PCP Cardiac Care and ECG

Question 1

On a 12-lead ECG, ST-segment elevation in leads II, III, and aVF suggests an infarction in which territory?

Accepted Answer

Inferior wall

Answer

Anterior wall

Answer

Lateral wall

Answer

Posterior wall

Question 2

Ventricular fibrillation (VF) on an ECG appears as:

Accepted Answer

Completely chaotic, irregular waveforms with no identifiable QRS

Answer

Regular narrow QRS complexes at 150 bpm

Answer

Wide-complex regular tachycardia at 180 bpm

Answer

Saw-tooth flutter waves at 300 bpm

Question 3

Which rhythm is characterized by a regular narrow-complex tachycardia at 150–250 bpm with no visible P waves?

Accepted Answer

Supraventricular tachycardia (SVT)

Answer

Atrial flutter

Answer

Sinus tachycardia

Answer

Ventricular tachycardia

Question 4

The first-line treatment for stable narrow-complex SVT is:

Accepted Answer

Valsalva maneuver or carotid sinus massage

Answer

Synchronized cardioversion at 100 J

Answer

Amiodarone IV

Answer

Defibrillation at 200 J

Question 5

A patient in third-degree (complete) heart block will show:

Accepted Answer

Complete dissociation of P waves and QRS complexes

Answer

Progressively lengthening PR interval then a dropped beat

Answer

Consistent PR prolongation >0.20 seconds

Answer

Absent P waves with irregular QRS

Question 6

Which of the following is the correct joule setting for synchronized cardioversion of an unstable narrow-complex tachycardia?

Accepted Answer

50–100 J biphasic

Answer

200 J biphasic

Answer

360 J monophasic only

Answer

1 J/kg