000 and 2017, a total of 114 patients underwent PVA and met the study criteria with a median follow-up of 58 (18-230) months. For group 1, 16 (22.9%) patients needed readmission. Check cystoscopy was free and no further intervention was performed in 5(7.5%) and re-ablation was performed in 11(15.7%) patients. For group 2, 3(14.3%) patients needed reintervention. Re-ablation and re-ablation plus BNI were performed in 1(4.8%) and 2(9.5%), respectively. For group 3, cystoscopy was free in 1(4.3%), re-ablation and re-ablation plus BNI were performed 2(8.7%) and 1(4.3%), respectively. There were no significant differences in the re-admission and re-intervention rates among the three study groups (p=0.65 and p=0.50, respectively).

Conclusion:

In morphologically high bladder neck associated PUV, concomitant BNI with PVA doesn’t reduce early re-intervention rate.

Factors associated with inguinal hernia repair in premature infants during neonatal admission

INTRODUCTION

Timing of inguinal hernia repair (IHR) in premature infants is variable and influenced by surgeon preference and complication profile. The purpose of this study was to evaluate factors related to early IHR, defined as hernia repair during initial neonatal admission, in premature infants.

METHODS

Neonatal hospitalizations of premature infants (gestational age at birth < 37 weeks and ≤ 28 days old at admission), with a diagnosis of inguinal hernia from 2010 to 2017 in HCUP National Inpatient Sample and Kid's Inpatient Sample databases were evaluated. Multivariable Cox proportional hazard models was used to estimate associations between demographics, additional procedures, hospital characteristics, and early IHR.

RESULTS

Overall, 30,298 neonatal hospitalizations of premature infants with inguinal hernia were identified; 13,228 (43.3%) underwent early IHR. Early IHR was more likely with older gestational age at birth (35-36 weeks vs < 24 weeks, HR 6.05, 95% CI 4.17, 8.79), female sex (HR 1.20, 95% CI 1.07, 1.34), and undergoing concomitant gastrostomy (HR 2.51, 95% CI 1.72, 3.66). Non-Hispanic Black infants (HR 0.84, 95% CI 0.75, 0.95), infants at urban non-teaching hospitals (HR 0.15, 95% CI 0.07, 0.33), and infants at rural hospitals (HR 0.81, 95% CI 0.70, 0.97) were less likely to undergo early IHR.

CONCLUSIONS

Using a nationally representative database, early IHR in premature neonates was more commonly performed in non-Hispanic White, female neonates and at urban teaching hospitals. Patient race and hospital type were determinants of early IHR in premature neonates. There is a need to further evaluate the impact of race and socioeconomic factors on outcomes of common pediatric operations like inguinal hernia repairs.

LEVEL OF EVIDENCE

Level III.

Office Insertion of Tympanostomy Tubes and the Role of Automated Insertion Devices

OBJECTIVE

Insertion of tubes in an office setting and automated tube insertion devices were identified as high-priority quality improvement opportunities during the update process for the 2013 clinical practice guideline on tympanostomy tubes from the American Academy of Otolaryngology-Head and Neck Surgery. The guideline update group, however, decided to avoid any recommendations on these topics, based on limited research evidence, and instead selected a subset of group members to author this state of the art review, with the goal of facilitating informed decisions in clinical practice.

DATA SOURCES

PubMed through September 2021, Google search of device manufacturer websites, and SmartTots research website for articles on anesthesia neurotoxicity.

REVIEW METHODS

A state of the art review format emphasizing evidence from the past 5 years, with manual cross-checks of reference lists of identified articles for additional relevant studies.

CONCLUSIONS

The existing literature is too sparse to make recommendations about procedure setting and optimal technique or assess long-term outcomes. The role of automated devices is uncertain, given the increased equipment cost and limited information on characteristics of the proprietary preloaded tubes, including intubation duration and rates of otorrhea, obstruction, medialization, granulation tissue, and persistent perforation.

IMPLICATIONS FOR PRACTICE

Whether to undertake in-office tube insertion in awake children should be based on clinician experience, clinician ability to interact with and reassure caregivers, shared decisions with caregivers, and judgment regarding the level of cooperation (or lack thereof) to be expected from a given child. Clinicians should remain alert to new research and expect increasing queries from patients and families.

Anesthesia and Developing Brains: Unanswered Questions and Proposed Paths Forward

Anesthetic agents disrupt neurodevelopment in animal models, but evidence in humans is mixed. The morphologic and behavioral changes observed across many species predicted that deficits should be seen in humans, but identifying a phenotype of injury in children has been challenging. It is increasingly clear that in children, a brief or single early anesthetic exposure is not associated with deficits in a range of neurodevelopmental outcomes including broad measures of intelligence. Deficits in other domains including behavior, however, are more consistently reported in humans and also reflect findings from nonhuman primates. The possibility that behavioral deficits are a phenotype, as well as the entire concept of anesthetic neurotoxicity in children, remains a source of intense debate. The purpose of this report is to describe consensus and disagreement among experts, summarize preclinical and clinical evidence, suggest pathways for future clinical research, and compare studies of anesthetic agents to other suspected neurotoxins.

Mechanistic insight into sevoflurane-associated developmental neurotoxicity

With the development of technology, more infants receive general anesthesia for surgery, other interventions, or clinical examination at an early stage after birth. However, whether general anesthetics can affect the function and structure of the developing infant brain remains an important, complex, and controversial issue. Sevoflurane is the most-used anesthetic in infants, but this drug is potentially neurotoxic. Short or single exposure to sevoflurane has a weak effect on cognitive function, while long or repeated exposure to general anesthetics may cause cognitive dysfunction. This review focuses on the mechanisms by which sevoflurane exposure during development may induce long-lasting undesirable effects on the brain. We review neural cell death, neural cell damage, impaired assembly and plasticity of neural circuits, tau phosphorylation, and neuroendocrine effects as important mechanisms for sevoflurane-induced developmental neurotoxicity. More advanced technologies and methods should be applied to determine the underlying mechanism(s) and guide prevention and treatment of sevoflurane-induced neurotoxicity.

1. We discuss the mechanisms underlying sevoflurane-induced developmental neurotoxicity from five perspectives: neural cell death, neural cell damage, assembly and plasticity of neural circuits, tau phosphorylation, and neuroendocrine effects. 2. Tau phosphorylation, IL-6, and mitochondrial dysfunction could interact with each other to cause a nerve damage loop. 3. miRNAs and lncRNAs are associated with sevoflurane-induced neurotoxicity.