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Racing heart-9 year old
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Racing heart-9 year old

My healthy 9 year old son complained for the first time of a racing heart. He did not eat much this morning as he did not feel well. After he got up from the couch, he said it was beating really hard. It was racing at 140 beats a min! His chest felt like his heart was enlarged, though it wasn't. We took him to the dr. and had an ekg and blood tests. Everything was normal. Why is my son's heart beating so fast? One note, he has been on Imipramine (25 mg) for about a year off and on for bed wetting. Thanks for any responses.
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Your son may have an arrhythmia problem. They can be very difficult to 'catch' on a Holter or event monitor. Also, the rate of 140 is a bit fast, but keep in mind that a child's heart rate is always higher than an adults. Also it is important to know whether or not his heart rate jumped up on a dime, in other words did his heart rate raise up over a period of time and slow down over a period of time. If so, that would be normal, it's when the heart rate is, say, 96 then 140 then 96 instead of 96.....104.....118...125.....138....and then.....136......127.....115......108......95. If your son has a true arrhythmia problem, it is caused by a second electrical tract in the heart that is normally not there. When the impules goes down from the SA Node to the AV Node, down through The Bundle Of His and continues down to the ventricles to make them contract, that's normal. In arrhythmia problems, the impulse 'jumps' onto another tract that shouldn't be there and causes the firing, which causes the heart to beat at a fast rate. That 'jump' back and forth from the normal tract onto the abnormal tract and back to the correct tract again is what causes the arrhythmia to start and stop suddenly.
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