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

Leads II, III, and aVF are the inferior leads; ST elevation in these leads indicates an inferior STEMI, typically from RCA occlusion.

Question 2

Ventricular fibrillation (VF) on an ECG appears as:

Accepted Answer

Completely chaotic, irregular waveforms with no identifiable QRS

Answer

VF produces chaotic, disorganized electrical activity with no identifiable QRS complexes, P waves, or T waves.

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

SVT presents as a regular narrow-complex tachycardia at 150–250 bpm; P waves are often buried in the preceding T wave.

Question 4

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

Accepted Answer

Valsalva maneuver or carotid sinus massage

Answer

Vagal maneuvers (Valsalva, carotid sinus massage) are the first-line treatment for stable SVT to slow conduction through the AV node.

Question 5

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

Accepted Answer

Complete dissociation of P waves and QRS complexes

Answer

Third-degree AV block shows complete dissociation — P waves and QRS complexes march independently at different rates.

PCP - Primary Care Paramedic Practice Test