Feeding Tubes in Patients with Severe Dementia

Am Fam Physician. 2002 Apr 15;65(8):1605-1611.

Patients with advanced dementia are among the most challenging patients to care for because they are often bedridden and dependent in all activities of daily living. Difficulty with eating is especially prominent and distresses family members and health care professionals. Health care professionals commonly rely on feeding tubes to supply nutrition to these severely demented patients. However, various studies have not shown use of feeding tubes to be effective in preventing malnutrition. Furthermore, they have not been demonstrated to prevent the occurrence or increase the healing of pressure sores, prevent aspiration pneumonia, provide comfort, improve functional status, or extend life. High complication rates, increased use of restraints, and other adverse effects further increase the burden of feeding tubes in severely demented patients. Feeding tubes should be avoided in many situations in which they are currently used. The preferable alternative to tube feeding is hand feeding. Though it may not be effective in preventing malnutrition and dehydration, hand feeding allows the maintenance of patient comfort and intimate patient care.

The use of artificial nutrition and hydration in patients in the final stages of dementia is a controversial and emotional issue. This topic will become increasingly important because the prevalence of dementia will continue to rise as the population ages. The most common form of dementia is Alzheimer's disease, and its prevalence will nearly quadruple in the next 50 years, by which time approximately one in 45 Americans will have the disease.1 In the end stages of dementia, patients are typically incapable of having relationships with other people, bedridden, incontinent, and unable to eat and drink for various reasons. Problematic eating patterns may include indifference to food, refusal of food, or failure to manage the food bolus properly once it is in the mouth.2,3

Family members and physicians are often attracted to the perceived benefits of providing artificial nutrition and hydration to patients with severe dementia. These techniques have been promoted as a method to improve nutrition, maintain skin integrity by enhanced protein intake, prevent aspiration pneumonia, minimize suffering, improve functional status, and extend life. Additionally, providing artificial nutrition and hydration has been associated with caring and nurturing whereas forgoing these measures has been equated with neglect and abandonment.4,5 Thus, when caretakers are faced with the decision of whether or not to provide artificial nutrition and hydration, it seems sensible to provide it by any means. Percutaneous endoscopic gastrostomy (PEG) tubes often have been used for this purpose, and it is estimated that approximately 30 percent of all PEG tubes are placed in patients with dementia.6

Unfortunately, most of the data regarding feeding tubes in severely demented patients are based on observational studies, retrospective studies, or data extrapolated from mixed populations. These factors may significantly confound the ability to appropriately assess the risks and benefits of feeding tube placement. Variability in aspiration pneumonia, functional status, and mortality rates may be related to differences in patient cohorts. Patients who receive feeding tubes may be more debilitated than those who do not.

Another major research obstacle is the designation of an appropriate control group.2,7 For example, results may vary if patients in the control group were hand-fed by loving family members versus nursing assistants in long-term care settings. Past studies are further confounded by the fact that the stage at which tube feeds are initiated varies among patients because there is no standard guideline for this procedure. In the absence of unequivocal evidence that demonstrates the positive or negative consequences of tube feeding, patients, family members, and physicians may still feel that the insertion of a feeding tube is appropriate.8

Despite these limitations, studies have shown that feeding tubes are of unproved benefit in ensuring adequate nutrition, preventing pressure sores, preventing aspiration pneumonia, providing comfort, improving functional status, or extending life in patients with advanced dementia. The procedure can be burdensome through tube-related complications and the use of restraints.

This article will examine whether artificial nutrition and hydration in patients with severe dementia actually provide the assumed medical benefits associated with them.

Malnutrition

Demented patients who stop eating become malnourished rapidly. Development of abnormal markers of nutritional status are often used to justify feeding-tube placement in the belief that tube feeding would help prevent the consequences of malnutrition, which include pressure sores, infection, and death.

