PERC-Peds Rule Could Change How Children Are Evaluated for Pulmonary Embolism: A PECARN Study

Pediatric emergency clinician evaluating a child at bedside, no imaging equipment in frame

Article reviewed: Ellison AM, Kuppermann N, Shihabuddin BS, et al. PERC-Peds rule for bedside exclusion of pulmonary embolism without radiation in children in the USA (BEEPER): a multicentre, prospective, observational, diagnostic accuracy study. Lancet Respir Med. Published online July 2026
DOI: 10.1016/S2213-2600(26)00086-X

Pulmonary embolism (PE) in children is uncommon, but delayed or missed diagnosis can have serious consequences. Despite this, there is relatively little evidence to guide clinician evaluation of suspected pediatric PE. There are no validated pediatric PE rule-out strategies and adult diagnostic pathways have not been prospectively tested in children.

PECARN sought to change that with their recently published study – BEEPER: Bedside Exclusion of Pulmonary Embolism without Radiation in Children [1]. The investigators developed a rule that safely excluded PE in low-risk children.

Study Objective

The goal of BEEPER was to prospectively evaluate whether the Pulmonary Embolism Rule-out Criteria adapted for children (PERC-Peds) could safely exclude pulmonary embolism in children without the need for laboratory testing or imaging.

What is PERC-Peds?

PERC-Peds was adapted from the adult Pulmonary Embolism Rule-out Criteria (PERC), a well-established adult clinical decision rule used to exclude PE in low-risk patients without additional testing [2]. Using retrospective pediatric data, investigators modified the adult PERC rule to create the pediatric version. A child was considered PERC-Peds negative only if ALL of the following were true:

  • Clinician gestalt pretest probability <15%
  • No prior PE or proximal DVT
  • No surgery requiring intubation within 30 days
  • No current estrogen use
  • No hemoptysis
  • Heart rate always:
    • <100 beats/min if older than 12 years
    • <120 beats/min if 12 years or younger
  • Oxygen saturation consistently >94%
  • No suspected DVT

Study Design

A Large, Prospective, Multicenter PECARN Study

BEEPER was a multicenter, prospective observational diagnostic accuracy study conducted across 21 emergency departments within PECARN (the Pediatric Emergency Care Applied Research Network).

Inclusion Criteria:

  • 4–17 years old, AND
  • had suspected PE or proximal DVT prompting clinicians to:
    • order diagnostic testing, OR
    • strongly consider PE in the differential diagnosis

Eligible diagnostic testing included:

  • D-dimer
  • CT pulmonary angiography (CTPA)
  • V/Q scan
  • MRI angiography
  • Other pulmonary vascular imaging

All testing decisions remained entirely at clinician discretion.

Outcome Definition

The outcome was venous thromboembolism (VTE), including:

  • image-confirmed pulmonary embolism, OR
  • proximal DVT (above knee or elbow)

Results

Enrollment

  • 4,039 children enrolled, 3,988 had analyzable data

Prevalence of Disease

Overall:

  • 254 children (6.3%) had PE and/or proximal DVT

Breakdown:

  • Isolated proximal DVT: 76
  • Both PE and proximal DVT: 56
  • Isolated PE: 122

Performance of PERC-Peds

The PERC-Peds rule demonstrated extremely high diagnostic sensitivity.

Diagnostic Accuracy

  • Sensitivity: 99.6% (95% CI 97.8–99.9%)
  • Specificity: 19.6% (95% CI 18.4–21.0%)
  • False negative rate: 0.1% (95% CI 0–0.75%)
  • Negative predictive value: 99.9%

There was only ONE false negative. These findings suggest that PERC-Peds can safely exclude PE in a subset of low-risk children without additional laboratory testing or imaging.

D-Dimer Findings

BEEPER also provided the first large prospective evaluation of D-dimer performance in children undergoing PE evaluation. Clinicians ordered D-dimer testing in approximately 75–79% of enrolled children. Using a standardized threshold of 500 ng/mL:

  • Sensitivity: 88.8%
  • Specificity: 61.9%
  • False negative rate: 1.2–1.4%

These data support the use of D-dimer as part of a sequential diagnostic strategy in pediatric PE evaluation for those children who fail PERC-Peds.

