Constipation


Article Author:
Sorangel Diaz


Article Editor:
Magda Mendez


Editors In Chief:
Patricia Maani-Fogelman
Julianne Oates


Managing Editors:
Frank Smeeks
Scott Dulebohn
Erin Hughes
Pritesh Sheth
Mark Pellegrini
James Hughes
Richard Ciresi
Phillip Hynes


Updated:
11/18/2018 7:43:34 PM

Introduction

Functional constipation is a prevalent condition in childhood, about 29.6% worldwide. In the United States, represents 3% to 5% of pediatric visits and a considerable annual health care cost. Most children do not have an etiological factor, and one third continue to have problems beyond adolescence. Up to 84% of functionally constipated children suffer from fecal incontinence, while more than one-third of children present with behavioral problems primary or secondary due to constipation. Pathophysiology underlying functional constipation is multifactorial and not well understood. Factors that may contribute to functional constipation include pain, fever, dehydration, dietary and fluid intake, psychological issues, toilet training, medicines, and family history of constipation.[1][2][3]

Chronic idiopathic constipation is characterized by lack of periodicity in defecating, difficulty or pain during defecation without an identifiable organic cause, such as physiological, anatomical, radiological, or histological. Even though this is a common problem in children, an underlying cause is identified in less 5% of cases.

Etiology

Causes of constipation may be divided into following broad categories:

  1. Functional (Non-Organic) or Retentive: which includes constipation due to fecal withholding behaviors and when all organic causes have been ruled out.
  2. Anatomic causes include anal stenosis or atresia, anteriorly displaced anus, imperforate anus, intestinal stricture, anal stricture.
  3. Abnormal musculature related causes include prune belly syndrome, gastroschisis,  down syndrome, muscular dystrophy.
  4. Intestinal nerve abnormality-related causes include Hirschsprung disease, pseudo-obstruction, intestinal neuronal dysplasia, spinal cord defects, tethered cord, spina bifida
  5. Drugs like anticholinergics, narcotics, antidepressants, lead, vitamin D intoxication.
  6. Metabolic and endocrine causes like hypokalemia, hypercalcemia, hypothyroidism, diabetes mellitus (DM), or diabetes insipidus.
  7. Other causes include celiac disease, cystic fibrosis, cow milk protein allergy, inflammatory bowel disease, scleroderma, among others.

Epidemiology

Constipation can occur in any age group starting from newborn to older people; overall, it is seen more commonly in females than males. Also, the non-white population has been reported to have a 30% higher prevalence than the white population.[4][5][6]

The pattern and frequency of defecation depend on a child’s age. During neonatal period and early infancy, bowel movements can present more than 4 times per day, eventually trending down to 1 to 2 per day by toddler age. At this point, children usually have achieved voluntary control of their sphincter. Hence, there is a correlation between bowel movements and age.

Pathophysiology

The cause of constipation is multifactorial. The problem may arise in the colon or rectum or it may be due to an external cause. In most people, slow colonic motility that occurs after years of laxative abuse is the problem. In a few patients the cause may be related to an outlet obstruction like rectal prolapse or a rectocele. External causes of constipation may include poor dietary habits, lack of fluid intake, overuse of certain medications, an endocrine problem like hypothyroidism or some type of an emotional issue.

History and Physical

Rome IV criteria establish functional constipation when 2 or more of the following are present for at least one month for infants and children up to 4 years. For children older than 4 years of age, symptoms should last for at least 2 months:

  • Two or fewer bowel movements per week
  • At least one episode of fecal incontinence per week after the child has acquired complete bowel control
  • History of extensive fecal retention or withholding behavior by the child
  • Having hard and painful stools
  • Large fecal mass on digital rectal examination
  • Large in diameter of stools that cause rectal outlet obstruction

Careful history and examination are usually sufficient to make a diagnosis. A thorough history is recommended as part of a complete evaluation of a child with constipation. However, the answer to which aspects of the clinical history are most pertinent are not defined. Paramount information includes the time after the birth of the first bowel movement, the period the condition has been present, the incidence of bowel movements, consistency and the size of the stools, whether defecation is painful, whether blood is present on stool or toilet paper, and if defecation is associated with abdominal pain. Also, is important to inquire about soiling, which can be mistaken for diarrhea in some parents. Medications can be associated with constipation, such as opiates, sucralfate, antacids, among others. A psychosocial history is important to evaluate family structure, the number of members living at home and child relationship to them, interaction with his peers and possibility of abuse.

