Intravesical ethanol test: an ineffective measure of bladder hyperpermeability

Area of Science:

• Urology
• Gastroenterology

Background:

• Interstitial cystitis (IC) is a chronic condition characterized by bladder pain and urinary urgency.
• Bladder hyperpermeability is a suspected factor in IC pathogenesis.
• Current diagnostic methods for IC can be invasive or lack specificity.

Purpose of the Study:

• To assess the utility of the intravesical ethanol test as a quantitative diagnostic tool for bladder hyperpermeability in patients with interstitial cystitis.
• To determine if ethanol instillation can be detected systemically, indicating bladder permeability.

Main Methods:

• Three patients with diagnosed interstitial cystitis and positive Parsons potassium tests underwent the intravesical ethanol test.
• Ethanol concentrations were escalated from 10% to 20% and instilled intravesically for 30 minutes.
• Systemic ethanol absorption was monitored using breathalyzer readings for 60 minutes post-instillation.

Main Results:

• All patients exhibited qualitative signs of bladder hyperpermeability on the Parsons potassium test.
• No detectable systemic absorption of ethanol was observed in any patient, even with 20% concentration.
• The intravesical ethanol test did not induce significant pain or irritative voiding symptoms.

Conclusions:

• The intravesical ethanol test, as performed, is not a useful clinical tool for diagnosing or managing interstitial cystitis.
• Investigating higher ethanol concentrations might be necessary to establish its diagnostic potential.
• Further studies are needed to explore alternative methods for quantifying bladder hyperpermeability in IC.