Management of Complicated Diverticulitis in Elderly Patients

Immediate Resuscitation and Stabilization

The World Journal of Emergency Surgery recommends initiating aggressive fluid resuscitation with crystalloids to restore blood pressure above 90 mmHg systolic in patients with hypotension and suspected complicated diverticulitis 1, 2
Obtain immediate laboratory studies, including complete blood count with differential, C-reactive protein, lactate level, and blood cultures, as C-reactive protein >170 mg/L predicts severe diverticulitis with 87.5% sensitivity 3, 4
Start broad-spectrum IV antibiotics immediately, using carbapenem therapy, given the presence of hemodynamic instability 3, 4

The World Journal of Emergency Surgery and the Journal of the American College of Radiology recommend obtaining emergent CT abdomen and pelvis with IV contrast as soon as the patient is hemodynamically stable enough for transport, with 98-99% sensitivity and 99-100% specificity for diagnosing diverticulitis and identifying complications 2, 5
Look specifically for extraluminal air, abscess formation, free fluid, and bowel wall thickening with pericolonic fat stranding on CT imaging 2, 4

Recognize that elderly patients present atypically, with only 50% of patients older than 65 years with acute left colonic diverticulitis having pain in the lower quadrants, and only 17% having fever 1, 2, 3
The American College of Surgeons notes that in-hospital mortality for acute left colonic diverticulitis increases significantly with age, with 1.6% mortality in patients younger than 65 years, 9.7% in patients 65-79 years, and 17.8% in patients above 80 years 1

For perforation with diffuse peritonitis or feculent peritonitis, immediate emergency surgical consultation for laparotomy with colonic resection is recommended by the World Journal of Emergency Surgery 4
For large abscess (≥4 cm) without free perforation, percutaneous CT-guided drainage PLUS IV antibiotics for 4 days is recommended if the patient stabilizes with resuscitation 3, 4
For small abscess (<4 cm), IV antibiotics alone for 7 days without drainage, using carbapenem therapy, is recommended given the initial hemodynamic instability 3, 4

Do not rely on clinical examination alone to determine severity, as misdiagnosis rates are 34-68% and elderly patients present with atypical symptoms, according to the World Journal of Emergency Surgery 2, 3
Do not delay antibiotics waiting for imaging in a hypotensive patient, as mortality increases significantly with delayed treatment in septic shock, as noted by the World Journal of Emergency Surgery and Praxis Medical Insights 4
Do not assume low CRP excludes complicated diverticulitis, as 39% of patients with complicated episodes have CRP below 175 mg/L, according to the World Journal of Emergency Surgery 2, 3

Surgical consultation should be obtained immediately upon diagnosis given the high-risk presentation with hypotension, as recommended by the World Journal of Emergency Surgery and Praxis Medical Insights 1, 4
Repeat imaging if clinical deterioration occurs or if fever and leukocytosis persist beyond 48-72 hours despite appropriate treatment, as recommended by Praxis Medical Insights 4