Paediatric shock - the causes

paediatric shock Mar 23, 2026

Shock in children is a life‑threatening condition where the circulatory system fails to adequately deliver oxygen and nutrients to vital organs. Because children have strong compensatory mechanisms, they may appear stable until they are severely unwell, and rapid recognition of the underlying cause is absolutely essential for safe care.

At its core, shock arises from a breakdown in one or more elements needed for effective circulation: the pump (heart), volume (blood and fluids), or pipes (vessels). Different patterns of failure create distinct types of shock, each with different causes and implications.

Types of Shock and Common Causes:

  •  Hypovolaemic Shock – This is shock due to insufficient circulating volume. In children the most common causes are dehydration from diarrhoea and vomiting, severe burns, inadequate feeding, fluid loss related to diabetic ketoacidosis, or acute bleeding.
  •  Distributive Shock – Here the blood volume is present but misdistributed due to widespread vasodilation and leakage into tissues. The major cause in paediatrics is sepsis, driven by systemic infection and inflammatory mediator release. Other causes include anaphylaxis and high spinal cord injuries that disrupt vascular tone.
  •  Cardiogenic Shock – This arises from primary heart dysfunction where the heart cannot pump effectively. In children it is most often due to viral myocarditis, cardiomyopathies, or decompensation of congenital heart disease.
  •  Obstructive Shock – This results when blood flow is mechanically blocked, reducing cardiac output. Paediatric causes include cardiac tamponade, tension pneumothorax, massive pulmonary embolism and congenital obstructions such as coarctation of the aorta.

Understanding these causes helps perianaesthesia nurses anticipate deterioration, tailor monitoring, and support rapid treatment, whether this means fluid resuscitation, managing anaphylaxis, recognising sepsis early, or supporting children with cardiac dysfunction. 

References:

Green, M. & Patel, T. (n.d.). Paediatric Shock. TeachMePaediatrics.
Waltzman, M. (2011). Initial Management of Shock in Children.

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