Design: Systematic review and meta-analysis of randomised trials
Population: 1,425 adults with liver abscess in 12 RCTs
Primary outcome: Treatment success and procedure-related complications
Effect: Success OR 4.12 (95% CI 2.01 to 8.45; I² 56%); complications OR 1.02 (95% CI 0.30 to 3.50)

A meta-analysis pooled 12 randomised trials comparing percutaneous catheter drainage with needle aspiration in 1,425 adults with liver abscess.

Catheter drainage was associated with higher odds of treatment success (OR 4.12, 95% CI 2.01 to 8.45), with moderate heterogeneity (I² 56%). The benefit was consistent in subgroups by abscess size and cause. Complication rates did not differ (OR 1.02, 95% CI 0.30 to 3.50).

Liver abscess, both pyogenic and amoebic, is common in Indian practice, and many centres still start with repeated aspiration. These data favour placing a catheter at the first procedure in most patients who need drainage. Aspiration may still suit a small abscess or one that is technically awkward for a catheter.

Remember that most amoebic abscesses settle with medical treatment alone; drainage is for those that are large, at risk of rupture, or not responding.

Consider catheter drainage as the default when a liver abscess needs percutaneous drainage
Reserve needle aspiration for small or technically difficult abscesses
Most amoebic abscesses respond to metronidazole without drainage
Drain early for large abscesses, left lobe abscesses near the pericardium, or failure to respond
Send pus for culture and amoebic testing at the first procedure

Why it matters

It challenges the habit of starting with repeated needle aspiration.

The statistics, in plain English

An odds ratio of 4.12 means about four times the odds of success with a catheter, and the confidence interval (2.0 to 8.5) is well clear of 1.0. An I² of 56% shows the trials varied moderately in effect size, so the exact benefit is less certain than its direction.