Pharmacologic Procedural Distress Management During Laceration Repair in Children: A Systematic Review.

OBJECTIVES: To systematically appraise the literature on the relative effectiveness of pharmacologic procedural distress management agents for children undergoing laceration repair. METHODS: Six databases were searched in August 2021, and the search was updated in January 2023. We included completed randomized or quasi-randomized trials involving ( a ) children younger than 15 years undergoing laceration repair in the emergency department; ( b ) randomization to at least one anxiolytic, sedative, and/or analgesic agent versus any comparator agent or placebo; ( c ) efficacy of procedural distress management measured on any scale. Secondary outcomes were pain during the procedure, administration acceptance, sedation duration, additional sedation, length of stay, and stakeholder satisfaction. Cochrane Collaboration's risk-of-bias tool assessed individual studies. Ranges and proportions summarized results where applicable. RESULTS: Among 21 trials (n = 1621 participants), the most commonly studied anxiolytic agents were midazolam, ketamine, and N 2 O. Oral midazolam, oral ketamine, and N 2 O were found to reduce procedural distress more effectively than their comparators in 4, 3, and 2 studies, respectively. Eight studies comparing routes, doses, or volumes of administration of the same agent led to indeterminate results. Meta-analysis was not performed because of heterogeneity in comparators, routes, and outcome measures across studies. CONCLUSIONS: Based on procedural distress reduction, this study favors oral midazolam and oral ketamine. However, this finding should be interpreted with caution because of heterogeneous comparators across studies and minor conflicting results. An optimal agent for procedural distress management cannot be recommended based on the limited evidence. Future research should seek to identify the minimal, essential measures of patient distress during pharmacologic anxiolysis and/or sedation in laceration repair to guide future trials and reviews.

Healthcare professionals' perspectives on optimizing pain care-related education at a Canadian children's hospital: A qualitative study.

Objectives: Pain affects all children and youth, yet acute and procedural pain remains undertreated in Canadian hospitals. To improve pain management practices in paediatric hospitals, it is necessary to understand how healthcare professionals (HCPs) wish for educational interventions to be designed to improve their pain management practice. Methods: Semi-structured interviews were conducted with 18 HCPs between October and December 2020. Snowball sampling was used to first recruit interested members from the hospital's Pediatric Pain Management Committee. Interviews were conducted per participant preference and included Zoom, telephone, and in-person interviews. Recruitment ceased when data were determined sufficiently rich. A thematic analysis of verbatim transcripts and reflexive field notes were used to create a data set focused on knowledge mobilization and clinical education. Results: Three core themes were identified: (a) the necessity for just-in-time education for HCPs; (b) the availability of clinical pain champions to educate staff; and (c) the provision of resources to educate children and their families about available pain management interventions. Just-in-time education included suggestions for in-service training, hands-on training, and regular updates on the latest research. Pain champions, including clinical nurse educators, were stressed as being important in motivating staff to improve their pain management practices. Participants noted the lack of resources for patient and family education on pain management and suggested providing more multimodal resources and educational opportunities. Conclusion: Having local champions introduce pain management initiatives and just-in-time education positively impacts the implementation climate, which also helps HCPs provide evidence-based education and resources to patients and families.

Creating a Low-Stimulus Clinic to improve immunization success rates for children with alternate environment needs: A quality improvement initiative.

Patients with specific sensory needs may face barriers to receiving their immunizations. Therefore, a Low-Stimulus Clinic was created in Alberta. Modifications to regular clinic space included lower visual and auditory input, access to longer appointment times and private clinic spaces, development of pre-appointment comfort plans, and offering of in-vehicle immunization. Between April 2021 and May 2022, 90% (641/712) of booked patients were successfully immunized. The top reasons for accessing the clinic included autism spectrum disorder (229/712, 32%), and needle fear/phobia (195/712, 27%). The Low-Stimulus Clinic had a high rate of successful vaccination for populations that may otherwise have been less likely to receive immunizations. Its workflows support the principles of choice, collaboration, and control in creating a positive immunization experience for patients and their families. Having such clinics widely available is a key step in reducing barriers to accessing vaccines for individuals with specific sensory needs.

