EKG certification Certification EKG Interpretation & Waveforms 3

Question 1

A patient's EKG shows a regular narrow-complex tachycardia at 150 bpm with a sawtooth pattern in leads II, III, and aVF. What is the MOST likely rhythm?

Accepted Answer

Atrial flutter with 2:1 block

Answer

Sinus tachycardia

Answer

Atrial fibrillation

Answer

Supraventricular tachycardia

Question 2

Which EKG finding differentiates ventricular tachycardia from supraventricular tachycardia with aberrant conduction?

Accepted Answer

Presence of AV dissociation

Answer

Heart rate above 150 bpm

Answer

Narrow QRS complexes

Answer

Regular R-R intervals

Question 3

In a second-degree AV block Type II (Mobitz II), what is the expected pattern of PR intervals before a dropped QRS?

Accepted Answer

Constant PR intervals with sudden dropped QRS

Answer

Progressively lengthening PR intervals

Answer

Absent P waves throughout

Answer

Variable PR intervals with irregular rhythm

Question 4

An EKG shows ST elevation in leads V1-V4 with reciprocal ST depression in leads II, III, and aVF. Which coronary artery is MOST likely occluded?

Accepted Answer

Left anterior descending artery

Answer

Right coronary artery

Answer

Left circumflex artery

Answer

Posterior descending artery

Question 5

What is the significance of pathological Q waves on an EKG?

Accepted Answer

They represent prior myocardial infarction with transmural necrosis

Answer

They indicate active ischemia requiring immediate intervention

Answer

They are a normal variant seen in young athletes

Answer

They signify an electrolyte imbalance

Question 6

A patient on digoxin therapy presents with an EKG showing a downsloping ST segment with a scooped appearance. What does this finding represent?

Accepted Answer

Digitalis effect, which is an expected pharmacologic change

Answer

Acute myocardial ischemia requiring emergent catheterization

Answer

Hyperkalemia requiring immediate potassium correction

Answer

Left bundle branch block