Performance of Febrile Infant Algorithms by Duration of Fever.

OBJECTIVES: To analyze the performance of commonly used blood tests in febrile infants ≤90 days of age to identify patients at low risk for invasive bacterial infection (bacterial pathogen in blood or cerebrospinal fluid) by duration of fever. METHODS: We conducted a secondary analysis of a prospective single-center registry that includes all consecutive infants ≤90 days of age with fever without a source evaluated at 1 pediatric emergency department between 2008 and 2021. We defined 3 groups based on caregiver-reported hours of fever (<2, 2-12, and ≥12) and analyzed the performance of the biomarkers and Pediatric Emergency Care Applied Research Network, American Academy of Pediatrics, and Step-by-Step clinical decision rules. RESULTS: We included 2411 infants; 76 (3.0%) were diagnosed with an invasive bacterial infection. The median duration of fever was 4 (interquartile range, 2-12) hours, with 633 (26.3%) patients with fever of <2 hours. The area under the curve was significantly lower in patients with <2 hours for absolute neutrophil count (0.562 vs 0.609 and 0.728) and C-reactive protein (0.568 vs 0.760 and 0.812), but not for procalcitonin (0.749 vs 0.780 and 0.773). Among well-appearing infants older than 21 days and negative urine dipstick with <2 hours of fever, procalcitonin ≥0.14 ng/mL showed a better sensitivity (100% with specificity 53.8%) than that of the combination of biomarkers of Step-by-Step (50.0% and 82.2%), and of the American Academy of Pediatrics and Pediatric Emergency Care Applied Research Network rules (83.3% and 58.3%), respectively. CONCLUSIONS: The performance of blood biomarkers, except for procalcitonin, in febrile young infants is lower in fever of very short duration, decreasing the accuracy of the clinical decision rules.

Patógenos bacterianos y resistencia a los antibióticos en otitis media aguda / Bacterial pathogens and antimicrobial resistance in acute otitis media

Introducción: Estudios recientes señalan un aumento de la prevalencia de Haemophilus influenzae y una disminución de Streptococcus pneumoniae entre las bacterias causantes de otitis media aguda (OMA). El objetivo del estudio es conocer la distribución de microorganismos patógenos identificados en Urgencias en los menores de 14 años con OMA y su patrón de resistencias. Pacientes y métodos: Estudio retrospectivo, analítico y unicéntrico incluyendo pacientes menores de 14 años diagnosticados de OMA en los que se recogió un cultivo de secreción ótica en el servicio de urgencias pediátricas de un hospital terciario entre 2013 y 2021. Resultados: Durante el periodo de estudio se registraron 14.684 episodios con diagnóstico de OMA, recogiéndose en 768 cultivo de secreción ótica. La mediana de edad fue de 2 años, el 57% varones y el 70% habían presentado al menos una OMA previa. Los patógenos más frecuentemente aislados fueron: Haemophilus influenzae, 188 (24,5%; de ellos, 15,5% resistentes a ampicilina); Streptococcus pyogenes, 86 (11,2%); Staphylococcus aureus, 82 (10,7%); Streptococcus pneumoniae, 54 (6,9%; de ellos, 9,4% con resistencia intermedia a penicilina); Pseudomonas aeruginosa, 42 (5,5%) y Moraxella catarrhalis, 11 (1,4%). En el 34,9% no se aislaron patógenos. Conclusiones: Haemophilus influenzae es la primera causa de OMA en menores de 14 años. Este hecho, junto a la baja tasa de aislamientos y resistencia a penicilina de Streptococcus pneumoniae, cuestiona la idoneidad de la amoxicilina a dosis elevadas como tratamiento antibiótico empírico de la OMA.(AU)

