Management of abscess drainage catheters:
1) Criteria for catheter removal include resolution of clinical signs of infection AND daily patent catheter output <20 mL, (1) AND repeat imaging showing resolution of the cavity. If all of these criteria are met, the drainage catheter can be cut on the back end (which releases the pig tail) and pulled out.
2) On follow-up imaging, complex cavities may not be completely evacuated despite an appropriately placed and patent drainage catheter. This is usually due to internal loculations, clots, or debris. If there is a question for need of drainage catheter up-sizing, please contact the Interventional Radiology Service
3) To maintain catheter patency, it is recommended to flush the catheter with 10 mL of saline every 8 hours, (1) followed by continued drainage.
Reference:
(1) Cronin C G, Gervais D A, Castillo C F, Mueller P R, Arellano R S. Interventional radiology in the management of abdominal collections after distal pancreatectomy: a retrospective review. AJR Am J Roentgenol. 2011;197(1):241–246.
Frequently Asked Questions
When can an abscess drainage catheter be safely removed?
An abscess drainage catheter can be safely removed when the clinical signs of infection have resolved, the daily catheter output is less than 20 mL, and imaging confirms that the abscess cavity has resolved. Once these criteria are met, the catheter can be cut on the back end to release the pigtail and then pulled out.
What should be done if an abscess cavity isn't fully evacuated?
If an abscess cavity isn't fully evacuated, despite having a properly placed and patent drainage catheter, it may be due to internal loculations, clots, or debris. In such cases, consultation with the Interventional Radiology Service is recommended to assess the need for a larger drainage catheter.
How often should an abscess drainage catheter be flushed?
To maintain patency, an abscess drainage catheter should be flushed with 10 mL of saline every 8 hours. This helps prevent blockages and ensures continued effective drainage from the abscess cavity.
What are the typical signs that an abscess is resolving?
Signs that an abscess is resolving include a decrease in pain, reduction of swelling and redness, and a decrease in fever. Additionally, imaging may show a reduction in the size of the abscess cavity, and drainage output will typically decrease.
Why might a drainage catheter need to be upsized?
A drainage catheter might need to be upsized if the abscess cavity is not fully evacuated due to factors like internal loculations or large amounts of clots and debris. Upsizing can help facilitate better drainage in complex cases.
What is the role of interventional radiology in abscess management?
Interventional radiology plays a critical role in abscess management by using imaging techniques to guide the placement and maintenance of drainage catheters. They ensure the catheter is correctly positioned to facilitate effective drainage and assess any complications that might require adjustments.
What are loculations in an abscess cavity?
Loculations are pockets within an abscess cavity that are separated by septa, or partitions, which can hinder complete drainage. They can result in incomplete evacuation of the abscess, necessitating further intervention such as catheter upsizing or additional imaging.