heart rate spikes?

[chris5666]

I think my heart rate has spead up slightly since my surgery of four months ago. When I work out or do physical activity, I now get dizzy and my heart rate spikes up to 180.  This happens while running half a mile.  I use to work really hard to get my heart rate to 170 before the surgery and notice it easily surpases that rate now.

Does anyone have insight to whether this could be a symptom of the synthroid?

Thanks.

[goolarra]

I don't think it's any indication whatsoever of possible heart problems.  Although thyroid meds are a synthetic hormone, they're just like any other drug and have side effects, one of which is a faster HR.  You also might find that this goes away as you recover more from your surgery...it takes longer than you might think.  Also, you're probably not yet at your "ideal" dose of Synthroid.  Sometimes this takes some fine-tuning.

[chris5666]

Does this mean I will have heart problems?

[goolarra]

Synthroid does increase HR, in some people more than others.  It does this by increasing the adrenalin receptors in the heart.  Some people find switching to a different brand name or from generic to brand helps.