Introduction: Recent studies show an increase in the prevalence of Haemophilus influenzae and a decrease in Streptococcus pneumoniae among the bacteria that cause acute otitis media (AOM). The objective of our study was to analyse the distribution of pathogens identified in children aged less than 14 years presenting to the emergency department with AOM and their patterns of antimicrobial resistance. Patients and methods: Single centre retrospective, analytical study in patients aged less than 14 years with a diagnosis of AOM in whom an ear drainage sample was collected for culture in the paediatric emergency department of a tertiary care hospital between 2013 and 2021. Results: During the study period, there were 14,684 documented care episodes corresponding to children with a diagnosis of AOM. An ear drainage culture was performed in 768 of those episodes. The median age of the patients was 2 years, 57% were male and 70% had a previous history of AOM. The most frequently isolated pathogens were: Haemophilus influenzae (n=188 [24.5%]; 15.5% of them resistant to ampicillin), Streptococcus pyogenes (n=86 [11.2%]), Staphylococcus aureus (n=82 [10.7%]), Streptococcus pneumoniae (n=54 [6.9%]; 9.4% with intermediate resistance to penicillin), Pseudomonas aeruginosa (n=42 [5.5%]) and Moraxella catarrhalis (n=11 [1.4%]). No pathogen was isolated in 34.9% of cases. Conclusions: Haemophilus influenzae is the leading cause of AOM in children aged less than 14 years. This, combined with the low frequency of isolation and penicillin resistance of Streptococcus pneumoniae, calls into question the appropriateness of high-dose amoxicillin for empiric treatment of AOM.(AU)

Bacterial pathogens and antimicrobial resistance in acute otitis media.

INTRODUCTION: Recent studies show an increase in the prevalence of Haemophilus influenzae and a decrease in Streptococcus pneumoniae among the bacteria that cause acute otitis media (AOM). The objective of our study was to analyse the distribution of pathogens identified in children aged less than 14 years presenting to the emergency department with AOM and their patterns of antimicrobial resistance. PATIENTS AND METHODS: Single centre retrospective, analytical study in patients aged less than 14 years with a diagnosis of AOM in whom an ear drainage sample was collected for culture in the paediatric emergency department of a tertiary care hospital between 2013 and 2021. RESULTS: During the study period, there were 14 684 documented care episodes corresponding to children with a diagnosis of AOM. An ear drainage culture was performed in 768 of those episodes. The median age of the patients was 2 years, 57% were male and 70% had a previous history of AOM. The most frequently isolated pathogens were: Haemophilus influenzae (n = 188 [24.5%]; 15.5% of them resistant to ampicillin), Streptococcus pyogenes (n = 86 [11.2%]), Staphylococcus aureus (n = 82 [10.7%]), Streptococcus pneumoniae (n = 54 [6.9%]; 9.4% with intermediate resistance to penicillin), Pseudomonas aeruginosa (n = 42 [5.5%]) and Moraxella catarrhalis (n = 11 [1.4%]). No pathogen was isolated in 34.9% of cases. CONCLUSIONS: Haemophilus influenzae is the leading cause of AOM in children aged less than 14 years. This, combined with the low frequency of isolation and penicillin resistance of Streptococcus pneumoniae, calls into question the appropriateness of high-dose amoxicillin for empiric treatment of AOM.

Impact of SARS-CoV-2 Infection on the Association Between Laboratory Tests and Severe Outcomes Among Hospitalized Children.

Background: To assist clinicians with identifying children at risk of severe outcomes, we assessed the association between laboratory findings and severe outcomes among severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-infected children and determined if SARS-CoV-2 test result status modified the associations. Methods: We conducted a cross-sectional analysis of participants tested for SARS-CoV-2 infection in 41 pediatric emergency departments in 10 countries. Participants were hospitalized, had laboratory testing performed, and completed 14-day follow-up. The primary objective was to assess the associations between laboratory findings and severe outcomes. The secondary objective was to determine if the SARS-CoV-2 test result modified the associations. Results: We included 1817 participants; 522 (28.7%) SARS-CoV-2 test-positive and 1295 (71.3%) test-negative. Seventy-five (14.4%) test-positive and 174 (13.4%) test-negative children experienced severe outcomes. In regression analysis, we found that among SARS-CoV-2-positive children, procalcitonin ≥0.5 ng/mL (adjusted odds ratio [aOR], 9.14; 95% CI, 2.90-28.80), ferritin >500 ng/mL (aOR, 7.95; 95% CI, 1.89-33.44), D-dimer ≥1500 ng/mL (aOR, 4.57; 95% CI, 1.12-18.68), serum glucose ≥120 mg/dL (aOR, 2.01; 95% CI, 1.06-3.81), lymphocyte count <1.0 × 109/L (aOR, 3.21; 95% CI, 1.34-7.69), and platelet count <150 × 109/L (aOR, 2.82; 95% CI, 1.31-6.07) were associated with severe outcomes. Evaluation of the interaction term revealed that a positive SARS-CoV-2 result increased the associations with severe outcomes for elevated procalcitonin, C-reactive protein (CRP), D-dimer, and for reduced lymphocyte and platelet counts. Conclusions: Specific laboratory parameters are associated with severe outcomes in SARS-CoV-2-infected children, and elevated serum procalcitonin, CRP, and D-dimer and low absolute lymphocyte and platelet counts were more strongly associated with severe outcomes in children testing positive compared with those testing negative.

