The electrovesicogram in the overactive bladder: role in determining pathogenesis and diagnostic significance

Area of Science:

• Urology
• Physiology
• Electrophysiology

Background:

• Abnormal smooth muscle contractility is a hallmark of overactive bladder (OAB).
• The underlying cause of OAB contractility derangements remains incompletely understood.
• Investigating bladder smooth muscle electrical activity may elucidate OAB pathophysiology.

Purpose of the Study:

• To test the hypothesis that abnormal smooth muscle electrical activity underlies overactive bladder (OAB) contractility.
• To compare the electrophysiological patterns of the bladder in OAB patients and healthy volunteers.

Main Methods:

• Percutaneous electrovesicography was employed in 22 OAB patients and 14 healthy controls.
• Recordings were obtained with suprapubic electrodes while the bladder was both full and empty.
• Analysis focused on slow wave (SW) frequency, amplitude, and conduction velocity.

Main Results:

• Healthy volunteers displayed regular, triphasic slow waves (SWs) with higher amplitude when the bladder was full.
• OAB patients demonstrated a dysrhythmic electrical pattern, with irregular SW frequency, amplitude, and conduction velocity.
• Recordings from OAB patients revealed coexisting tachyrhythmic, bradyrhythmic, and arrhythmic areas.

Conclusions:

• The dysrhythmic electrical activity observed in OAB patients, including varied rhythmic and arrhythmic zones, is proposed to explain abnormal bladder contractions and symptoms.
• Electrovesicography shows promise as a diagnostic tool for overactive bladder (OAB).
• Further research is needed to determine the etiology of the observed dysrhythmic electrical patterns in OAB.