36+ Sinus Rhythm With Bundle Branch Block Ecg Background. Bundle branch block is an abnormal finding on an electrocardiogram (ecg). The left ventricle is activated normally, meaning that the early part of the qrs complex is unchanged.

The sinus node (sa) is located in the roof of the right atrium.

A sinus rhythm is any cardiac rhythm where depolarisation of the cardiac muscle begins at the sinus node. Right bundle branch block (rbbb). This ecg also has an interesting rhythm. Suitable for most medical after a brief delay, the impulse travels down the bundle branches, thought the purkinje fibers to the sinus tachycardia is a normal sinus rhythm but with a heart rate over 100 bpm.