PERC-Peds + D-Dimer Sequential Strategy

One of the most clinically important findings was the potential value of combining:

  • PERC-Peds
  • followed by D-dimer if PERC-Peds failed

This sequential strategy would have:

  • safely excluded PE in 54.7% of enrolled children,
  • excluded PE in 69% of children who had D-dimer ordered,
  • maintained an acceptable false negative rate of 1.0% (95% CI 0.6–1.5%),
  • estimated reduction in CT pulmonary angiography use by approximately 18.5%.

Putting PERC-Peds in Context

The PERC-Peds rule performed well compared to the regularly utilized adult PERC rule. Adult PERC studies [2] typically show sensitivities around 95% with false negative rates below 2%, while in BEEPER, the sensitivity approached 100% with an exceptionally low false negative rate. Just as importantly, this is the first prospective study to support a bedside rule-out strategy for PE in children: offering a potential pathway to safely reduce unnecessary CT scans and radiation exposure in low-risk patients. BEEPER also lays the groundwork for a more standardized pediatric PE evaluation approach, where clinicians could use PERC-Peds first, followed by D-dimer testing when needed, reserving imaging for children at higher risk.

What’s Next?

While BEEPER represents a major step forward in pediatric PE diagnosis, the study also highlights important limitations and unanswered questions. PERC-Peds demonstrated high sensitivity, but relatively low specificity: meaning many children will still fail the rule, and indiscriminate use could potentially increase testing. Importantly, BEEPER was an observational diagnostic study, meaning it did not evaluate outcomes from the implementation of a clinical decision rule.

BEEPER provides the foundation for a new era of pediatric PE evaluation research. Future studies will likely focus on implementation science: understanding whether use of PERC-Peds changes clinician behavior, safely reduces imaging, and can be integrated into real-world emergency department workflows. Investigators also envision future diagnostic algorithms that combine PERC-Peds with D-dimer testing to reserve imaging for children at highest risk, potentially reducing unnecessary radiation exposure in a meaningful number of patients. Additional work can evaluate performance across different clinical settings, refine the gestalt component of the rule, and explore integration into electronic health record decision support tools. Taken together, BEEPER fills one of the most important evidence gaps in pediatric emergency medicine and represents the first major step toward safer, more standardized, and evidence-based pediatric PE evaluation.

References

  1. Ellison AM, Kuppermann N, Shihabuddin BS, et al. PERC-Peds rule for bedside exclusion of pulmonary embolism without radiation in children in the USA (BEEPER): a multicentre, prospective, observational, diagnostic accuracy study. Lancet Respir Med. Published online July 2026. doi:10.1016/S2213-2600(26)00086-X.
  2. Kline JA, Courtney DM, Kabrhel C, et al. Prospective multicenter evaluation of the pulmonary embolism rule-out criteria. J Thromb Haemost. 2008;6(5):772-780. doi:10.1111/j.1538-7836.2008.02944.x. PMID: 18318689.
By |2026-07-20T21:50:18-07:00Jul 21, 2026|Pediatrics, Pulmonary, Radiology|

What We Still Do Not Know About Pediatric Mental Health Emergencies: PECARN Research Agenda

Adolescent sitting on an emergency department bed seen from behind, with a caregiver and clinician nearby in a calm, dimly lit room

Article reviewed: Hoffmann JA, Foster AA, Krass P, et al. A research agenda for acute pediatric mental and behavioral health emergencies. Ann Emerg Med. Published online July 10, 2026
DOI: 10.1016/j.annemergmed.2026.05.015  |  PubMed: PMID 42429726

Every emergency physician knows these moments. A 10-year-old with autism is escalating in a hallway bed, and nobody can say which de-escalation approach or which medication is safest for him. A 15-year-old is boarding for a third night after a suicide attempt, receiving no active treatment while she waits for a psychiatric bed. A charge nurse asks whether universal suicide screening is worth the workflow disruption. These are routine clinical decisions, and for most of them the pediatric evidence simply does not exist.

