CPR Electrical Therapy Principles 2

Question 1

Which waveform type is used by most modern defibrillators and requires less energy than older monophasic devices?

Accepted Answer

Biphasic waveform

Answer

Biphasic waveforms deliver current in two directions and are more effective at lower energy levels than monophasic waveforms.

Question 2

When performing transcutaneous pacing, the rate for a symptomatic bradycardia patient is typically set to:

Accepted Answer

60-80 bpm

Answer

Transcutaneous pacing for symptomatic bradycardia is typically initiated at 60-80 bpm to restore adequate perfusion.

Question 3

A patient in ventricular fibrillation receives a shock but immediately returns to VF. What is the recommended next step?

Accepted Answer

Resume CPR for 2 minutes then reassess rhythm

Answer

After a failed shock, 2 minutes of high-quality CPR should resume to re-perfuse the myocardium before the next rhythm check.

Question 4

What term describes the minimum current needed to reliably capture the myocardium during transcutaneous pacing?

Accepted Answer

Capture threshold

Answer

Capture threshold is the minimum milliamp output needed to consistently depolarize the myocardium and produce a mechanical response.

Question 5

In synchronized cardioversion, the shock is timed to which part of the cardiac cycle?

Accepted Answer

QRS complex

Answer

Synchronized cardioversion delivers energy with the QRS complex to avoid the vulnerable T-wave period and prevent VF induction.

(CPR) Certified Paramedic Response Practice Test