The physical exam should include an assessment of “alarm” signs and symptoms (in other words, fever, abdominal distention, anorexia, nausea, vomiting, weight loss, or poor weight gain). Bloody diarrhea in an infant with constipation could be an indication of a diagnosis such as Hirschsprung disease. On abdominal examination, distention or a palpable “mass” may be appreciated in the lower abdomen. A rectal exam should be performed to identify the presence of impacted stool or intrarectal mass. Visual and digital anal inspection to ensure normal size and positioning of the anal opening and to assess for rectal prolapse.

Evaluation

The routine use of any specific imaging or laboratory test in the diagnosis of pediatric functional constipation is not recommended. However, when symptoms fail to improve with a conventional medical approach, the further diagnostic evaluation may clarify possible causes and help guide therapy. Such diagnostic tests include anorectal manometry, colonic manometry, colonic transit studies and imaging such as x-ray and ultrasound.[7][8]

Anorectal manometry evaluates motor and sensory anorectal function to identify potential causes of constipation or fecal incontinence. Hirschsprung’s disease diagnosis is aid by this test, but gold standard diagnosis continues to be a rectal suction biopsy.

Colonic manometry consists of the colonoscopic insertion of a catheter throughout the length of the colon to measure segmental pressures. This diagnostic modality helps identify neurogenic and myogenic causes of constipation. There is no specific motility pattern is diagnostic of idiopathic constipation.

Colonic transit studies use radiopaque markers to assess the speed of intestinal transit. This can help identify anatomic sites of fecal retention and slow transit.

Overall, plain abdominal radiograph does not add to the history and physical exam. It may help to assess stool collection in the bowel when patients are obese, refuse a digital rectal exam, or when it is contraindicated. However, an abdominal radiograph is neither sensitive nor specific to diagnose constipation.

Treatment / Management

Management for constipation includes medical supervision, dietary instructions, behavioral changes and instructions regarding toilet training. A normal fiber intake, fluid intake, and physical activity level are recommended, and the routine use of prebiotics or probiotics is not recommended in the treatment of childhood constipation. The non-pharmacological intervention consists of demystification, explanation, and guidance for toilet training in those children with a developmental age of a least 4 years.[9][10][11]

Laxatives represent first-line treatment for childhood constipation and, if an adequate regimen is implemented, they often have a symptomatic improvement. Consensus guidelines recommend daily polyethylene glycol (PEG) at a dose of 1 to 1.5 gm/kg per day for 3 to 6 days for initial fecal disimpaction, followed by a daily maintenance dose of 0.4 gr/kg per day for at least 2 months to prevent re-accumulation. A stimulant laxative should be added if PEG alone does not cause disimpaction after 2 weeks of treatment.

Biofeedback has improved defecation dynamics but does not affect constipation. Hence this approach has not been supported for management of idiopathic constipation in children.

Sacral nerve stimulation is a modality that has been used to treat refractory constipation, helping extrinsic neural control of large bowel and modulating inhibitory reflexes. This has improved the defecation frequency in some children with functional constipation, but effects last less than 6 months in a large group of patients.

Surgical management is reserved for patients with refractory to medical interventions. At least 10% of children with functional constipation referred to a pediatric surgeon will require an operation. The surgical treatment goal is to produce symptom alleviation. Surgical options may include anal procedures, antegrade enemas, colorectal resection, and intestinal diversion.

Differential Diagnosis

Before making the diagnosis of functional constipation, these possible etiologies should be excluded: anorectal malformations, pelvic/rectal masses, rectal prolapse, rectocele, dysfunctional voiding, pelvic floor dyssynergia, internal anal sphincter hypertonicity or achalasia. Colorectal conditions should be ruled out, including visceral myopathies or neuropathies, as well as Hirschsprung disease. Systemic conditions, psychosocial issues, drugs or toxins need to be identified. Other conditions to explore include spinal cord anomalies, cystic fibrosis, connective tissue disorders, hypothyroidism, DM, hypercalcemia, hypokalemia, Celiac disease, cow’s milk protein allergy.

Prognosis

Most pediatric patients are managed with medical therapy, and most of them will improve. However, at least 30% will persist to be symptomatic until adulthood. Factors that are associated with a worse prognosis are female gender, older age of onset, longer time between symptom presentation and starting therapy, and longer colonic transit time.

