Study guide
12.2 Post-Arrest Hemodynamic Support
AHA PALS Provider Pediatric Advanced Life Support
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1 Chapter 1: Course Overview & Exam Logistics
1.1 Current Exam Facts 1.2 Audience, Prerequisites & Study Plan
2 Chapter 2: Systematic Pediatric Assessment
2.1 Pediatric Assessment Triangle (PAT) 2.2 Evaluate–Identify–Intervene Sequence 2.3 Primary Assessment: ABCDE 2.4 Secondary Assessment, SAMPLE & Vitals by Age
3 Chapter 3: Respiratory Distress & Failure
3.1 Respiratory Distress vs Failure 3.2 Recognition & Immediate Intervention Priorities 3.3 Oxygen Delivery & Basic Airway Support
4 Chapter 4: Airway Problems & Ventilation Strategies
4.1 Upper Airway Obstruction 4.2 Lower Airway, Lung Tissue Disease & Disordered Control 4.3 Bag-Mask Ventilation & Advanced Airways During CPR
5 Chapter 5: Shock Fundamentals & Hypovolemia
5.1 Compensated vs Hypotensive (Decompensated) Shock 5.2 Hypovolemic Shock 5.3 Isotonic Fluid Bolus 10–20 mL/kg & Reassessment
6 Chapter 6: Distributive, Cardiogenic & Obstructive Shock
6.1 Distributive & Septic Shock Pathway 6.2 Cardiogenic Shock 6.3 Obstructive Shock
7 Chapter 7: Pediatric BLS & High-Quality CPR
7.1 High-Quality CPR Metrics 7.2 Compression-Ventilation Ratios 7.3 CPR Quality Monitoring: ETCO2 & Diastolic BP
8 Chapter 8: Pediatric Cardiac Arrest Algorithm
8.1 Arrest Recognition & Systematic Approach 8.2 VF/pVT & Defibrillation Energy 8.3 Asystole & PEA 8.4 Epinephrine in Arrest: Dose & Timing
9 Chapter 9: Bradycardia & Narrow-Complex Tachycardia
9.1 Bradycardia with Poor Perfusion 9.2 Sinus Tachycardia vs SVT 9.3 Stable SVT: Vagal Maneuvers & Adenosine
10 Chapter 10: Unstable Tachycardia & Wide-Complex Rhythms
10.1 Unstable Tachycardia & Synchronized Cardioversion 10.2 Wide-Complex Tachycardia & VT with Pulse 10.3 Antiarrhythmics for Tachycardia with Pulse
11 Chapter 11: Reversible Causes & Special Circumstances
11.1 Reversible Causes: The H's and T's 11.2 Special Circumstances at Exam Level 11.3 Extracorporeal CPR (ECPR) Overview
12 Chapter 12: Post–Cardiac Arrest Care
12.1 Post-ROSC Oxygenation & Ventilation 12.2 Post-Arrest Hemodynamic Support 12.3 Temperature Control & Glucose 12.4 Neuroprognostication & Transport
13 Chapter 13: Vascular Access & Core Pharmacology
13.1 IV and Intraosseous Access 13.2 Epinephrine Dosing in Depth 13.3 Amiodarone, Lidocaine & Adenosine 13.4 Weight-Based Dosing Aids & Drugs to Avoid Routinely
14 Chapter 14: Team Dynamics & Megacode Readiness
14.1 High-Performance Team Roles 14.2 Closed-Loop Communication 14.3 Constructive Intervention, Debriefing & Exam Integration
12.2 Post-Arrest Hemodynamic Support
Key Takeaways Explain This Topic AI
2025 PALS hemodynamic goal after cardiac arrest: maintain systolic and mean arterial blood pressure greater than the 10th percentile for age and sex.
Post–cardiac arrest syndrome commonly combines myocardial dysfunction (stunning) with vasoplegia—hypotension is expected and must be treated aggressively.
