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Cardiopulmonary arrest in children occurs less frequently than in adults and most often arises from noncardiac causes, particularly progressive respiratory failure or shock, rather than primary coronary disease. Common predisposing conditions include congenital heart disease, severe pulmonary disorders, sepsis, trauma, and underlying neurologic impairment. Pathophysiologic progression typically involves hypoxemia, hypercapnia, metabolic acidosis, and hypotension, leading to bradycardia, myocardial depression, and circulatory collapse. Early clinical manifestations include altered mental status, abnormal respiratory patterns, tachycardia or bradycardia, and signs of poor perfusion. Diagnosis is clinical and requires immediate recognition of apnea, agonal respirations, or pulselessness, followed by rapid assessment of rhythm and evaluation of oxygenation. Prompt identification of deterioration is critical to prevent progression to cardiac arrest and irreversible organ injury. This course advances clinicians' competence in recognizing and managing pediatric cardiopulmonary arrest across the prearrest, arrest, and postarrest phases of care. Participants refine skills in early identification of respiratory failure and shock; deliver high-quality cardiopulmonary resuscitation with age-appropriate compression depth and rate; minimize interruptions; and provide effective ventilation. Content emphasizes timely defibrillation when indicated and adherence to Basic Life Support and Pediatric Advanced Life Support algorithms. Post–return of spontaneous circulation management is reviewed, including hemodynamic optimization, respiratory support, temperature management, and prevention of secondary hypoxic-ischemic injury. Collaboration with an interprofessional healthcare team—integrating nursing, respiratory therapy, pharmacy, and critical care services—enhances coordination, reduces delays, and improves neurologic and survival outcomes for children in acute cardiopulmonary distress. Objectives: Identify reversible causes of pediatric cardiopulmonary arrest using systematic assessment frameworks such as hypoxia, hypovolemia, and electrolyte disturbances. Interpret cardiac rhythm monitoring, capnography, oxygen saturation, and hemodynamic data during resuscitation and postarrest care.

This course advances clinicians' competence in recognizing and managing pediatric cardiopulmonary arrest across the prearrest, arrest, and postarrest phases of care. Participants refine skills in early identification of respiratory failure and shock; deliver high-quality cardiopulmonary resuscitation with age-appropriate compression depth and rate; minimize interruptions; and provide effective ventilation. Content emphasizes timely defibrillation when indicated and adherence to Basic Life Support and Pediatric Advanced Life Support algorithms. Post–return of spontaneous circulation management is reviewed, including hemodynamic optimization, respiratory support, temperature management, and prevention of secondary hypoxic-ischemic injury. Collaboration with an interprofessional healthcare team—integrating nursing, respiratory therapy, pharmacy, and critical care services—enhances coordination, reduces delays, and improves neurologic and survival outcomes for children in acute cardiopulmonary distress. Objectives: Identify reversible causes of pediatric cardiopulmonary arrest using systematic assessment frameworks such as hypoxia, hypovolemia, and electrolyte disturbances. Interpret cardiac rhythm monitoring, capnography, oxygen saturation, and hemodynamic data during resuscitation and postarrest care. Implement individualized, evidence-based approaches for managing pediatric cardiopulmonary arrest and mitigating potential complications. Apply effective strategies to improve care coordination among interprofessional team members to facilitate positive outcomes for pediatric patients in cardiopulmonary arrest. Access free multiple choice questions on this topic.

Cardiopulmonary arrest in children is defined as the cessation of effective cardiac and respiratory function, resulting in inadequate oxygen delivery to the brain and other vital organs. Clinical indicators include the absence of a palpable central pulse, unresponsiveness, and apnea. Although uncommon in pediatric populations, cardiopulmonary arrest most frequently arises from respiratory failure or shock rather than primary cardiac disease. Early initiation of high-quality cardiopulmonary resuscitation (CPR) markedly improves survival and neurologic outcomes. The American Heart Association (AHA) periodically updates pediatric basic and advanced life support guidelines. Pediatric resuscitation principles are taught through the Pediatric Advanced Life Support (PALS) course.[1][2]

