Diverticulitis

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Quick Reference

RxDrug of choiceAmoxicillin-clavulanate 875/125 mg BID (if antibiotics indicated)

AltAlternativesCiprofloxacin 500 mg BID + Metronidazole 500 mg TID

DxTest of choiceCT Abdomen/Pelvis with IV contrast

ScKey scoreHinchey Classification (Stages I-IV)

→When to referAbscess ≥3 cm, free perforation, failure of outpatient therapy, or recurrent episodes impacting quality of life.

Uncomplicated diverticulitis in healthy patients often requires only supportive care; complicated disease requires CT-guided drainage or surgery and mandatory follow-up colonoscopy.

Diverticulitis is an inflammatory complication of colonic diverticulosis, affecting 10% to 25% of patients with the condition [6, 10]. It is a leading cause of [[gastrointestinal]] hospitalizations, with rising incidence in younger populations [3, 12]. Modern management emphasizes distinguishing simple from complicated disease to guide the selective use of antibiotics and surgical intervention.

Overview and Recommendations

Background

•Diverticulitis represents the symptomatic inflammation or infection of colonic diverticula, which are mucosal herniations through the muscularis propria at points of vascular penetration (vasa recta).
•The incidence of the disease has risen to approximately 188 per 100,000 person-years in the U.S., with a significant and concerning shift toward individuals under age 50.
•Genetic susceptibility accounts for 40% to 50% of the risk, often involving loci related to connective tissue integrity (Type III to Type I collagen ratios) and epithelial barrier function.
•The Hinchey Classification remains the clinical gold standard for staging: Stage I (pericolic abscess/phlegmon), Stage II (pelvic abscess), Stage III (purulent peritonitis), and Stage IV (fecal peritonitis).
•Complicated diverticulitis—defined by the presence of abscess, fistula, obstruction, or perforation—carries a 1-year mortality rate of approximately 18.8% and requires aggressive intervention.

Evaluation

•Suspect acute diverticulitis in patients presenting with constant, localized left lower quadrant (LLQ) pain, though right-sided pain may dominate in Asian populations or cecal variants.
•Ask about alterations in bowel habits (constipation in 50%, diarrhea in 30%) and systemic symptoms like fever, nausea, or urinary urgency, which may suggest a developing colovesical fistula.
•Examine for localized tenderness or a palpable mass (suggesting phlegmon/abscess); immediate surgical consultation is required if diffuse peritonitis, rebound, or abdominal rigidity is present.
•Order a (leukocytosis is present in ~55% of uncomplicated cases) and C-reactive protein (CRP > 50 mg/L suggests complicated disease).
•Calculate the Neutrophil-to-Lymphocyte Ratio (NLR); a threshold > 5.11 may be more sensitive than CRP for identifying patients requiring surgical intervention.
•Order CT of the abdomen and pelvis with IV contrast as the gold-standard diagnostic test (sensitivity 94-99%) to confirm the diagnosis and identify complications like extraluminal air or abscess.
•Utilize MRI without gadolinium or ultrasound for pregnant patients to avoid ionizing radiation while assessing for bowel wall thickening (>3 mm) and fat stranding.
•Avoid acute during the initial presentation due to the theoretical risk of converting a contained perforation into a free perforation via insufflation.
•Schedule a follow-up colonoscopy 6 to 8 weeks after the resolution of symptoms to exclude colonic malignancy, which mimics diverticulitis on CT in up to 5% of complicated cases.

Management

•Omit routine antibiotics in immunocompetent patients with uncomplicated diverticulitis (Hinchey Ia) and mild symptoms, as they do not improve recovery or prevent complications.
•Initiate outpatient management for stable patients with clear liquids and close follow-up; transition to a high-fiber diet only after the acute phase resolves.
•Administer broad-spectrum antibiotics for complicated or high-risk cases: 400 mg IV every 12 hours plus 500 mg IV every 8 hours is a standard regimen.
•Utilize 3.375 g IV every 6 hours as an alternative for hospitalized patients with systemic inflammatory response syndrome (SIRS).
•Transition to oral 875/125 mg BID for a total 7–10 day course once the patient is clinically stable and tolerating oral intake.
•Refer for CT-guided percutaneous drainage if an abscess is ≥3 cm; collections <3 cm often resolve with IV antibiotics alone.
•Perform emergency for purulent (Hinchey III) or fecal (Hinchey IV) peritonitis; primary anastomosis is preferred over Hartmann’s procedure when hemodynamically feasible.
•Avoid laparoscopic peritoneal lavage for Hinchey III disease, as long-term data show higher reintervention rates (27%) compared to primary resection (7%).
•Manage acute diverticular hemorrhage with (EBL), which reduces rebleeding risk by over 50% compared to hemoclips (NNT = 8).
•Recommend long-term lifestyle modifications: high fiber intake (fruit/cereal), reduced red meat consumption (<6 servings/week), and vigorous physical activity to reduce recurrence risk by up to 50%.
•Avoid the routine use of for secondary prevention, as Phase 3 trials (PREVENT 1/2) demonstrated no benefit in reducing recurrence rates.
•Consider cyclic 400 mg BID for 7 days per month for patients with symptomatic uncomplicated diverticular disease (SUDD) to reduce chronic symptoms.

