Understanding Electrocardiography Basics

What is the name of the first upward deflection in a normal ECG waveform?

• T wave

• P wave

• Q wave

• S wave

Which part of the ECG waveform represents ventricular depolarization?

• P wave

• QRS complex

• T wave

• U wave

How is heart rate calculated from an ECG strip?

• Count the number of P waves in 10 seconds

• Count the number of QRS complexes in 6 seconds and multiply by 10

• Count the number of T waves in 15 seconds

• Count the number of QRS complexes in 10 seconds and multiply by 6

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

• 0.12 to 0.20 seconds

• 0.08 to 0.10 seconds

• 0.20 to 0.30 seconds

• 0.10 to 0.12 seconds

Which arrhythmia is characterized by an irregularly irregular rhythm with no distinct P waves?

• Atrial flutter

• Atrial fibrillation

• Ventricular tachycardia

• Sinus bradycardia

What is the normal duration of the QRS complex?

• 0.06 to 0.10 seconds

• 0.12 to 0.20 seconds

• 0.20 to 0.30 seconds

• 0.10 to 0.12 seconds

Which ECG waveform component represents atrial depolarization?

• QRS complex

• T wave

• P wave

• U wave

What is the normal range for the QT interval on an ECG?

• 0.20 to 0.40 seconds

• 0.30 to 0.50 seconds

• 0.35 to 0.45 seconds

• 0.40 to 0.60 seconds

Which arrhythmia is characterized by a sawtooth pattern on the ECG?

• Atrial fibrillation

• Atrial flutter

• Ventricular fibrillation

• Sinus tachycardia

What is the significance of the ST segment on an ECG?

• Atrial depolarization

• Ventricular depolarization

• Ventricular repolarization

• Time between ventricular depolarization and repolarization