2021年12月2日 — A premature atrial complex (PAC) is a premature beat arising from ectopic pacemaking tissue within the atria. There is an abnormal P wave, ...
Premature atrial contraction (PAC), also known as atrial premature complexes (APC) or atrial premature beats (APB), are a common cardiac dysrhythmia ...
If a PAC occurs when the AV node has not yet recovered from the refractory period, it will fail to conduct to the ventricles; this means there will not be a QRS ...