#1
Which of the following is a normal sinus rhythm?
Atrial fibrillation
Ventricular tachycardia
Sinus bradycardia
Premature ventricular contractions
#2
What is the normal range for the PR interval on an ECG?
0.04 to 0.10 seconds
0.12 to 0.20 seconds
0.20 to 0.40 seconds
0.40 to 0.60 seconds
#3
What does the T wave represent on an ECG?
Ventricular depolarization
Atrial depolarization
Ventricular repolarization
Atrial repolarization
#4
What is the term for the delay between atrial depolarization and ventricular depolarization on an ECG?
PR interval
QRS complex
QT interval
ST segment
#5
What does the ST segment represent on an ECG?
Ventricular depolarization
Atrial depolarization
Ventricular repolarization
Atrial repolarization
#6
What is the term for the sequence of electrical activation and recovery of the myocardium?
Repolarization
Depolarization
Conduction
Reentry
#7
What is the electrical axis of the heart indicative of?
Atrioventricular (AV) node conduction time
Rate of depolarization of the sinoatrial (SA) node
Orientation of the heart's electrical activity
Heart rate variability
#8
Which ECG lead placement is used to view the inferior wall of the heart?
#9
Which ECG lead placement is used to view the lateral wall of the heart?
V1
II, III, aVF
V5, V6
Lead I, aVL, V5, V6
#10
In which cardiac rhythm does the heart's electrical activity originate from multiple ectopic foci rather than the sinoatrial node?
Sinus rhythm
Atrial flutter
Atrial fibrillation
Premature atrial contractions
#11
Which of the following is a characteristic of atrial fibrillation on an ECG?
Regular rhythm with absent P waves
Regular rhythm with normal P waves
Irregular rhythm with absent P waves
Irregular rhythm with normal P waves
#12
Which of the following arrhythmias typically presents with a sawtooth pattern on an ECG?
Ventricular fibrillation
Atrial fibrillation
Ventricular tachycardia
Atrial flutter
#13
What is the significance of the QT interval on an ECG?
Indicates atrial depolarization
Represents ventricular depolarization
Reflects ventricular repolarization
Measures atrial contraction time
#14
Which of the following arrhythmias is characterized by a wide QRS complex and absent P waves?
Sinus rhythm
Atrial fibrillation
Ventricular tachycardia
Supraventricular tachycardia
#15
Which condition is characterized by a prolonged QT interval on an ECG and can lead to sudden cardiac death?
Wolff-Parkinson-White syndrome
Ventricular fibrillation
Long QT syndrome
Atrial flutter
#16
What is the common cause of ventricular fibrillation?
Ischemic heart disease
Hypertension
Bradycardia
Atrial fibrillation
#17
Which electrolyte imbalance can lead to a prolonged QT interval on an ECG?
Hyperkalemia
Hypokalemia
Hypercalcemia
Hypocalcemia