Factors Influencing Parental Decision-Making Regarding Analgesia for Children with Musculoskeletal Injury-Related Pain: A Qualitative Study.

OBJECTIVES: To explore and understand parental decision-making relating to acute pain management for their children presenting to the emergency department. STUDY DESIGN: This study employed one-on-one semistructured interviews. Parents of children with acute musculoskeletal injuries were recruited from 3 Canadian pediatric emergency departments. Interviews were conducted via telephone from June 2019 to March 2021. Verbatim transcription and thematic analyses occurred concurrently with data collection, supporting data saturation and theory development considerations. RESULTS: Twenty-seven interviews were completed. Five major themes regarding pain care emerged: (1) my child's comfort is a priority, (2) every situation is unique, (3) opioids only if necessary, (4) considerations when choosing opioids, and (5) pain research is important. Overall, parents were highly comfortable with their assessment of their child's pain. Participants' willingness to use opioid analgesia for their children was primarily dependent on perceptions of injury and pain severity. Opioid-averse and opioid-accepting families had similar considerations when making analgesic decisions but weighed risks and benefits differently. CONCLUSIONS: Parents assess and manage their children's pain globally and multimodally, with comfort being prioritized. For most parents, the desire to relieve their children's pain outweighed concerns of substance use disorder, misuse, and adverse events when making decisions about opioid analgesia for short-term use. These results can inform evidence-based family-centered approaches to co-decision-making of analgesic plans for children with acute pain.

Molecular epidemiology of rotavirus among children in Western Canada: Dynamic changes in genotype prevalence in four consecutive seasons.

Rotavirus molecular surveillance remains important in the postvaccine era to monitor the changes in transmission patterns, identify vaccine-induced antigenic changes and discover potentially pathogenic vaccine-related strains. The Canadian province of Alberta introduced rotavirus vaccination into its provincial vaccination schedule in June 2015. To evaluate the impact of this program on stool rotavirus positivity rate, strain diversity, and seasonal trends, we analyzed a prospective cohort of children with acute gastroenteritis recruited between December 2014 and August 2018. We identified dynamic changes in rotavirus positivity and genotype trends during pre- and post-rotavirus vaccine introduction periods. Genotypes G9P[8], G1P[8], G2P[4], and G12P[8] predominated consecutively each season with overall lower rotavirus incidence rates in 2016 and 2017. The demographic and clinical features of rotavirus gastroenteritis were comparable among wild-type rotaviruses; however, children with G12P[8] infections were older (p < 0.001). Continued efforts to monitor changes in the molecular epidemiology of rotavirus using whole genome sequence characterization are needed to further understand the impact of the selection pressure of vaccination on rotavirus evolution.

Emergency department visits and hospital admissions for suicidal ideation, self-poisoning and self-harm among adolescents in Canada during the COVID-19 pandemic.

