RLR
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Hi Lee,
Well, I certainly don't believe the episodic paroxysmal tachycardia to be psychological in origin. The sensations in your abdomen would suggest the effects of epinephrine (adrenaline). I would presume that your doctors have ruled out the presence of a pheochromocytoma or in more rare instances a paraganglioma. I doubt that it's the case here, but we want to be certain that it's been considered.
In most instances of PAT or PSVT, the cause is due to a re-entrant node that tends to excite the pacers in a cyclic manner that produces the rapid rate being experienced. Ablation procedures in some instances can be warranted, but I'm not certain whether you would necessarily be a candidate. In other cases, the disturbance can be entirely ideopathic, or in other words the cause is never identified.
Realize that exercising on an empty stomach does not preclude the manifestation of indigestion or other GI disturbance. Many times, hyperacidity can result from aggressive exercise programs and in some instances of errant reflux, acid that penetrates the esophageal corridor can indeed produce tachycardia. Also be aware that all caffeinated products increase acidity and elevate the central nervous system activity to at least some extent.
The fact that your cardiac evaluation panel was clear, literally means that the characteristic forms of pathology capable of inducing the problem are absent. Negative means negative with respect to test outcomes. So whatever is producing the syndrome as it relates to your activity or exercise level is being instrumented by other means, either the instance I spoke of regarding your GI circumstances or possibly your thyroid etc, etc. (not likely but possible nonetheless).
You're going to be fine and the cause can certainly be identified and treated in order to permit you the reaquisition of your lifestyle.
Best regards and Good Health
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