PCT EKG Lead Placement & Rhythm Recognition 2

Question 1

In a standard 12-lead EKG, where is the V1 electrode placed?

Accepted Answer

Right side, 4th intercostal space at the sternal border

Answer

V1 is placed at the 4th intercostal space at the right sternal border, serving as the first precordial lead.

Question 2

What does a prolonged PR interval on an EKG tracing indicate?

Accepted Answer

A first-degree AV block

Answer

A PR interval longer than 0.20 seconds indicates delayed conduction through the AV node, which defines a first-degree AV block.

Question 3

Which EKG rhythm shows irregularly irregular R-R intervals with no identifiable P waves?

Accepted Answer

Atrial fibrillation

Answer

Atrial fibrillation is characterized by chaotic atrial activity producing no distinct P waves and completely irregular ventricular response.

Question 4

What is the correct color code for the right arm (RA) limb lead electrode?

Accepted Answer

White

Answer

In the standard American color code, white is placed on the right arm (remember: 'white is right').

Question 5

A patient's EKG shows a heart rate of 42 bpm with a regular rhythm and wide QRS complexes. This is MOST consistent with:

Accepted Answer

Ventricular escape rhythm

Answer

A rate of 20-40 bpm with wide QRS complexes indicates the ventricular pacemaker cells have taken over, producing a ventricular escape rhythm.

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