An electrophysiology study of the conduction system can help discern the severity of conduction system disease. In an electrophysiology study,<unk>  due to AV nodal disease is represented by a prolonged AH interval (denoting prolonged time from impulse generation in the atria and conduction to the bundle of His) with a relatively preserved HV interval (denoting normal conduction from the bundle of His to the ventricles).<unk>  due to distal conduction system disease is represented by a normal AH interval and a prolonged HV interval. In the absence of symptoms, a prolonged AH interval is likely benign while a prolonged HV interval is almost always pathologic.
Trifascicular block
Bifascicular block
Fascia iliaca block
Brachial plexus block
Transverse abdominis plane block
Paracervical block
Spinal manipulation
Nerve induction