Clinical scenario: Shock | septic shock | Management
A 6-year-old boy is brought to the emergency department with fever, lethargy, and poor feeding for one day. On examination, he is confused, heart rate is 180/min, respiratory rate is 48/min, blood pressure is 68/40 mmHg, capillary refill time is 6 seconds, peripheral pulses are weak, and his extremities are cold and mottled. Oxygen saturation is 95% while receiving high-flow oxygen. Two peripheral intravenous lines have been secured, blood cultures have been obtained, and broad-spectrum intravenous antibiotics have already been started.
Which of the following vasoactive agents is the preferred first-line infusion?
A. Adrenaline
B. Dobutamine
C. Dopamine
D. Noradrenaline
E. Vasopressin
Correct answer & Explanation:
Correct answer: A. Adrenaline
Explanation: Cold septic shock management
This child has cold septic shock, a form of septic shock characterized by reduced cardiac output and increased systemic vascular resistance.
The diagnosis is supported by:
- Fever with suspected infection
- Altered mental status (confusion)
- Tachycardia
- Hypotension (a late and ominous sign in children)
- Cold, mottled extremities
- Weak peripheral pulses
- Prolonged capillary refill (6 seconds)
These findings indicate decompensated septic shock with impaired tissue perfusion.
After prompt fluid resuscitation and administration of broad-spectrum antibiotics, adrenaline (epinephrine) is the preferred first-line vasoactive infusion for cold septic shock. Adrenaline improves myocardial contractility and cardiac output while providing appropriate vasoconstriction, thereby restoring tissue perfusion.
Why the other options are incorrect
A. Adrenaline
Correct. Adrenaline is the preferred first-line vasoactive agent for cold septic shock in children after appropriate initial fluid resuscitation.
B. Dobutamine
Dobutamine is primarily an inotropic agent used in children with myocardial dysfunction and low cardiac output after blood pressure has been stabilized. It is not the initial vasoactive drug for cold septic shock.
C. Dopamine
Dopamine was previously used as first-line therapy but is no longer recommended because studies have shown inferior outcomes and a higher incidence of arrhythmias compared with adrenaline.
D. Noradrenaline
Noradrenaline is preferred in warm (vasodilatory) septic shock, where children have warm extremities, bounding pulses, flash capillary refill, and low systemic vascular resistance.
E. Vasopressin
Vasopressin may be considered as an adjunctive agent in refractory septic shock but is not recommended as first-line vasoactive therapy in children.
Learning Point
Recognizing the hemodynamic pattern of septic shock is essential:
Cold septic shock
- Cold, mottled extremities
- Weak peripheral pulses
- Prolonged capillary refill
- Narrow pulse pressure
- Reduced cardiac output
- Preferred vasoactive agent: Adrenaline (epinephrine)
Warm septic shock
- Warm extremities
- Bounding pulses
- Flash capillary refill
- Wide pulse pressure
- Reduced systemic vascular resistance
- Preferred vasoactive agent: Noradrenaline (norepinephrine)
Early recognition, prompt antibiotics, appropriate fluid resuscitation, and timely initiation of vasoactive support are key determinants of survival in pediatric septic shock.
