#1
Which of the following is a characteristic of sinus rhythm?
Regular rhythm with a rate between 60-100 beats per minute
ExplanationNormal heart rhythm with appropriate rate.
#2
What is the most common sustained arrhythmia?
Atrial fibrillation
ExplanationMost prevalent long-term irregular heart rhythm.
#3
Which of the following is a potential complication of untreated atrial fibrillation?
Heart failure
ExplanationPotential outcome of uncontrolled irregular heart rhythm.
#4
What is the term for a heart rate below 60 beats per minute?
Bradycardia
ExplanationSlow heart rate below normal range.
#5
Which of the following is a common symptom of ventricular tachycardia?
Chest pain
ExplanationTypical discomfort associated with rapid ventricular rhythm.
#6
Which ECG finding is characteristic of atrial fibrillation?
Regularly irregular rhythm with absent P waves and irregularly spaced QRS complexes
ExplanationIrregular heart rhythm with absent atrial activity.
#7
What is the term for a condition where the heart's electrical impulses originate from an ectopic focus in the ventricles?
Ventricular tachycardia
ExplanationRapid heart rhythm originating in the ventricles.
#8
What is the term for a prolonged QT interval on an ECG?
Long QT syndrome
ExplanationCondition marked by delayed repolarization.
#9
What is the preferred treatment for ventricular fibrillation?
Defibrillation
ExplanationImmediate action to restore normal heart rhythm.
#10
Which electrolyte abnormality is associated with a widened QRS complex on an ECG?
Hyperkalemia
ExplanationExcess potassium levels affecting heart function.
#11
Which of the following medications is commonly used to terminate supraventricular tachycardias?
Adenosine
ExplanationFrequently used to halt fast heart rhythms.
#12
What is the primary action of calcium channel blockers in the treatment of dysrhythmias?
Decrease myocardial contractility
ExplanationReduction of heart muscle's force of contraction.
#13
Which of the following ECG findings is characteristic of ventricular fibrillation?
Irregular rhythm with absent P waves and chaotic QRS complexes
ExplanationChaos on ECG due to disorganized ventricular activity.
#14
Which of the following medications is commonly used to terminate ventricular tachycardia?
Lidocaine
ExplanationFrequently employed to stop rapid ventricular rhythm.
#15
What is the term for the sudden cessation of organized electrical activity in the heart resulting in loss of cardiac output?
Ventricular fibrillation
ExplanationChaotic ventricular activity causing cardiac arrest.