constipation
TRANSCRIPT
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Constipation in Children DR.GOPAKUMAR HARIHARAN
SENIOR REGISTRAR, COMMUNITY PAEDIATRICS
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Introduction
Background
Definition
Pathophysiology
Causes
History and physical examination
Investigations
Management
Case scenario – discussion and summary
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Background
Common – 0.7% to 30% of children: mild and short-lived to severe and chronic
Common during the introduction of solid foods to the diet, during toilet training, and at school entry.
Significant impact on quality of life
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Constipation in first year of life
Healthy infants (<6mo) can strain and cry before passing soft stools (dyschezia) - inability to co-ordinate the increase in intra-abdominal pressure with pelvic floor relaxation - Unless the stools are also hard, this is not constipation and will self-resolve
Breastfed babies pass stools as infrequently as once a week
When constipation presents early in life (<6 weeks), - think organic disease
Most children defecate at least every 2-3 days – Ask consistency
Neonates presenting with constipation – discuss with senior doctor
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Definition
( North American Society of Pediatric Gastroenterology Hepatology and Nutrition (NASPGHAN) criteria)
Delay or difficulty in defecation, present for ≥2 wk and sufficient to cause significant distress to the patient
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ROME criteria
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Organic constipation
Organic constipation results from a documented pathological condition
Anatomical malformations
Abnormal abdominal musculature
Intestinal
Connective tissue disorders
Metabolic or gastrointestinal diseases
Neuropathic disorders
Baker S, Liptak GS, Colletti RB, et al. Constipation in infants and children: evaluation and treatment. J Pediatr Gastroenterol Nutr. 1999;29:612–626
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Functional constipation
Functional constipation accounts for the majority of diagnoses ( 95%) and is caused by situational, psychological, developmental, or dietary issues
Behavioral factors - Young children may ignore the urge to defaecate, Negative feelings toward public toilets
Food allergy - milk, egg, and wheat being the most common allergens associated with constipation.
Dietary factors - fluid and dietary fiber intake are contributors in the development of functional constipation
Anal fissures
Painful defecation
Witholding Constipation
Hard stools
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Contributing factors
Changes in routine or diet
Stressful events, ie birth of a sibling, parental divorce,
Entering kindergarten and school
Intercurrent illness
Perianal irritation
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Drugs: Opiates, anticholinergic, phenobarbitone, vincristine, lead, antispasmodics
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Etiology of Constipation
• Hypothyroidism(defective colonic peristalsis)
• Opiates • Hirschsprungs
Defective filling
• Lesions of rectal muscles • Sacral cord afferent and efferent fibres• Abdominal and pelvic muscles• Defective anal sphincter relaxation
Defective emptying
Con
stip
atio
n
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Pathophysiology
Fecal continence is maintained by Involuntary muscles, Internal anal sphincter and Voluntary muscle contractions in perineum.
The external anal sphincter is under voluntary control
The urge to defecate - triggered when stool comes in lower rectum.
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Rectal ampulla- temporary storage
facility
Distension- stimulation of
stretch receptors in the wall
Contraction of rectal muscles
Relaxation of internal anal
sphincter
Signal to brain for defecation –
voluntary signal from brain to
defecate
1) Anorectal angle decreases, almost
straightens2) Relaxation of
external anal sphincter
3) Rectum contracts in peristaltic waves
Defecation
Defecation reflex
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Child who doest want to defecate
Tightens the external anal sphincter and squeezes the gluteal muscles –
Longer stay of feces in the rectum- water absorption
pushes feces higher in the rectal vault- reduces urge to defecate
Stools become harder
Withholding manoeuvre- Refusal to sit on the toilet, rise on their toes, cross their legs, scream and turn red. (Parents mistake as an attempt to defecate)
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Encopresis/Faecal soiling
Prolonged stool retention and
rectal distention
Loss of rectal sensation
Decreased urge to defecate
Liquid stool proximally percolate
downstream around hard stools
Fecal soiling
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Breast feeding versus formula feeding
Breast feeds
• Increased gastrocolic reflex• Increased prebiotic oligosaccharides
Oligosaccharides
• Substrate for gut bacteria • Improved osmotic balance- softer stools• Acts as dietary fibre
Formula
feeds
• Increased Gastric inhibitory polypeptides, motilin, Neurotensin – reduces transit
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Complications
Abdominal distension
Recurrent abdominal cramping
Decreased food intake
Vomiting
Urinary incontinence
Urinary tract infections
Anal prolapse, fissures, or hemorrhoids
Low self-esteem, depression
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History
Timing of meconium passage – most infants pass meconium in the first 24hrs of life
Straining or Painful/ precipitant
Toilet refusal and withholding behavior
Faecal or urinary incontinence, day or night
Weight loss, vomiting or PR blood loss – suggests possible organic disease
Stool description
Dietary and medication history
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Examination
Height and weight – failure to thrive
Abdomen - palpable faeces
Spine – deep sacral cleft or tuft of hair
Neurology - assessment of lower limbs
Anal area – visually examine for fissures
Internal examination not required.
