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Emergency and Acute Medicine – Diverticulosis
Basics
Description
Diverticulosis refers to the presence of single (diverticulum) or multiple (diverticula) outpouchings of the colonic wall that arise from colonic muscle dysfunction and are usually acquired. The typical sequence involves insufficient dietary fiber leading to reduced stool bulk, increased colonic contractions to propel stool, and a rise in intraluminal pressure. This pressure forces the mucosa and submucosa to herniate through the muscularis propria at points of weakness where the vasa recta penetrate.
Etiology
Diverticulosis can occur anywhere in the gastrointestinal tract but is predominantly a colonic disease. In Western countries, it is left-sided in approximately 95% of cases, whereas in Asian countries it is right-sided in about 70%. The sigmoid colon is the most commonly affected site.
Most colonic diverticula are pseudodiverticula, consisting only of mucosa and submucosa, and represent the most common form. True congenital diverticula, which contain all bowel wall layers, are uncommon.
The condition is common in Western societies due to refined diets and low fiber intake. Prevalence increases with age, affecting approximately 30% of individuals by age 50 and up to 65% by age 85.
Most patients are asymptomatic. About 15–25% develop diverticulitis, and 5–15% develop diverticular bleeding, with obesity as a recognized risk factor. Bleeding resolves spontaneously in roughly 75% of cases. Complications include inflammation, massive arterial bleeding (often from the right colon due to erosion of an arterial branch by a fecalith), perforation, abscess formation, and obstruction.
Diagnosis
Signs and symptoms
Patients may report chronic or intermittent abdominal pain, often triggered by eating and sometimes relieved by flatulence or bowel movements. Changes in bowel habits such as constipation or diarrhea may occur, along with dyspepsia.
Painless hematochezia is a classic presentation of diverticular bleeding and is self-limited in most cases. Bleeding from the left colon typically appears bright red, while right-sided bleeding is darker or maroon and mixed with stool. Diverticulitis and diverticular bleeding are distinct entities and rarely occur together.
On examination, patients are usually afebrile. The abdominal exam is often benign but may reveal left lower quadrant tenderness or a firm sigmoid colon. Rectal examination findings are variable, with stool either heme-negative or positive if bleeding is present.
Essential workup
A careful history and physical examination are essential and help prevent unnecessary diagnostic testing.
Diagnosis tests and interpretation
Asymptomatic diverticulosis requires no diagnostic workup. Recurrent uncomplicated painful disease also typically requires no testing. New-onset uncomplicated pain warrants evaluation to exclude carcinoma, particularly in the presence of weight loss, anorexia, or heme-positive stool.
Laboratory studies may include a complete blood count to assess leukocytosis or anemia and urinalysis to exclude urinary pathology. In hemorrhagic diverticulosis, additional studies include electrolytes, renal function tests, coagulation studies, type and crossmatch, and ECG.
Imaging options for uncomplicated painful diverticulosis include flexible sigmoidoscopy followed by barium enema, or colonoscopy, to identify diverticula and exclude malignancy.
For hemorrhagic diverticulosis, anoscopy may rule out hemorrhoids, while proctosigmoidoscopy helps localize rectal bleeding. Colonoscopy is the preferred diagnostic and therapeutic tool in stable patients, though visualization may be limited in active massive bleeding. Radionuclide imaging is sensitive for intermittent bleeding but lacks therapeutic capability. Angiography localizes active bleeding and allows intervention but carries a risk of intestinal infarction. Barium enema is rarely indicated and does not identify active bleeding.
Differential diagnosis
Painful diverticulosis should be differentiated from irritable bowel syndrome, diverticulitis, colon carcinoma, Crohn disease, renal colic, and gynecologic pathology.
Hemorrhagic diverticulosis should be distinguished from hemorrhoids, anal fissures, proctitis, colitis, carcinoma, polyps, ischemic enteritis, angiodysplasia, amyloidosis, vascular-enteric fistula, and upper gastrointestinal bleeding.