The etiologies of pediatric cardiopulmonary arrest are diverse and vary by age group and clinical context. Common causes include the following: Respiratory failure: airway obstruction, pneumonia, bronchiolitis, asthma, aspiration, drowning, suffocation, strangulation Shock states: septic, hypovolemic, cardiogenic, obstructive, hemorrhagic, anaphylactic Arrhythmias: channelopathies, myocarditis Trauma: blunt or penetrating injuries, traumatic brain injury Toxicologic etiologies: accidental medication overdose, illicit substances, environmental toxins, household chemical exposure Unexplained: sudden infant death syndrome, sudden unexpected infant death When identifying the underlying cause of pediatric cardiopulmonary arrest, the AHA recommends consideration of reversible conditions. Recognizing these conditions, commonly summarized as the "Hs and Ts," enables targeted interventions during resuscitation.[3] The Hs include the following: Hypovolemia: Loss of circulatory volume can precipitate hypovolemic shock, leading to cardiac arrest. Common etiologies include acute blood loss (hemorrhagic shock) and severe dehydration. Rapid recognition and volume resuscitation are critical. Hypoxia: Oxygen deprivation from respiratory failure contributes to cardiac arrest. Assessment should include airway patency, chest rise, breath sounds, and oxygen delivery. Supplemental oxygen and advanced airway management are essential. Hydrogen ions (acidosis): Respiratory or metabolic acidosis, as seen in upper airway obstruction or diabetic ketoacidosis, may precipitate arrest. Acid-base status should be evaluated using arterial blood gas analysis. Correction requires adequate ventilation and treatment of underlying metabolic derangements. Hypokalemia or hyperkalemia: Potassium imbalances can trigger cardiac arrest. Etiologies include gastrointestinal or renal disorders. Electrocardiographic findings of hyperkalemia include peaked T waves, QRS widening, and sine wave patterns. Hypokalemia is characterized by flattened T waves, prominent U waves, and possible QRS widening. Prompt electrolyte correction is necessary. Hypoglycemia: Rapid assessment of blood glucose via point-of-care testing is essential. Intravenous or intraosseous dextrose should be administered promptly in patients with impaired consciousness.

Hypokalemia or hyperkalemia: Potassium imbalances can trigger cardiac arrest. Etiologies include gastrointestinal or renal disorders. Electrocardiographic findings of hyperkalemia include peaked T waves, QRS widening, and sine wave patterns. Hypokalemia is characterized by flattened T waves, prominent U waves, and possible QRS widening. Prompt electrolyte correction is necessary. Hypoglycemia: Rapid assessment of blood glucose via point-of-care testing is essential. Intravenous or intraosseous dextrose should be administered promptly in patients with impaired consciousness. Hypothermia: Severe hypothermia may cause arrest unresponsive to medications or defibrillation. Management includes rapid rewarming and early consideration of extracorporeal membrane oxygenation when indicated. The Ts include the following: Tension pneumothorax: Accumulation of air in the pleural space increases intrapleural pressure, causing cardiopulmonary collapse. In children, tension pneumothorax most commonly results from trauma or aggressive mechanical ventilation. Clinical signs include tachycardia, jugular venous distension, unequal breath sounds, and tracheal deviation. Definitive treatment requires needle decompression followed by chest tube placement. Tamponade, cardiac: Fluid accumulation within the pericardium impairs cardiac filling, potentially leading to cardiac arrest. Typical findings include sinus tachycardia, hypotension with narrow pulse pressure, and muffled heart sounds. History may reveal trauma, recent cardiac surgery, or pericardial disease. Definitive treatment is pericardiocentesis. Toxins: Poisoning from medications or illicit drugs can precipitate cardiac arrest. Common agents include tricyclic antidepressants, calcium channel blockers, β-blockers, digoxin, and street drugs such as opiates and cocaine. Consultation with poison control services is recommended during management. Thrombosis, pulmonary: Acute obstruction of one or both pulmonary arteries causes rapid cardiopulmonary collapse. This condition is rare in children but may occur in adolescents with clotting disorders. Clinical features include chest pain, tachycardia, and respiratory distress. Right heart strain is evident on echocardiography. Definitive management includes fibrinolytic therapy and, when indicated, pulmonary thrombectomy.

