Good morning and as far as I know there is no glossary of abbreviations here for medical terminology. Most of the abbreviations such as PVCs you can google. Otherwise do post here and just ask and I will find you the answer.
PVC = Premature Ventricular Contraction
PAC = Premature Atrial Contraction
SVT = Supraventricular tachycardia
If you Google the abbreviation add heart to the search so you don't get lots of info on other topics that use the same abbreviations.
Hope this helps you. Take care and stick with us.