Characteristics of Pediatric Emergency Department Presentations of Anaphylaxis in Spain.

OBJECTIVE: This study aimed to identify the triggers of pediatric anaphylaxis in Spain and to analyze the circumstances of the episode. METHODS: Planned secondary analysis of a prospective observational multicenter study endorsed by the Spanish Society of Pediatric Emergencies including children aged younger than 18 years diagnosed with anaphylaxis in 7 Spanish pediatric emergency departments (EDs) between 2016 and 2018. We analyzed factors related to the anaphylaxis episode and its management. RESULTS: Four hundred fifty-three cases were registered, happening mainly at home (295 [65.1%]), school (65 [14.3%]), and street (61 [13.5%]). The median age was 5 years, 143 (31.6%) had previous episodes, and 165 (36.4%) had previously been prescribed an epinephrine autoinjector, used in 40 (24.2% of those prescribed). Two thirds were well-appearing when arriving to the pediatric ED. Food was the trigger in 396 (87.4%). In 349 with a single food involved, the most frequent were milk (108 [30.4%]), nuts (103 [29.0%]), hen's egg (40 [11.3%]), and fish (31 [8.7%]), with variations related to the age of the child. CONCLUSIONS: Food, especially milk and nuts, are responsible for most anaphylaxis diagnosed in Spanish pediatric EDs. Consideration should be given to improving health education due to the low use of epinephrine autoinjectors.

Sedation and Analgesia for Reduction of Pediatric Ileocolic Intussusception.

Importance: Ileocolic intussusception is an important cause of intestinal obstruction in children. Reduction of ileocolic intussusception using air or fluid enema is the standard of care. This likely distressing procedure is usually performed without sedation or analgesia, but practice variation exists. Objective: To characterize the prevalence of opioid analgesia and sedation and assess their association with intestinal perforation and failed reduction. Design, Setting, and Participants: This cross-sectional study reviewed medical records of children aged 4 to 48 months with attempted reduction of ileocolic intussusception at 86 pediatric tertiary care institutions in 14 countries from January 2017 to December 2019. Of 3555 eligible medical records, 352 were excluded, and 3203 medical records were eligible. Data were analyzed in August 2022. Exposures: Reduction of ileocolic intussusception. Main outcomes and measures: The primary outcomes were opioid analgesia within 120 minutes of reduction based on the therapeutic window of IV morphine and sedation immediately before reduction of intussusception. Results: We included 3203 patients (median [IQR] age, 17 [9-27] months; 2054 of 3203 [64.1%] males). Opioid use was documented in 395 of 3134 patients (12.6%), sedation 334 of 3161 patients (10.6%), and opioids plus sedation in 178 of 3134 patients (5.7%). Perforation was uncommon and occurred in 13 of 3203 patients (0.4%). In the unadjusted analysis, opioids plus sedation (odds ratio [OR], 5.92; 95% CI, 1.28-27.42; P = .02) and a greater number of reduction attempts (OR, 1.48; 95% CI, 1.03-2.11; P = .03) were significantly associated with perforation. In the adjusted analysis, neither of these covariates remained significant. Reductions were successful in 2700 of 3184 attempts (84.8%). In the unadjusted analysis, younger age, no pain assessment at triage, opioids, longer duration of symptoms, hydrostatic enema, and gastrointestinal anomaly were significantly associated with failed reduction. In the adjusted analysis, only younger age (OR, 1.05 per month; 95% CI, 1.03-1.06 per month; P < .001), shorter duration of symptoms (OR, 0.96 per hour; 95% CI, 0.94-0.99 per hour; P = .002), and gastrointestinal anomaly (OR, 6.50; 95% CI, 2.04-20.64; P = .002) remained significant. Conclusions and Relevance: This cross-sectional study of pediatric ileocolic intussusception found that more than two-thirds of patients received neither analgesia nor sedation. Neither was associated with intestinal perforation or failed reduction, challenging the widespread practice of withholding analgesia and sedation for reduction of ileocolic intussusception in children.

Febrile Urinary Tract Infection in Infants Less Than 3 Months of Age.

