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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