Lyn is right on.
Short run of SVT (Supra ventricular tachycardia) is an episode of extra beats in a row. If it comes very occasionally and there are no symptoms and there is no underlying heart disease, in the form of poor heart function etc. it does not need any specific measures.
If you still feel something is wrong you may make an appointment to see a different cardiologist.
All of us experience this type of rhythm and it is normal. If it is prolonged and you start to have symptoms such as chest pain, shortness of breath etc, then you should present to an ER where you could get an EKG while your in the rhythm.
Caffeine is one thing that is known to set off this type of heart rhythm. as well as stress and anxiety.
These are just my opinions and in no way would I presume to diagnosis.
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Moderator Anxiety ~ Panic Disorders
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