EKG certification Certification FREE EKG Certification General Question and Answers 3

Question 1

In a 12-lead EKG, which leads view the lateral wall of the heart?

Accepted Answer

I, aVL, V5, V6

Answer

Leads I, aVL, V5, and V6 are positioned to view the lateral wall of the left ventricle.

Question 2

What is the significance of a QRS complex duration greater than 0.12 seconds?

Accepted Answer

Possible bundle branch block

Answer

A widened QRS complex exceeding 0.12 seconds suggests abnormal ventricular conduction, most commonly a bundle branch block.

Question 3

How many small boxes on standard EKG paper equal 1 millivolt of amplitude?

Accepted Answer

10 small boxes

Answer

At standard calibration of 10 mm/mV, 1 millivolt equals 10 small boxes or 2 large boxes in height.

Question 4

Which EKG finding is characteristic of atrial fibrillation?

Accepted Answer

Irregularly irregular R-R intervals with absent P waves

Answer

Atrial fibrillation is identified by an irregularly irregular ventricular rhythm with no discernible P waves replaced by fibrillatory waves.

Question 5

Where should the V4 precordial lead be placed on the patient's chest?

Accepted Answer

Left midclavicular line, 5th intercostal space

Answer

V4 is placed at the left midclavicular line in the 5th intercostal space, serving as the anchor point for V5 and V6 placement.

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