ECG And Common Arrhythmias

Question 1

Which wave represents atrial depolarization?

Answer 1

P wave

Question 2

During which segment does atrial contraction happen?

Answer 2

PR

Question 3

What represents ventricular depolarization?

Answer 3

QRS complex

Question 4

How does body habitus and muscle thickness influence QRS amplitude?

Answer 4

Increased muscle thickness = increased amplitude
Increased body mass = decreased amplitude

Question 5

When do the ventricles start to contract?

Answer 5

ST segment

Question 6

What does ST segment depression indicate?

Answer 6

Ischemia

Question 7

What does ST segment elevation indicate?

Answer 7

MI

Question 8

What happens to QRS when there is a right or left bundle branch block?

Answer 8

Gets wider

Question 9

What does the T wave represent (2)

Answer 9

1. Ventricular repolarization - electrically
2. Ventricular systole - mechanically

Question 10

When atrial muscle tissue produces its own impulse leading to atrial contraction followed by ventricular contraction

Answer 10

Premature atrial contraction

Question 11

Abnormal atrial contraction that is semi-organized so P waves look like normal P waves. More P waves for every QRS

Answer 11

Atrial flutter

Question 12

Very disorganized atrial contraction with no defined P waves

Answer 12

A-fib

Question 13

These can occur in 2’s 3’s or 4’s

Answer 13

Multiple PVCs

Question 14

Very rapid but coordinated ventricular beats

Answer 14

Ventricular tachycardia

Question 15

What are ventricular arrhythmias usually caused by?

Answer 15

MI

Question 16

Very rapid, not coordinated ventricular beats

Answer 16

Ventricular fibrillation

Question 17

Which arrhythmia is known to have a regular heart rate and rhythm but the P wave starts >20 ms before each QRS complex?

Answer 17

1st degree AV block

Question 18

Which arrhythmia is commonly associated with congestive heart failure?

Answer 18

A-fib