Which disorders can cause an extra beat that often originates from a source other than the SA node? (Select all that apply.) Note: Credit will be given only if all correct choices and no incorrect choices are selected
1. Ventricular fibrillation
2. Premature ventricular contraction
3. Premature atrial contraction
4. Atrial fibrillation
5. Cardiogenic shock
Correct Answer: 2, 3
Rationale 1: Fibrillation is characterized by very rapid, uncoordinated beats.
Rationale 2: Premature ventricular contraction originates in the ventricles.
Rationale 3: Premature atrial contraction originates in the atria.
Rationale 4: Fibrillation is characterized by very rapid, uncoordinated beats.
Rationale 5: Cardiogenic shock does not cause an extra heart beat.
Global Rationale: Premature ventricular contraction originates in the ventricles. Premature atrial contraction originates in the atria. Fibrillation is characterized by very rapid, uncoordinated beats. Cardiogenic shock does not cause an extra heart beat.
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