Instead, flutter waves, or f-waves are present in saw-tooth patterns.

相反，房扑波或f波表现为锯齿形。

The number of flutter waves preceding a QRS complex corresponds to number of atrial contractions to one ventricular contraction.

一个QRS波群前的房扑波的数目，相当于一次心室收缩对应的心房收缩的数目。