Beat Reading Heart Beat Reading 3

Question 1

Which of the following is the correct sequence of normal cardiac electrical conduction?

Accepted Answer

SA node → AV node → Bundle of His → Bundle branches → Purkinje fibers

Answer

Normal conduction travels from the SA node to the AV node, then through the Bundle of His, bundle branches, and finally the Purkinje fibers.

Question 2

Saw-tooth flutter waves at approximately 300 bpm with regular ventricular response of 75 bpm suggests:

Accepted Answer

Atrial flutter with 4:1 conduction

Answer

Classic atrial flutter has atrial rates around 300 bpm; a ventricular rate of 75 bpm reflects 4:1 AV conduction ratio.

Question 3

A patient develops sudden wide-complex tachycardia at 180 bpm after an MI. The MOST dangerous rhythm to rule out is:

Accepted Answer

Ventricular tachycardia

Answer

Ventricular tachycardia is life-threatening and must be ruled out first when wide-complex tachycardia occurs post-MI.

Question 4

On an ECG, the isoelectric line between the S wave and T wave is called the:

Accepted Answer

ST segment

Answer

The ST segment is the flat section between the end of the S wave and the beginning of the T wave, and its elevation or depression indicates ischemia or injury.

Question 5

Which lead is considered the best single lead for detecting P waves?

Accepted Answer

Lead II

Answer

Lead II is typically the best lead for visualizing P waves because electrical activity flows toward its positive electrode in normal sinus rhythm.

Beat Reading Practice Test

Beat Reading Practice Test

Beat Reading Heart Beat Reading 3