What percentage of adults treated with antibiotics for acute appendicitis had recurrence after 10 years?
For adults with uncomplicated acute appendicitis, antibiotics are a safe alternative to surgery in the short term. However, the risk of recurrence over a longer period is a key concern. The best available long-term data come from the APPAC trial, which followed patients for 10 years. At 10 years, about 37.8% of patients initially treated with antibiotics had a recurrence of appendicitis, and 44.3% eventually had an appendectomy 5. This means that while many patients avoid surgery initially, nearly half will need it within a decade.
What the research says
The APPAC randomized clinical trial, conducted in Finland, followed 257 adults (aged 18-60) with CT-confirmed uncomplicated acute appendicitis who were treated with antibiotics (intravenous ertapenem for 3 days followed by oral levofloxacin and metronidazole for 7 days). At 10-year follow-up, the recurrence rate was 37.8% and the appendectomy rate was 44.3% 5. These findings are consistent with shorter-term studies: a 2022 meta-analysis of randomized trials found that about 34% of patients treated with antibiotics required appendectomy within one year 37. Another analysis from the APPAC II trial reported that at 3 years, the treatment failure rate (including recurrence) was around 27% for oral antibiotics and 30% for intravenous-plus-oral antibiotics 8. The 10-year data from APPAC show that the risk of recurrence continues to accumulate over time, though most recurrences happen in the first few years 5. Importantly, the long-term outcomes also showed that among patients who had an appendectomy after antibiotic treatment, there were no significant differences in complication rates compared with those who had immediate surgery 56.
What to ask your doctor
- Based on my CT findings, do I have uncomplicated appendicitis that might be suitable for antibiotic treatment?
- What is my personal risk of recurrence if I choose antibiotics, and how does that compare with the risks of surgery?
- If I choose antibiotics, what symptoms should prompt me to come back to the emergency department?
- Are there any factors (like age, sex, or appendix size) that might make antibiotics less likely to work for me?
- How long after antibiotic treatment would I need follow-up imaging or appointments to monitor for recurrence?
This question is drawn from common patient questions about Gastroenterology and answered using cited medical research. We do not provide individualized advice.