Complications

  • Abdominal discomfort or cramps
  • Poor quality of life
  • Hemorrhoids
  • Anal fissures
  • Damage to the pelvic floor
  • Fecal incontinence
  • Urinary retention
  • Stercoral perforation
  • Volvulus

Enhancing Healthcare Team Outcomes

Constipation is seen in patients of all ages and the causes are diverse-hence the disorder is best managed in a multidisciplinary fashion. It is important to educate the patient on the importance of fiber in the diet. In addition, the patient must be told to refrain from using laxatives, drugs that cause constipation and participate in regular exercise. For those habituated to laxatives, a gastroenterology consult is necessary.[12][13]

Outcomes

Once constipation is diagnosed, compliance with the diet and medical therapy is essential to reverse the disorder. However, in many people recurrence of constipation is common and this is chiefly due to lack of compliance with the diet. A significant number of people can become disabled because of chronic constipation, and the quality of life can be poor. A few patients who fail to respond to medical management may need to undergo total abdominal colectomy; however, patient selection is vital in order to get a good outcome. The most difficult patients are those addicted to laxatives, who will not change their lifestyle and continue to use a variety of laxatives.[2][14]


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Constipation - Questions

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What is the mechanism of action of psyllium fiber when used as a laxative?



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A 55-year-old presents with constipation. He says he wants a medication so he can get better right away. In the history, what is the most important information to retrieve?



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Which lifestyle factor affects the development of constipation the most?



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In a patient with new onset constipation of 3 weeks duration, what is the first treatment plan?



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Which is FALSE about idiopathic slow transit constipation?



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A patient had a hemorrhoidectomy. To soften and lubricate the first postoperative bowel movement which of the following stool softeners would be used?



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Which of the following about constipation is NOT correct?



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Which of the following rarely causes of constipation in the elderly?



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Which of the following is least likely to cause constipation?



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What is the most common etiology for chronic constipation in elderly patients?



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What is the main focus of medical care concerning constipation?



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Which of the following is useful in the treatment of chronic constipation?



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Which of the following is the biggest contributor to constipation?



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Which is not recommended as a regular prevention or treatment for constipation?



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Which is the best initial test to investigate a patient with suspected opioid-induced constipation?



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A 71-year-old male presents to the office for evaluation of dyspnea. He has mild chronic obstructive pulmonary disease, which has been well controlled with inhalers. An echocardiogram and chest x-ray done 2 months ago were normal. He has a 20 pack-year smoking history and quit smoking 30 years ago. The review of systems is positive for dyspnea and new onset constipation. He is a retired truck driver. The family history is noncontributory, and the physical examination is normal. What is the best next step in evaluation?



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An elderly patient presents to the emergency department with complaints of constipation. Which of the following signs and symptoms would be expected? Select all that apply.



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Which of the following endocrinologic or metabolic conditions can cause constipation? Select all that apply.



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An elderly client suddenly develops severe constipation while in the hospital. The provider suspects this is most likely due to the client's currently prescribed home medications. Which of the following can cause constipation in the elderly? Select all that apply.



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Which of the following is a potential complication of chronic constipation? Select all that apply.



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A 15-year-old male comes for a chief complaint of constipation. He has been having constipation for the last two years. He complains of occasional periumbilical pain with no history of vomiting, weight loss, fever, or blood or mucus with the stool. On physical examination, abdominal palpation reveals stool on the right side. On per rectal examination, there is hard stool in the rectum. What is the next best step?



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Mother comes to your clinic with a 6-month-old child with chief complaints of constipation. She reports the patient started with constipation for the last three weeks. He has been passing hard pellet like stools. On physical examination, he is at the 56th percentile for weight. The rest of the physical examination is normal. He has been transitioned to a solid diet including rice cereal in the last one month. What would be the next step?



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Constipation - References

References

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Almario CV,Ballal ML,Chey WD,Nordstrom C,Khanna D,Spiegel BMR, Burden of Gastrointestinal Symptoms in the United States: Results of a Nationally Representative Survey of Over 71,000 Americans. The American journal of gastroenterology. 2018 Oct 15     [PubMed]
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Martinez de Andino N, Current treatment paradigm and landscape for the management of chronic idiopathic constipation in adults: Focus on plecanatide. Journal of the American Association of Nurse Practitioners. 2018 Jul     [PubMed]
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Veiga DR,Mendonça L,Sampaio R,Lopes JC,Azevedo LF, Incidence and Health Related Quality of Life of Opioid-Induced Constipation in Chronic Noncancer Pain Patients: A Prospective Multicentre Cohort Study. Pain research and treatment. 2018     [PubMed]
Osuafor CN,Enduluri SL,Travers E,Bennett AM,Deveney E,Ali S,McCarthy F,Fan CW, Preventing and managing constipation in older inpatients. International journal of health care quality assurance. 2018 Jun 11     [PubMed]
Iqbal F,van der Ploeg V,Adaba F,Askari A,Murphy J,Nicholls RJ,Vaizey C, Patient-Reported Outcome After Ostomy Surgery for Chronic Constipation. Journal of wound, ostomy, and continence nursing : official publication of The Wound, Ostomy and Continence Nurses Society. 2018 Jul/Aug     [PubMed]

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