New 2025 PALS AHA guidelines

1. THE 2-MINUTE PHYSIOLOGY (Rapid Pathophysiology)

• The Asphyxial Arrest: Unlike adult cardiac arrest, which is predominantly arrhythmogenic, pediatric cardiac arrest is almost universally driven by a progressive asphyxial and hypoxic cascade. Hypoxia triggers a profound vagal response, leading to severe bradycardia.
• The Rate-Dependent Pump: The pediatric myocardium lacks the compliance and contractile reserve of an adult heart; therefore, cardiac output is strictly dependent on heart rate.
• Hemodynamic Perfusion Targets: The 2025 updates emphasize the critical physics of coronary perfusion pressure (CPP) during compressions. Without adequate diastolic pressure generated by high-quality compressions, the myocardium remains ischemic, preventing the return of spontaneous circulation (ROSC).

2. THE BEDSIDE ACTION PLAN (Rapid ER Management)

• Chest Compressions (2025 Update): The 2025 guidelines have eliminated the 2-finger chest compression technique for infants. You must exclusively utilize the 1-hand or 2 thumb-encircling hands technique to ensure proper, consistent compression depth.
• Early Epinephrine (2025 Update): For initial non-shockable rhythms (Asystole/PEA), there is a strict mandate to administer Epinephrine as soon as possible, rather than waiting for multiple CPR cycles to complete.
• Defibrillation: For pulseless VT or VF, defibrillate using a 2 to 4 J/kg pediatric dose.
• Invasive Hemodynamic Targets (2025 Update): If invasive arterial monitoring is in place during CPR, resuscitate to specific physiologic targets rather than just relying on standard compression mechanics. Target a diastolic blood pressure of (\ge)25 mmHg for infants and (\ge)30 mmHg for children ((\ge)1 year of age).
• Severe Foreign Body Airway Obstruction (FBAO) (2025 Update): For severe choking, the protocol strictly mandates alternating 5 back blows and 5 chest thrusts for infants. Abdominal thrusts remain appropriate for older children but are strictly contraindicated in infants.

3. THE DIAGNOSTIC GRID (Differential Diagnosis & Workup)

• Top "Can't-Miss" Reversible Causes (The 5 H's and 5 T's):
• H's: Hypovolemia, Hypoxia, Hydrogen ion (acidosis), Hypo-/Hyperkalemia, Hypothermia.
• T's: Toxins, Tamponade (cardiac), Tension pneumothorax, Thrombosis (coronary/pulmonary).
• Prioritized Diagnostic Workup:
• Tier 1: Bedside point-of-care glucose (critical in pediatrics), continuous ECG rhythm analysis, and continuous waveform capnography (ETCO2).
• Tier 2: Venous or Arterial Blood Gas to evaluate for severe acidosis (Hydrogen ion) and electrolyte panels to rule out hyperkalemia.

4. THE VISUAL BOARD (ECG / POCUS / Imaging)

• Waveform Capnography (ETCO2): Visually tracking the ETCO2 waveform is essential for monitoring CPR quality and identifying ROSC. A sudden, sustained spike in ETCO2 visually confirms the return of spontaneous circulation.
• ECG Rhythm Analysis: Rapidly visually categorize the rhythm into "Shockable" (VF/pVT) to mandate immediate electricity (2-4 J/kg), or "Non-Shockable" (PEA/Asystole) to mandate immediate Epinephrine.
• POCUS: Point-of-care ultrasound can be used during rhythm checks to evaluate for cardiac tamponade or profound hypovolemia, but it must never delay or interrupt chest compressions.

5. THE SCORING MATRIX (Risk Stratification & Guidelines)

• Post-Arrest Care Targets (2025 Update): Following ROSC, permissive hypotension is lethal to the recovering pediatric brain. The 2025 guidelines dictate maintaining systolic and mean arterial blood pressure (MAP) strictly above the 10th percentile for the patient's age.
• The ETCO2 Termination Rule (2025 Update): While ETCO2 is highly useful for monitoring CPR quality, the 2025 guidelines issue a strict warning: a specific, low ETCO2 cutoff value alone should never be used as the sole indication to terminate resuscitation in pediatric patients.

6. THE DANGER ZONE (Pitfalls & Critical Actions)

• Pitfall - The 2-Finger Infant Compression: Utilizing the traditional 2-finger technique during infant CPR. Critical Action: This has been eliminated in 2025; you must immediately transition to the 2 thumb-encircling hands technique to guarantee adequate diastolic filling and compression depth.
• Pitfall - Infant Abdominal Thrusts: Attempting the Heimlich maneuver (abdominal thrusts) on a choking infant. Critical Action: Abdominal thrusts are strictly prohibited in infants due to the high risk of liver/spleen laceration. Alternate 5 back blows and 5 chest thrusts instead.
• Pitfall - Delayed Epinephrine in PEA: Waiting for vascular access to be perfectly secured and multiple cycles of CPR to pass before giving Epinephrine for Asystole/PEA. Critical Action: Epinephrine must be administered as soon as possible in non-shockable arrests.
• Pitfall - Premature Termination: Calling the code solely because the ETCO2 has remained below 10 mmHg for 20 minutes. Critical Action: The 2025 guidelines strictly prohibit using ETCO2 as a standalone termination criterion in children.

7. MCQ MASTERCLASS (Written Exam Tips)

• High-Yield 2025 Update Fact: If a question asks for the target diastolic blood pressure during CPR in an infant with an arterial line, the exact cutoff is (\ge)25 mmHg (and (\ge)30 mmHg for children >1 year).
• Common Distractor: A question describes an infant in cardiac arrest and asks for the best compression technique. An option will suggest "2-finger compressions just below the nipple line." Differentiate: The 2025 AHA PALS update eliminated this. The correct answer will specify the 2 thumb-encircling hands or 1-hand technique.
• Common Distractor: A 6-month-old infant is choking on a toy and becomes apneic but has a pulse. An option suggests "Deliver 5 abdominal thrusts." Differentiate: This is a lethal trap. The correct answer is 5 back blows followed by 5 chest thrusts.

8. THE BOARDROOM SCRIPT (OSCE & Oral Board Tips)

• The Opening Salvo: "This is a pediatric cardiac arrest. My immediate priority is high-quality CPR. Because this is an infant, I am explicitly instructing my team to use the 2 thumb-encircling hands technique to ensure optimal depth, as the 2-finger technique is no longer recommended."
• Articulating the Resuscitation: "The monitor shows Pulseless Electrical Activity (PEA). Because this is a non-shockable rhythm, per the 2025 guidelines, I want Epinephrine administered as soon as possible via IO or IV without waiting for further cycles. I will attach continuous waveform capnography to monitor CPR quality."
• Hemodynamic Precision: "We have an arterial line in place. I am observing the waveform to ensure we are hitting our targeted diastolic blood pressure of at least 25 mmHg for this infant to optimize coronary perfusion."
• The Post-Arrest Phase: "We have achieved ROSC. To prevent secondary brain injury, I will actively manage hemodynamics to maintain the patient's systolic and mean arterial blood pressure strictly above the 10th percentile for their age."