BACKGROUND: The COVID-19 pandemic had profound effects on the mental wellbeing of adolescents. We sought to evaluate pandemic-related changes in health care use for suicidal ideation, self-poisoning and self-harm. METHODS: We obtained data from the Canadian Institute for Health Information on emergency department visits and hospital admissions from April 2015 to March 2022 among adolescents aged 10-18 years in Canada. We calculated the quarterly percentage of emergency department visits and hospital admissions for a composite outcome comprising suicidal ideation, self-poisoning and self-harm relative to all-cause emergency department visits and hospital admissions. We used interrupted time-series methods to compare changes in levels and trends of these outcomes between the prepandemic (Apr. 1, 2015-Mar. 1, 2020) and pandemic (Apr. 1, 2020-Mar. 31, 2022) periods. RESULTS: The average quarterly percentage of emergency department visits for suicidal ideation, self-poisoning and self-harm relative to all-cause emergency department visits was 2.30% during the prepandemic period and 3.52% during the pandemic period. The level (0.08%, 95% confidence interval [CI] -0.79% to 0.95%) or trend (0.07% per quarter, 95% CI -0.14% to 0.28%) of this percentage did not change significantly between periods. The average quarterly percentage of hospital admissions for the composite outcome relative to all-cause admissions was 7.18% during the prepandemic period and 8.96% during the pandemic period. This percentage showed no significant change in level (-0.70%, 95% CI -1.90% to 0.50%), but did show a significantly increasing trend (0.36% per quarter; 95% 0.07% to 0.65%) during the pandemic versus prepandemic periods, specifically among females aged 10-14 years (0.76% per quarter, 95% CI 0.22% to 1.30%) and females aged 15-18 years (0.56% per quarter, 95% CI 0.31% to 0.81%). INTERPRETATION: The quarterly change in the percentage of hospital admissions for suicidal ideation, self-poisoning and self-harm increased among adolescent females in Canada during the first 2 years of the COVID-19 pandemic. This underscores the need to promote public health policies that mitigate the impact of the pandemic on adolescent mental health.

Optimal Dose of Intranasal Dexmedetomidine for Laceration Repair in Children: A Phase II Dose-Ranging Study.

STUDY OBJECTIVE: To determine the optimal sedative dose of intranasal dexmedetomidine for children undergoing laceration repair. METHODS: This dose-ranging study employing the Bayesian Continual Reassessment Method enrolled children aged 0 to 10 years with a single laceration (<5 cm), requiring single-layer closure, who received topical anesthetic. Children were administered 1, 2, 3, or 4 mcg/kg intranasal dexmedetomidine. The primary outcome was the proportion with adequate sedation (Pediatric Sedation State Scale score of 2 or 3 for ≥90% of the time from sterile preparation to tying of the last suture). Secondary outcomes included the Observational Scale of Behavior Distress-Revised (range: 0 [no distress] to 23.5 [maximal distress]), postprocedure length of stay, and adverse events. RESULTS: We enrolled 55 children (35/55 [64%] males; median [interquartile range {IQR}] age 4 [2, 6] years). At 1, 2, 3, and 4 mcg/kg intranasal dexmedetomidine, respectively, the proportion of participants "adequately" sedated was 1/3 (33%), 2/9 (22%), 13/21 (62%), and 12/21 (57%); the posterior mean (95% equitailed credible intervals) for the probability of adequate sedation was 0.38 (0.04, 0.82), 0.25 (0.05, 0.54), 0.61 (0.41, 0.80), and 0.57 (0.36, 0.76); the median (IQR) Observational Scale of Behavior Distress-Revised scores during suturing was 2.7 (0.3, 3), 0 (0, 3.8), 0.6 (0, 5), and 0 (0, 3.7); the median (IQR) postprocedure length of stay was 67 (60, 78), 76 (60, 100), 89 (76, 109), and 113 (76, 150) minutes. There was 1 adverse event, a decrease in oxygen saturation at 4 mcg/kg, which resolved with head repositioning. CONCLUSION: Despite limitations, such as our limited sample size and subjectivity in Pediatric Sedation State Scale scoring, sedation efficacy for 3 and 4 mcg/kg were similarly based on equitailed credible intervals suggesting either could be considered optimal.

Characterizing the Pain Experience of Children With Acute Gastroenteritis Based on Identified Pathogens.

