Postural orthostatic tachycardia syndrome [POTS]
A disorder that causes an increased heart rate when a person stands upright
Cardiac
Premature Atrial Contractions [PAC]
Are premature heartbeats that are similar to PVCs, but occur in the upper chambers of the heart, an area known as the atria. PACs do not typically cause damage to the heart and can occur in healthy individuals with no known heart disease.
Premature ventricular contraction [PVC]
An early or extra heartbeat that happens when the heart’s lower chambers (the ventricles) contract too soon, out of sequence with the normal heartbeat