Thrombosis, pulmonary: Acute obstruction of one or both pulmonary arteries causes rapid cardiopulmonary collapse. This condition is rare in children but may occur in adolescents with clotting disorders. Clinical features include chest pain, tachycardia, and respiratory distress. Right heart strain is evident on echocardiography. Definitive management includes fibrinolytic therapy and, when indicated, pulmonary thrombectomy. Thrombosis, coronary: Occlusion of 1 or more coronary arteries can result in myocardial infarction and cardiac arrest. Although rare in children, this condition may occur in the context of congenital cardiac disorders, inherited thrombophilias, or Kawasaki disease. Treatment includes fibrinolytic therapy or percutaneous coronary intervention. Understanding the spectrum of etiologies of pediatric cardiopulmonary arrest enables clinicians to promptly address reversible factors. Familiarity with the Hs and Ts supports timely, targeted interventions to optimize outcomes.

As of 2015, the AHA estimates that over 20,000 children in the United States experience cardiopulmonary arrest annually, with a higher incidence of in-hospital cardiac arrest (IHCA) compared to out-of-hospital cardiac arrest (OHCA). More than 70% of cases occur in children younger than 1 year, followed by adolescents and older children, with a slightly higher proportion in boys. Infant survival rates are more than 6% lower than those for older children and adolescents. Survival and neurologic outcomes vary significantly, depending on the location of arrest. IHCA and OHCA represent distinct clinical entities that require tailored approaches. IHCA occurs in approximately 2% to 6% of children admitted to pediatric intensive care units, predominantly in patients with preexisting comorbidities such as pulmonary, cardiac, oncologic, and gastrointestinal conditions. The majority of presenting rhythms are asystole and pulseless electrical activity (PEA), whereas ventricular fibrillation and pulseless ventricular tachycardia are less frequent. Survival to hospital discharge following IHCA is approximately twice that observed in OHCA, likely reflecting the benefit of immediate hospital-initiated CPR.[4] By comparison, OHCA affects between 7.5 and 11.2 children per 100,000 annually, with infants constituting the majority and experiencing the lowest survival rates. Outcomes depend on whether the arrest was witnessed, early bystander CPR was provided, and return of spontaneous circulation was achieved prior to hospital transport. More than 80% of OHCA cases present with asystole or PEA, whereas ventricular fibrillation accounts for approximately 10%.[5] The AHA estimates that over 20,000 children experience cardiopulmonary arrest annually in the US, with IHCA occurring more frequently than OHCA. Outcomes for unwitnessed cardiopulmonary arrest in infants and children remain poor. Only 8.4% of pediatric patients with OHCA survive to hospital discharge, many with neurologic impairments. In-hospital survival is approximately 46%, with improved neurologic outcomes. The best-reported outcomes occur in children receiving immediate high-quality CPR with adequate ventilation and coronary perfusion, as well as those with witnessed sudden arrest presenting with ventricular rhythm disturbances responsive to early defibrillation.

The AHA estimates that over 20,000 children experience cardiopulmonary arrest annually in the US, with IHCA occurring more frequently than OHCA. Outcomes for unwitnessed cardiopulmonary arrest in infants and children remain poor. Only 8.4% of pediatric patients with OHCA survive to hospital discharge, many with neurologic impairments. In-hospital survival is approximately 46%, with improved neurologic outcomes. The best-reported outcomes occur in children receiving immediate high-quality CPR with adequate ventilation and coronary perfusion, as well as those with witnessed sudden arrest presenting with ventricular rhythm disturbances responsive to early defibrillation. A retrospective cohort study analyzed data from the Nationwide Emergency Department Sample, encompassing emergency department (EDCA) and inpatient (IPCA) cardiac arrest events from 2016 to 2018. During this period, 15,348 pediatric cardiac arrest events were recorded, including 13,239 EDCA and 2109 IPCA cases. Causes of arrest varied. Respiratory etiologies predominated, accounting for 75.8%. Other contributing factors included acidosis (43.9%), acute kidney injury (27.2%), trauma (27.1%), and sepsis (22.5%). Several cases lacked a definitive associated diagnosis. Survival rates differed significantly, with 19% for EDCA and 40.4% for IPCA. This study highlights the survival gap between pediatric patients experiencing arrest in inpatient versus emergency department or out-of-hospital settings. Among cardiovascular deaths in athletes younger than 18, 29% were Black, and 54% were high school students. Additionally, 82% of cases occurred during physical exertion during competition or training. These findings identify specific populations and circumstances that may benefit from focused cardiovascular risk assessment and intervention. Pediatric arrest rhythms are classified as asystole, PEA, ventricular fibrillation, and pulseless ventricular tachycardia.[6][7] Each rhythm carries distinct hemodynamic implications and requires tailored management strategies.