OBJECTIVES: Pain is common with acute gastroenteritis (AGE) yet little is known about the severity associated with specific enteropathogens. We sought to explore the correlation of pain severity with specific enteropathogens in children with AGE. METHODS: Participants were prospectively recruited by the Alberta Provincial Pediatric EnTeric Infection TEam at 2 pediatric emergency departments (EDs) (December 2014-August 2018). Pain was measured (by child and/or caregiver) using the 11-point Verbal Numerical Rating Scale. RESULTS: We recruited 2686 participants; 46.8% (n = 1256) females, with median age 20.1 months (interquartile range 10.3, 45.3). The mean highest pain scores were 5.5 [standard deviation (SD) 3.0] and 4.2 (SD 2.9) in the 24 hours preceding the ED visit, and in the ED, respectively. Prior to ED visit, the mean highest pain scores with bacterial detection were 6.6 (SD 2.5), compared to 5.5 (SD 2.9) for single virus and 5.5 (SD 3.1) for negative stool tests. In the ED, the mean highest pain scores with bacterial detection were 5.5 (SD 2.7), compared to 4.1 (SD 2.9) for single virus and 4.2 (SD 3.0) for negative stool tests. Using multivariable modeling, factors associated with greater pain severity prior to ED visit included older age, fever, illness duration, number of diarrheal or vomiting episodes in the preceding 24 hours, and respiratory symptoms, but not enteropathogen type. CONCLUSION: Children with AGE experience significant pain, particularly when the episode is associated with the presence of a bacterial enteric pathogen. However, older age and fever appear to influence children's pain experiences more than etiologic pathogens.

Adolescent and Caregiver Perspectives on Living With a Limb Fracture: A Qualitative Study.

BACKGROUND: Fractures occur in up to half of children by age 16 years. After initial emergency care for a fracture, function is universally impaired in children, and impacts extend to the immediate family. Knowledge of expected functional limitations is key to providing proper discharge instructions and anticipatory guidance to families. OBJECTIVES: The primary objective of this study was to understand how changes in functional ability impact youth with fractures. METHODS: We conducted individual, semistructured interviews from June 2019 to November 2020 with adolescents and their caregivers 7 to 14 days following their initial visit to a pediatric emergency department. We used qualitative content analysis methodology; recruitment proceeded until thematic saturation was achieved. Coding and analysis were concurrent with recruitment and interviews. The interview script was modified in an iterative process, to reflect emerging themes. RESULTS: Twenty-nine interviews were completed. The most frequently affected functions were ( a ) showering and hygiene (requiring the most caregiver support), ( b ) sleep (due to pain and cast-related discomfort), and ( c ) exclusion from sports/activities. Many adolescents experienced disruptions to social activities and gatherings. Youth valued independence and took more time to complete tasks, regardless of inconvenience. Both adolescents and caregivers reported feelings of frustration from day-to-day impacts of the injury. Generally, caregivers' perspectives were in keeping with the experiences that adolescents described for themselves. Notable family impacts included "sibling burden," or conflicts that arose when a sibling had to take on extra chores/tasks. CONCLUSIONS: Overall, caregivers' perspectives were congruent with the self-described experiences of adolescents. Key messages for optimized discharge instructions include pain and sleep management, allowing extra time to complete tasks independently, considering impact on siblings, preparing for changes in activities and social dynamics, and normalizing frustration. These themes highlight an opportunity to better tailor discharge instructions for adolescents with fractures.

What Are the Care Needs of Families Experiencing Sudden Cardiac Arrest? A Survivor- and Family-Performed Systematic Review, Qualitative Meta-Synthesis, and Clinical Practice Recommendations.

INTRODUCTION: Cardiac arrest care systems are being designed and implemented to address patients', family members', and survivors' care needs. We conducted a systematic review and a meta-synthesis to understand family experiences and care needs during cardiac arrest care to create treatment recommendations. METHODS: We searched eight electronic databases to identify articles. Study findings were extracted, coded and synthesized. Confidence in the quality, coherence, relevance, and adequacy of data underpinning the resulting findings was assessed using GRADE-CERQual methods. RESULTS: In total 4181 studies were screened, and 39 met our inclusion criteria; these studies enrolled 215 survivors and 418 family participants-which includes both co-survivors and bereaved family members. From these studies findings and participant data we identified 5 major analytical themes: (1) When the crisis begins we must respond; (2) Anguish from uncertainty, we need to understand; (3) Partnering in care, we have much to offer; (4) The crisis surrounding the victim, ignore us, the family, no longer; (5) Our family's emergency is not over, now is when we need help the most. Confidence in the evidence statements are provided along with our review findings. DISCUSSION: The family experience of cardiac arrest care is often chaotic, distressing, complex and the aftereffects are long-lasting. Patient and family experiences could be improved for many people. High certainty family care needs identified in this review include rapid recognition and response, improved information sharing, more effective communication, supported presence and participation, or supported absence, and psychological aftercare.