INTRODUCTION: Urinary tract infection (UTI) is the leading cause of bacterial infection in infants younger than 3 months of age with fever without a source. OBJECTIVE: The objective of the study was to analyze the characteristics of emergency department presentations of febrile infants younger than 3 months of age with a UTI and identify risk factors for invasive bacterial infection (IBI) secondary to UTI. METHODS: This was a secondary analysis of a prospective observational registry that includes infants younger than 3 months with fever without a source managed at a pediatric emergency department between 2003 and 2019. RESULTS: Of the 2850 patients included, 592 (20.8%) were diagnosed with a UTI (524, 88.5%, for Escherichia coli ). Infants with UTIs showed significant clinical differences when compared with those not diagnosed with a bacterial infection: patients with a UTI were more likely to have a history of renal/urological problems (8.3% vs. 3.5%), temperature ≥39ºC (38.3% vs. 29%) and poor feeding (13% vs. 8.7%). Yet, nearly half (285 of the 592, 48.1%) of the infants with febrile UTIs had none of these 3 risk factors. Thirty-six infants (6.1%) had a secondary IBI. We identified the following independent risk factors for secondary IBI: infants younger than 1 month of age, parent-reported irritability, procalcitonin >0.5 ng/mL, and C-reactive protein >60 mg/L. CONCLUSIONS: History and physical examination do not allow us to safely rule out a UTI among young febrile infants. Age, parent-reported irritability, and biomarkers are useful in identifying patients at increased risk of secondary IBI.

Setting priorities for an agenda within the Spanish pediatric emergency medicine research network.

The research network of the Spanish Pediatric Emergency Society (RISeuP-SPERG Network) needs to establish its research agenda relevant to pediatric emergency medicine (PEM) to guide the development of future projects, as other networks have done before. The aim of our study was to identify priority areas in PEM for a collaborative network of pediatric emergency research in Spain. A multicenter study was developed including pediatric emergency physicians from 54 Spanish emergency departments, endorsed by the RISeuP-SPERG Network. Initially, a group of seven PEM experts was selected among the members of the RISeuP-SPERG. In the first phase, these experts elaborated a list of research topics. Then, using a Delphi method, we sent a questionnaire with that list to all RISeuP-SPERG members, to rank each item using a 7-point Likert scale. Finally, the seven PEM experts, using a modified Hanlon Process of Prioritization, weighted prevalence (A), seriousness of the condition (B), and feasibility of conducting research projects (C) on that condition to prioritize the selected items. Once the list of topics was chosen, the seven experts selected a list of research questions for each of the selected items. The Delphi questionnaire was answered by 74/122 (60.7%) members of RISeuP-SPERG. We established a list of 38 research priorities related to quality improvement (11), infectious diseases (8), psychiatric/social emergencies (5), sedoanalgesia (3), critical care (2), respiratory emergencies (2), trauma (2), neurologic emergencies (1), and miscellanea (4).   Conclusion: The RISeuP-SPERG prioritization process identified high-priority PEM topics specific to multicenter research that may help guide further collaborative research efforts within the RISeuP-SPERG network to improve PEM care in Spain. What is Known: • Some pediatric emergency medicine networks have established their priorities for research. What is New: • After a structured process, we have set the research agenda for pediatric emergency medicine in Spain. By identifying high-priority pediatric emergency medicine research topics specific to multicenter research, we may guide further collaborative research efforts within our network.

Multicentre Delphi study of physicians resulted in quality indicators for young infants with fever without source in emergency departments.

AIM: Managing febrile infants has evolved without a generally accepted standard of care. We aimed to design quality indicators for managing infants ≤90 days old presenting to emergency departments (EDs) with fever without source. METHODS: This multicentre Delphi study was carried out by the Febrile Infant Study Group of the Spanish Paediatric Emergency Research Network, from March 2021 to November 2021, and included paediatric emergency physicians from 24 Spanish EDs. A list of care standards was produced, following an extensive literature review and the involvement of all parties. Indicators were essential if they were voted by four panelists and also received a score of ≥4 from at least 95% of the 24 investigators. RESULTS: We established 20 indicators, including one related to having a protocol, two to triage, nine to diagnostic processes, six to treatment and two to disposition. The following indicators were considered essential: having an ED management protocol, performing urinalysis on every infant, obtaining a blood culture from every infant and administering antibiotics in the ED to any febrile infant who did not appear well. CONCLUSION: The Delphi method resulted in a comprehensive list of quality indicators for managing febrile young infants in Spanish EDs.

