#1
Which of the following is a characteristic of sinus rhythm on an electrocardiogram (ECG)?
Regular rhythm with a heart rate between 60 to 100 bpm
Irregular rhythm with a heart rate above 100 bpm
Regular rhythm with a heart rate above 100 bpm
Irregular rhythm with a heart rate between 60 to 100 bpm
#2
What does the P wave represent on an ECG?
Atrial depolarization
Ventricular repolarization
Atrial repolarization
Ventricular depolarization
#3
What is the term for the delay between atrial and ventricular depolarization in the ECG?
PR interval
QT interval
QRS complex
ST segment
#4
Which of the following is a common symptom of ventricular fibrillation?
Chest pain
Palpitations
Loss of consciousness
Shortness of breath
#5
Which of the following arrhythmias is characterized by a rapid, irregular heart rate?
Atrial fibrillation
Sinus bradycardia
Ventricular tachycardia
Sinus rhythm
#6
What is the QT interval on an ECG used to assess?
Ventricular repolarization time
Atrial depolarization time
Ventricular depolarization time
Atrial repolarization time
#7
What is the most common cause of atrial fibrillation?
Coronary artery disease
Hypertension
Hyperthyroidism
Valvular heart disease
#8
Which ECG lead placement is most commonly used to diagnose myocardial infarction?
Lead I, II, III
Lead V1, V2, V3
Lead V3R, V4R, V5R
Lead V1, V2, V3, V4, V5, V6
#9
Which of the following drugs is used to treat ventricular tachycardia?
Atropine
Amiodarone
Adenosine
Digoxin
#10
Which of the following is a life-threatening arrhythmia characterized by chaotic, irregular ventricular activity?
Ventricular fibrillation
Atrial flutter
Premature ventricular contractions
Atrial fibrillation
#11
What is the primary goal of treating ventricular fibrillation?
Restore normal sinus rhythm
Reduce ventricular ectopic activity
Decrease heart rate
Prevent thromboembolism
#12
Which electrolyte imbalance is associated with a prolonged QT interval?
Hyperkalemia
Hypokalemia
Hypercalcemia
Hypocalcemia
#13
Which of the following medications can precipitate torsades de pointes, a form of polymorphic ventricular tachycardia?
Atenolol
Digoxin
Amiodarone
Quinidine
#14
Which of the following ECG abnormalities is indicative of left ventricular hypertrophy?
Prolonged PR interval
Peaked T waves
Left axis deviation
Increased R wave amplitude in lead V5 and V6