Clinical Profiles of Childhood Astrovirus-, Sapovirus-, and Norovirus-Associated Acute Gastroenteritis in Pediatric Emergency Departments in Alberta, 2014-2018.

BACKGROUND: Infections by previously underdiagnosed viruses astrovirus and sapovirus are poorly characterized compared with norovirus, the most common cause of acute gastroenteritis. METHODS: Children <18 years old with acute gastroenteritis were recruited from pediatric emergency departments in Alberta, Canada between 2014 and 2018. We described and compared the clinical course of acute gastroenteritis in children with astrovirus, sapovirus, and norovirus. RESULTS: Astrovirus was detected in 56 of 2688 (2.1%) children, sapovirus was detected in 146 of 2688 (5.4%) children, and norovirus was detected in 486 of 2688 (18.1%) children. At illness onset, ~60% of astrovirus cases experienced both diarrhea and vomiting. Among sapovirus and norovirus cases, 35% experienced diarrhea at onset and 80% of 91% (sapovirus/norovirus) vomited; however, diarrhea became more prevalent than vomiting at approximately day 4 of illness. Over the full course of illness, diarrhea was 18% (95% confidence interval [CI], 8%- 29%) more prevalent among children with astrovirus than norovirus infections and had longer duration with greater maximal events; there were a median of 4.0 fewer maximal vomiting events (95% CI, 2.0-5.0). Vomiting continued for a median of 24.8 hours longer (95% CI, 9.6-31.7) among children with sapovirus versus norovirus. Differences between these viruses were otherwise minimal. CONCLUSIONS: Sapovirus infections attended in the emergency department are more similar to norovirus than previously reported, whereas astrovirus infections have several distinguishable characteristics.

A randomized trial of ketorolac and metoclopramide for migraine in the emergency department.

OBJECTIVE: The objective of this study was to assess the efficacy and safety of a common monotherapy (intravenous [iv] metoclopramide) compared to a combination strategy (adding iv ketorolac to metoclopramide) in children presenting for acute treatment of migraine headache in the emergency department (ED). METHODS: Children aged 5-17 years presenting for acute treatment of migraine headache at two pediatric EDs were enrolled in a double-blind randomized controlled trial. Children were randomly assigned to receive iv metoclopramide 0.2 mg/kg) and placebo or iv metoclopramide (0.2 mg/kg) and ketorolac (0.5 mg/kg). The primary outcome was a mean change in pain from baseline to 120 min via a 100 mm Visual Analog Scale (VAS). Follow-up was conducted 24-h after discharge. RESULTS: Fifty-three children were randomized and included in the analysis (monotherapy group [metoclopramide + placebo], n = 27; and ketorolac group [metoclopramide + ketorolac], n = 26); mean age was 12.9 ± 2.7 years and baseline pain severity on VAS was 67.3 ± 2.7 mm. The mean change in pain intensity at 120 min was -44 mm (SD: 24; 95% confidence interval [CI]: 32-57) for the monotherapy group and -36 mm (SD: 24; 95% CI: 23-49) for the ketorolac group, with a mean difference between groups of 8 mm (95% CI: -9-25; p = 0.360). Seventeen percent of the children (9/53; 95% CI: 7-27%) were pain-free at discharge. There was no difference in headache recurrence or adverse events between groups. CONCLUSIONS: The approach of combining iv metoclopramide with ketorolac failed to improve pain scores in children presenting for acute treatment of migraine headache in the ED compared to metoclopramide monotherapy. Most patients were discharged with residual pain. Further comparative studies are needed to test alternative ED treatments for migraine in children or adolescents.