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Indian J Pediatr (December 2013) 80(12):1021–1025
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Hirschsprungs disease Transition between descending colon and sigmoidReduced caliber of sigmoid and rectum
Investigations
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Functional constipation versus Hirschsprungs disease
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Medications – Disimpaction and maintenance therapy (Prevent reaccumulation of
faeces)
Dietary management
Education and behavioral management
Close follow up and slow tapering of laxatives
Management
Aim - Titrate medication aiming for one soft, easy to pass bowel action per day.
A common cause of treatment failure - stopping laxatives too early.
Osmotic and lubricant laxatives can be used safely on a long term basis (months to years).
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Disimpaction
Disimpaction regimen before maintenance treatment begins.
Oral Disimpaction as an outpatient is preferred
Fecal impaction is defined as ‘a large fecal mass in either the rectum or the abdomen, which is unlikely to be passed on demand
Benninga MA, Candy DCA, Catto-Smith AG, et al. The Paris Consensus on Childhood Constipation Terminology (PACCT) Group. J Pediatr Gastroenterol Nutr 2005;40:273-5
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Rectal medications
Rectal treatment with suppositories or enemas should be avoided when possible ( NICE guidelines), unless all oral medications have failed.
Parents should be informed that treatment with an enema may relieve symptoms faster than PEG.
Sedation with N2O or midazolam - strongly considered.
Sodium citrate 5ml enemas (Microlax") can be used. Phosphate enemas ( Proctoclysis) is an alternative
Anal fissures can be treated with topical Petroleum Jelly to provide pain relief.
Bekkali NL, van den Berg MM, Dijkgraaf MGW, et al. Rectal fecal impaction treatment in childhood constipation: enemas versus high doses oral PEG. Pediatrics 2009;124:e1108-15
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Inpatient management
Macrogol/ electrolyte solutions (Colonlytely™, Glycoprep™) 1-3L/day, via NGT at a rate of 25mL/kg/hr (maximum rate 400mL/hr, or less depending on pump used).
Normal maintenance oral fluids should be given in addition to maintain hydration.
No net fluid input and there is a risk of dehydration
Single dose of prokinetic i.e., 5 to 10 mg of metoclopramide by mouth 15 to 30 min before the lavage can be given to prevent nausea and vomiting.