During cardiopulmonary arrest, global ischemia produces cellular-level organ damage that may continue after resuscitation. Ischemia induces cellular edema, which affects all organs but is particularly detrimental to the brain. Limited cranial compliance increases intracranial pressure and reduces cerebral perfusion, resulting in poor neurologic outcomes. Cardiac arrest progresses through 4 phases: prearrest, no-flow, low-flow, and postresuscitation. The duration and management of each phase significantly influence neurological recovery. The prearrest phase encompasses events preceding arrest, including underlying pathologies such as acute illness and comorbidities, as well as environmental factors such as trauma. Early recognition during this phase permits timely intervention to prevent arrest. Environmental factors exert a greater impact on OHCA; caregiver education on infant safe sleep practices and swimming safety reduces pediatric mortality. In contrast, IHCA outcomes improve with early provider recognition and management of prearrest conditions, including hypoxia, hypotension, tachycardia, and acidosis. The no-flow phase is the interval from the onset of cardiac arrest to recognition by a bystander or healthcare professional. Circulation and cerebral perfusion cease entirely during this period. OHCA is generally associated with longer no-flow intervals, which contribute to poorer outcomes. Following recognition, the low-flow phase begins with initiation of CPR and continues until return of spontaneous circulation (ROSC) is achieved. High-quality chest compressions restore partial blood flow. However, cerebral perfusion remains approximately 20% of baseline and declines further with prolonged no-flow intervals.[8] This phase also includes identifying and treating the arrest rhythm in accordance with PALS guidelines. The postarrest phase begins once ROSC occurs, during which children may develop varying degrees of postarrest syndrome. Clinical management focuses on neuroprotection and treatment of the underlying cause of arrest. This phase encompasses the immediate postarrest (first 20 minutes after ROSC), early postarrest (20 minutes to 6–12 hours), intermediate (6–12 to 72 hours), and recovery (beginning 3 days after ROSC) periods.

The history and physical examination of a child in cardiopulmonary arrest differ between OHCA and IHCA. In OHCA, signs of impending arrest may include loss of consciousness, abnormal respiratory patterns, cyanosis, agitation, and seizure-like activity. Initial assessment should follow the ABCDE framework: airway, breathing, circulation, disability, and exposure. While evaluating these domains, history should be obtained from a parent or guardian, emphasizing events preceding the arrest and underlying conditions such as congenital heart disease, prematurity, epilepsy, or recent illness. Environmental factors require careful consideration, including electrocution, extreme weather, and potential chemical exposures, which may compromise child and rescuer safety. A bystander should be tasked immediately with contacting emergency medical services. In IHCA, the ABCDE framework remains central to the initial evaluation. History should be obtained from parents, the primary nurse, and clinical documentation, detailing the reason for admission, pertinent laboratory data, and recent clinical deterioration. Signs of impending cardiac arrest in hospitalized children commonly include bradycardia, hypoxia, respiratory distress, agitation, confusion, somnolence, and skin changes such as pallor and cyanosis. ABCDE Rapid Assessment The ABCDE rapid assessment begins with airway evaluation. Patency should be verified, and foreign body aspiration should be considered if arrest occurred during eating or a small object was present in the child’s mouth. In intubated patients, the DOPE (displacement of the endotracheal tube, obstruction of the endotracheal tube, pneumothorax, and equipment failure) mnemonic—dislodgement, obstruction, pneumothorax, equipment failure—guides troubleshooting. Breathing should be evaluated by observing spontaneous respirations, assessing respiratory effort, measuring respiratory rate, and auscultating for bilateral breath sounds. Circulation should be examined by palpating a central pulse, measuring capillary refill, identifying active bleeding, and, when available, recording blood pressure. Disability assessment includes evaluation of consciousness, pupillary response, and reactivity to verbal or tactile stimuli. Full-body inspection should identify signs of illness such as trauma, rash, or cyanosis, while maintaining thermoregulation.