The relationship between nitrous oxide sedation and psychosocial factors in the pediatric outpatient setting.

BACKGROUND: Moderate sedation using nitrous oxide (N2 O) has become common in pediatric dentistry. However, less is known regarding the role of patients' characteristics and psychosocial factors in their cooperative behavior during dental procedures with N2 O. AIMS: This study aimed to examine pediatric dental patients' behaviors while undergoing N2 O sedation and to measure the associations between child's cooperative behavior and demographic, physiological responses, and psychosocial factors. METHODS: In this within-subject observational study, participants received 40% N2 O/O2 , by nasal hood, for non-surgical dental procedures. The main outcome measure was the extent of cooperative behaviors, as assessed by the Frankl scale at five timepoints, namely T1: pre-administration of N2 O, T2: post-administration of N2 O, T3: dental injection, T4: dental treatment, and T5: post-procedure administration of 100% O2 . Predictors included age, sex, psychosocial factors reported using the Parenting Style and Dimension Questionnaire and Spence Children Anxiety Scale, as well as pulse rate, respiratory rate, and oxygen saturation. The Wilcoxon signed-rank test and generalized estimation equation were used for data analyses. RESULTS: In 80 children with a mean age of 7.2 (2.2) years, administration of N2 O was significantly associated with cooperative behaviors (odds ratio [OR]:2.62, confidence interval [CI]: 1.46-4.70, p = .001) when adjusted for other predictors. There was no interaction between any of the predictors and N2 O sedation on behaviors. Except for the authoritative parenting style (OR: 1.96, CI: 1.16-3.31, p = .012), which predicted more cooperative behaviors, other predictors were not associated with behavioral outcomes. CONCLUSION: In children sedated with N2 O, behavior was independent of the child's demographic and psychosocial factors. While sedated, demographics, vital signs, and anxiety did not contribute to behavior management. However, screening for parenting style may help predict the child's behavioral response.

Parental Perspectives on Children's Functional Experiences After Limb Fracture: A Qualitative Study.

BACKGROUND: Fractures are a common childhood injury. Although the pain associated with fractures is well described, the related functional impact is less understood. When a child's function is impaired, his or her ability to participate in day-to-day life is restricted. Eighty percent of children with fractures experience compromise in daily function. An in-depth understanding of function can guide emergency department (ED) providers' discharge instructions. OBJECTIVES: Our aim was to report caregivers' perspectives of the functional impact of limb fractures on their children's day-to-day life activities. METHODS: We performed a qualitative study using interviews of caregivers of children (aged 5 to 11 years) who received care for acute, nonoperative long bone fractures in a pediatric ED. Audio-recorded, semistructured telephone interviews were completed 7 to 14 days after the ED visit. Interviews were primarily open ended, including questions targeting areas of function from existing pediatric fracture literature. Qualitative analysis was completed using content analysis. RESULTS: Twenty-five interviews were included in the final analysis. Most of the children were diagnosed with upper extremity fractures, and most participants were mothers. All parents reported a change in their child's function. The most commonly affected areas were sleep, activities of daily living, and play. Play was either self-limited by the child or restricted by the parent. Pain was worse in the first days after discharge. Many children struggled emotionally with functional limitations. All children required help from their parents to perform daily tasks; this required adaptive strategies such as planning, changes to household routine, and missed work. Key concerns from parents included regression in the child's independence and fracture healing and complications. CONCLUSIONS: Function is universally impaired in young children with fractures, significantly affecting family life after discharge. Discharge conversations with families should include pain management, changes to activities of daily living, family routines and play, and expectations for fracture healing.

Best practices in pain assessment and management for children.

