Is prophylactic ciprofloxacin effective in delaying biliary stent blockage?

Area of Science:

• Gastroenterology
• Infectious Diseases
• Biomedical Engineering

Background:

• Late stent blockage is a significant complication of endoscopic stent insertion for malignant obstructive jaundice.
• Bacterial infection and biofilm formation are primary causes of stent blockage.
• This study investigates prophylactic ciprofloxacin to prevent gram-negative bacterial infections and prolong stent patency.

Purpose of the Study:

• To evaluate the efficacy of prophylactic ciprofloxacin in preventing stent blockage.
• To assess the impact of ciprofloxacin on bacterial colonization and biofilm formation in biliary stents.
• To determine if ciprofloxacin can prolong stent patency in an animal model of malignant obstructive jaundice.

Main Methods:

• A randomized, unblinded study was conducted using adult cats with surgically implanted polyethylene stents.
• Animals were divided into two groups: one received prophylactic ciprofloxacin, while the control group received no antibiotics.
• Stent patency, bacterial cultures, and signs of biliary obstruction/cholangitis were monitored throughout the study period.

Main Results:

• Control animals experienced stent blockage within 4 weeks, with predominantly gram-negative bacteria found.
• Ciprofloxacin-treated animals showed significantly prolonged stent patency (median 112 days vs. 16 days).
• Bacterial cultures from the ciprofloxacin group revealed gram-positive and anaerobic bacteria, with an absence of gram-negative bacteria.

Conclusions:

• Prophylactic ciprofloxacin effectively eliminates gram-negative bacterial infections in the bile.
• Ciprofloxacin treatment minimizes sludge formation and delays stent blockage.
• This approach shows potential benefit in managing malignant obstructive jaundice and maintaining stent patency.