Parental help-seeking behaviour for, and care of, a sick or injured child during the COVID-19 pandemic: a European online survey.

BACKGROUND: Globally, the COVID-19 pandemic had a huge impact on patients and healthcare systems. A decline in paediatric visits to healthcare settings was observed, which might have been due to lower incidence of injury and infectious illness, changes in healthcare services and parental concern. The aim of our study was to examine parental experiences of help-seeking for, and care of, a sick or injured child during COVID-19 lockdown periods in five European countries with different healthcare systems in place. METHODS: An online survey for parents with a child with any kind or illness of injury during COVID-19 lockdowns was circulated through social media in five European countries: Italy, Spain, Sweden, the Netherlands, and the United Kingdom. Parents living in one of these countries with self-identification of a sick or injured child during COVID-19 lockdown periods were eligible to fill in the survey. Descriptive statistics were used for the level of restrictions per country, children's characteristics, family characteristics and reported help-seeking behaviour of parents prior to the lockdown and their real experience during the lockdown. The free text data was subjected to thematic analysis. RESULTS: The survey was fully completed by 598 parents, ranging from 50 to 198 parents per country, during varying lockdown periods from March 2020 until May 2022. Parents who completed the survey were not deterred from seeking medical help for their sick or injured child during the COVID-19 pandemic. This finding was comparable in five European countries with different healthcare systems in place. Thematic analysis identified three main areas: parental experiences of access to healthcare, changes in parents' help-seeking behaviours for a sick or injured child during lockdowns, and the impact of caring for a sick or injured child during the lockdowns. Parents reported limited access to non-urgent care services and were anxious about either their child or themselves catching COVID-19. CONCLUSION: This insight into parental perspectives of help-seeking behaviour and care for a sick or injured child during COVID-19 lockdowns could inform future strategies to improve access to healthcare, and to provide parents with adequate information concerning when and where to seek help and support during pandemics.

Safety of ketamine for reducing fractures in a pediatric emergency department. / Seguridad del uso de ketamina para reducir fracturas en un servicio de urgencias pediátrico.

OBJECTIVES: Ketamine is one of the most widely used drugs for analgesia and sedation when reducing fractures in pediatric emergency departments (EDs). We aimed to analyze the safety of intravenous (IV) ketamine when administered by physicians who are not anesthesiologists. MATERIAL AND METHODS: Prospective observational study of adverse events (AEs) related to pediatric ED specialists' use of analgesia and sedation when reducing fractures in children under the age of 14 years between 2011 and 2019. Multivariate analysis was used to identify independent risk factors for AEs. RESULTS: We analyzed 1509 cases of IV ketamine administration for analgesia and sedation. The median age of patients was 8 years (interquartile range, 5-11 years). All had American Society of Anesthesiologists risk classifications of 1 or 2 and Mallampati scores of I or II. Prior to the procedure, 937 children (62.1%) had been administered an opioid analgesic. AEs were observed in 201 children (13.3%; 95% CI, 11.7%-15.1%); 71 experienced respiratory complications (4.7%; 95% CI, 3.2%-5.3%). No child required intubation, other advanced resuscitation maneuvers, or hospital admission because of a ketamine-related AE. Age was the only independent risk factor for developing an AE. The odds ratio (OR) for any type of AE in children aged 8 years or older was 1.9 (95% CI, 1.4-2.6). The OR for respiratory AEs in children aged 6 years or older was 2.6 (95% CI, 1.3-5.6). Opioid administration did not increase risk for AEs. CONCLUSION: Pediatric emergency physicians who are not anesthesiologists can safely administer IV ketamine for reducing fractures. Prior use of opioids is not associated with greater risk for respiratory AEs after ketamine use.