Pain assessment and management are essential components of paediatric care. Developmentally appropriate pain assessment is an important first step in optimizing pain management. Self-reported pain should be prioritized. Alternatively, developmentally appropriate behavioural tools should be used. Acute pain management and prevention guidelines and strategies that combine physical, psychological, and pharmacological approaches should be accessible in all health care settings. Chronic pain is best managed using combined treatment modalities and counselling, with the primary goal of attaining functional improvement. The planning and implementation of pain management strategies for children should always be personalized and family-centred.

Les pratiques exemplaires pour l'évaluation et le traitement de la douleur chez les enfants.

L'évaluation et le traitement de la douleur sont des aspects essentiels des soins pédiatriques. L'évaluation de la douleur adaptée au développement représente une première étape importante pour en optimiser la prise en charge. L'autoévaluation de la douleur est à prioriser. Si c'est impossible, des outils appropriés d'évaluation du comportement, adaptés au développement, doivent être utilisés. Des directives et stratégies de prise en charge et de prévention de la douleur aiguë, qui combinent des approches physiques, psychologiques et pharmacologiques, doivent être accessibles dans tous les milieux de soins. Le meilleur traitement de la douleur chronique fait appel à une combinaison de modalités thérapeutiques et de counseling, dans l'objectif premier d'obtenir une amélioration fonctionnelle. La planification et la mise en œuvre de stratégies de prise en charge de la douleur chez les enfants doivent toujours être personnalisées et axées sur la famille.

Attribution of Pediatric Acute Gastroenteritis Episodes and Emergency Department Visits to Norovirus Genogroups I and II.

BACKGROUND: Norovirus is a leading cause of acute gastroenteritis. With vaccines in development, population-based estimates of norovirus burden are needed to identify target populations, quantify potential benefits, and understand disease dynamics. METHODS: We estimated the attributable fraction (AF) for norovirus infections in children, defined as the proportion of children testing positive for norovirus whose gastroenteritis was attributable to norovirus. We calculated the standardized incidence and emergency department (ED) visit rates attributable to norovirus using provincial gastroenteritis visit administrative data. RESULTS: From 3731 gastroenteritis case patients and 2135 controls we determined that the AFs were 67.0% (95% confidence interval [CI], 31.5%-100%) and 91.6% (88.8%-94.4%) for norovirus genogroups I (GI) and II (GII), respectively. Norovirus GII AF varied by season but not age. We attributed 116 episodes (95% CI, 103-129) and 59 (51-67) ED visits per 10 000 child-years to norovirus GII across all ages, accounting for 20% and 18% of all medically attended gastroenteritis episodes and ED visits, respectively. CONCLUSIONS: In children, a large proportion of norovirus GII detections reflect causation, demonstrating significant potential for norovirus GII vaccines. Seasonal variation in the norovirus GII AF may have implications for understanding the role asymptomatic carriage plays in disease dynamics.

Microbial Etiologies and Clinical Characteristics of Children Seeking Emergency Department Care Due to Vomiting in the Absence of Diarrhea.

BACKGROUND: As children with isolated vomiting are rarely able to provide a specimen suitable for routine pathogen testing, we have limited knowledge about their infecting pathogens. METHODS: Between December 2014 and August 2018, children <18 years old with presumed acute gastroenteritis who presented to 2 emergency departments (EDs) in Alberta, Canada, were recruited. Eligible participants had ≥3 episodes of vomiting and/or diarrhea in a 24-hour period, <7 days of symptoms, and provided a rectal swab or stool specimen. We quantified the proportion of children with isolated vomiting in whom an enteropathogen was identified, and analyzed clinical characteristics, types of enteropathogens, resources used, and alternative diagnoses. RESULTS: Of the 2695 participants, at the ED visit, 295 (10.9%), 1321 (49.0%), and 1079 (40.0%) reported having isolated diarrhea, vomiting and diarrhea, or isolated vomiting, respectively. An enteropathogen was detected most commonly in those with vomiting and diarrhea (1067/1321; 80.8%); detection did not differ between those with isolated diarrhea (170/295; 57.6%) and isolated vomiting (589/1079; 54.6%) (95% confidence interval of the difference: -3.4%, 9.3%). Children with isolated vomiting most often had a virus (557/1077; 51.7%), most commonly norovirus (321/1077; 29.8%); 5.7% (62/1079) had a bacterial pathogen. X-rays, ultrasounds, and urine tests were most commonly performed in children with isolated vomiting. Alternate etiologies were most common in those with isolated vomiting (5.7%; 61/1079). CONCLUSIONS: The rate of enteropathogen identification in children with isolated vomiting using molecular diagnostic tests and rectal swabs is substantial. Molecular diagnostics offer an emerging diagnostic strategy in children with isolated vomiting.

