Potentially fatal cardiac arrhythmias in the pediatric population represent a significant clinical challenge in emergency departments, especially due to their often nonspecific presentation and the rapid hemodynamic deterioration that can occur in children and adolescents. Although less prevalent than in adults, these conditions are associated with high morbidity and mortality, particularly when related to congenital heart disease, hereditary heart disease, and acute myocarditis (MAGALHÃES et al., 2016; HANASH; CROSSON, 2010). In this context, early recognition is essential to reduce adverse outcomes and episodes of sudden cardiac death in children.

The diagnostic approach to pediatric arrhythmic emergencies requires specific knowledge of pediatric cardiovascular physiology, since children cannot be considered “small adults” in the clinical and therapeutic management of these conditions (FRAZIER; HUNT; HOLMES, 2011). Recent studies demonstrate that supraventricular tachyarrhythmias, ventricular fibrillation, and severe bradycardias can present with variable clinical manifestations, including syncope, chest pain, palpitations, dizziness, and even sudden cardiorespiratory arrest (CLAUSEN et al., 2012; SEKAR, 2008). Thus, structured emergency assessment protocols are essential to ensure greater diagnostic accuracy.

Among the main causes associated with potentially fatal arrhythmias in pediatrics are hereditary syndromes, such as Brugada syndrome, arrhythmogenic cardiomyopathies, and complex structural heart abnormalities. Michowitz et al. (2019) emphasize that young patients with hereditary arrhythmic syndromes are at higher risk of serious cardiac events when not diagnosed early. Furthermore, Mariani et al. (2024) demonstrate that advances in diagnostic techniques and family screening have significantly contributed to the early identification of these diseases in contemporary pediatric practice.

Risk stratification in pediatric emergency departments also plays a significant role in the prognosis of these children, particularly in cases of syncope associated with suspected cardiovascular causes. Hurst et al. (2015) demonstrated that clinical data obtained during the medical history can aid in identifying patients at higher risk for severe heart disease. Concurrently, Paris et al. (2016) emphasize the importance of implementing standardized clinical algorithms to improve decision-making, reduce unnecessary tests, and optimize specialized referrals.

In recent years, there have been significant advances in international guidelines related to cardiopulmonary resuscitation and the management of pediatric cardiovascular emergencies. The American Heart Association’s recommendations emphasize the need for rapid protocols for recognizing hemodynamic instability, continuous monitoring, and early intervention in the face of malignant arrhythmias (CAO et al., 2025). In addition, the use of synchronized cardioversion, defibrillation, and specific antiarrhythmic medications has become more standardized in modern pediatric emergencies (RAO, 2020; GRANTHAM, 2007).

Another relevant aspect concerns the growing incorporation of diagnostic technologies in the emergency setting, including continuous electrocardiographic monitoring, Holter monitoring, echocardiography- , and advanced cardiovascular imaging methods. De Lange et al. (2025) highlight that the early use of emergency cardiovascular imaging can accelerate the differential diagnosis of severe arrhythmias in children. Similarly, Leng, Aldalati, and Homme (2025) demonstrate that ambulatory monitoring contributes to the identification of intermittent arrhythmic events that are often undetected during the initial evaluation.

In addition to primary cardiac causes, various systemic conditions can trigger potentially fatal arrhythmias in pediatric patients, including poisonings, fluid and electrolyte disturbances, inflammatory syndromes, and myocarditis. Soliman et al. (2026) describe the association between hyperkalemia and severe tachyarrhythmias in children with spontaneous tumor lysis syndrome, while Akbari et al. (2025) report cases of toxic myocarditis progressing to significant cardiac electrical instability. These findings reinforce the need for a multidisciplinary approach in pediatric emergency care.

Given the clinical relevance and prognostic impact of these conditions, it is essential to gather and critically analyze the available scientific evidence regarding the diagnosis and emergency management of potentially fatal arrhythmias in pediatrics. Thus, this systematic review aims to synthesize the main diagnostic, therapeutic, and risk stratification strategies currently described in the literature, contributing to clinical updates and the strengthening of evidence-based practices in the context of pediatric emergencies.

Hypotheses

Main hypothesis

The implementation of early diagnostic strategies and evidence-based emergency management protocols is associated with a reduction in morbidity and mortality related to potentially fatal arrhythmias in pediatric patients treated in emergency departments.

Secondary Hypotheses

1. Children and adolescents undergoing early cardiovascular assessment, including electrocardiographic monitoring and clinical risk stratification, are more likely to receive a rapid diagnosis and appropriate therapeutic intervention.
2. The standardization of emergency protocols for pediatric arrhythmias contributes to reducing response time and improving clinical outcomes in situations of hemodynamic instability.
3. Early recognition of clinical signs such as syncope, palpitations, chest pain, and electrocardiographic abnormalities increases the identification of heart conditions potentially associated with sudden death in pediatrics.
4. The use of emergency therapies based on updated guidelines, including synchronized cardioversion, defibrillation, and specific antiarrhythmic drugs, is associated with a higher rate of reversal of severe arrhythmias in pediatric patients.
5. The incorporation of complementary cardiovascular imaging methods and continuous monitoring improves the diagnostic accuracy of potentially fatal arrhythmias in the pediatric population.
6. Associated systemic conditions, such as fluid and electrolyte disturbances, poisonings, myocarditis, and inflammatory syndromes, have a significant impact on the occurrence and severity of cardiac arrhythmias in children and adolescents.
7. Continuous updating of multidisciplinary pediatric emergency teams promotes greater adherence to international guidelines and improves the quality of emergency cardiovascular care.