A new consensus statement from the PECARN Mental Health Working Group, A Research Agenda for Acute Pediatric Mental and Behavioral Health Emergencies, published in Annals of Emergency Medicine, maps where those evidence gaps are and which ones matter most [1]. The panel reached consensus on 51 research priorities, 31 of them top tier. Read as a whole, the agenda is an unusually honest inventory of how much of current pediatric behavioral health emergency care runs on extrapolation and local habit.

Background

One in 6 US children has a mental or behavioral health condition, and nearly half receive no treatment from a mental health professional [2]. The ED has become the de facto safety net: visits for self-harm and harm to others have risen substantially over the past decade, boarding times have stretched, and in 2021 the American Academy of Pediatrics, the American Academy of Child and Adolescent Psychiatry, and the Children’s Hospital Association jointly declared a national emergency in child and adolescent mental health [3]. What has not kept pace is the evidence for what emergency clinicians should actually do during these visits.

How the Agenda Was Built

The working group used a modified Delphi process with 23 expert partners: 4 parents and 1 young adult with lived experience of pediatric mental health emergency care, general and pediatric emergency physicians, emergency nurses, child and adolescent psychiatrists with emergency expertise, ED social workers, out-of-hospital and EMS-fellowship-trained clinicians, and a research funder. Across 3 survey rounds, 76 literature-informed candidate priorities were modified, expanded, and rated on need and urgency, research impact, and family centeredness. The prespecified retention criteria required agreement from both the family representative group and the clinician and funder group, so family voices could not be outvoted. The result: 51 consensus priorities sorted into 3 tiers.

Where the Gaps Are

Suicide prevention dominates

Suicide prevention questions account for 42% of the top tier. The panel wants to know which suicide risk screening tool best predicts real outcomes such as return visits, attempts, and deaths, including in neurodivergent children and non-English speakers; what universal screening does to those outcomes; and whether safety planning, with or without structured follow-up calls, actually increases mental health follow-up and reduces future attempts in youth. The contrast with adult evidence is striking. In adults, the multicenter ED-SAFE trial showed that universal screening plus a brief intervention reduced post-discharge suicidal behavior [4]. The pediatric equivalent has never been done. The panel also prioritized a practical lethal-means question: which safety devices, from medication lock boxes to firearm safes, do caregivers actually prefer and use after the ED visit?

Agitation: everything is still an open question

Which de-escalation methods best reduce medication use, restraint use, and staff injuries, and how does that differ by age, developmental stage, culture, language, and trauma history? Which medications are safest and most effective, for which children? What works for children with neurodevelopmental disorders such as autism spectrum disorder, who face a higher risk of pharmacologic and physical restraint? None of these have comparative evidence today, even though documented racial disparities in restraint application make the stakes plain [1].

Boarding and ED care

Top-tier questions include whether brief therapy delivered in the ED during boarding improves symptoms, shortens length of stay, and lowers admission rates, and whether home-based care is a safe and acceptable alternative to hospitalization. The panel also flagged care in rural and low-resource EDs, where most of these children are actually seen.

Before and after the ED

Out-of-hospital priorities center on training first responders in de-escalation and trauma-informed care and on testing novel response models, including mental health co-response teams and alternative destinations. A single-county pilot of direct EMS transport to a psychiatric emergency facility found that roughly 2 in 5 encounters met criteria for direct transport, with only 0.5% requiring secondary ED transfer within 24 hours [5]. On the back end, the agenda targets the high-risk post-discharge window: what actually gets youth to mental health care after they leave, and whether stepped-care models using telehealth reduce return visits and future attempts.

Clinical Implications

Nothing in a research agenda changes tomorrow’s orders, and this post will not pretend otherwise. The value for a practicing clinician is different. First, the agenda names how thin the floor is under common practices: medication choice for acute agitation in children, for example, is largely extrapolated from adult psychiatry. Knowing where evidence is absent should make us slower to treat local protocol as settled science. Second, this document signals where PECARN and federal funders will direct pediatric emergency mental health research over the next 5 to 10 years, which is useful for anyone building a QI program, a research career, or a departmental protocol they would prefer not to rewrite twice. Third, the top-tier questions double as an audit checklist: if your ED cannot say how often it restrains children, whether safety planning happens before discharge, or what its mental health boarding times are, the agenda is a reasonable place to start measuring.

