Cardiac Mastery Quiz

What is the correct sequence of the cardiac conduction system?

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

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

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

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

How is heart rate typically assessed on an EKG?

• By measuring the distance between two QRS complexes

• By counting the number of QRS complexes in a 6-second strip and multiplying by 10

• By measuring the distance between two P waves

• By counting the number of T waves in a 30-second strip

Which part of the EKG waveform represents ventricular depolarization?

• P wave

• QRS complex

• T wave

• U wave

What does a prolonged PR interval on an EKG suggest?

• Ventricular tachycardia

• Atrial fibrillation

• First-degree heart block

• Premature ventricular contraction

Which of the following is NOT a characteristic of normal sinus rhythm on an EKG?

• Regular R-R intervals

• A P wave preceding each QRS complex

• QRS duration less than 0.12 seconds

• P waves inverted

What is the normal range for the PR interval on an EKG?

• 0.12 to 0.20 seconds

• 0.20 to 0.40 seconds

• 0.05 to 0.10 seconds

• 0.01 to 0.08 seconds

Which type of arrhythmia is characterized by a sawtooth pattern on an EKG?

• Ventricular fibrillation

• Atrial flutter

• Atrial fibrillation

• Ventricular tachycardia

What does the QT interval represent on an EKG?

• Time between the start of the Q wave and the end of the T wave, representing the entire electrical depolarization and repolarization of the ventricles

• Time between the start of the P wave and the start of the QRS complex, representing atrial depolarization

• Time between the end of the T wave and the start of the next P wave, representing the heart's resting phase

• Time between two successive QRS complexes, representing the heart rate

Which condition is often associated with a "delta wave" on an EKG?

• Wolff-Parkinson-White Syndrome

• Long QT Syndrome

• Brugada Syndrome

• Ventricular fibrillation

What is the significance of an inverted T wave on an EKG?

• It is a normal variant in children and some adults.

• It may indicate myocardial ischemia.

• It signifies rapid heart rate.

• It is indicative of atrial fibrillation.