Treatment
Prehospital care
Opiates should be avoided when the cause of abdominal pain is uncertain. Establish intravenous access, and in cases of significant bleeding or hypotension administer isotonic fluid boluses and position the patient appropriately.
Initial stabilization and therapy
In massive hemorrhagic diverticulosis, priority is airway protection, supplemental oxygen, and aggressive intravenous fluid resuscitation. Large-bore intravenous access is required, with early blood transfusion if instability persists. Urinary catheterization aids in monitoring urine output, and surgical consultation is necessary for ongoing or severe bleeding.
Emergency department treatment and procedures
Uncomplicated symptomatic diverticulosis is managed conservatively with a high-fiber diet or bulk-forming agents such as psyllium, warm abdominal compresses, reassurance, and avoidance of cathartic laxatives. There is no evidence supporting routine use of antispasmodics.
Massive diverticular bleeding requires stabilization followed by colonoscopy for diagnosis and possible therapy. Radionuclide scanning or selective angiography may be used if bleeding persists, with embolization considered before surgical intervention. Segmental colectomy is reserved for refractory cases.
Medication
Medications may include bulk-forming agents and, in selected cases, anticholinergics such as dicyclomine or propantheline, although routine use is not strongly supported.
Follow-up and disposition
Admission criteria
Patients with massive hemorrhagic diverticulosis or hemodynamic instability require intensive care admission. Stable patients with ongoing or intermittent bleeding may require admission for localization and definitive management.
Discharge criteria
Patients with uncomplicated symptomatic diverticulosis or minimal bleeding who are stable, nonanemic, and without concerning features may be discharged.
Follow-up recommendations
Colonoscopy is recommended within 48 hours for stable patients. Aspirin and NSAIDs should be discontinued when possible, and dietary fiber intake increased. There is no evidence to support avoidance of nuts, corn, or popcorn.
Pearls and pitfalls
A significant proportion of patients with hematochezia have an upper gastrointestinal source. Most cases resolve spontaneously or with conservative management, though massive bleeding occurs in a minority, particularly in older patients or those with comorbidities. Colonoscopy is the preferred initial diagnostic procedure in stable patients.
Basics
Description
Diverticulosis refers to the presence of single (diverticulum) or multiple (diverticula) outpouchings of the colonic wall that arise from colonic muscle dysfunction and are usually acquired. The typical sequence involves insufficient dietary fiber leading to reduced stool bulk, increased colonic contractions to propel stool, and a rise in intraluminal pressure. This pressure forces the mucosa and submucosa to herniate through the muscularis propria at points of weakness where the vasa recta penetrate.
Etiology
Diverticulosis can occur anywhere in the gastrointestinal tract but is predominantly a colonic disease. In Western countries, it is left-sided in approximately 95% of cases, whereas in Asian countries it is right-sided in about 70%. The sigmoid colon is the most commonly affected site.
Most colonic diverticula are pseudodiverticula, consisting only of mucosa and submucosa, and represent the most common form. True congenital diverticula, which contain all bowel wall layers, are uncommon.
The condition is common in Western societies due to refined diets and low fiber intake. Prevalence increases with age, affecting approximately 30% of individuals by age 50 and up to 65% by age 85.
Most patients are asymptomatic. About 15–25% develop diverticulitis, and 5–15% develop diverticular bleeding, with obesity as a recognized risk factor. Bleeding resolves spontaneously in roughly 75% of cases. Complications include inflammation, massive arterial bleeding (often from the right colon due to erosion of an arterial branch by a fecalith), perforation, abscess formation, and obstruction.
Diagnosis
Signs and symptoms
Patients may report chronic or intermittent abdominal pain, often triggered by eating and sometimes relieved by flatulence or bowel movements. Changes in bowel habits such as constipation or diarrhea may occur, along with dyspepsia.
Painless hematochezia is a classic presentation of diverticular bleeding and is self-limited in most cases. Bleeding from the left colon typically appears bright red, while right-sided bleeding is darker or maroon and mixed with stool. Diverticulitis and diverticular bleeding are distinct entities and rarely occur together.
