RLR
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Okay, welcome to the forum and I've read your posting and concerns.
The reason that you sense a variation in the palpitation events is due to precisely when the nerve impulse causing them enters the cardiac cycle.
If the wayward nerve impulse traveling along the vagus nerve enters the heart during atrial depolarization, then you can experience a light, fluttering effect because the atria are smaller in size and force of action, resulting in a quiver sensation. The atria are also above the ventricles and more proximal to the apex of the thoracic cavity. Additionally, the vagus nerve also innervates the larynx, so sensations can extend upward into the throat area.
If the nerve impulse arrives during ventricular depolarization, then the subsequent sensation can be experienced as a more dramatic thump due to the size and forceful action of the ventricles.
The signal can even arrive during ventricular repolarization, or the momentary period when the heart is entirely at rest, actually producing what patients describe as a long pause.
Regardless of characterization, the entirely of events and sensations are the sole result of vagus nerve-induced palpitation events as a consequence of stress and/or anxiety. The chronic mild stimulation of the central nervous system results in the increased potential for wayward nerve impulses to arise and much like the presence of a twitching eyelid or other muscle from time to time, the heart is a muscle as much as it is an organ and likewise susceptible to the same reaction.
The events are entirely harmless and entirely incapable of inducing any type of cardiac event or spawning some type of serious arrhythmia.
You'll be fine.
Best regards,
Rutheford Rane, MD (ret.)
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