The evaluation of a child in cardiopulmonary arrest differs between OHCA and IHCA settings. In OHCA without an automated external defibrillator (AED), nonwitnessed cardiac arrest warrants brief CPR before calling for help and retrieving an AED. In the event of sudden collapse, the rescuer should summon assistance and apply an AED prior to initiating CPR. A single rescuer uses a 30:2 compression–to–ventilation ratio across all pediatric age groups, whereas 2-person CPR employs a 15:2 ratio for infants and children and a 3:1 ratio for neonates. For infants, the 2-thumb-encircling technique is preferred for 2-person CPR, while the 2-finger technique is recommended for a lone rescuer.[9] For children, both 1- and 2-handed techniques are acceptable. Compressions should target the lower 3rd of the sternum at a depth of 1/3 the anterior–posterior chest diameter. In OHCA with an AED, CPR should begin immediately, and defibrillation pads should be applied. For children aged 8 years and older, pads are placed as in adults (on the right upper chest and left lower chest). Anterior–posterior placement is recommended when children younger than 8 years are involved, or the pads overlap on the patient's chest. The AED analyzes the rhythm and directs shock delivery or continuation of CPR. High-quality CPR should continue as instructed until EMS arrival. In IHCA, with a code blue team present, rapid physical examination and the ABCDE assessment should be initiated. CPR should be initiated, the defibrillator attached, and the cardiac rhythm assessed immediately.

Regardless of etiology, early CPR combined with cardiac rhythm monitoring guides the appropriate pulseless arrest pathway. For pediatric individuals in cardiac arrest, the recommended compression-to-ventilation ratio is 30:2 for a single clinician and 15:2 for 2 clinicians. Management of asystole and PEA includes administering epinephrine at 0.01 mg/kg every 3 to 5 minutes in a 1:10,000 solution. Although intravenous administration is preferred, epinephrine may also be delivered via the intraosseous or endotracheal route. The endotracheal dose is 0.1 mg/kg, which is 10 times higher. PEA typically results from an identifiable underlying cause, categorized in PALS using the mnemonic “Hs and Ts.”[10][11][12] Ventricular fibrillation and pulseless ventricular tachycardia share core management principles, including early initiation of high-quality CPR and rapid identification of the rhythm. Early access to a manual defibrillator (AED) significantly improves survival rates. The recommended defibrillation energy in pediatric patients is 2 J/kg. The introduction of biphasic defibrillators led to the removal of the 3-stacked-shock approach from current guidelines. Detailed management steps are outlined in the algorithms below.[13][14] When OHCA is anticipated, preparation should occur before patient arrival. A code team must be activated, a resuscitation room prepared, and age-appropriate equipment readied. Team members should be assigned specific roles, including the following: Team leader Airway provider Chest compressor Vascular access provider (intravenous or intraosseous) Medication administrator History taker (from family and emergency medical services) Family liaison Recorder/timekeeper Security officer (for crowd control, if available) Initial treatment of cardiopulmonary arrest involves delivering high-quality chest compressions at 100 to 120 compressions per minute, with a depth of approximately one-third of the chest diameter, and maintaining interruptions of less than 10 seconds. Advanced airway management includes rescue breaths at 1 breath every 2 to 3 seconds and placement of an advanced airway. Early defibrillation must be administered for shockable rhythms, beginning at 2 J/kg for the firstshock, increasing to 4 J/kg for the second shock, and thereafter exceeding 4 J/kg, with a maximum of 10 J/kg. Epinephrine should be administered every 3 to 5 minutes.