On examination, patients are usually afebrile. The abdominal exam is often benign but may reveal left lower quadrant tenderness or a firm sigmoid colon. Rectal examination findings are variable, with stool either heme-negative or positive if bleeding is present.
Essential workup
A careful history and physical examination are essential and help prevent unnecessary diagnostic testing.
Diagnosis tests and interpretation
Asymptomatic diverticulosis requires no diagnostic workup. Recurrent uncomplicated painful disease also typically requires no testing. New-onset uncomplicated pain warrants evaluation to exclude carcinoma, particularly in the presence of weight loss, anorexia, or heme-positive stool.
Laboratory studies may include a complete blood count to assess leukocytosis or anemia and urinalysis to exclude urinary pathology. In hemorrhagic diverticulosis, additional studies include electrolytes, renal function tests, coagulation studies, type and crossmatch, and ECG.
Imaging options for uncomplicated painful diverticulosis include flexible sigmoidoscopy followed by barium enema, or colonoscopy, to identify diverticula and exclude malignancy.
For hemorrhagic diverticulosis, anoscopy may rule out hemorrhoids, while proctosigmoidoscopy helps localize rectal bleeding. Colonoscopy is the preferred diagnostic and therapeutic tool in stable patients, though visualization may be limited in active massive bleeding. Radionuclide imaging is sensitive for intermittent bleeding but lacks therapeutic capability. Angiography localizes active bleeding and allows intervention but carries a risk of intestinal infarction. Barium enema is rarely indicated and does not identify active bleeding.
Differential diagnosis
Painful diverticulosis should be differentiated from irritable bowel syndrome, diverticulitis, colon carcinoma, Crohn disease, renal colic, and gynecologic pathology.
Hemorrhagic diverticulosis should be distinguished from hemorrhoids, anal fissures, proctitis, colitis, carcinoma, polyps, ischemic enteritis, angiodysplasia, amyloidosis, vascular-enteric fistula, and upper gastrointestinal bleeding.
Treatment
Prehospital care
Opiates should be avoided when the cause of abdominal pain is uncertain. Establish intravenous access, and in cases of significant bleeding or hypotension administer isotonic fluid boluses and position the patient appropriately.
Initial stabilization and therapy
In massive hemorrhagic diverticulosis, priority is airway protection, supplemental oxygen, and aggressive intravenous fluid resuscitation. Large-bore intravenous access is required, with early blood transfusion if instability persists. Urinary catheterization aids in monitoring urine output, and surgical consultation is necessary for ongoing or severe bleeding.
Emergency department treatment and procedures
Uncomplicated symptomatic diverticulosis is managed conservatively with a high-fiber diet or bulk-forming agents such as psyllium, warm abdominal compresses, reassurance, and avoidance of cathartic laxatives. There is no evidence supporting routine use of antispasmodics.
Massive diverticular bleeding requires stabilization followed by colonoscopy for diagnosis and possible therapy. Radionuclide scanning or selective angiography may be used if bleeding persists, with embolization considered before surgical intervention. Segmental colectomy is reserved for refractory cases.
Medication
Medications may include bulk-forming agents and, in selected cases, anticholinergics such as dicyclomine or propantheline, although routine use is not strongly supported.
Follow-up and disposition
Admission criteria
Patients with massive hemorrhagic diverticulosis or hemodynamic instability require intensive care admission. Stable patients with ongoing or intermittent bleeding may require admission for localization and definitive management.
Discharge criteria
Patients with uncomplicated symptomatic diverticulosis or minimal bleeding who are stable, nonanemic, and without concerning features may be discharged.
Follow-up recommendations
Colonoscopy is recommended within 48 hours for stable patients. Aspirin and NSAIDs should be discontinued when possible, and dietary fiber intake increased. There is no evidence to support avoidance of nuts, corn, or popcorn.
Pearls and pitfalls
A significant proportion of patients with hematochezia have an upper gastrointestinal source. Most cases resolve spontaneously or with conservative management, though massive bleeding occurs in a minority, particularly in older patients or those with comorbidities. Colonoscopy is the preferred initial diagnostic procedure in stable patients.
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