The correct answer is C. Obstructive.

Why C is correct (Obstructive Shock):

Pericardial tamponade occurs when fluid accumulates in the pericardial sac, compressing the heart and preventing adequate filling of the ventricles. This leads to:

Decreased preload

Reduced cardiac output

Impaired circulation

This is classified as obstructive shock because there is a mechanical obstruction to blood flow, not a failure of the heart muscle itself.

NREMT-aligned cardiology guidelines state:

“Obstructive shock results from a physical obstruction to blood flow.”

“Examples include cardiac tamponade, tension pneumothorax, and pulmonary embolism.”

Why the other options are incorrect:

A. Cardiogenic: Caused by failure of the heart muscle (e.g., myocardial infarction), not external compression.

B. Distributive: Caused by widespread vasodilation (e.g., septic or anaphylactic shock).

D. Hypovolemic: Caused by loss of blood or fluids, not obstruction.

Exact Extracts:

“Cardiac tamponade is a cause of obstructive shock.”

“Obstructive shock impairs circulation due to mechanical obstruction.”

“Tamponade prevents normal cardiac filling and reduces output.”