#1
Which of the following is a common symptom of atrial fibrillation?
Palpitations
ExplanationSensation of rapid, irregular, or pounding heartbeat
#2
What is the term for an abnormal fast heart rhythm originating above the ventricles?
Supraventricular tachycardia
ExplanationRapid heart rhythm involving atria or AV node
#3
What is the term for an abnormal heart rhythm originating below the atria?
Supraventricular tachycardia
ExplanationRapid heart rhythm originating above the ventricles
#4
What is the term for an abnormally slow heart rate?
Bradycardia
ExplanationHeart rate below 60 beats per minute
#5
Which electrolyte imbalance is commonly associated with the development of ventricular dysrhythmias?
Hyperkalemia
ExplanationHigh levels of potassium in the blood
#6
In the context of cardiac dysrhythmias, what does the term 'QT interval' represent?
Time between ventricular depolarization and repolarization
ExplanationTime taken for ventricular muscle cells to depolarize and repolarize
#7
What is the primary goal of treatment in a patient with atrial flutter?
Rhythm control
ExplanationRestoration of sinus rhythm or control of ventricular rate
#8
Which of the following is a potential complication of untreated atrial fibrillation?
Thromboembolism
ExplanationFormation of blood clots in the atria leading to embolism
#9
What is the term for a brief episode of rapid, regular heartbeats that spontaneously resolves?
Paroxysmal supraventricular tachycardia (PSVT)
ExplanationSudden onset and termination of SVT
#10
What is the first-line drug of choice for the acute termination of supraventricular tachycardia (SVT)?
Adenosine
ExplanationSlows conduction through the AV node, terminating SVT
#11
Which ECG lead is commonly used to monitor the electrical activity of the heart in the lateral wall?
Lead aVL
ExplanationProvides a view of the lateral wall of the left ventricle
#12
Which of the following is a characteristic of ventricular fibrillation?
No discernible rhythm
ExplanationChaotic, uncoordinated electrical activity in the ventricles
#13
Which medication is commonly used for rhythm control in atrial fibrillation?
Amiodarone
ExplanationDelays repolarization and prolongs the action potential duration
#14
What is the primary mechanism of action of beta-blockers in managing cardiac dysrhythmias?
Block beta-adrenergic receptors
ExplanationReduces heart rate and myocardial contractility
#15
Which ECG finding is characteristic of third-degree heart block?
Absence of P waves
ExplanationComplete dissociation between atria and ventricles