AV: atrioventricular
bpm: beats per minute
Ca+: calcium
Cl–: chloride
ECG or EKG: electrocardiogram
f waves: fibrillatory waves
K+: potassium
mL: milliliters
mm: millimeter
ms: millisecond
mV: millivolt
Na+: sodium
PAC: premature atrial complex
PAC: premature atrial contraction
PJC: premature junctional complex
PVC: premature ventricular complex
SA: sinoatrial
SVT: supraventricular tachycardia
WPW: Wolff-Parkinson-White syndrome