My 5 year old has diagnosed sinus tachycardia. Her at rest heart rate is 120. Sleeping its 90. I was told she would outgrow it but she has not. When she was 2 she had a Holter, Echo and since an EKG. All show normal. Upon illness, (rarely otherwise) she gets asthma like symptoms (since 2 years when she got RSV). She gets Xoponex and Flovent surrounding these episodes. Yet she has the ST all the time.... why? What causes this? and what if she doesn't outgrow it?
Actually, this is not considered sinus tachycardia, in reality. For a five-year old, the normal heart rate range is between 60 to 130. So, the real question is whether she is symptomatic with this heart rate, including whether she is able to exercise with other children and keep up with them, whether she is aware of her heart beating “abnormally”, etc. Without seeing her specific information, I can’t say for sure if her findings are normal. One other factor that can lead to increased resting heart rate is uncontrolled asthma. It sounds as if she is taking a rescue medication and a controller medication (Xopenex and Flovent, respectively) during acute exacerbations. However, she may have low level persistent inflammation in her lungs, which means that she may need to be using her Flovent on a routine basis. I would discuss this further with your primary care provider, including consideration of measurement of her peak flow rates or pulmonary function testing to assess for uncontrolled mild asthma.
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