OBJETIVO: La ketamina es uno de los fármacos más utilizados para reducir fracturas en los servicios de urgencias de pediatría (SUP). Se analiza la seguridad de ketamina por médicos no anestesistas en reducciones de fracturas en un SUP. METODO: Estudio prospectivo observacional sobre los efectos adversos (EA) relacionados con procedimientos de analgesia y sedación (PAS) realizados por pediatras de urgencias para reducir fracturas en menores de 14 años en un SUP entre 2011 y 2019. Se realizó un análisis multivariante para identificar factores de riesgo independientes de EA. RESULTADOS: Se analizaron 1.509 PAS con ketamina intravenosa (iv). La mediana de edad fue de 8 años (RIC 5-11), todos con una clasificación American Academy of Anesthesiologists (ASA) I o II y Mallampati I o II. Previo al procedimiento, 937 (62,1%), recibieron opioides. Se registraron EA en 201 (13,3%; IC 95%: 11,7-15,1), 71 respiratorios (4,7%; IC 95%: 3,2-5,3). Ningún niño requirió intubación, otras maniobras de reanimación avanzada o ingreso por un problema secundario al PAS. La edad fue el único factor de riesgo independiente para presentar tanto EA de manera global ( 8 años OR 1,9; IC 95%: 1,4-2,6) como respiratorios ( 6 años OR 2,6; IC 95%: 1,3-5,6). La administración de opioide no se relacionó con mayor riesgo de presentar tanto EA de manera global como respiratorios. CONCLUSIONES: Los PAS con ketamina iv realizados por médicos no anestesistas para reduccir fracturas en urgencias en niños son seguros. La administración previa de opioides no se asocia a mayor riesgo de EA respiratorios.

Seguridad del uso de ketamina para reducir fracturas en un servicio de urgencias pediátrico / Safety of ketamine for reducing fractures in a pediatric emergency department

Introducción. La ketamina es uno de los fármacos más utilizados para reducir fracturas en los servicios de urgencias de pediatría (SUP). Se analiza la seguridad de ketamina por médicos no anestesistas en reducciones de fracturas en un SUP.Métodos. Estudio prospectivo observacional sobre los efectos adversos (EA) relacionados con procedimientos de analgesia y sedación (PAS) realizados por pediatras de urgencias para reducir fracturas en menores de 14 años en un SUP entre 2011 y 2019. Se realizó un análisis multivariante para identificar factores de riesgo independientes de EA.Resultados. Se analizaron 1.509 PAS con ketamina intravenosa (iv). La mediana de edad fue de 8 años (RIC 5-11), todos con una clasificación American Academy of Anesthesiologists (ASA) I o II y Mallampati I o II. Previo al procedimiento, 937 (62,1%), recibieron opioides. Se registraron EA en 201 (13,3%; IC 95%: 11,7-15,1), 71 respiratorios (4,7%; IC 95%: 3,2-5,3). Ningún niño requirió intubación, otras maniobras de reanimación avanzada o ingreso por un problema secundario al PAS. La edad fue el único factor de riesgo independiente para presentar tanto EA de manera global ($ 8 años OR 1,9; IC 95%: 1,4-2,6) como respiratorios ($ 6 años OR 2,6; IC 95%: 1,3-5,6). La administración de opioide no se relacionó con mayor riesgo de presentar tanto EA de manera global como respiratorios.Conclusiones. Los PAS con ketamina iv realizados por médicos no anestesistas para reducir fracturas en urgencias en niños son seguros. La administración previa de opioides no se asocia a mayor riesgo de EA respiratorios. (AU)

Background and objective. Ketamine is one of the most widely used drugs for analgesia and sedation when reducing fractures in pediatric emergency departments (EDs). We aimed to analyze the safety of intravenous (IV) ketamine when administered by physicians who are not anesthesiologists.Methods. Prospective observational study of adverse events (AEs) related to pediatric ED specialists’ use of analgesia and sedation when reducing fractures in children under the age of 14 years between 2011 and 2019. Multivariate analysis was used to identify independent risk factors for AEs.Results. We analyzed 1509 cases of IV ketamine administration for analgesia and sedation. The median age of patients was 8 years (interquartile range, 5-11 years). All had American Society of Anesthesiologists risk classifications of 1 or 2 and Mallampati scores of I or II. Prior to the procedure, 937 children (62.1%) had been administered an opioid analgesic. AEs were observed in 201 children (13.3%; 95% CI, 11.7% 15.1%); 71 experienced respiratory complications (4.7%; 95% CI, 3.2%-5.3%). No child required intubation, other advanced resuscitation maneuvers, or hospital admission because of a ketamine-related AE. Age was the only independent risk factor for developing an AE. The odds ratio (OR) for any type of AE in children aged 8 years or older was 1.9 (95% CI, 1.4-2.6). The OR for respiratory AEs in children aged 6 years or older was 2.6 (95% CI, 1.3-5.6). Opioid administration did not increase risk for AEs.Conclusions. Pediatric emergency physicians who are not anesthesiologists can safely administer IV ketamine for reducing fractures. Prior use of opioids is not associated with greater risk for respiratory AEs after ketamine use. (AU)