conquering constipation by rachel hill, rn, msn lpn2007, july/august 2007 2.0 ancc/aacn contact...
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Conquering Constipation
By Rachel Hill, RN, MSNLPN2007, July/August 20072.0 ANCC/AACN contact hoursOnline: www.nursingcenter.com
© 2007 by Lippincott Williams & Wilkins. All world rights reserved.
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Constipation Statistics
estimated prevalence from 2% to 28%
incidence increases with age
as high as 20% in older adults
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Constipation Defined
infrequent or irregular defecation (less than three times/week)
hardened stool that’s difficult to pass
decreased stool volume or stool retention
feeling of incomplete bowel evacuation
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Constipation Defined
colon absorbs too much water
colon’s muscle contractions become sluggish
causes stool pass too slowly
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“Primary” Constipation
Caused by problems that affect the bowels immobility ■ overuse of laxatives
low-fiber diet ■ ignoring urge to defecate
inadequate fluid intake ■ changes in routine
lack of regular exercise ■ stress
pregnancy
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“Primary” Constipation
May be caused by medications opioids ■ antidepressants
tranquilizers ■ antihypertensives
anticholinergics ■ antacids with aluminum
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“Secondary” Constipation
Caused by rectal or anal disorders hemorrhoids or fissures
bowel obstruction
metabolic,neurologic, or neuromuscular diseases (diabetes, Parkinson's, MS)
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“Secondary” Constipation
endocrine disorders (hypothyroidism)
connective tissue disorders (lupus)
colon disease (irritable bowel sydrome, diverticulitis)
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Constipation in Older Adults
Adults age 65 and older present more frequently because:
Loose-fitting dentures or loss of teeth makes chewing difficult, leading the patient to choose soft, processed foods that are low in fiber.
Convenience foods, also low in fiber, are used by those who’ve lost interest in or have difficulty with eating.
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Constipation in Older Adults
Some older patients reduce fluid intake if not eating regular meals, don’t have the ability to get their own drinks, or fear frequent bathroom trips.
Lack of exercise and prolonged bed rest decrease abdominal muscle tone, anal sphincter tone, intestinal motility.
Nerve impulses decrease with age, decreasing sensation of urge to defecate.
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Chronic Constipation
Regularly ignoring the urge to go.
Rectal mucous membranes and muscles become insensitive to presence of fecal mass.
Stool is retained, colon becomes irritated, can cause abdominal pain.
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Signs & Symptoms of ConstipationTwo or more of the following over more than three
months = constipation abdominal distention, bloating, or pain
gurgling, rumbling bowel sounds
indigestion
nausea and vomiting
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Signs & Symptoms of Constipation decreased appetite
headache
fatigue
sensation of incomplete evacuation at least 25% of the time
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Signs & Symptoms of Constipation sensation of fullness at least 25% of the time
need to strain during a bowel movement at least 25% of the time
elimination of small, hard, dry stool at least 20% of the time
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Complications of Constipation hemorrhoids
fecal impaction
bowel obstruction
bowel perforation
electrolyte imbalances
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Complications of Constipation chronic constipation linked with increased incidence of
colon and rectal cancer
straining results in Valsalva maneuver, increases systemic blood pressure
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Assessing Constipation
Obtain detailed health history.
Ask about exercise and activity level, normal fluid
intake, diet.
Ask about normal bowel routine.
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Diagnostic Tests
digital rectal exam
stool for occult blood
bowel transit study
abdominal X-ray
sigmoidoscopy
barium enema
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Treatment
increasing fiber and fluid intake
bowel habit training
possible short-term laxative use
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Laxatives to Manage ConstipationPsyllium (Metamucil) Classification: Bulk-forming.
Action: Polysaccharides and cellulose derivatives mix with intestinal fluids, swell, and stimulate peristalsis.
Patient Education: Take with 8 oz. water; follow with 8 oz. water. Don’t take dry. Report abdominal distension or unusual amount of gas.
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Laxatives to Manage ConstipationMagnesium hydroxide (milk of magnesia) Classification: Saline agent
Action: Nonabsorbable magnesium ions alter stool consistency by drawing water into intestines by osmosis; peristalsis is stimulated. Action occurs within 2 hours.
Patient Education: Liquid more effective than tablet. Only short-term use recommended due to toxicity. Should not be taken by patients with renal insufficiency.
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Laxatives to Manage ConstipationMineral oil Classification: Lubricant
Action: Nonabsorbable hydrocarbons soften fecal matter by lubricating intestinal mucosa. Action occurs within 6 to 8 hours.
Patient Education: Don’t take with meals; can impair absorption of fat-soluble vitamins, delay gastric emptying. Swallow carefully.
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Laxatives to Manage ConstipationBisacodyl (Dulcolax) Classification: Stimulant
Action: Irritates colon epithelium by stimulating sensory nerve endings, increasing mucosal secretions. Action occurs within 6 to 8 hours.
Patient Education: Catharsis may cause fluid and electrolyte imbalance, especially in elderly. Swallow tablets; do not crush or chew. Avoid milk or antacids within 1 hour; enteric coating may dissolve prematurely.
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Laxatives to Manage ConstipationDocusate sodium (Colace) Classification: Fecal softener
Action: Hydrates stool by surfactant action on colonic epithelium; aqueous and fatty substances are mixed. Doesn’t exert laxative action.
Patient Education: Can be used safely by patients who should avoid straining.
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Laxatives to Manage ConstipationPolyethylene glycol and electrolytes (Colyte) Classification: Osmotic
Action: Rapidly cleanses colon; induces diarrhea.
Patient Education: Large volume product, takes time to consume safely. Can cause considerable nausea, bloating.
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Adverse Effects of Laxatives
nausea and vomiting
abdominal cramps
weakness
diarrhea
electrolyte imbalances
dizziness
confusion
sweating
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Risks of Chronic Laxative Use in Older Adults increased constipation
diarrhea
elevated magnesium
elevated phosphate
lower albumin levels
poor response to bowel preparation for barium enema
increased risk of fecal impaction