A sample9 of 40 chronically tube-fed patients with poor functional and cognitive status demonstrated that weight loss, severe depletion of lean and fat body mass, and micronutrient deficiencies persisted even if generous amounts of standard enteral formulas were provided. [Evidence level B: clinical cohort study] Other studies have demonstrated that weight loss increased in amount and frequency as the duration of the tube feeding lengthened.10,11 Other nutritional markers such as hemoglobin, hematocrit, albumin, and cholesterol levels also did not show any significant improvement after a feeding tube was placed.10,11

The persistent malnutrition in these chronically tube-fed patients in the face of adequate amounts of formula suggest that “the long-term effects of chronic disease, immobility, and neurologic defects may undermine attempts at long-term nutritional support.”9 Negative outcomes may be unavoidable in these patients despite tube feeding.

Pressure Sores

The data linking malnutrition to the development or worsening of pressure sores are limited. Two retrospective cohort studies12,13 did demonstrate that during six months of follow-up, poor oral intake was associated with non-healing pre-existing pressure sores and the formation of new pressure sores. Malnutrition is often cited as a risk factor for developing pressure sores, and feeding tubes are often placed to improve nutritional status and theoretically improve skin integrity. However, one retrospective study14 observed that the incidence of decubitus ulcers was not statistically different between those patients with (21 percent) and without (13 percent) feeding tubes.

A MEDLINE search15 from 1985 to 1994 was performed to review the relationship between malnutrition and pressure sores and to gauge the effectiveness of tube feeding in improving the outcomes of pressure sores. The conclusion suggests that the data linking malnutrition and the development of pressures sores were incomplete and contradictory and that “the routine use of tube feeding to prevent or treat pressure sores is not clearly supported by data.”15 In a follow-up review,2 there were still no data to support the use of feeding tubes to improve pressure sores.

Aspiration Pneumonia

Interrupting the cycle of eating, aspiration, and subsequent pneumonia is one of the most commonly cited reasons for using a feeding tube. However, there are no data that show feeding tubes reduce the risk of aspiration pneumonia in patients with dementia.7,16 In fact, some data have shown that the risk of aspiration is increased. One study14 examining the risk of aspiration pneumonia in 104 severely demented nursing home patients found that patients with feeding tubes experienced significantly more episodes of aspiration pneumonia (58 percent) than the patients without feeding tubes (17 percent; P < 0.01).

In assessing whether one site of feeding tube placement was superior to others, investigators compared the incidence of aspiration between patients with jejunostomy tubes and those with gastrostomy tubes. A meta-analysis17 of 45 studies between 1978 and 1989 with a total of 2,976 gastric tubes and 386 jejunal tubes found that aspiration rates were highly variable across different patient populations and studies. The authors concluded that there were no data to demonstrate decreased risk of aspiration at one feeding tube site compared with another.17 The continued risk of aspiration despite feeding tube placement may result from continued reflux of gastric contents and aspiration of oropharyngeal secretions.18

Quality of Life

Caretakers and physicians often project sensations of hunger and thirst onto severely demented patients with poor oral intake. “We can't just let him starve to death,” is a common refrain heard from family members. Clearly, it is impossible to ask patients suffering from severe dementia if they are truly uncomfortable in such a state. Data about thirst and hunger can be extrapolated from patients dying with other terminal illnesses.

One study19 surveyed 32 patients dying of cancer and stroke. The patients had anorexia or profound dysphagia, and they retained sufficient awareness to express sensations of hunger and thirst at least 75 percent of the time from initial admission until their death. All those who experienced hunger received small amounts of food for alleviation. Patients who complained of thirst and dry mouth were given mouth swabs, sips of water, ice chips, and lubrication of the lips. It is important to mention that the amount given to attempt to alleviate these symptoms was much less than the amount needed to replenish losses. Interestingly, an overwhelming majority of these patients (84 percent) reported that their thirst and hunger were successfully alleviated by these minimal interventions.

In another prospective study,20 there were no significant differences in the mean patient comfort scores between the predehydration and dehydration phases. [Evidence level B: clinical cohort study] A perfect comfort score was realized in 85 percent of cases. The results of these studies suggest that patients with a terminal illness can experience comfort despite minimal intake of food and fluids.

Functional Status and Survival

Artificial nutrition and hydration are often provided to improve functional status and survival. Currently, there are limited data about the impact of feeding tubes on improving functional status in patients with advanced dementia. One retrospective observation11 of nursing home residents who received feeding tubes found no improvement in bowel and bladder function, mental status, speech, activities of daily living, or ambulation during the 18 months after PEG tube placement. Patients in one community-based study21 did experience some improvement in upper and lower body function over a period of four months.