Molecular Epidemiology of Human Sapovirus among Children with Acute Gastroenteritis in Western Canada.

Sapovirus is increasingly recognized as an important cause of acute gastroenteritis (AGE) worldwide; however, studies of sapovirus prevalence, genetic diversity, and strain-specific clinical implications have been scarce. To fill this knowledge gap, we used reverse transcription-real-time PCR and sequencing of the partial major capsid protein VP1 gene to analyze stool specimens and rectal swabs obtained from 3,347 children with AGE and 1,355 asymptomatic controls (all <18 years old) collected between December 2014 and August 2018 in Alberta, Canada. Sapovirus was identified in 9.5% (317/3347) of the children with AGE and 2.9% of controls. GI.1 (36%) was the predominant genotype identified, followed by GI.2 (18%), GII.5 (8%), and GII.3 (6%). Rare genotypes GII.1, GII.2, GV.1, GII.4, GIV.1, GI.3, and GI.7 were also seen. Sapovirus was detected year-round, peaking during the winter months of November to January. The exception was the 2016-2017 season, when GI.2 overtook GI.1 as the predominant strain, with a high detection rate persisting into April. We did not observe significant difference in the severity of gastroenteritis by genogroup or genotype. Repeated infection by sapovirus of different genogroups occurred in three controls who developed AGE later. Our data suggest that sapovirus is a common cause of AGE in children with high genetic diversity.

Detection and Clinical Implications of Monovalent Rotavirus Vaccine-Derived Virus Strains in Children with Gastroenteritis in Alberta, Canada.

While rotavirus vaccine programs effectively protect against severe rotavirus gastroenteritis, rotavirus vaccine strains have been identified in the stool of vaccinated children and their close contacts suffering from acute gastroenteritis. The prevalence of vaccine strains, the emergence of vaccine-derived strains, and their role in acute gastroenteritis are not well studied. We developed a locked nucleic acid reverse transcription real-time PCR assay (LNA-RTqPCR) to detect the monovalent rotavirus vaccine (RV1) Rotarix nonstructural protein 2 (NSP2) in children with acute gastroenteritis and healthy controls, and validated it using sequence-confirmed RV1 strains. The association between RV1-derived strains and gastroenteritis was determined using logistic regression. The new assay exhibited 100% (95% CI 91.7%, 100%) diagnostic sensitivity and 99.4% (95% CI 96.2%, 100%) diagnostic specificity, with a detection limit of 9.86 copies/reaction and qPCR efficiency of 99.7%. Using this assay, we identified the presence of RV1-derived NSP2 sequences in 7.7% of rotavirus gastroenteritis cases and 98.6% of rotavirus-positive healthy children (94.4% had previously received the RV1). Among gastroenteritis cases, those whose stool contained RV1-derived strains had milder gastroenteritis symptoms compared to that of natural rotavirus infections. We observed no significant association between RV1-derived strains and gastroenteritis (odds ratio [OR] 0.98; 95% CI 0.60, 1.72). Our study demonstrated that the new assay is suitable for monitoring RV1-derived rotavirus strain circulation and that the RV1-derived strains are not associated with development of gastroenteritis symptoms.