Which of the following would explain why a person might need an implanted pacemaker device?

Which of the following would explain why a person might need an implanted pacemaker device?
 
  A) There is a problem with the electrical system in the heart.
  B) The heart muscle is damaged and is unable to contract.
  C) Their potassium levels are too low which prevents depolarization.
  D) They have malfunctioning valves between the cardiac chambers.

Question 2

You are dispatched to a call for a two-year-old not breathing. When responding, you realize that your FIRST responsibility is to:
 
  A) mentally prepare for what might be required on-scene.
  B) arrive at the scene safely with no mishaps.
  C) review the protocol for pediatric cardiac arrest.
  D) get to the scene as quickly as possible.

Question 3

Pressure in the filled ventricle at the end of diastole is called:
 
  A) afterload.
  B) preload.
  C) cardiac output.
  D) stroke volume.

Question 4

Your crew responds to a motor vehicle crash where a four-door pickup truck has crashed into a tree. One man was ejected and is obviously dead and a woman is unconscious still in her seatbelt. You notice a car seat in the back with various toys scattered about the scene. Which of the following is MOST crucial?
 
  A) Call for extrication assistance
  B) Contact law enforcement for traffic control
  C) Begin searching for additional patients
  D) Call for aeromedical transportation