Patients and their surrogate decision makers often expect the prolongation of life to be the outcome of feeding-tube placement.8 A few cohort studies22,23 comparing nursing home residents with and without feeding tubes have not shown a survival advantage in patients with feeding tubes. [References22 and 23, Evidence level B: clinical cohort study] In a recent MEDLINE review,24 only 38 percent of the patients were alive one year after placement of a feeding tube. For acutely ill patients with severe dementia, there was no survival advantage among patients who received a feeding tube during their index hospitalization, compared with those without a feeding tube.25 With or without a feeding tube, these patients have a 50 percent six-month median mortality rate. Perhaps the inability to eat marks the point at which the patient has entered the final stages of the illness that may be intractable even in the face of aggressive intervention. This would account for the lack of improvement in functional status and survival rates.

Other Considerations

Nonclinical factors may greatly influence the ultimate decision of placing a feeding tube. Clinicians may fear that they are more vulnerable to legal action if they do not place a feeding tube in a terminally ill patient. A physician may fear that not having a feeding tube in a cachectic patient with progressive weight loss and bedsores will insinuate neglect and have negative legal consequences. The alternative to tube feeding is hand feeding, which is time consuming and labor intensive. Nursing homes may not be willing to devote more time to each patient, especially without financial compensation. This may explain why residence in a nursing home is associated with an increased risk of receiving a new feeding tube.25

Patients with end-stage dementia often rely on surrogate decision makers to decide if a feeding tube should be placed. Hopefully, an advance directive would be in place to represent the patient's wishes. In many cases, no such instructions are available. Patients or their surrogates who choose tube feedings may feel that denying a demented person the provision of nutrition and hydration is morally wrong. This belief may be grounded in their cultural or religious background. It is important to be sensitive to all of these variables because they will influence the decision of whether or not a feeding tube is inserted.

Placing a feeding tube may increase patient suffering. The mortality rate related to the placement of the PEG tube is generally low, ranging from zero to 2 percent.3 However, the complication rates of PEG tube placement can range from 15 to 70 percent.2,6,10,11,2628  Tube leakage, cellulitis, gastroesophageal reflux, ileus, and diarrhea are all possible adverse consequences associated with use of a feeding tube and can cause extreme discomfort to patients (Table 1).2,6,10,11,2628

TABLE 1

Potential Complications Related to Percutaneous Endoscopic Gastrostomy Tubes

Category Complications

Local

Local pain

Suture breakage

Cellulitis of the abdominal wall

Abscess of the abdominal wall

Stomal inflammation

Skin excoriation

Bleeding from the site

Closure or stenosis of stoma

Hematoma

Mechanical

Erosion of bumper into abdominal wall

Tube leakage

Tube blockage

Tube migration or loose fixation plate

Tube malfunction

Fractured tube

Kinked tube

Pleuropulmonary

Erosion of tube into pleural cavity

Aspiration pneumonia

Gastrointestinal

Flatulence

Nausea

Vomiting

Diarrhea

Ileus

Gastroesophageal reflux

Bowel obstruction (requiring laparotomy)

Intra-abdominal leak

Intra-abdominal peritonitis

Intra-abdominal bleeding

Gastric mucosal erosion

Gastric perforation

Upper gastrointestinal bleed

Necrotizing fasciitis

Other

Anorexia

Fluid overload

Increased skin moisture

Agitation, self-extubation

Use of restraints

Metabolic disturbances

Loss of social aspects of feeding

Altered cosmesis

Fever

Sepsis


Information from references 2, 6, 10, 11, and 26 through 28.

