#1
Which of the following is a characteristic of sinus bradycardia?
Heart rate greater than 100 beats per minute
Regular rhythm with a rate less than 60 beats per minute
Irregular rhythm with a rate greater than 100 beats per minute
Absence of electrical activity in the heart
#2
What is the first-line treatment for stable supraventricular tachycardia?
Vagal maneuvers
Defibrillation
Cardioversion
CPR
#3
Which term describes an abnormally fast heart rate originating from the ventricles?
Atrial fibrillation
Ventricular tachycardia
Atrial flutter
Ventricular fibrillation
#4
Which of the following is a common symptom of atrial fibrillation?
Regular heart rhythm
Palpitations
Slow heart rate
Stable blood pressure
#5
Which condition is characterized by a rapid, regular heart rhythm originating from the atria?
Atrial fibrillation
Ventricular tachycardia
Supraventricular tachycardia
Ventricular fibrillation
#6
Which of the following medications is commonly used to terminate ventricular fibrillation?
Adenosine
Amiodarone
Atropine
Epinephrine
#7
What is the primary mechanism of action of beta-blockers in treating cardiac dysrhythmias?
Blocking calcium channels
Increasing potassium efflux
Blocking beta-adrenergic receptors
Inhibiting sodium-potassium ATPase
#8
Which electrolyte imbalance is associated with prolongation of the QT interval?
Hyperkalemia
Hypokalemia
Hypercalcemia
Hypocalcemia
#9
What is the primary pharmacological action of adenosine in the treatment of supraventricular tachycardia?
Beta-blockade
Calcium channel blockade
Slowing AV nodal conduction
Enhancing atrial contraction
#10
Which ECG finding is characteristic of Wolff-Parkinson-White syndrome?
Prolonged PR interval
Delta wave
Osborn wave
Peaked T wave
#11
Which medication is commonly used as an antidote for severe digoxin toxicity?
Atropine
Dobutamine
Digoxin immune fab
Naloxone
#12
Which cardiac dysrhythmia is characterized by chaotic and disorganized electrical activity in the ventricles?
Ventricular tachycardia
Ventricular fibrillation
Atrial fibrillation
Atrial flutter
#13
What is the most common cause of sudden cardiac arrest in young athletes?
Hypertrophic cardiomyopathy
Atrial fibrillation
Long QT syndrome
Atherosclerosis
#14
Which of the following is a potential complication of synchronized cardioversion?
Ventricular fibrillation
Pacemaker malfunction
Pulmonary embolism
Asystole
#15
Which electrolyte imbalance can precipitate torsades de pointes?
Hypomagnesemia
Hypernatremia
Hypocalcemia
Hyperkalemia
#16
What is the typical QRS morphology seen in ventricular fibrillation on an ECG?
Regular narrow complexes
Irregular broad complexes
Absence of QRS complexes
Regular broad complexes
#17
Which type of heart block is characterized by progressively prolonged PR intervals until a QRS complex is dropped?
First-degree AV block
Second-degree AV block, Mobitz type I (Wenckebach)
Second-degree AV block, Mobitz type II
Third-degree AV block