Ventriculophasic sinus arrhythmia

Ventriculophasic sinus arrhythmia

Ventriculophasic sinus arrhythmia is a non-respiratory sinus arrhythmia seen in advanced AV block and complete AV block. The PP interval enclosing a QRS complex is shorter than a PP interval not enclosing a QRS. This is supposed to be the mechanical influence of the systolic blood flow into the sinus node shortening the sinus cycle length.