Stop Antibiotics Immediately - CT Negative for Diverticulitis
Since the CT scan is negative for diverticulitis, antibiotics should be discontinued immediately. The patient does not have diverticulitis and continuing antibiotics without a confirmed diagnosis exposes them to unnecessary harm including antibiotic resistance, adverse drug effects, and Clostridioides difficile infection risk.
Clinical Reasoning
Why Stop Antibiotics
The fundamental principle here is straightforward: CT imaging is essential to confirm the diagnosis of diverticulitis 1, and current guidelines emphasize that antibiotics should only be used when there is documented disease. Your CT scan has ruled out diverticulitis, which means:
- There is no inflammatory process requiring antibiotic coverage
- The original clinical suspicion was incorrect
- Continuing antibiotics provides zero benefit while incurring real harms 2
Address the Chills
The presence of chills requires investigation for an alternative diagnosis, not continuation of empiric antibiotics for a ruled-out condition. Consider:
- Alternative infectious sources: Urinary tract infection, pneumonia, viral illness, or other intra-abdominal pathology
- Non-infectious causes: Drug reaction (potentially from the antibiotics themselves), inflammatory conditions, malignancy
- Timing: Did chills develop after starting antibiotics? This could represent an adverse drug reaction
What the Guidelines Say About Imaging and Antibiotics
The 2022 ACP guidelines explicitly state that even for confirmed uncomplicated diverticulitis, antibiotics can be managed selectively rather than routinely in immunocompetent patients 2. The 2021 AGA guidelines similarly recommend selective antibiotic use 3. If antibiotics aren't even mandatory when diverticulitis IS present, they certainly aren't indicated when it's been ruled out.
Common Pitfall to Avoid
Do not fall into the trap of "completing the course" when the diagnosis is wrong. This outdated thinking leads to antibiotic overuse and contributes to the major public health threat of antibiotic resistance 2. The appropriate action when imaging excludes your suspected diagnosis is to stop empiric therapy and reassess.
Next Steps
- Discontinue antibiotics immediately
- Reassess the patient clinically - focused history and exam for the chills
- Consider alternative diagnoses based on presenting symptoms
- Order appropriate diagnostic workup for the actual clinical picture (urinalysis, chest X-ray, blood cultures if febrile, etc.)
- Monitor closely - if the patient deteriorates or develops peritoneal signs, repeat imaging may be warranted to evaluate for other acute abdominal pathology
The evidence is clear that unnecessary antibiotic use causes harm without benefit 2, 3. With a negative CT scan, you have definitively ruled out diverticulitis, and the antibiotics must be stopped.