Constipation and Encopresis

Definitions & Scope - Constipation Conundrum

• Constipation (Rome IV criteria): Requires ≥2 of the following for ≥1 month in children <4 years, or ≥2 months in children ≥4 years:
  • ≤2 defecations/week
  • ≥1 episode of incontinence/week (after toilet training)
  • History of excessive stool retention
  • History of painful or hard bowel movements
  • Presence of a large fecal mass in the rectum
  • History of large-diameter stools that may obstruct the toilet
• Functional Constipation: Constipation without an identifiable organic cause.

  ⭐ Most common type of constipation in children is functional constipation (>95% of cases).

• Encopresis: Repetitive, involuntary passage of feces in inappropriate places (e.g., underwear) by a child ≥4 years old, often associated with chronic constipation.
• Epidemiology: Common, affecting up to 29.6% of children worldwide; peaks at preschool age.

Etiology & Pathophysiology - The Vicious Blockade

• Functional Causes (>95%): Most common.

  • Painful defecation (e.g., anal fissure) → stool withholding.
  • Dietary: Low fiber, ↓fluid intake.
  • Psychosocial: Coercive toilet training, stress.

• Organic Causes (<5%): Rule out if red flags. 📌 Hirschsprung's, Anorectal malformations, Metabolic (hypothyroid), Cystic Fibrosis, Celiac disease, Medications (e.g., opioids).

  ⭐ Absence of stool in rectal vault on DRE despite palpable abdominal fecal mass suggests Hirschsprung disease (vs. functional: vault usually full).

• Pathophysiology: The Vicious Cycle Stool retention → Rectal distension → ↓Rectal sensation & contractility → Fecal impaction (large, hard stool) → Painful defecation / Overflow soiling (encopresis) → Further withholding.

Clinical Assessment & Red Flags - Spotting Stool Stops

• History:
  • Stool: frequency/consistency (Bristol Stool Chart), pain, withholding behaviors.
  • Diet: ↓fiber, ↓fluid intake. Medications, psychosocial stressors.
• Examination:
  • Abdominal palpation (masses).
  • Perianal inspection: fissures, skin tags.
  • DRE: assess tone, rectal mass, stool consistency.
  • Lumbosacral examination: sacral dimple/tuft of hair.
• Functional Constipation: Diagnose using Rome IV criteria (age-specific).

Red Flags ⚠️ - Rule out organic causes:

Management Strategies - Unclogging the Works

Goals: Relieve impaction, restore regular BMs, prevent recurrence. 📌 Mnemonic: DEMAND (Disimpaction, Education, Maintenance, And No Diet fads).

1. Disimpaction (Clean-out):

• Oral: PEG 3350 (1-1.5 g/kg/day).
• Enemas: If severe/oral refusal.

2. Maintenance Therapy (months):

• Key Laxatives:

  Laxative	Dose (Maintenance)
  PEG 3350	0.4-0.8 g/kg/day
  Lactulose	1-3 mL/kg/day (in 1-2 doses)

• Others: Milk of Magnesia, senna, bisacodyl (judiciously).
• Non-Pharmacological (Concurrent):
  • Education (Parents/Child).
  • Dietary: ↑ Fiber, ↑ Fluids (avoiding diet fads).
  • Behavioral: Scheduled toileting, reward system.

3. Weaning Phase:

• Gradual laxative reduction after ~3-6 months symptom-free.

⭐ Polyethylene glycol (PEG) 3350 is the first-line osmotic laxative for both disimpaction (1-1.5 g/kg/day) and maintenance (0.4-0.8 g/kg/day) in children due to its efficacy and safety.

Encopresis Focus - Soiling Situation

• Encopresis: Fecal incontinence; involuntary soiling of feces.
• Types:
  • Retentive (Overflow): Common (>90%); chronic constipation, impaction → overflow.

    ⭐ Retentive encopresis, secondary to chronic constipation and fecal impaction leading to overflow incontinence, is the most common form (>90%) of childhood fecal soiling.

  • Non-Retentive: Less common; behavioral/psychological; no constipation.
• Management: Treat constipation; behavioral therapy; family support.

High‑Yield Points - ⚡ Biggest Takeaways

• Functional constipation is most common; exclude organic causes via red flags (e.g., delayed meconium, FTT).
• Encopresis (fecal soiling) is typically due to chronic constipation and overflow.
• Rome IV criteria guide diagnosis of functional constipation.
• Management: disimpaction, maintenance (e.g., PEG), and behavioral therapy.
• Consider Hirschsprung disease with neonatal onset or tight anal sphincter.
• Adequate hydration and fiber are supportive, rarely curative alone.