Board Review — High Yield

•Hinchey Stage III vs IV — Stage III is purulent peritonitis (non-communicating), Stage IV is fecal peritonitis (communicating perforation).
•Nuts and Seeds — Historical avoidance is unnecessary; they are not associated with increased risk of diverticulitis.
•Follow-up Colonoscopy — Essential 6-8 weeks post-resolution to rule out occult colorectal cancer, especially in complicated cases.
•Antibiotic Stewardship — The AVOD and DIABOLO trials support omitting antibiotics in uncomplicated, immunocompetent cases.
•Diverticular Bleeding — Most common cause of brisk hematochezia; usually painless and occurs in the absence of diverticulitis.
•Right-sided Diverticulitis — More common in Asian populations and younger patients; often mimics appendicitis.
•NSAIDs and Aspirin — Significant risk factors for both diverticulitis and diverticular hemorrhage.
•Hartmann's Procedure — Traditionally the standard for perforation, but primary anastomosis is now preferred in stable patients to avoid permanent stomas.

Deep Dive — Evidence Details

Classification & Nomenclature

▸Simple diverticulitis accounts for the majority of cases and often requires minimal intervention [8, 11].
▸Hinchey Stage III and IV represent surgical emergencies with high mortality [9, 13].

HY High Yield: Distinguishing simple from complicated disease is the most critical step in initial assessment.

Diverticulitis is categorized as Simple (uncomplicated), involving localized inflammation, or Complicated, defined by abscess, fistula, obstruction, or perforation ^[8]^A1b^[11]^B2b. The Hinchey Classification remains the surgical gold standard ^[13]^D5^[14]^A1a.

Classification	Stage	Clinical Feature	Management
Hinchey	I	Pericolic abscess/phlegmon	^[14]^A1a
Hinchey	II	Pelvic/distant abscess	Percutaneous drainage ^[14]^A1a
Hinchey	III	Purulent peritonitis	Urgent surgery ^[2]^A1c^[13]^D5
Hinchey	IV	Fecal peritonitis	Emergency surgery ^[9]^A1a^[13]^D5

Low serum 25-hydroxyvitamin D (<20 ng/mL) is associated with increased hospitalization risk ^[4]^B3b. Pearl: Diverticulitis is no longer viewed as a purely surgical disease; modern classification emphasizes distinguishing simple from complicated phenotypes to avoid unnecessary hospitalization and antibiotics in low-risk patients ^[3]^A1c^[8]^A1b^[14]^A1a.

Pathophysiology & Mechanism

▸Connective tissue alterations (Type III to Type I collagen ratio) reduce colonic wall tensile strength [30, 35].
▸Vasa recta stretching over the diverticulum dome predisposes to both inflammation and hemorrhage [20, 33].

HY High Yield: Dysbiosis-driven low-grade inflammation and ER stress contribute to epithelial barrier failure [16, 31].

Diverticula form at vasa recta penetration points due to high intraluminal pressure and extracellular matrix (ECM) remodeling ^[15]^D5^[18]^B3b^[31]^D5. Genetic factors account for 40% to 50% of risk ^[27]^B2a. Pathogenesis involves microbial dysbiosis (depletion of fiber-degrading taxa) and mucosal immune activation (upregulation of TNF-α and IL-6) ^[15]^D5^[16]^D5^[28]^B3a. Micro-perforation occurs when localized ischemia leads to focal necrosis of the thin diverticular wall ^[15]^D5^[20]^D5. Pearl: Diverticulitis is increasingly viewed as a chronic inflammatory and neuromuscular disorder rather than a simple mechanical obstruction, with genetic factors explaining up to 50% of phenotypic variance ^[18]^B3b^[27]^B2a.

Pathogenic Drivers of Diverticular Disease

Mechanism	Pathophysiological Effect	Clinical Consequence
ECM Remodeling	Reduced wall compliance and collagen defects	Diverticula formation
Myochosis	Circular muscle thickening and shortening	Segmental high-pressure zones
Dysbiosis	Loss of commensal diversity; increased Proteobacteria	Low-grade mucosal inflammation
Visceral Hypersensitivity	Altered sensory-motor signaling	Post-diverticulitis IBS-like symptoms

Clinical Presentation

▸Urinary symptoms (frequency/urgency) may signal an adjacent sigmoid inflammation or colovesical fistula [20].
▸A palpable mass (20% of cases) suggests a phlegmon or localized abscess [20, 29].

! Warning: Fever >38.5°C (101.3°F) and hemodynamic instability are red flags for complicated disease [77, 79].

