ECG module 5

Question 1

Which term describes the physiological increase and decrease of the heart rate during the various phases of respiration, manifesting as varying R-R intervals or an irregular rhythm?
A) Sinus arrhythmia
B) Sinus bradycardia
C) Sinus tachycardia
D) Atrial fibrillation

Answer 1

A) Sinus arrhythmia

Question 2

What is the term for pacemaker cells that exist elsewhere in the heart and can take over as the main cardiac pacemaker when the SA node fails to depolarize?
A) Backup pacemakers
B) Ectopic pacemakers
C) Reentry circuits
D) AV nodal pacemakers

Answer 2

A) Backup pacemakers

Question 3

Which condition arises when an impulse travels down one pathway and up another in a circuit pathway, involving two pathways with differing conduction velocities within the AV node?
A) Junctional rhythm
B) Atrial fibrillation
C) AV nodal reentry tachycardia (AVNRT)
D) Atrial flutter

Answer 3

C) AV nodal reentry tachycardia (AVNRT)

Question 4

In which type of tachycardia do atrial wavelets create irregularly-shaped ‘squiggles’ on the isoelectric line of the ECG?
A) Atrial tachycardia (AT)
B) Multifocal atrial tachycardia (MAT)
C) Atrial flutter (Af)
D) Atrial fibrillation (Afib)

Answer 4

D) Atrial fibrillation (Afib)

Question 5

Which type of tachyarrhythmia is characterized by a very fast rate (>120/min), regular narrow QRS, and may self-terminate, sustain, or deteriorate into ventricular fibrillation?
A) Ventricular tachycardia (VT)
B) Atrial fibrillation (Afib)
C) Supraventricular tachycardia (SVT)
D) Atrial flutter (Af)

Answer 5

A) Ventricular tachycardia (VT)

Question 6

In the context of ECG interpretation, what is the term for the phenomenon where an impulse conducts down one pathway and up another, creating a circuit pathway, often involving an accessory excitation bundle separate from the AV node?
A) Reentry mechanism
B) Backup pacemakers
C) Ectopic beats
D) Sinus arrhythmia

Answer 6

A) Reentry mechanism

Question 7

What type of arrhythmia is characterized by a slow rate (15-40b/m), regular rhythm, and QRS complexes that are wider than normal, often occurring due to a 3rd-degree block at the AV node or Bundle of His?
A) Junctional rhythm
B) Ventricular fibrillation
C) Atrial flutter
D) Atrial fibrillation

Answer 7

A) Junctional rhythm

Question 8

Which term describes a tachyarrhythmia with a regular narrow QRS complex, a very fast rate (>200/min), and is likely to respond well to vagal maneuvers?
A) Atrial flutter
B) Ventricular tachycardia
C) AV nodal reentry tachycardia (AVNRT)
D) Atrial tachycardia (AT)

Answer 8

C) AV nodal reentry tachycardia (AVNRT)

Question 9

What is the term for a fast, regular wide QRS rhythm that may resemble ventricular tachycardia but can be differentiated by distinct patterns such as LBBB or RBBB?
A) Supraventricular tachycardia (SVT)
B) Atrial fibrillation (Afib)
C) Ventricular fibrillation (Vfib)
D) Polymorphic ventricular tachycardia (P-VT)

Answer 9

A) Supraventricular tachycardia (SVT)

Question 10

Which type of arrhythmia is characterized by irregularly irregular narrow QRS complexes and the presence of irregularly-shaped ‘squiggles’ on the isoelectric line?
A) Junctional rhythm
B) Atrial flutter
C) Atrial fibrillation (Afib)
D) Supraventricular tachycardia (SVT)

Answer 10

C) Atrial fibrillation (Afib)