A person with a heart rate of 170 bpm and a normal QRS duration would most likely be experiencing a
1. yachydysrhythmia originating from the bundle branches.
2. tachydysrhythmia originating from the atria.
3. tachydysrhythmia originating from the ventricles.
4. tachydysrhythmia originating from the Purkinje fibers.
Correct Answer: 2
Rationale: Given a normal QRS duration, the rhythm is not coming from the ventricles but from the atria.
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