TABLE 1   Potential Complications Related to Percutaneous Endoscopic Gastrostomy Tubes

View Table

TABLE 1

Potential Complications Related to Percutaneous Endoscopic Gastrostomy Tubes

Category Complications

Local

Local pain

Suture breakage

Cellulitis of the abdominal wall

Abscess of the abdominal wall

Stomal inflammation

Skin excoriation

Bleeding from the site

Closure or stenosis of stoma

Hematoma

Mechanical

Erosion of bumper into abdominal wall

Tube leakage

Tube blockage

Tube migration or loose fixation plate

Tube malfunction

Fractured tube

Kinked tube

Pleuropulmonary

Erosion of tube into pleural cavity

Aspiration pneumonia

Gastrointestinal

Flatulence

Nausea

Vomiting

Diarrhea

Ileus

Gastroesophageal reflux

Bowel obstruction (requiring laparotomy)

Intra-abdominal leak

Intra-abdominal peritonitis

Intra-abdominal bleeding

Gastric mucosal erosion

Gastric perforation

Upper gastrointestinal bleed

Necrotizing fasciitis

Other

Anorexia

Fluid overload

Increased skin moisture

Agitation, self-extubation

Use of restraints

Metabolic disturbances

Loss of social aspects of feeding

Altered cosmesis

Fever

Sepsis


Information from references 2, 6, 10, 11, and 26 through 28.

Another potential adverse consequence of tube feeding is the increased use of restraints. Patients with severe dementia often do not understand why a tube is protruding from their abdominal wall, and they frequently attempt to pull it out.29 Caretakers often respond by ordering restraints. One study14 found that severely demented patients with feeding tubes were 90 percent more likely to have their hands enclosed in “mittens,” and 71 percent of these patients required additional restraints. This action often causes the patient to become more agitated, which may lead to the use of pharmacologic sedation.29 With such potential negative outcomes as tube dysfunctions and increased use of restraints, tube feeding may actually result in more suffering than comfort.

Caretakers should be encouraged to hand-feed patients instead of placing feeding tubes. The patient's oral intake may increase by altering flavors, amounts, consistency, and availability of food (Table 2).5,13,3033 If hand feeding is failing, tube feeding should not be the next “logical” choice. Every effort should be made to educate caretakers about the benefits and risks concerning tube feeding of severely demented individuals. Caretakers need to be reminded that advanced dementia is a terminal illness and that patients with severe dementia can be comfortable without feeding tubes in place. If a feeding tube is instituted, this intervention should be made with highly specific goals in mind. If a complication ensues or the goals are not met after a specified period of time, then withdrawing the feeding tube should be considered.5

TABLE 2

Recommendations for Oral Feeding in Patients with Severe Dementia

Preventing aspiration pneumonia for those patients at risk

Sit the patient upright (45 degrees) while eating

Bolus size of less than one teaspoon

Restrict clear liquids

Place food well into the mouth

Encourage gentle coughs after each swallow

Remind to swallow multiple times after each mouthful of food to clear the pharynx

Strategies to improve food intake

Basic tenet: Alter flavors, amounts, consistency, and availability of food.

Use strong flavors

Hot or cold (not tepid)

Gravy

Juices

Enrichers (e.g., cream, spices)

Sweets (e.g., miniature chocolate bars)

Use varying amounts of food

Try finger foods (e.g., sandwiches, chicken fingers)

Use preferred foods in large quantities (e.g., ice cream)

Adapt food consistency to suit the individual

Try liquid supplements (Should be given one and one half to two hours before the next meal; should never be given with the meal as it can promote satiety)

Try slightly thickened food (e.g., puddings, milkshakes)

Try blending foods (e.g., cereals mixed with eggnog or pudding)

Make food available to the patient

Lengthen mealtimes because it takes longer for demented patients to ingest, chew, and swallow food

Allow patients to keep their supplements (e.g., liquid supplements and/or candy bars) at the bedside

Modify environmental factors

Capitalize on the midday meal when patients demonstrate maximal cognitive function

For those resistive or combative at mealtime, try holding hands or reassuring touches on the arms, or try cheerful conversations or singing softly


Information from references 5, 13, and 30 through 33.

TABLE 2   Recommendations for Oral Feeding in Patients with Severe Dementia

View Table

TABLE 2

Recommendations for Oral Feeding in Patients with Severe Dementia

Preventing aspiration pneumonia for those patients at risk

Sit the patient upright (45 degrees) while eating

Bolus size of less than one teaspoon

Restrict clear liquids

Place food well into the mouth

Encourage gentle coughs after each swallow

Remind to swallow multiple times after each mouthful of food to clear the pharynx

Strategies to improve food intake

Basic tenet: Alter flavors, amounts, consistency, and availability of food.

