PCT EKG Basics 2

Question 1

Which EKG wave represents ventricular repolarization?

Accepted Answer

T wave

Answer

The T wave represents ventricular repolarization, when the ventricles reset electrically after contracting.

Question 2

In a standard 12-lead EKG, how many chest (precordial) leads are included?

Accepted Answer

6

Answer

A 12-lead EKG includes 6 limb leads (I, II, III, aVR, aVL, aVF) and 6 precordial leads (V1–V6).

Question 3

What does a prolonged QT interval indicate?

Accepted Answer

Increased risk of dangerous ventricular arrhythmias

Answer

A prolonged QT interval indicates delayed ventricular repolarization, which increases the risk of torsades de pointes and ventricular fibrillation.

Question 4

Where is lead V1 placed on the patient's chest?

Accepted Answer

Right 4th intercostal space, sternal border

Answer

V1 is placed at the 4th intercostal space along the right sternal border.

Question 5

A heart rate of 40 bpm on an EKG is classified as:

Accepted Answer

Bradycardia

Answer

Bradycardia is defined as a heart rate below 60 bpm; 40 bpm falls well below this threshold.

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