I am a 57 YO female with Wolfe-Parkinson-White (WPW) Syndrome.
Until I discovered last December that I was hypothyroid, the WPW had
manifested as sporadic bouts of tachycardia (rapid heart beat) that I
had managed for 50+ years without medication or ablation. My primary
care physician (PCP) started me on 88 mcg of Levothyroxine (L). After 2
weeks, the tachycardia had increased in both frequency and duration, so
I reducedto 44 mcg. After a few weeks at 44, the tachycardia
returned. I cut back to 25 mcg. However, under pressure from my PCP
to increase my dosage, I tried going back to 44, with no luck. Finally, in
March, I saw an electrophysiologist (cardiologist specializing in electrical
issues) who put me on 25 mg of the beta-blocker Atenolol (A), which
eliminated the tachycardia caused by the 25 mcg of L. I have since
increased L to 44 mcg, but after a month at 44, I am having some
episodes of tachycardia (tolerable frequency). My EP tells me that the A
will most likely increase the need for L and that as I increase the L, I
will also have to increase the A. I would be interested in hearing from
anyone who has experience managing L and tachycardia
simultaneously. On 25 mcg of L, all of my hypothyroid symptoms had
disappeared, but my labs were still abnormal (TSH-43.9, T3-1.7,T4-
0.8). Since I feel fine and don't want to get into the vicious circle of the
L requiring more A requiring more L, I'd be interested in comments on
the long-term effects of undertreating my "numbers" as opposed to
adequately treating my symptoms.
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