Initial treatment of cardiopulmonary arrest involves delivering high-quality chest compressions at 100 to 120 compressions per minute, with a depth of approximately one-third of the chest diameter, and maintaining interruptions of less than 10 seconds. Advanced airway management includes rescue breaths at 1 breath every 2 to 3 seconds and placement of an advanced airway. Early defibrillation must be administered for shockable rhythms, beginning at 2 J/kg for the firstshock, increasing to 4 J/kg for the second shock, and thereafter exceeding 4 J/kg, with a maximum of 10 J/kg. Epinephrine should be administered every 3 to 5 minutes. Reversible and underlying causes of cardiopulmonary arrest must be considered, along with the potential use of extracorporeal circulation with extracorporeal membrane oxygenation. In cases of IHCA, rapid assessment and recognition of the arrest state are required, followed by immediate initiation of CPR and activation of the code blue team. Management should follow PALS guidelines once the cardiac rhythm is identified. The presenting cardiac rhythm during arrest is determined using a cardiac monitor or defibrillator. Asystole indicates the absence of cardiac activity. PEA demonstrates electrical activity without a detectable pulse. Ventricular tachycardia manifests as monomorphic wide-complex tachycardia. Ventricular fibrillation appears as polymorphic fibrillatory waves. Torsades de Pointes is characterized by polymorphic wide-complex tachycardia with a heart rate exceeding 300 bpm. For additional details on arrhythmia identification during arrest, refer to the StatPearls learning activity on arrhythmias.[15] The Broselow system, a length-based resuscitation tape and code cart, assists in determining appropriate medication doses and equipment sizes. However, system accuracy is limited, as several studies' results have demonstrated suboptimal precision, necessitating consideration of body habitus in addition to age and length. A 2017 meta-analysis found that the Broselow tape accurately estimated weight within 10% in slightly more than 50% of cases. Inaccurate weight estimation may result in critical medication dosing errors and increased risk of patient harm.

The Broselow system, a length-based resuscitation tape and code cart, assists in determining appropriate medication doses and equipment sizes. However, system accuracy is limited, as several studies' results have demonstrated suboptimal precision, necessitating consideration of body habitus in addition to age and length. A 2017 meta-analysis found that the Broselow tape accurately estimated weight within 10% in slightly more than 50% of cases. Inaccurate weight estimation may result in critical medication dosing errors and increased risk of patient harm. Airway management during pediatric resuscitation prioritizes establishing a definitive airway via endotracheal intubation, which remains the gold standard. For OHCA with short transport times, bag-valve-mask ventilation is preferred until hospital arrival for definitive airway placement. Paramedics should place a supraglottic airway or endotracheal tube when transport times are prolonged. Endotracheal intubation is standard in IHCA. Cuffed endotracheal tubes are recommended for all children except neonates. Tube size should be estimated using the formula [(age/4) + 3.5] for cuffed tubes and [(age/4) + 4] for uncuffed tubes, with tube depth set at 3 times the tube size. The Broselow tape may assist with sizing if the child’s age is unknown. Continuous end-tidal carbon dioxide monitoring is critical for verifying tube placement and ventilation and enables earlier detection of ROSC than pulse checks.[16] For detailed guidance on pediatric and neonatal resuscitation, refer to the StatPearls learning activity on the subject.[17] December 2025 Pediatric Advanced Life Support and Basic Life Support Guideline Updates The AHA and the American Academy of Pediatrics (AAP) have published updated guidelines for PALS and Basic Life Support (BLS). PALS guidelines reaffirm the emergency management protocols for bradycardia, tachycardia, and pulseless arrest in children. (Sources: AHA and AAP Pediatric Bradycardia With a Pulse Algorithm, 2025; AHA and AAP Pediatric Tachyarrhythmia With a Pulse Algorithm, 2025; AHA and AAP Pediatric Cardiac Arrest Algorithm, 2025)

