Sinus Tachycardia

[Hearty99]

I am a 27 yr old male with a long family history of heart disease.  Currently I am on 20mg of Zestril once daily.  I have had two different heart monitors put on.  One was questionable for atrial flutter and the other showed lots of sinus tach.  I also had an echo which was normal other than a slightly enlarged left atrium (22-25cm).  My stress test showed early R wave progression and some abnormal ST segments (whatever that means).  Currently, i am experiencing bouts of slow heart rates and then fast heart rates.  My cardiologist says I am too young for heart disease.  I am overweight and smoke about 1 pack a day.  Should I push for an EP study or a cath?  Should i be concerned?

[Hearty99]

Also, sometimes at night when lying down my heart "thumps" or "jumps" for several minutes and I start to cough.  Laying on my left side worsens it.  By the way, all i have to do is walk up a few stairs and my heart rate is 170-200bpm.  Resting it is around 100-115bpm.  I was on atenolol but it made my tired.  could this be a-fib or a-flutter?

[Hearty99]

My heart rate goes up to around 170bpm.  I get light headed and weak.  My cardiologist feels that an EP study or cath is to invasive at my age

[underinformed35]

How high and low is your heart rate going? Are you having any symptoms with the heart rate changes?