NORCET-7 Mains-2024: An example of Distributive shock?

NORCET-7 Mains-2024

Medical & Surgical Nursing

Easy

Appeared in: NORCET-7 Mains-2024

Explanation

Distributive shock is characterized by widespread vasodilation (widening of blood vessels), which causes a sharp decrease in systemic vascular resistance (SVR).
Anaphylactic shock is a classic example of distributive shock.
During anaphylaxis, a massive release of histamine and other inflammatory mediators causes profound arterial and venous dilation.
This vasodilation leads to a relative hypovolemia, where the vascular space is too large for the circulating blood volume, resulting in severe hypotension.

Option A: Cardiogenic shock is incorrect because it results from primary cardiac pump failure, not vasodilation. The primary problem is the heart's inability to contract effectively.
Option B: Hypovolemic shock is incorrect because it is caused by an absolute loss of blood or fluid volume (e.g., from bleeding or dehydration), not a redistribution of fluid due to vasodilation.
Option D: Obstructive shock is incorrect because it is caused by a physical blockage of blood flow, which prevents the heart from filling or pumping effectively. It is a mechanical problem, not a vascular tone problem.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification and Pathophysiology of Shock as background academic context rather than a clinical decision trigger.
Rapidly identifying the type of shock is critical for nurses as it determines the immediate life-saving interventions. For distributive shock like anaphylaxis, the priority is administering epinephrine to cause vasoconstriction and reverse bronchospasm.
In any shock state, the nurse's primary goals are to optimize oxygen delivery, support blood pressure, and treat the underlying cause.
What if? If a patient presented with hypotension, jugular venous distention, and muffled heart sounds after chest trauma, the diagnosis would shift to Obstructive shock (specifically, cardiac tamponade). The priority intervention would be preparing for an emergency pericardiocentesis, not administering epinephrine or large fluid volumes.

How to Approach the Question

First, identify the core concept being tested, which is the classification of shock.
Read the question stem carefully to identify the specific type of shock asked for: 'Distributive shock'.
Recall the defining pathophysiological feature of distributive shock, which is widespread vasodilation leading to a relative loss of volume.
Evaluate each option against this definition.
Cardiogenic shock is pump failure. Hypovolemic shock is absolute volume loss. Obstructive shock is a physical blockage.
Anaphylactic shock is caused by a massive release of vasodilating substances (histamine), which directly matches the definition of distributive shock.

Concept Tested & Keywords

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