Use strong flavors

Hot or cold (not tepid)

Gravy

Juices

Enrichers (e.g., cream, spices)

Sweets (e.g., miniature chocolate bars)

Use varying amounts of food

Try finger foods (e.g., sandwiches, chicken fingers)

Use preferred foods in large quantities (e.g., ice cream)

Adapt food consistency to suit the individual

Try liquid supplements (Should be given one and one half to two hours before the next meal; should never be given with the meal as it can promote satiety)

Try slightly thickened food (e.g., puddings, milkshakes)

Try blending foods (e.g., cereals mixed with eggnog or pudding)

Make food available to the patient

Lengthen mealtimes because it takes longer for demented patients to ingest, chew, and swallow food

Allow patients to keep their supplements (e.g., liquid supplements and/or candy bars) at the bedside

Modify environmental factors

Capitalize on the midday meal when patients demonstrate maximal cognitive function

For those resistive or combative at mealtime, try holding hands or reassuring touches on the arms, or try cheerful conversations or singing softly


Information from references 5, 13, and 30 through 33.

The Author

INA LI, M.D., is an instructor in the family medicine department at Thomas Jefferson University Hospital, Philadelphia. She received her medical degree from the University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Piscataway, N.J. Dr. Li completed a residency in family medicine and a fellowship in geriatrics at Thomas Jefferson University Hospital.

Address correspondence to Ina Li, M.D., Dept. of Family Medicine, 1015 Walnut St., Curtis Bldg., Suite 401, Philadelphia, PA 19107 (e-mail: kostali@mindspring.com). Reprints are not available from the author.

The author indicates that she does not have any conflicts of interest. Sources of funding: none reported.

REFERENCES

1. Brookmeyer R, Gray S, Kawas C. Projections of Alzheimer's disease in the United States and the public health impact of delaying disease onset. Am J Public Health. 1998;88:1337–42.

2. Finucane TE, Christmas C, Travis K. Tube feeding in patients with advanced dementia: a review of the evidence. JAMA. 1999;282:1365–70.

3. Finucane TE. Tube feeding in the demented elderly: a review of the evidence. American Geriatrics Society Annual Scientific Meeting 2001. Retrieved December 2001, from: http://www.medscape.com/Medscape/CNO/2001/AGS/AGS-01.html.

4. Slomka J. What do apple pie and motherhood have to do with feeding tubes and caring for the patient? Arch Intern Med. 1995;155:1258–63.

5. McCann R. Lack of evidence about tube feeding—food for thought. JAMA. 1999;282:1380–1.

6. Rabeneck L, Wray NP, Petersen NJ. Long-term outcomes of patients receiving percutaneous endoscopic gastrostomy tubes. J Gen Intern Med. 1996;11:287–93.

7. Finucane TE, Bynum JP. Use of tube feeding to prevent aspiration pneumonia. Lancet. 1996;348:1421–4.

8. Callahan CM, Haag KM, Buchanan NN, Nisi R. Decision-making for percutaneous endoscopic gastrostomy among older adults in a community setting. J Am Geriatr Soc. 1999;47:1105–9.

9. Henderson CT, Trumbore LS, Mobarhan S, Benya R, Miles TP. Prolonged tube feeding in long-term care: nutritional status and clinical outcomes. J Am Coll Nutr. 1992;11:309–25.

10. Ciocon JO, Silverstone FA, Graver LM, Foley CJ. Tube feedings in elderly patients. Indications, benefits, and complications. Arch Intern Med. 1988;148:429–33.

11. Kaw M, Sekas G. Long-term follow-up of consequences of percutaneous endoscopic gastrostomy (PEG) tubes in nursing home patients. Dig Dis Sci. 1994;39:738–43.

12. Berlowitz DR, Ash AS, Brandeis GH, Brand HK, Halpern JL, Moskowitz MA. Rating long-term care facilities on pressure ulcer development: importance of case-mix adjustment. Ann Intern Med. 1996;124:557–63.

