The diagnostic procedure that directs high-frequency sound waves through the skin over the area of the body being examined and produces an image based on the echoes is called ________.

A 67-year-old female with severe chest pain becomes unresponsive, pulseless, and apneic during transport. You should:

A. defibrillate with the AED while continuing transport to the hospital. B. stop the ambulance, begin CPR, and attach the AED as soon as possible. C. perform CPR for 1 to 2 minutes and then analyze her rhythm with an AED. D. alert the receiving hospital and perform CPR for the duration of the transport.

What is implied by an abnormally prolonged PR interval?

a. Atrioventricular block b. Bundle-branch block c. Myocardial infarction d. Valvular detachment