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A 18-year-old female asked:

Automatic atrial tachycardia with exercise? how do you differentiate from innapropriate sinus tachycardia? which would be more likely in an athlete?

1 doctor answer8 doctors weighed in
Dr. Mark Landers
Cardiology - Cardiac Electrophysiology 32 years experience
Tachycardia: Inappropriate sinus tachycardia - elevated heart rate (HR) at rest > 100 sitting/standing. Athletes usually have a slow HR at rest. Atrial tachycardia/fibrillation/flutter with excessive HR more common in extreme athletes with exercise. Cause unclear - may be due to electrical changes from extreme endurance exercise to atrial electrical properties of the heart. More exercise not always better.
Last updated Oct 23, 2017

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