North Carolina EMT State Practice Exam

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What is the primary blast stage also known as?

  1. Shockwave phase

  2. Impact phase

  3. Pressure wave

  4. Debris phase

The correct answer is: Pressure wave

The primary blast stage is commonly referred to as the pressure wave. This phase occurs immediately after an explosion when the explosive force generates a rapid increase in air pressure. As the explosion happens, a shockwave travels outward, causing devastating effects on surrounding structures and any living beings caught in its path. The term "pressure wave" accurately describes this phenomenon, as the initial wave of energy results in a brief but intense period of elevated pressure followed by a return to normal atmospheric pressure. Understanding this phase is crucial for EMTs, as injuries from blast events are often a direct result of this powerful pressure wave. Recognizing the implications of the pressure wave can aid in assessing the extent of injuries during triage and medical care for victims of explosive incidents.

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