TMT U2 Exam Prep

What is the normal range for the PR interval?

• 0.08–0.12 seconds
• 0.12–0.20 seconds
• 0.20–0.24 seconds
• 0.04–0.10 seconds
• 0.10–0.14 seconds

Answer explanation

Normal PR interval is between 0.12 and 0.20 seconds.

What is considered a prolonged QT interval for a male patient?

• >0.40 seconds
• >0.42 seconds
• >0.45 seconds
• >0.48 seconds
• >0.50 seconds

Answer explanation

For men, a QT interval >0.45 seconds is considered prolonged.

What is the significance of measuring the ST segment on an EKG?

• It helps in diagnosing atrial enlargement.

• It is crucial for identifying ventricular hypertrophy.

• It is indicative of the heart's rhythm and pace.

• It is important for diagnosing ischemia or infarction.

A prolonged QT interval is a normal finding.

• True

• False

Do the P–P intervals vary in atrial rhythms?

• Always

• Never

• Sometimes

What rhythm mechanism involves a heart rate over 100 bpm?

• Bradycardia
• Tachycardia
• Escape Rhythm
• Normal Rate
• Block

Answer explanation

Tachycardia is defined by a heart rate over 100 bpm.

Which rhythm origin typically has normal P waves before each QRS and a regular rhythm?

• Atrial
• Sinus
• Junctional
• Ventricular
• Escape

Answer explanation

Sinus rhythms have normal P waves before each QRS and are regular.

Which mechanism involves a new rhythm starting after a pause?

• Bradycardia
• Tachycardia
• Escape Rhythm
• Normal Rate
• Block

Answer explanation

Escape rhythm begins after a pause due to failure of the dominant pacemaker.

Which rhythm origin typically presents with a narrow QRS and no visible P waves?

• Ventricular
• Junctional
• Sinus
• Atrial
• Escape

Answer explanation

Junctional rhythms often have absent or inverted P waves and narrow QRS complexes.

What is the purpose of evaluating the ST segment during rhythm interpretation?

• To evaluate the ST segment for elevation or depression and compare its level to the TP segment (baseline).

• To determine the heart rate by counting the number of ST segments.

• To identify the presence of P waves in the ECG tracing.

• To measure the duration of the QRS complex.