One limitation deserves mention because the authors themselves flag it: no expert partners identified as Black or Hispanic, a notable gap given the documented racial disparities in restraint use and in behavioral health triage that PECARN’s own work has described.

Bottom Line

PECARN’s consensus research agenda distills the pediatric mental and behavioral health emergency evidence gap into 51 prioritized questions, with suicide prevention accounting for 42% of the top tier. It will not change your practice today. It tells you something more uncomfortable and more useful: for most of what we do during pediatric behavioral health visits, from de-escalation to safety planning to boarding care, the evidence base has not been written yet, and this is the field’s official to-do list for writing it.

References

  1. Hoffmann JA, Foster AA, Krass P, et al. A research agenda for acute pediatric mental and behavioral health emergencies. Ann Emerg Med. Published online July 10, 2026. PMID: 42429726. doi:10.1016/j.annemergmed.2026.05.015
  2. Bitsko RH, Claussen AH, Lichstein J, et al. Mental health surveillance among children – United States, 2013-2019. MMWR Suppl. 2022;71(2):1-42. PMID: 35202359. doi:10.15585/mmwr.su7102a1
  3. American Academy of Pediatrics, American Academy of Child and Adolescent Psychiatry, Children’s Hospital Association. AAP-AACAP-CHA declaration of a national emergency in child and adolescent mental health. 2021.
  4. Miller IW, Camargo CA Jr, Arias SA, et al. Suicide prevention in an emergency department population: the ED-SAFE study. JAMA Psychiatry. 2017;74(6):563-570. PMID: 28456130. doi:10.1001/jamapsychiatry.2017.0678
  5. Glomb NW, Trivedi T, Grupp-Phelan J, et al. Safety of a prehospital emergency medical services protocol for an alternative destination for pediatric behavioral emergencies in Alameda County. J Am Coll Emerg Physicians Open. 2023;4(2):e12930. PMID: 37051504. doi:10.1002/emp2.12930
By |2026-07-13T03:11:42-07:00Jul 13, 2026|Pediatrics, Psychiatry|

AZ-SWED Trial: Azithromycin Does Not Improve Preschool Wheezing Outcomes

Pediatric emergency clinician listening to a wheezing toddler's chest with a stethoscope while the child sits on a parent's lap

Article reviewed: Denninghoff KR, Casper TC, Zorc JJ, et al. Azithromycin for Preschoolers with Wheezing in the Emergency Department. N Engl J Med. Published online May 18, 2026
DOI: 10.1056/NEJMoa2516505  |  PubMed: PMID 42149992

Preschool wheezing is one of the most common pediatric ED presentations, and reaching for azithromycin can be tempting. Rhinovirus is the virus most often detected in these episodes, but pathogenic bacteria are commonly found in the nasopharynx of affected children, and some earlier outpatient data suggested that early antibiotic therapy might blunt severity.

The AZ-SWED trial (Azithromycin Therapy in Preschoolers with a Severe Wheezing Episode Diagnosed at the Emergency Department), published in the New England Journal of Medicine, tested this directly in the ED. The trial was stopped early for futility [1].

Study Design

Denninghoff et al enrolled 840 children aged 18-59 months presenting with moderate-to-severe wheezing across eight PECARN emergency departments. The age range was chosen to target preschool-aged children before a clear asthma diagnosis is typically established, the population in whom antibiotic benefit has been most often hypothesized and in whom practice variation is greatest. Children were randomized to either a 5-day course of azithromycin or a matching placebo, with all participants also receiving standard care at the treating clinician’s discretion, including bronchodilators and corticosteroids.

Because prior research raised the possibility that bacterial co-colonization might identify a subgroup most likely to benefit from antibiotics [2-5], the trial pre-specified separate analyses for children with and without detectable nasopharyngeal Streptococcus pneumoniae, Moraxella catarrhalis, or Haemophilus influenzae, the three organisms most commonly implicated in respiratory illness in this age group. This let the investigators test whether the bacteria-positive children benefit, rather than leaving it as a post hoc question.

