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Cardiovascular Electrophysiology Quiz

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What is the main function of the sinoatrial (SA) node in the heart?

Initiation of the cardiac action potential

Explanation

SA node generates electrical impulses, triggering heart contraction.

What is the normal resting heart rate for adults in beats per minute (bpm)?

60-80 bpm

Explanation

Normal adult resting heart rate falls between 60-80 beats per minute.

Which ion plays a key role in depolarization during the action potential of cardiac cells?

Sodium (Na+)

Explanation

Sodium influx initiates depolarization by rapidly changing the membrane potential.

Which ECG wave corresponds to the depolarization of the ventricles in the heart?

QRS complex

Explanation

QRS complex indicates ventricular depolarization on an ECG.

Which part of the cardiac conduction system is responsible for delaying the impulse to allow the atria to contract before the ventricles?

Atrioventricular (AV) node

Explanation

AV node delays impulse transmission, ensuring sequential contraction.

Which phase of the cardiac action potential corresponds to the rapid influx of sodium ions into the cell?

Phase 0

Explanation

Phase 0 involves rapid depolarization due to sodium influx.

What is the term for the condition where the heart is unable to pump blood effectively, leading to inadequate circulation?

Heart failure

Explanation

Heart failure results in inadequate blood circulation due to impaired pumping.

What is the term for an abnormal heart rhythm characterized by rapid, irregular contractions of the atria?

Atrial fibrillation

Explanation

Atrial fibrillation presents rapid, irregular atrial contractions.

What is the primary function of the atrioventricular (AV) bundle (Bundle of His) in the cardiac conduction system?

Delayed transmission of impulses

Explanation

AV bundle ensures sequential contraction by delaying impulse transmission.

#10

Which electrolyte imbalance can lead to a prolonged QT interval on the ECG and increase the risk of arrhythmias?

Hypokalemia

Explanation

Hypokalemia prolongs QT interval, raising arrhythmia risk.

#11

Which antiarrhythmic medication primarily blocks sodium channels and is often used to treat ventricular arrhythmias?

Lidocaine

Explanation

Lidocaine blocks sodium channels, treating ventricular arrhythmias.

#12

What is the term for the condition where there is a complete cessation of heart electrical activity and mechanical function?

Cardiac arrest

Explanation

Cardiac arrest signifies the complete halt of heart activity.

Cardiovascular Electrophysiology Quiz

What is the main function of the sinoatrial (SA) node in the heart?

What is the normal resting heart rate for adults in beats per minute (bpm)?

Which ion plays a key role in depolarization during the action potential of cardiac cells?

Which ECG wave corresponds to the depolarization of the ventricles in the heart?

Which part of the cardiac conduction system is responsible for delaying the impulse to allow the atria to contract before the ventricles?

Which phase of the cardiac action potential corresponds to the rapid influx of sodium ions into the cell?

What is the term for the condition where the heart is unable to pump blood effectively, leading to inadequate circulation?

What is the term for an abnormal heart rhythm characterized by rapid, irregular contractions of the atria?

What is the primary function of the atrioventricular (AV) bundle (Bundle of His) in the cardiac conduction system?

Which electrolyte imbalance can lead to a prolonged QT interval on the ECG and increase the risk of arrhythmias?

Which antiarrhythmic medication primarily blocks sodium channels and is often used to treat ventricular arrhythmias?

What is the term for the condition where there is a complete cessation of heart electrical activity and mechanical function?

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