Which disorders can cause an extra beat that often originates from a source other than the SA node?(Select all that apply.)
1. Ventricular fibrillation
2. Premature ventricular contraction
3. Premature atrial contraction
4. Atrial fibrillation
5. Cardiogenic shock
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 heartbeat.
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 heartbeat.
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