The primary outcome was symptom severity over 5 days, measured using the Asthma Flare-up Diary for Young Children (ADYC), a validated 17-item caregiver-reported instrument in which each symptom is scored from 1 (best) to 7 (worst) [6]. Secondary outcomes included ED and hospital length of stay and return ED visits or hospitalizations within 72 hours [1].

Results

Azithromycin provided no clinical benefit over placebo, regardless of bacterial detection status.

ADYC symptom scores over 5 days were similar between groups in children with detectable nasopharyngeal bacteria (p = 0.70) and in those without (p = 0.69). There were no meaningful differences in length of stay or in return visits or hospitalizations.

Rhinovirus was the most commonly detected virus, identified in 72.5% of participants. Pathogenic bacteria were detected on nasopharyngeal swab in 62% of children overall. Azithromycin did clear nasopharyngeal bacteria more effectively than placebo (58.7% vs 11.4%), confirming that the drug was biologically active. That microbiologic effect, however, did not translate to clinical improvement on any outcome measured.

Clinical Implications

This is a large, ED-based randomized trial, and it argues against routine antibiotic use in preschool wheezing. Up to a quarter of children hospitalized for wheezing currently receive antibiotics, which likely reflects the same uncertainty the trial set out to address. The bacteria detected in the nasopharynx do not appear to drive the acute wheezing episode in these children, and treating them does not change how the children do.

The dissociation between bacterial clearance and clinical outcomes is itself informative. The fact that azithromycin reliably eradicated nasopharyngeal bacteria without any detectable clinical signal suggests that these organisms are bystanders rather than drivers of the acute episode, at least in most preschool wheezers. This has implications beyond this trial: it cautions against using bacterial detection alone as a rationale for antibiotic prescribing in this age group.

Bottom Line

Routine azithromycin has no role in the management of preschool wheezing, even in children with detectable nasopharyngeal bacteria. Bronchodilators and corticosteroids where appropriate remain the mainstays of care, and these data give clinicians another reason to hold antibiotics in this group.

References

  1. Denninghoff KR, Casper TC, Zorc JJ, et al. Azithromycin for Preschoolers with Wheezing in the Emergency Department. N Engl J Med. Published online May 18, 2026. PMID: 42149992. doi:10.1056/NEJMoa2516505
  2. Bisgaard H, Hermansen MN, Buchvald F, et al. Childhood asthma after bacterial colonization of the airway in neonates. N Engl J Med. 2007;357(15):1487-1495. PMID: 17928596. doi:10.1056/NEJMoa052632
  3. Bacharier LB, Guilbert TW, Mauger DT, et al. Early Administration of Azithromycin and Prevention of Severe Lower Respiratory Tract Illnesses in Preschool Children With a History of Such Illnesses: A Randomized Clinical Trial. JAMA. 2015;314(19):2034-2044. PMID: 26575060. doi:10.1001/jama.2015.13896
  4. Stokholm J, Chawes BL, Vissing NH, et al. Azithromycin for episodes with asthma-like symptoms in young children aged 1-3 years: a randomised, double-blind, placebo-controlled trial. Lancet Respir Med. 2016;4(1):19-26. PMID: 26704020. doi:10.1016/S2213-2600(15)00500-7
  5. Mandhane PJ, Paredes Zambrano de Silbernagel P, Aung YN, et al. Treatment of preschool children presenting to the emergency department with wheeze with azithromycin: a placebo-controlled randomized trial. PLoS One. 2017;12(8):e0182411. PMID: 28771627. doi:10.1371/journal.pone.0182411
  6. Ducharme FM, Jensen ME, Mendelson MJ, et al. Asthma Flare-up Diary for Young Children to monitor the severity of exacerbations. J Allergy Clin Immunol. 2016;137(3):744-749.e6. PMID: 26341275. doi:10.1016/j.jaci.2015.07.028
By |2026-06-02T21:43:22-07:00Jun 4, 2026|Infectious Disease, Pediatrics, Pulmonary|
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