Diarrhea and abdominal pain - related to its osmotic laxative effect Mugie SM, Di Lorenzo C, Benninga MA. Constipation in childhood. Nat Rev Gastroenterol Hepatol 2011;8:502-11
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Maintanance
Polyethylene glycol appears to be a reasonable first choice for maintenance therapy
Approximately 50% of all children with functional constipation recover and are taken off medication within 6 to 12 months, but about one-fourth continues to experience symptoms at adult age
Pijpers MAM, Bongers MEJ, Benninga MA, Berger MY. Functional constipation in children: a systematic review on prognosis and predictive factors. J Pediatr Gastroenterol Nutr 2010;50:256-68 Bongers MEJ, van Wijk MP, Reitsma JB, Benninga MA. Long-term prognosis for childhood constipation: clinical outcomes in adulthood. Pediatrics 2010;126:e156-62
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Laxatives
Laxatives Agents
Osmotic Lactulose PEG
Stimulant Bisacodyl Senna
Stool softner Liquid paraffinColoxyl drops
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Options- oral laxatives
Children: Stool softener (paraffin oil) or iso-osmotic laxative (Movicol™ or Osmolax™)
Infants 6-12mo: Coloxyl™ drops or Lactulose
Infants <6months: Coloxyl™ drops
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Osmotic laxatives
Luminal accumulation of
osmotically active substances
Increased intestinal fluid
Increased peristalsis
Softening of stools
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Lactulose
Osmotic gradient- increased
intraluminal fluid – colonic
peristalsis
Fermented by bacterial
enzymes to lower molecular weight
acids
Lactulose and lactitol – Synthetic
disaccharides not hydrolysed by enzymes in the small intestine
Common side effects – bloating, obdominal pain and flatulenceIntraluminal fermentation of the laxative, which results in the production of gas.
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Liquid paraffin
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Polyethylene Glycol
Polymer which is not metabolized and minimally absorbed in the intestine and, thus, creates an osmotic gradient in the lumen of the colon
Chaussade S, Minic M. Comparison of efficacy and safety of two doses of two different polyethylene glycol-based laxatives in the treatment of constipation. Aliment Pharmacol Ther 2003;17:165-72
PEG is superior to lactulose for the outcomes of stool frequency per week, form of stool, relief of abdominal pain and the need for additional products Lee-Robichaud H, Thomas K, Morgan J, Nelson RL. Lactulose versus polyethylene glycol for chronic constipation. Cochrane Database Syst Rev. 2010;7:CD007570
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Coloxyl
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Sodium Picosulphate
Stimulant laxatives are a group of laxatives that promote colonic peristalsis and secretion, through stimulation of the enteric nervous system
Tack J. Current and future therapies for chronic constipation. Best Pract Res Clin Gastroenterol 2011;25:151-8
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Fibre intake and Diet
A report from 1995 suggested using the rule “age + 5” rule to determine fiber intake
An upper limit of “age + 10” grams of fiber per day may be safe to consume, as this would be consistent with other recommendations of 10–12 g dietary fiber per 1,000 kcal.
Williams CL. Importance of dietary fiber in childhood. J Am Diet Assoc. 1995;95:1140–1146, 1149; quiz 1147–1148.
Excess fibre- reduced nutrients- reduction inweight
Avoid excessive cows milk intake
Encourage plenty of water
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Behaviour modifications
Position – footstool to ensure knees are higher than hips. Lean forward and put elbows on knees.
A toilet ring should be placed over the toilet seat if needed.
Toilet sits –5 minutes three times a day, preferably after meals. A timer in the bathroom can help. Encourage child to bulge out their abdomen. Praise child for sitting on toilet, keep toileting a positive experience.
Chart or diary – to reinforce positive behaviour and record frequency of bowel actions.
Delay toilet training attempts until child is painlessly passing soft stool.
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Follow up
GP, or with a General Paediatrician
Refer to Continence Clinic or Encopresis Clinic for faecal/urinary incontinence, suspected organic cause, complex or difficult cases.
Maintain initial “correct dose” for minimum of 3–4 mo and thereafter attempt gradual tapering.
Children with a long-standing history of constipation should be without any complaints for at least 2 months, before laxatives may be tapered gradually
Follow up at 2 wk after disimpaction and then monthly till regular bowel movement is achieved.
Check stool frequency and compliance to drug and toilet training.
Therapy is required for long duration, 6 mo to 1 y in majority
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Severe refractory constipation
Sacral neuromodulation
Surgical interventions - creation of a cecostomy for antegrade enemas.
Mugie SM, Di Lorenzo C, Benninga MA. Constipation in childhood. Nat Rev Gastroenterol Hepatol 2011;8:502-11
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Summary
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Thank You