A 3-year-old child presents to the emergency department with signs of septic shock: fever (39.5°C), tachycardia (HR 160/min), hypotension (BP 70/40 mmHg), delayed capillary refill (>2 seconds), and altered mental status. After rapid fluid resuscitation with 20 mL/kg normal saline bolus over 15 minutes, the child remains hypotensive and shows signs of poor perfusion. What is the first-line vasopressor agent of choice in pediatric septic shock?

## First-Line Vasopressor in Pediatric Septic Shock **Key Point:** Norepinephrine is the first-line vasopressor agent recommended by the Surviving Sepsis Campaign (SSC) 2020 Pediatric Guidelines for fluid-refractory pediatric septic shock — a significant update from older protocols that favored dopamine. ### Current Guideline Recommendation (SSC 2020) The SSC 2020 Pediatric Sepsis Guidelines (Weiss et al., *Intensive Care Medicine*, 2020) recommend: - **Norepinephrine** as the **first-line vasopressor** in pediatric septic shock refractory to fluid resuscitation - **Epinephrine** as an acceptable alternative or add-on, particularly in "cold shock" (low cardiac output state) - **Dopamine** is no longer the preferred first-line agent; it is considered an alternative when norepinephrine is unavailable ### Mechanism of Action of Norepinephrine Norepinephrine acts primarily as a potent **α1-adrenergic agonist** with moderate **β1-adrenergic** activity: - **α1 effects:** Peripheral vasoconstriction → increases systemic vascular resistance (SVR) → raises MAP - **β1 effects:** Mild positive inotropy → supports cardiac output without excessive tachycardia - Net result: Restores perfusion pressure with less tachycardia compared to dopamine or epinephrine ### Why Not Dopamine? - Dopamine was previously recommended as first-line in pediatric septic shock - However, evidence (including the SOAP II trial in adults and pediatric data) showed **higher rates of arrhythmia** and **increased mortality** with dopamine compared to norepinephrine - SSC 2020 updated pediatric guidelines to align with adult recommendations, making norepinephrine the preferred first-line agent ### Comparison with Other Vasopressors | Agent | Role in Pediatric Septic Shock | Notes | |-------|-------------------------------|-------| | **Norepinephrine** | **First-line** (SSC 2020) | Preferred vasopressor; less arrhythmia risk | | **Epinephrine** | Alternative first-line / add-on | Preferred in "cold shock" with low CO; increases lactate | | **Dopamine** | Alternative (if NE unavailable) | Higher arrhythmia risk; no longer preferred first-line | | **Phenylephrine** | Not recommended | Pure α-agonist; no inotropic support; worsens CO | **Clinical Pearl:** In pediatric septic shock, the hemodynamic phenotype matters: - **"Warm shock"** (vasodilatory, high CO, low SVR): Norepinephrine is ideal - **"Cold shock"** (low CO, high SVR): Epinephrine or dobutamine may be added to norepinephrine **High-Yield:** The SSC 2020 Pediatric Guidelines represent a paradigm shift — norepinephrine (not dopamine) is now the first-line vasopressor in pediatric septic shock, consistent with adult sepsis management. [cite: Weiss SL et al. Surviving Sepsis Campaign International Guidelines for the Management of Septic Shock and Sepsis-Associated Organ Dysfunction in Children. *Intensive Care Med.* 2020;46(Suppl 1):10–67]