Pediatric ECG interpretation requires age-specific knowledge that differs meaningfully from adult ECG. This page covers the core competencies: age-stratified rate thresholds, the most common misinterpreted normal variants, critical PALS differentials, and advanced congenital heart telemetry patterns.
Normal pediatric heart rates vary dramatically by age. A rate of 160 bpm is bradycardia in a neonate and tachycardia in a school-age child. Using adult rate thresholds produces systematic errors in pediatric ECG interpretation — both over-escalation (alarming on normal neonatal rates) and under-escalation (missing bradycardia in infants).
The most commonly over-escalated normal pediatric finding. RSA produces smooth cyclic R-R variation directly linked to breathing. It reflects healthy vagal tone — NOT AFib, NOT ectopy. Uniform sinus P-waves before every QRS, no dropped beats, respiratory-synchronized variability. Escalating RSA as an arrhythmia is a clinical error.
SVT is the most common pathologic tachyarrhythmia in infants. Rate > 220 bpm, fixed regardless of state (feeding, crying, sleeping). Absent organized P-waves. Poor feeding, pallor, tachypnea, and mottled skin signal hemodynamic compromise. Management: ice-to-face vagal maneuver (infants), then adenosine rapid IV push, then synchronized cardioversion for unstable presentations.
In children, bradycardia is caused by hypoxia until proven otherwise. PALS mandates: ventilate FIRST. Thirty seconds of effective BVM ventilation with supplemental O₂ should reverse hypoxic bradycardia. Giving atropine before ventilating treats a symptom and delays the life-saving intervention. HR < 60 with poor perfusion not responding to ventilation → CPR.
Six structured clinical cases with decision points, nursing error traps, and PALS algorithm pathways.
4-Month-Old with SVT and Poor Feeding
Ice-water vagal maneuver → adenosine → synchronized cardioversion
8-Year-Old: Severe Asthma with Pulsus Paradoxus
Pulsus paradoxus assessed by BP cuff (hemodynamic finding, not rhythm)
Post-op Tetralogy of Fallot — JET Recognition
Cooling protocol, minimize catecholamines — NOT cardioversion
14-Year-Old: Exertional Syncope and Long QT
Magnesium + drug discontinuation + LQTS workup
7-Year-Old: Tumor Lysis + Widening QRS
IV calcium first (membrane stabilization) before potassium removal
2-Year-Old: Hypoxic Bradycardia → Arrest
BVM first → if HR < 60 after 30s → CPR → epinephrine
Pediatric ECG interpretation requires different normal rate thresholds, different rhythm recognition criteria, different algorithm logic, and different management priorities. A heart rate of 220 bpm triggers a very different response in a 3-month-old (possible SVT — assess and treat) versus a 30-year-old (same, but different vagal maneuver and adenosine approach). Scoring pediatric ECG performance against adult ACLS competency benchmarks produces inaccurate mastery assessments. The NurseNest Pediatric ECG lane is separated from the adult ECG module to ensure age-appropriate standards are applied throughout.
Respiratory sinus arrhythmia is a normal physiologic variation where heart rate increases slightly with inspiration and decreases with expiration. It is caused by vagal tone fluctuations with the respiratory cycle (Bainbridge reflex). It is most prominent in healthy children and athletes — precisely the patients with the highest vagal tone. RSA produces an irregular-appearing rhythm strip that can trigger monitoring alarms and nurse concern. Key teaching: RSA has uniform sinus P-waves before every QRS, no dropped beats, and R-R variation that correlates exactly with the respiratory cycle. It is NOT AFib, NOT ectopy. Escalating RSA as an arrhythmia is a clinical error that causes unnecessary interventions.
JET is a common post-operative arrhythmia after pediatric cardiac surgery — particularly tetralogy of Fallot repair, VSD repair, and AV canal repair. It presents as a near-narrow complex tachycardia with AV dissociation: QRS rate is FASTER than the P-wave rate. Unlike SVT, JET does not respond to adenosine or synchronized cardioversion — these are ineffective. First-line management is therapeutic hypothermia (cooling to 34–35°C core temperature), minimizing catecholamine infusions, and maximizing sedation. Antiarrhythmics (amiodarone or procainamide) are used secondarily per the cardiac surgery team. Nurses must recognize that attempting to cardiovert JET is inappropriate and potentially harmful.
Prolonged QTc in children: > 450 ms in boys, > 460 ms in girls (corrected for rate using Bazett formula). QTc > 500 ms indicates high torsades de pointes risk regardless of sex. Clinical presentations include exertional syncope (LQT1 — triggered by swimming or exercise), syncope with auditory startle (LQT2), or nocturnal syncope (LQT3). Family history of unexplained sudden cardiac death in a young person is a major risk indicator. Drug review is essential: azithromycin, ondansetron, antipsychotics, and many common pediatric medications prolong QTc. IV magnesium 25–50 mg/kg (max 2g) is first-line for active torsades in children.
Yes. The Pediatric ECG lane is included with eligible RN and NP base subscriptions. It includes 9 curriculum topics covering pediatric rhythm recognition and PALS algorithms, 6 PALS deterioration case simulations with interactive decision points, 50 clinician-reviewed practice questions across 6 categories (RSA, SVT, hypoxic bradycardia, PALS arrest rhythms, pulsus paradoxus clinical context, post-op JET), and full governance separation from the adult ECG module to prevent mastery score contamination.
Full pediatric ECG lane with PALS case simulations and 50 clinician-reviewed questions. Included with eligible RN and NP subscriptions.