Use isotonic crystalloid carefully with reassessment; smaller boluses are often wiser when cardiogenic features or heart failure signs are present.
Add vasoactive/inotropic infusions for persistent shock matched to the shock physiology (cardiogenic, distributive, hypovolemic, or mixed).
Trend lactate, urine output, mental status, and perfusion exam—not blood pressure alone—to judge whether oxygen delivery is improving.
Last updated: August 2026
Why Blood Pressure Targets Matter After Pediatric ROSC
After ROSC, the brain’s autoregulation may be impaired. Cerebral blood flow becomes more dependent on adequate systemic perfusion pressure . Even brief recurrent hypotension can extend ischemic injury. Observational pediatric data associate early post-arrest hypotension with worse survival and neurologic outcomes. That evidence underpins a major 2025 AHA/AAP PALS hemodynamic recommendation:
After cardiac arrest in infants and children, maintain systolic blood pressure (SBP) and mean arterial pressure (MAP) greater than the 10th percentile for age and sex .
Memorize this as a full phrase. Older materials sometimes emphasized only the 5th percentile as a hypotension floor; 2025 teaching raises the operational post-arrest floor to above the 10th percentile for both SBP and MAP . On exam items, prefer the >10th percentile answer when the stem is post–cardiac arrest care.
What “10th percentile for age and sex” means in practice
You are not expected to recite every percentile table from memory on every age, but you must know:
Post-arrest BP goals are age- and sex-specific , not a single adult-style “MAP 65 for everyone.”
Both SBP and MAP matter—do not fixate on one number while ignoring the other.
Use reference charts, length-based resuscitation aids, and PICU protocols at the bedside; use the >10th percentile rule on the exam.
Treat hypotension early and aggressively ; “watchful waiting" while the brain is underperfused is the wrong branch.
- Parameter 2025 post-arrest teaching goal
- SBP > 10th percentile for age and sex
- MAP > 10th percentile for age and sex
- Clinical perfusion Improving mentation trend, pulses, CRT, urine output, falling lactate
Contrast with pre-arrest shock recognition thresholds (for example, age-based hypotension formulas in Chapter 5). Those help you diagnose decompensated shock before arrest. After arrest , the explicit PALS post-ROSC blood-pressure recommendation is the >10th percentile SBP and MAP standard.
Post-Arrest Shock Physiology: Stunning + Vasoplegia
Post–cardiac arrest circulatory failure is often mixed :
Myocardial dysfunction / stunning: Global ischemia impairs contractility. Ejection fraction can fall for hours even if coronary arteries are normal. The child may show cool extremities, weak pulses, hepatomegaly, pulmonary edema, or rising lactate with high filling pressures.
Vasoplegia / distributive features: Ischemia–reperfusion triggers cytokine release and endothelial dysfunction, producing inappropriate vasodilation and capillary leak similar to septic physiology.
Residual hypovolemia: Fluid losses, capillary leak, positive-pressure ventilation, and incomplete pre-arrest resuscitation leave the vascular bed underfilled.
Ongoing primary cause: Hemorrhage, sepsis, tamponade, tension pneumothorax, ductal-dependent lesions, toxin effects, or arrhythmia may still be active.
Treat the shock type you see—reassess after every intervention
Predominant picture Clues Initial support emphasis
Hypovolemic / distributive underfill Flat veins, dry history, warm or cool shock without congestion Isotonic crystalloid bolus with reassessment
Cardiogenic / stunning Crackles, hepatomegaly, gallop, high CVP, cardiomegaly, echo low EF Cautious smaller fluid aliquots; early inotrope/vasoactive support
Obstructive Unilateral breath sounds, JVD, trauma, sudden PEA history Relieve obstruction (e.g., needle decompression, pericardiocentesis per indication)
- Mixed post-arrest Common after prolonged CPR Fluids as tolerated + vasoactives + treat cause
- Fluids after ROSC
Isotonic crystalloid remains first-line volume therapy when hypovolemia or vasoplegia with underfill is likely. Teaching patterns from post-arrest care algorithms include crystalloid boluses (often discussed around 10–20 mL/kg , with some cards citing 20 mL/kg for volume expansion) with mandatory reassessment after each bolus . If there are signs of poor cardiac function or heart failure , use smaller aliquots (commonly taught 5–10 mL/kg ) and reassess for pulmonary edema or worsening congestion before repeating.