General Objective

To analyze, through a systematic review of the literature, the main scientific evidence related to the diagnosis, risk stratification, and emergency management of potentially fatal arrhythmias in the pediatric population, emphasizing evidence-based therapeutic approaches and their impact on clinical outcomes.

Specific Objectives

1. To identify the main potentially fatal arrhythmias described in children and adolescents in the context of pediatric emergencies.
2. To describe the most frequent clinical manifestations associated with pediatric arrhythmic emergencies, including syncope, palpitations, chest pain, hemodynamic instability, and cardiopulmonary arrest.
3. To evaluate the diagnostic methods used in the early recognition of severe arrhythmias in pediatrics, including electrocardiogram, continuous monitoring, Holter monitoring, and cardiovascular imaging studies.
4. Analyze the main risk factors associated with the occurrence of potentially fatal arrhythmias in pediatric patients, including congenital heart disease, inherited channelopathies, myocarditis, and metabolic disorders.
5. Investigate the emergency therapeutic strategies described in the literature for the management of severe pediatric arrhythmias, including cardioversion, defibrillation, and antiarrhythmic drug therapies.
6. To assess the importance of risk stratification and the implementation of standardized protocols in pediatric emergency care.
7. To evaluate the impact of international guidelines and evidence-based practices on clinical outcomes and prognosis in children with potentially fatal arrhythmias.
8. To synthesize current scientific evidence regarding the multidisciplinary approach to pediatric cardiovascular emergencies, contributing to clinical updates and the strengthening of care protocols.

Methodology

This study is a systematic review of the literature, conducted in accordance with the recommendations of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA 2020), with the aim of gathering and synthesizing scientific evidence related to the diagnosis and emergency management of potentially fatal arrhythmias in the pediatric population.

The search strategy was conducted in the PubMed/MEDLINE, Scopus, Web of Science, Embase, Virtual Health Library (VHL), and Cochrane Library databases, considering publications available between January 2010 and March 2026. Additionally, a manual search was performed in the references of the selected articles to expand the identification of potentially relevant studies.

Controlled descriptors were used, including Medical Subject Headings (MeSH) and Health Sciences Descriptors (DeCS), linked by the Boolean operators “AND” and “OR.” The search strategy included the following terms: “Pediatric Arrhythmias,” “Cardiac Emergencies,” “Sudden Cardiac Death,” “Emergency Management,” “Pediatric Emergency Medicine,” “Ventricular Tachycardia,” “Supraventricular Tachycardia,” “Bradyarrhythmia,” “Cardiopulmonary Resuscitation,” and “Children.”

The inclusion criteria encompassed original articles, systematic reviews, clinical guidelines, consensus statements, and observational studies published in English, Portuguese, or Spanish that addressed the diagnosis, risk stratification, emergency management, or prognosis of potentially fatal arrhythmias in children and adolescents. Studies involving pediatric patients aged 0 to 18 years treated in emergency departments, intensive care units, or specialized cardiology units were included.

Duplicate studies, incomplete works, reports without clinical relevance to the topic, articles without access to the full text, publications exclusively focused on the adult population, and studies with low methodological quality following critical analysis were excluded. Editorials, letters to the editor, and abstracts published without adequate methodological description were also excluded.

Study selection occurred in three stages: identification, screening, and eligibility. Initially, articles found in the databases were exported for bibliographic management and subjected to duplicate removal. Next, two independent reviewers read the titles and abstracts, selecting potentially eligible studies. Subsequently, the articles were analyzed in full to define the final sample. Disagreements between reviewers were resolved by consensus.

Data extraction included information regarding authors, year of publication, methodological design, study population, type of arrhythmia addressed, diagnostic methods used, emergency therapeutic strategies, main clinical outcomes, and study conclusions. The data were organized into summary tables to facilitate comparison of the scientific findings.

The methodological quality of the included studies was assessed using specific tools according to the methodological design of each study, considering risk of bias, consistency of results, clinical applicability, and scientific relevance. The results were analyzed descriptively and narratively, seeking to identify convergences, divergences, and gaps in the literature regarding pediatric arrhythmic emergencies.

The study selection flowchart was constructed according to the PRISMA 2020 model, detailing the stages of identification, screening, eligibility, and final inclusion of the analyzed articles

Results

The results obtained in this systematic review demonstrate growing scientific interest in potentially fatal arrhythmias in the pediatric population, especially in the context of emergency care and the prevention of sudden cardiac death. The analyzed literature highlighted significant advances in diagnostic and therapeutic strategies aimed at the early recognition of arrhythmic emergencies in children and adolescents. There was a predominance of studies addressing supraventricular tachyarrhythmias, ventricular fibrillation, inherited arrhythmic syndromes, and pediatric cardiopulmonary resuscitation protocols.