The AHA and the American Academy of Pediatrics (AAP) have published updated guidelines for PALS and Basic Life Support (BLS). PALS guidelines reaffirm the emergency management protocols for bradycardia, tachycardia, and pulseless arrest in children. (Sources: AHA and AAP Pediatric Bradycardia With a Pulse Algorithm, 2025; AHA and AAP Pediatric Tachyarrhythmia With a Pulse Algorithm, 2025; AHA and AAP Pediatric Cardiac Arrest Algorithm, 2025) During CPR, PALS recommends end-tidal carbon dioxide monitoring when feasible and introduces new diastolic blood pressure targets of 25 mm Hg in infants and at least 30 mm Hg in children when invasive arterial monitoring is available. Key updates to pediatric BLS include recommendations for the heel-of-one-hand or thumb-encircling technique for cardiac compressions in infants (the 2-finger technique is no longer recommended) and administration of naloxone during CPR for suspected opioid overdose.[18] (Source: AHA and AAP Pediatric BLS Algorithm, 2025)

Noncardiac causes often predominate in pediatric cardiopulmonary arrest and warrant prioritization during the initial assessment. Respiratory etiologies, including infection, airway obstruction, and drowning, frequently result in hypoxia and PEA or asystole. Trauma, particularly to the head or chest, may produce respiratory failure, hemorrhage, or direct cardiac injury. Sepsis represents a critical consideration, especially in children presenting with fever and poor perfusion. Myocarditis may precipitate arrhythmias or pump failure in previously healthy patients, while cardiac tamponade should be suspected in cases of trauma or known pericardial disease. Pulmonary embolism, though uncommon, can occur in adolescents with risk factors such as central venous line use or hypercoagulable states. Cardiac causes warrant consideration, particularly in sudden collapse without preceding respiratory compromise. Structural heart defects, including tetralogy of Fallot, Ebstein anomaly, and transposition of the great arteries, may remain undiagnosed in infancy. Coronary artery anomalies and aortic dissection (eg, in Marfan syndrome) can result in ischemia or rupture. Arrhythmogenic conditions, such as hypertrophic cardiomyopathy, long QT syndrome, Brugada syndrome, Wolff-Parkinson-White syndrome, dilated cardiomyopathy, and arrhythmogenic right ventricular cardiomyopathy, may precipitate ventricular tachycardia or ventricular fibrillation as the initial arrest rhythm.[19] A broad differential should be maintained. Priority should be given to reversible and common causes to optimize resuscitation outcomes.

An observational study by the AHA, conducted from January 2000 to December 2018, reported that survival rates for pediatric IHCA increased from 19% to 32%. In contrast, survival for pediatric OHCA remains significantly lower, ranging from 5% to 6%. Pulseless bradycardic rhythms, including PEA, asystole, and bradycardia with poor perfusion, account for over 50% of pediatric cardiac arrests. Ventricular fibrillation and pulseless ventricular tachycardia comprise approximately 10% of initial arrest rhythms and are associated with more favorable outcomes than PEA or asystole. Secondary ventricular fibrillation or pulseless ventricular tachycardia during CPR correlates with the poorest outcomes, likely reflecting progressive myocardial injury during resuscitation. Survival rates for children with IHCA have improved most notably in intensive care settings, ranging from 78% to 90%. Overall survival to hospital discharge remains approximately 32%. Favorable neurologic outcomes are reported in 64% to 95% of children surviving to discharge, although data on long-term global neurologic function remain limited.[20]

Many survivors experience neurologic impairments affecting speech, memory, motor function, and decision-making. Factors associated with improved survival include witnessed cardiac arrest, shorter CPR duration, a shockable presenting rhythm, younger patient age, and occurrence of arrest in an in-hospital setting.

