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

Sinusoidal waveform

Answer

Monophasic waveform

Answer

Triphasic waveform

Question 2

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

Accepted Answer

60-80 bpm

Answer

40-50 bpm

Answer

100-120 bpm

Answer

150-180 bpm

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

Increase the defibrillation energy by 50 joules

Answer

Administer lidocaine before the next shock

Answer

Repeat the shock immediately at the same energy

Question 4

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

Accepted Answer

Capture threshold

Answer

Threshold current

Answer

Pacing impedance

Answer

Defibrillation threshold

Question 5

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

Accepted Answer

QRS complex

Answer

P wave

Answer

T wave

Answer

U wave

Question 6

A patient with stable supraventricular tachycardia at 180 bpm does not respond to vagal maneuvers or adenosine. What electrical therapy is appropriate?

Accepted Answer

Synchronized cardioversion at 50-100J

Answer

Unsynchronized defibrillation at 200J

Answer

Transcutaneous pacing at 80 bpm

Answer

Synchronized cardioversion at 360J

Question 7

What is the PRIMARY danger of delivering a defibrillation shock in asynchronized mode to a patient in atrial flutter?

Accepted Answer

Inducing ventricular fibrillation by shocking on the T wave

Answer

Skin burns at electrode sites

Answer

Failure to convert the rhythm

Answer

Excessive pain to the patient