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Cardiac Arrhythmias and Conduction System Quiz

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Which of the following is a characteristic of sinus rhythm?

Regular rhythm with P wave preceding each QRS complex

Explanation

Normal heart rhythm with P waves before QRS complexes

Which ECG lead is commonly used to diagnose inferior wall myocardial infarction?

Lead III

Explanation

Lead focused on inferior heart regions

Which of the following is NOT a risk factor for the development of atrial fibrillation?

Bradycardia

Explanation

Slow heart rate not associated with atrial fibrillation

What is the typical heart rate range in patients with atrial fibrillation?

100-150 bpm

Explanation

Fast, irregular heart rate between 100 and 150 beats per minute

Which arrhythmia is characterized by sudden onset and offset, typically lasting less than 30 seconds?

Paroxysmal supraventricular tachycardia

Explanation

Sudden fast heart rate episodes

A patient presents with a regular rhythm of 150 bpm, absent P waves, and narrow QRS complexes. What arrhythmia is most likely?

Supraventricular tachycardia

Explanation

Fast heart rate originating above ventricles

What is the mechanism of action of Class III antiarrhythmic drugs?

Prolonging action potential duration by blocking potassium channels

Explanation

Lengthens heart muscle's electrical activity

Which electrolyte imbalance is commonly associated with the development of torsades de pointes?

Hypomagnesemia

Explanation

Low magnesium levels affecting heart rhythm

In which type of heart block does the PR interval progressively lengthen until a QRS complex is dropped?

Second-degree AV block, type I (Wenckebach)

Explanation

PR interval gradually lengthens until QRS is missed

#10

What is the treatment of choice for a patient with stable monomorphic ventricular tachycardia?

Amiodarone or lidocaine

Explanation

Medications to stabilize fast, regular ventricular rhythm

#11

Which of the following ECG findings is characteristic of ventricular fibrillation?

Chaotic, irregular rhythm without discernible QRS complexes

Explanation

Unorganized electrical activity in the heart's ventricles

#12

Which arrhythmia is characterized by an absence of both P waves and QRS complexes?

Asystole

Explanation

Complete absence of heart electrical activity

#13

What is the hallmark characteristic of Mobitz II (Second-degree AV block, type II)?

Fixed PR interval with occasional dropped QRS complexes

Explanation

Stable PR interval with intermittent missed QRS

#14

What is the primary mechanism of action of adenosine in the treatment of supraventricular tachycardia?

Inhibition of AV node conduction

Explanation

Slows electrical signals in heart's AV node

#15

Which medication is contraindicated in patients with atrial fibrillation and Wolff-Parkinson-White syndrome due to risk of ventricular fibrillation?

Verapamil

Explanation

Drug not recommended due to severe complication risk

Cardiac Arrhythmias and Conduction System Quiz

Which of the following is a characteristic of sinus rhythm?

Which ECG lead is commonly used to diagnose inferior wall myocardial infarction?

Which of the following is NOT a risk factor for the development of atrial fibrillation?

What is the typical heart rate range in patients with atrial fibrillation?

Which arrhythmia is characterized by sudden onset and offset, typically lasting less than 30 seconds?

A patient presents with a regular rhythm of 150 bpm, absent P waves, and narrow QRS complexes. What arrhythmia is most likely?

What is the mechanism of action of Class III antiarrhythmic drugs?

Which electrolyte imbalance is commonly associated with the development of torsades de pointes?

In which type of heart block does the PR interval progressively lengthen until a QRS complex is dropped?

What is the treatment of choice for a patient with stable monomorphic ventricular tachycardia?

Which of the following ECG findings is characteristic of ventricular fibrillation?

Which arrhythmia is characterized by an absence of both P waves and QRS complexes?

What is the hallmark characteristic of Mobitz II (Second-degree AV block, type II)?

What is the primary mechanism of action of adenosine in the treatment of supraventricular tachycardia?

Which medication is contraindicated in patients with atrial fibrillation and Wolff-Parkinson-White syndrome due to risk of ventricular fibrillation?

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