#1
Which of the following is a common symptom of atrial fibrillation?
Regular and rhythmic heartbeat
Fluttering or rapid heartbeat
Slow heartbeat
Intermittent chest pain
#2
Which cardiac dysrhythmia is characterized by chaotic and irregular ventricular activity on ECG?
Atrial flutter
Ventricular fibrillation
Sinus tachycardia
Premature ventricular contraction
#3
Which electrolyte imbalance is associated with prolongation of the QT interval on ECG?
Hyperkalemia
Hypokalemia
Hypernatremia
Hypomagnesemia
#4
Which ECG finding is characteristic of atrial fibrillation?
Regular rhythm with absent P waves
Regular rhythm with wide QRS complexes
Regular rhythm with inverted T waves
Irregular rhythm with normal QRS complexes
#5
What is the most common type of heart block?
First-degree heart block
Second-degree heart block
Third-degree heart block
Bundle branch block
#6
Which ECG finding is characteristic of ventricular tachycardia?
P waves absent
QRS complex widened
Regular rhythm
PR interval prolonged
#7
In Wolff-Parkinson-White syndrome, what abnormality is seen on ECG?
Prolonged QT interval
Delta wave
Absent P waves
Tall T waves
#8
Which of the following drugs is commonly used for rate control in atrial fibrillation?
Digoxin
Amiodarone
Flecainide
Adenosine
#9
Which of the following is a common cause of second-degree heart block?
Myocardial infarction
Hyperkalemia
Hypokalemia
Digoxin toxicity
#10
What is the hallmark ECG finding in atrioventricular nodal reentrant tachycardia (AVNRT)?
Absence of P waves
Short PR interval
Long QT interval
Sawtooth pattern
#11
What is the treatment of choice for symptomatic bradycardia?
Beta-blockers
Atropine
Cardioversion
Calcium channel blockers
#12
What is the primary mechanism of action of amiodarone in treating cardiac dysrhythmias?
Blocks potassium channels
Blocks calcium channels
Prolongs refractory period
Increases sodium influx
#13
What is the mechanism of action of beta-blockers in managing cardiac dysrhythmias?
Prolongs action potential duration
Blocks calcium channels
Increases sympathetic tone
Reduces automaticity of nodal tissue
#14
Which electrolyte imbalance can precipitate torsades de pointes?
Hypercalcemia
Hypomagnesemia
Hyperkalemia
Hypophosphatemia
#15
Which condition is associated with a shortened QT interval on ECG?
Wolff-Parkinson-White syndrome
Long QT syndrome
Brugada syndrome
Torsades de pointes