The included studies emphasized that the early identification of clinical signs, combined with electrocardiographic monitoring and cardiovascular risk stratification, has a direct impact on reducing serious complications and improving clinical prognosis. In addition, there was extensive discussion regarding the importance of implementing standardized protocols in pediatric emergency departments, promoting rapid interventions, greater hemodynamic stability, and a reduction in mortality associated with malignant arrhythmias.

Another important finding concerns the growing use of complementary technologies in the management of pediatric cardiovascular emergencies, including advanced cardiac imaging methods, continuous monitoring, and outpatient tests such as Holter monitoring and echocardiography. The analyzed articles also demonstrated a significant association between systemic diseases, metabolic disorders, intoxications, and the development of severe arrhythmias in pediatric patients, reinforcing the need for a multidisciplinary and integrated approach in the hospital setting.

The study selection process was conducted in accordance with the PRISMA 2020 guidelines, ensuring greater methodological transparency and scientific rigor during the identification, screening, eligibility, and inclusion stages of the articles. At the end of the process, 51 studies were selected to form the qualitative synthesis of this systematic review, as presented in the PRISMA flowchart.

Figure 1 – PRISMA flowchart of the selection of studies included in the systematic review

Table 1 compiles key studies for understanding the initial management of potentially fatal arrhythmias in pediatrics, with an emphasis on clinical identification, diagnostic classification, electrocardiographic evaluation, and emergency management. These studies were selected because they are directly related to the review’s objectives, particularly regarding the early recognition of severe arrhythmias, risk stratification, and the definition of therapeutic interventions in pediatric urgent and emergency settings.

Table 1 – Studies related to the clinical characterization, diagnosis, and emergency management of pediatric arrhythmias

Source: authors

The studies presented in Table 1 demonstrate that the management of potentially fatal arrhythmias in pediatrics depends on the integration of early clinical recognition, electrocardiographic evaluation, risk stratification, and immediate intervention. The included guidelines and reviews emphasize that symptoms such as syncope, palpitations, chest pain, hemodynamic instability, and cardiopulmonary arrest should be systematically evaluated, particularly in children with congenital heart disease, myocarditis, channelopathies, or suspected sudden cardiac death. Thus, this first set of studies supports the conceptual basis of the systematic review, serving as a starting point for the analysis of the other included articles.

Table 2 presents studies focused primarily on epidemiology, risk stratification, pediatric syncope, cardiac monitoring, and the identification of factors associated with potentially fatal arrhythmias in children and adolescents. These studies complement the findings in the previous table by emphasizing the importance of detailed clinical evaluation, diagnostic algorithms, and continuous monitoring as essential tools for reducing serious cardiovascular complications in the pediatric emergency setting.

Table 2 – Studies related to risk stratification, syncope, and cardiovascular monitoring in pediatrics

Source: authors

The studies included in Table 2 reinforce that cardiovascular risk stratification plays a central role in the early identification of pediatric patients at higher risk of developing potentially fatal arrhythmias. There was a predominance of studies focused on syncope, palpitations, and inherited channelopathies, highlighting the importance of a detailed medical history, continuous monitoring, and the implementation of standardized algorithms in emergency care. Furthermore, the articles demonstrate that multidisciplinary training and appropriate prehospital care can significantly contribute to reducing response time and improving prognosis in pediatric arrhythmic emergencies.

Table 3 compiles studies focused on advanced therapeutic strategies, cardiopulmonary resuscitation, metabolic disorders associated with arrhythmias, and special clinical conditions related to pediatric cardiovascular emergencies. The selected articles address contemporary emergency interventions, multidisciplinary management, and systemic factors capable of triggering cardiac electrical instability in children and adolescents, directly contributing to the objectives of this systematic review.

Table 3 – Studies related to advanced management, resuscitation, and systemic conditions associated with pediatric arrhythmias

Source: authors

The studies presented in Table 3 demonstrate that the management of potentially fatal arrhythmias in pediatrics goes beyond an exclusively cardiological approach, involving metabolic, toxic, inflammatory, and structural conditions capable of triggering significant cardiac electrical instability. Significant emphasis was placed on cardiopulmonary resuscitation guidelines, emergency protocols, and continuous monitoring methods, highlighting the need for rapid and multidisciplinary interventions. Furthermore, the articles emphasize that training of emergency teams, preventive cardiovascular screening, and standardization of clinical management are essential factors for reducing mortality associated with pediatric arrhythmic emergencies.

Table 4 presents an integrative summary of the main clinical outcomes, diagnostic methods, therapeutic strategies, and prognostic impacts observed in the studies included in this systematic review. This table was developed based on the specific research objectives, allowing for the correlation of the scientific evidence found with pediatric emergency clinical practice. The integrated analysis of the studies enables an understanding of the main factors associated with the early recognition of severe arrhythmias, as well as recent advances related to evidence-based pediatric cardiovascular management.

Table 4 – Summary of the main clinical and therapeutic findings related to potentially fatal arrhythmias in pediatrics

Source: authors