An impulse (action potential) that originates from the SA node at a rate of 60 - 100 beats/minute (bpm) is known as<unk> .
The sinus node (SA) is located in the upper part of the wall of the right atrium. When the sinus node generates an electrical impulse, first the cells of the right atrium depolarise, then the cells of the left atrium, the AV node (atrioventricular) follows and at last the ventricles are stimulated via the His bundle.
A P wave (atrial contraction) precedes every QRS complex
The rhythm is regular, but varies slightly while breathing
The frequency ranges between 60 and 100 beats per minute
The P waves maximum height is 2.5 mm in II and/or III
The P wave is positive in I and II, and biphasic in V1
Normal sinus rhythm
Wide complex tachycardia
Sinus arrhythmia
Ectopic atrial rhythm
Narrow complex tachycardia
Lone atrial fibrillation
Fascicular VT
Ventricular flutter