Exploring Cardiac Arrhythmias and ECG Interpretation

What is the normal heart rate set by the SA node?

• 50 to 90 beats per minute

• 60 to 100 beats per minute

• 70 to 110 beats per minute

• 80 to 120 beats per minute

Tags

NGSS.HS-LS1-3

What condition is characterized by a heart rate less than 60 beats per minute?

• Ventricular tachycardia

• Sinus bradycardia

• Atrial fibrillation

• Sinus tachycardia

Which arrhythmia is caused by an electrical impulse traveling in a loop within the atria?

• AV nodal re-entrant tachycardia

• Sinus bradycardia

• Atrial fibrillation

• Atrial flutter

Which arrhythmia is characterized by an absence of normal P waves and presence of flutter waves?

• Atrial fibrillation

• Atrial flutter

• Sinus bradycardia

• Ventricular tachycardia

What is the characteristic ECG finding in atrial fibrillation?

• Regular P waves

• Absence of P waves and irregular QRS complexes

• Wide and bizarre QRS complexes

• Saw-tooth flutter waves

What is the heart rate range for AV nodal re-entrant tachycardia?

• 50 to 150 beats per minute

• 100 to 200 beats per minute

• 200 to 300 beats per minute

• 150 to 250 beats per minute

Which condition is known as a lethal rhythm?

• Atrial fibrillation

• AV nodal re-entrant tachycardia

• Sinus tachycardia

• Ventricular tachycardia

What is the typical cause of ventricular tachycardia?

• Electrical impulse traveling in a loop

• Multiple weak ectopic sites in the ventricles

• A small re-entrant pathway involving the AV node

• A single strong firing site in one of the ventricles

What is the main characteristic of ventricular fibrillation on an ECG?

• Narrow QRS complexes

• Saw-tooth flutter waves

• Regular P waves

• Irregular random waveforms of varying amplitude

What is the result of ventricular fibrillation?

• Increased heart rate

• Decreased blood pressure

• The heart pumps little or no blood

• Regular heart rhythm