Public Education AHA data indicate that early bystander CPR approximately doubles survival after OHCA. However, an AHA survey found that only half of Americans feel comfortable performing this intervention. In 2010, the AHA revised bystander guidelines to emphasize compression-only CPR, eliminating rescue breaths. Current recommendations involve a 2-step approach: call 911 and deliver hard, fast compressions to the center of the chest. Healthcare Professional Education Potential warning signs of impending pediatric arrest require prompt recognition by primary care and emergency clinicians, who should initiate appropriate testing and referrals. Concerning features include exercise-related chest pain, unexplained or recurrent syncope—particularly during activity—palpitations, lightheadedness, and undiagnosed heart murmurs. Early identification of these symptoms, followed by directed evaluation, correlates with improved outcomes. Caregiver Education Most OHCA cases in infancy are attributable to sudden infant death syndrome. An initial decline in deaths was observed after the AAP’s 1992 recommendation to sleep supine. Recent plateaus prompted expanded safe-sleep guidelines, including supine positioning on a firm surface, room-sharing without bed-sharing, adherence to routine immunizations, pacifier use, and avoidance of soft bedding, overheating, and exposure to tobacco, alcohol, or illicit drugs. Additional caregiver instruction should cover proper use of child safety seats and seatbelts, drowning and choking prevention, home childproofing, recognizing and preventing poisoning, and completing CPR and first aid training.

A modified ABCDE approach guides code management in pediatric cardiac arrest, with each component serving as a reminder of critical actions during resuscitation. The structured framework facilitates role clarity, prioritization, and clinical decision-making under pressure. The modified ABCDE framework includes the following: A: Assign appropriate resuscitation roles to code team members. A: Assess ABCDE. A: Anticipate clinical needs and potential complications. A: Airway must be managed with cervical spine control if trauma is suspected. B: BLS measures should be performed effectively. B: The Broselow tape must be used to estimate weight, drug dosages, and equipment sizing. C: CPR should be initiated with high-quality chest compressions. C: Cardiac monitor must be attached for rhythm identification. D: Disability should be assessed, including neurologic function. D: Drugs must be administered according to PALS algorithms. D: Disposition for postresuscitation care or transport should be planned. E: Exposure of the entire body must be performed to inspect for injuries or signs of illness. E: Environment control should be ensured by managing ambient temperature and limiting crowd presence.[21][22][23] In the adult population, the Universal Termination of Resuscitation guidelines identify cases of OHCA that are unlikely to achieve ROSC. In a study of 36,543 patients, termination of efforts was supported if all of the following criteria were met after at least 4 two-minute CPR cycles: EMS did not witness the arrest. ROSC was not achieved. No shocks were delivered. No definitive intra-arrest markers reliably predict futility in pediatric cardiac arrest. Poor prognostic indicators include delayed bystander CPR and EMS activation. Children who fail to achieve ROSC after receiving prolonged resuscitation and 2 doses of epinephrine rarely survive.

Pediatric cardiopulmonary arrest is uncommon but often results in poor outcomes. Early recognition of impending cardiopulmonary failure, delivery of high-quality CPR, and appropriate postresuscitation care are critical to improving survival. Although respiratory causes account for most arrests, healthcare professionals must recognize signs of failure regardless of etiology. IHCA occurs more frequently than OHCA in children and generally yields better outcomes. Oxygen deprivation during arrest causes cellular edema with systemic organ damage. Within the confined intracranial space, swelling increases pressure and may result in long-term neurological dysfunction. Healthcare professionals must prepare for the arrival of a child in cardiopulmonary arrest, with specific roles assigned under the direction of a dedicated team leader. Treatment depends on the presenting cardiac rhythm, whether asystole, PEA, ventricular fibrillation, or pulseless ventricular tachycardia, and includes early defibrillation for shockable rhythms. Epinephrine administration should occur via the intravenous, intraosseous, or endotracheal route. The team must also evaluate potential reversible causes of arrest as outlined by the mnemonic "Hs and Ts." Clear communication among team members is essential, including identification of the presenting rhythm, timing, and appropriate pediatric dosing of epinephrine, as well as feedback on chest compression quality. Although no reliable predictors exist for outcomes or timing of resuscitation termination, delayed bystander CPR, prolonged resuscitation, nonshockable rhythms, and lack of ROSC after administering 2 epinephrine doses predict poor survival. The team should discuss the duration of resuscitative efforts, the interventions performed, and the likelihood of a favorable outcome before deciding to terminate resuscitation.