North Carolina EMT State Practice Exam

What does obstructive shock result from?

1. Loss of blood volume

2. Mechanical obstruction of the heart

3. Severe allergic reactions

4. Infection leading to sepsis

The correct answer is: Mechanical obstruction of the heart

Obstructive shock occurs when there is a physical obstruction in the cardiovascular system that prevents adequate blood flow, thus leading to insufficient oxygen delivery to the tissues. This can be caused by several conditions, such as cardiac tamponade, tension pneumothorax, pulmonary embolism, or other mechanical interferences that prevent the heart from effectively pumping blood. By understanding the nature of obstructive shock, it's clear that it specifically results from these mechanical obstructions rather than issues stemming from blood volume loss, allergic reactions, or infections. While loss of blood volume leads to hypovolemic shock, allergic reactions can cause anaphylactic shock, and infections typically lead to septic shock, each condition has its unique mechanisms and pathophysiology. Therefore, the correct reason for obstructive shock aligns directly with the mechanical obstruction of the heart or vascular system.