Never pour unlimited fluid into a stunned myocardium. If blood pressure remains below the 10th-percentile goal after appropriate volume, start pharmacologic cardiovascular support rather than drowning the lungs.
Vasoactive and inotropic support (exam-level framework)
Agent choice is protocol- and physiology-dependent; know the conceptual map:
Vasopressors (increase vascular tone) help vasoplegic hypotension when the vascular bed is dilated.
Inotropes (increase contractility) help myocardial stunning with low cardiac output.
Epinephrine infusions are commonly used in pediatrics because they provide combined inotropic and vasopressor effects across a dosing range.
Norepinephrine, dopamine, milrinone, dobutamine , and other agents appear in critical-care protocols based on systemic vascular resistance, heart rate, and ventricular function.
For refractory cardiogenic shock in highly selected centers, mechanical support / ECLS may be considered (see ECPR/ECLS context in Chapter 11).
The written exam cares less about memorizing every mcg/kg/min table and more about: BP >10th percentile for age/sex , treat hypotension aggressively , match therapy to shock type , and reassess .
Loading diagram... Post-Arrest Hemodynamic Loop
Monitoring Beyond the Cuff Number
Blood pressure is necessary but not sufficient. Oxygen delivery and organ perfusion are judged with a bundle of trends :
Lactate
Lactate rises when tissues are ischemic or when clearance is impaired. After ROSC, a falling lactate over serial measurements supports improving oxygen delivery. A persistently high or rising lactate should trigger a search for ongoing shock, seizure activity, severe anemia, inadequate cardiac output, or residual arrest cause—not automatic reassurance because a single BP reading looks acceptable.
Urine output
Adequate renal perfusion typically produces age-appropriate urine output over time (commonly taught near ≥1 mL/kg/h as a rough pediatric perfusion marker in many critical-care contexts). Oliguria after ROSC may reflect acute kidney injury from the arrest, ongoing hypoperfusion, or abdominal compartment issues—interpret with the whole picture.
Mental status trends
Improving interactiveness is encouraging but confounded by sedation, temperature control, and seizures. Worsening coma after an initial improvement warrants urgent reassessment of oxygenation, CO2, glucose, BP, and neuroimaging/EEG pathways.
Invasive monitoring when available
An arterial line provides continuous BP and easy ABG sampling—highly valuable when vasoactive drips are titrated. Central venous access supports infusions and mixed/central venous saturation trends in ICU practice. Bedside echocardiography distinguishes underfilling from pump failure and can exclude tamponade.
Clinical scenario (synthesis)
A 2-year-old girl has ROSC after septic arrest. SpO2 is titrated to 96%. BP is 72/38 mm Hg with weak pulses and rising lactate; age/sex charts show both SBP and MAP below the 10th percentile . The team gives a careful crystalloid bolus with reassessment, starts an epinephrine infusion for mixed cardiogenic-distributive post-arrest shock, targets SBP and MAP >10th percentile , trends lactate and urine output, and arranges PICU transfer. Choosing observation alone because “she has a pulse now” would miss the 2025 hemodynamic mandate.
Bottom line for 12.2: After pediatric cardiac arrest, keep SBP and MAP above the 10th percentile for age and sex , treat post-arrest myocardial dysfunction and vasoplegia with fluids (reassessed) and vasoactives matched to shock type , and follow lactate, urine output, mentation, and perfusion trends —not blood pressure in isolation.