13. Berlowitz DR, Brandeis GH, Anderson J, Brand HK. Predictors of pressure ulcer healing among long-term care residents. J Am Geriatr Soc. 1997;45:30–4.

14. Peck A, Cohen CE, Mulvihill MN. Long-term enteral feeding of aged demented nursing home patients. J Am Geriatr Soc. 1990;38:1195–8.

15. Finucane TE. Malnutrition, tube feeding and pressure sores: data are incomplete. J Am Geriatr Soc. 1995;43:447–51.

16. Bourdel-Marchasson I, Dumas F, Pinganaud G, Emeriau JP, Decamps A. Audit of percutaneous endoscopic gastrostomy in long-term enteral feeding in a nursing home. Int J Qual Health Care. 1997;9:297–302.

17. Lazarus BA, Murphy JB, Culpepper L. Aspiration associated with long-term gastric versus jejunal feeding: a critical analysis of the literature. Arch Phys Med Rehabil. 1990;71:46–53.

18. Valles J, Artigas A, Rello J, Bonsoms N, Fontanals D, Blanch L, et al. Continuous aspiration of subglottic secretions in preventing ventilator-associated pneumonia. Ann Intern Med. 1995;122:179–86.

19. McCann RM, Hall WJ, Groth-Juncker A. Comfort care for terminally ill patients. The appropriate use of nutrition and hydration. JAMA. 1994;272:1263–6.

20. Vullo-Navich K, Smith S, Andrews M, Levine AM, Tischler JF, Veglia JM. Comfort and incidence of abnormal serum sodium, BUN, creatinine and osmolality in dehydration of terminal illness. Am J Hosp Palliat Care. 1998;15:77–84.

21. Callahan CM, Haag KM, Weinberger M, Tierney WM, Buchanan NN, Stump TE, et al. Outcome of percutaneous endoscopic gastrostomy among older adults in a community setting. J Am Geriatr Soc. 2000;48:1048–54.

22. Mitchell SL, Kiely DK, Lipsitz LA. The risk factors and impact on survival of feeding tube placement in nursing home residents with severe cognitive impairment. Arch Intern Med. 1997;157:327–32.

23. Mitchell SL, Kiely DK, Lipsitz LA. Does artificial enteral nutrition prolong the survival of institutionalized elders with chewing and swallowing problems? J Gerontol A Biol Sci Med Sci. 1998;53:M207–13.

24. Mitchell SL, Tetroe JM. Survival after percutaneous endoscopic gastrostomy placement in older persons. J Gerontol A Biol Sci Med Sci. 2000;55:M735–9.

25. Meier DE, Ahronheim JC, Morris J, Baskin-Lyons S, Morrison RS. High short-term mortality in hospitalized patients with advanced dementia: lack of benefit of tube feeding. Arch Intern Med. 2001;161:594–9.

26. Madan AK, Batra AK. Percutaneous endoscopic gastrostomy in the elderly: complications (review). J Nutr Elder. 1996;15:39–49.

27. Taylor CA, Larson DE, Ballard DJ, Bergstrom LR, Silverstein MD, Zinsmeister AR, et al. Predictors of outcome after percutaneous endoscopic gastrostomy: a community-based study. Mayo Clin Proc. 1992;67:1042–9.

28. Loser C, Wolters S, Folson UR. Enteral long-term nutrition via percutaneous endoscopic gastrostomy (PEG) in 210 patients: a four-year prospective study. Dig Dis Sci. 1998;43:2549–57.

29. Gillick MR. Rethinking the role of tube feeding in patients with advanced dementia. N Engl J Med. 2000;342:206–10.

30. Soltesz KS, Dayton JH. Finger foods help those with Alzheimer's maintain weight. J Am Diet Assoc. 1993;93:1106–8.

31. Winograd CH, Brown EM. Aggressive oral refeeding in hospitalized patients. Am J Clin Nutr. 1990;52:967–8.

32. Horner J, Massey EW, Riski JE, Lathrop DL, Chase KN. Aspiration following stroke: clinical correlates and outcome. Neurology. 1988;38:1359–62.

33. Suski NS, Nielsen CC. Factors affecting food intake of women with Alzheimer's type dementia in long-term care. J Am Diet Assoc. 1989;89:1770–3.


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