4 year old possible svt (supraventricular tachycardia)

Machaon

He could be reacting to the dyes, or materials in his bedding. If, consistantly, he has heart rhythm problems ONLY when put into bed, then there could be something there that could be the cause.

I assume that this hasn't happened on previous nights. Is there something that has recently changed in his bedding? Or....... has he recently had a cold?

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kdel

thanks for replying, I havn't changed anything in the bedding and that was the first time this ever happened. He didn't have a cold then but does now. I asked the doctor about this but she said that this was too much for a cold. Also had zyrtec for the first time that night(hives x3 weeks) but pediatrician, allergist, cardiologist and pharmacist all said this was not a reaction to the zyrtec.

Machaon

From what I've read, tachycardia is a very rare side effect of zyrtec.

It could be that, when your child was first invaded by the cold virus, and prior to symptoms of a cold, the extra hormones, such as epinephrine, which his body normal produced as a defense mechanism against the cold virus, were part of the cause of his tachycardia. Many times there are multiple "events" that lead up to an infrequent bout of tachycardia.

Perhaps, for some reason, leading up to your son's tachycardia, he ate or drank something that also could cause heart stimulation, such as caffeinated soda, or even too much candy, or he had encountered allergens, which can also cause a similar activation of epinephrine and other hormones.

Since you now know that your child is prone to tachycardia, you might consider getting an inexpensive stethoscope, so that you can listen to your child's normal heartbeat, and thus give yourself some peace of mind, if his heart normally has a nice regular rhythm.

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⇒ I use $6 fluticasone nasal spray as my asthma inhaler! BID! Saves me $$$
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kdel

That is interesting about the epinephrine , I didn't realize that happened when we are trying to fight a virus or infection. I wonder why none of the doctors mentioned this could be the cause, it may have eased my mind a bit. Maybe that combined with the antihistamine was just too much for his little body. Thank you very much for the insight.