Left lower quadrant (LLQ) pain is the hallmark (70-93% of cases), typically constant rather than colicky ^[20]^D5^[29]^D5. Right-sided disease is more common in Asian populations and mimics appendicitis ^[84]^B3b^[85]^C4. Constipation occurs in 50% of cases, while diarrhea occurs in 30% ^[20]^D5^[29]^D5. Fever and leukocytosis may be absent in the elderly or immunocompromised ^[20]^D5. Signs of peritonitis (rigidity, guarding) indicate Hinchey III/IV disease ^[29]^D5^[77]^D5. Pearl: While LLQ pain is the classic presentation, the absence of fever or leukocytosis does not exclude diverticulitis, and any signs of peritonitis should prompt immediate CT imaging to rule out Hinchey III/IV disease ^[20]^D5^[77]^D5^[79]^A1c.

Clinical Signs and Performance

Finding	Sensitivity	Specificity	Clinical Significance
LLQ Tenderness	90-95%	Low	Primary diagnostic clue ^[20]^D5
Rebound/Guarding	Low	High	Suggests perforation/peritonitis ^[29]^D5
Palpable Mass	~20%	Moderate	Suggests abscess or phlegmon ^[20]^D5
Fever (>38°C)	40-60%	Moderate	Indicates systemic inflammation ^[29]^D5

Diagnosis & Workup

▸Ultrasonography is a viable alternative in pregnancy (Sensitivity 92%) [99, 101].
▸Sterile pyuria is common due to bladder irritation from adjacent inflammation [77].

HY High Yield: Follow-up colonoscopy is mandatory after complicated diverticulitis to rule out colorectal cancer [41, 59].

CT abdomen/pelvis with IV contrast is the gold standard (Sensitivity 94-99%, Specificity 99%) ^[77]^D5^[102]^B3b. Findings include wall thickening (>3mm) and fat stranding ^[102]^B3b. CRP >50 mg/L and Neutrophil-to-Lymphocyte Ratio (NLR) >4.5 help identify complicated cases ^[82]^B3b. Acute is contraindicated due to perforation risk, but follow-up is required 6-8 weeks post-resolution to exclude malignancy (found in 7.9% of complicated cases) ^[41]^B3a^[77]^D5^[89]^A1b. Pearl: CT imaging is the definitive diagnostic tool, but its primary role in modern practice is to identify the 5% of patients with occult malignancy or those requiring drainage of an abscess >3 cm ^[41]^B3a^[77]^D5.

Hinchey Classification and Diagnostic Findings

Stage	CT Findings	Clinical Significance
Stage Ia	Pericolic inflammation/phlegmon	Uncomplicated; usually outpatient management.
Stage Ib	Contained pericolic abscess (<3-4 cm)	Complicated; may require antibiotics ± drainage.
Stage II	Distant (pelvic/retroperitoneal) abscess	Complicated; often requires IR-guided drainage.
Stage III	Generalized purulent peritonitis	Surgical emergency; requires resection or lavage ^[87]^A1b.
Stage IV	Generalized fecal peritonitis	Surgical emergency; high mortality risk.

Acute Management

▸Endoscopic band ligation (EBL) is superior to clipping for diverticular hemorrhage (NNT=8) [44].
▸Sigmoidectomy with primary anastomosis is superior to Hartmann’s Procedure for stoma-free rates [120].

Rx Drug of Choice: Amoxicillin-clavulanate 875/125 mg is the standard oral transition for stable patients [121].

Outpatient management without antibiotics is appropriate for immunocompetent patients with uncomplicated disease (Hinchey Ia) ^[78]^A1b^[115]^A1b^[121]^A1b. For complicated or high-risk cases, use broad-spectrum coverage: 400 mg IV q12h + 500 mg IV q8h, or 3.375 g IV q6h ^[115]^A1b^[121]^A1b. Transition to oral 875/125 mg BID for 7-10 days ^[121]^A1b. For Hinchey III/IV, sigmoidectomy is preferred over laparoscopic lavage ^[87]^A1b^[119]^A1b. Pearl: Omit antibiotics in immunocompetent patients with uncomplicated diverticulitis; for perforated cases with purulent peritonitis, primary resection is superior to laparoscopic lavage due to lower reintervention rates (27% vs 7%) ^[119]^A1b^[121]^A1b^[123]^A1b.

Dosing Table for Acute Diverticulitis Management

Drug	Starting dose	Target / max dose	Renal adjustment	Hepatic adjustment	Key monitoring
Amoxicillin-clavulanate	875/125 mg PO BID	875/125 mg TID	CrCl <30: avoid 875mg tab	Use with caution	Hepatic enzymes, diarrhea
Ciprofloxacin	400 mg IV q12h	400 mg q8h	CrCl 30-50: q18h; <30: q24h	No adjustment	QTc interval, tendonitis
Metronidazole	500 mg IV q8h	500 mg q8h	No adjustment	Severe impairment: reduce 50%	Neuropathy, disulfiram reaction
Piperacillin-tazobactam	3.375 g IV q6h	4.5 g q6h	CrCl <20: 2.25 g q8h	No adjustment	Cr, CBC (leukopenia)

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