In our society, the overwhelming majority of people living with serious illness are elderly. They spend years living with chronic diseases accompanied by multiple coexisting conditions, progressive dependency on others, and heavy care needs met mostly by family members. Abundant evidence suggests that the quality of life in the setting of serious illness is often poor, characterized by inadequately treated physical distress, fragmented care systems, poor to absent communication between doctors and patients and families, and enormous strains on family caregiver and support systems. In this chapter, we focus on the palliative care needs of older adults.
BIOLOGY OF AGING
Body Composition
Aging is a process that converts healthy adults into frail ones with diminished reserves in most physiologic systems and with an exponentially increasing vulnerability to most diseases and death (1). Aging is the most significant and common risk factor for disease in general. The process itself is a mystery, still poorly understood even in this age of advanced biotechnologic capability. Normal aging appears to be a fairly benign process. The body’s organ system reserves and homeostatic control mechanisms steadily decline. Commonly, this slow erosion only becomes obvious in times of maximum body stress or serious illness. However, as the process continues, it takes less and less insult for the underlying physiologic weakness to become apparent. It is difficult to differentiate the effects of aging alone from those of concurrent disease or environmental factors. Eventually, a critical point is reached, when the body’s systems are overwhelmed, and death ultimately results. Morbidity is often compressed into the last period of life (2).
Substantial changes occur in body composition with aging. These changes become important when related to nutritional needs, pharmacokinetics, and metabolic activity. As adults age, the proportion of bodily lipid doubles and lean body mass decreases. Bones and viscera shrink and the basal metabolic rate declines. Although specific age-associated changes occur in each organ system, changes in body composition and metabolism are highly variable from individual to individual.
Renal Function
The aging kidney loses functioning nephrons. Crosssectional and longitudinal studies have also demonstrated a decline in creatinine clearance. There is also evidence to show decreased renal plasma flow, decreased tubular secretion and reabsorption, decreased hydrogen secretion, and decreased water absorption and excretion (3). When kidney disease complicates this aging process, the outcome can be highly deleterious.
Underlying renal function is an important issue in geriatric pharmacology. Many medications rely on the kidneys’ mechanisms for excretion and their metabolites may accumulate and lead to side effects or toxic injury in an impaired system. Commonly used medications are more likely to damage older kidneys, including nonsteroidal anti-inflammatory drugs (NSAIDs) and intravenous contrast dye (4).
Gastrointestinal and Hepatic Function
The gastrointestinal tract changes less with aging than other body systems, but there are still some deficiencies that may affect medication delivery and breakdown, as well as nutritional status and metabolism. The esophagus may show delayed transit time. The stomach may atrophy and produce less acid. Colonic transit is greatly slowed, whereas small intestinal transit appears unaffected. Pancreatic function is usually well maintained, although trypsin secretion may be decreased.
The liver usually retains adequate function, although there are variable changes seen in its metabolic pathways. The cytochrome P450 system may decline in efficiency and liver enzymes may be less inducible. The most significant change is the sharp decline in demethylization, the process that metabolizes medications such as benzodiazepines in the liver. This change may necessitate dosage adjustments. In addition, drugs that undergo hepatic first-pass metabolism by extraction from the blood may have altered clearance with increasing age because of decreased hepatic blood flow.
Brain and Central Nervous System Changes
The brain and central nervous system slowly atrophy with age. Neurons stop proliferating and are not replaced when they die, resulting in neuronal loss as well as loss of dendritic arborization. There are also some degree of neurotransmitter and receptor loss. The extent of this loss is not well understood.
Age-related changes in pain perception may exist, but their clinical importance is uncertain. Although degenerative changes occur in areas of the central and autonomic nervous system that mediate pain, the relevance of these changes has yet to be determined (5). Clinical observations from elderly patients who report minimal pain and discomfort despite the presence of cardiac ischemia or intraabdominal catastrophe suggest that pain perception may be altered in the elderly. However, experimental data suggest that significant, agerelated changes in pain perception probably do not occur (6). Until further studies conclusively demonstrate that the perception of pain decreases with age, stereotyping of most elderly patients as experiencing less pain may lead to inaccurate clinical assessments and needless suffering (5).
DEMOGRAPHY OF SERIOUS ILLNESS IN THE UNITED STATES
The median age at death in the United States is now 78 years and has been associated with a steady and linear decline in age-adjusted death rates since 1940. In 1900, life expectancy at birth was <50 years; a girl born today may expect to live to age 81 and a boy to age 76. Those reaching 65 years can expect to live another 18 years on average and those reaching age 80 can expect to live an additional 8 years. These unprecedented increases in life expectancy (equivalent to that occurring between the Stone Age and 1900) are due primarily to decreases in maternal and infant mortality, resulting from improved sanitation, nutrition, and effective control of infectious diseases. As a result, there has been an enormous growth in the number and health of the elderly. By the year 2030, 20% of the United States’ population will be over age 65, as compared with <5% at the turn of the 20th century (7).
Although death at the turn of the 20th century was largely attributable to acute infectious diseases or accidents, the leading causes of death today are chronic illness such as heart disease, cancer, stroke, and dementia. With advances in the treatment of atherosclerotic vascular disease and cancer, many patients with these diseases now survive for years. Many diseases that were rapidly fatal in the past have now become chronic illnesses.
In parallel, deaths that occurred at home in the early part of the 20th century now occur primarily in institutions— 68% of all deaths occur in hospitals or nursing homes (8). The reasons for this shift in location of death are complex, but appear to be related to health system and reimbursement structures that promote hospital-based care and provide relatively little support for home care and custodial care services despite the significant care burdens and functional dependency that accompany life-threatening chronic disease in the elderly. The older the patient, the higher the likelihood of death in a nursing home or hospital, with an estimated 76% of persons over 85 years experiencing an institutional death and a similar number spending at least some time in an institution in the year prior to death (8). These statistics, however, hide the fact that most of an older person’s last months and years are still spent at home in the care of family members, with hospitalization and/or nursing home placement occurring only near the very end of life. National statistics also obscure the variability in the experience of living with serious illness. For example, the need for institutionalization or paid formal caregivers in the last months of life is much higher among the poor and women. Similarly, persons suffering from cognitive impairment and dementia are much more likely to spend their last days in a nursing home compared with cognitively intact, elderly persons dying from nondementing illnesses.
CARE SYSTEMS FOR OLDER ADULTS WITH SERIOUS ILLNESS
The needs of older adults living with serious illness are not well matched by current models of care. Specifically, multiple studies demonstrate that the personal and practical care needs of patients who are seriously ill and their families are not adequately addressed by routine office visits or hospital and nursing home stays and that this failure results in substantial burdens—medical, psychological, and financial—on patients and their caregivers (9). Neither paid personal care services at home nor nursing home costs for the functionally dependent elderly are covered by Medicare, but instead are paid for approximately equally from out-of-pocket and Medicaid budgetary sources that were originally developed to provide care for the indigent. In the context of chronic progressive disease, the burden of coordinating an array of social and medical services falls on primary physicians and more often, individual families.
In response to the needs of seriously ill older adults and their families, palliative care teams have become increasingly prevalent in United States hospitals and provide comprehensive interdisciplinary care for seriously ill patients and families in collaboration and consultation with primary physicians. Over 80% of hospitals with over 300 beds now report a palliative care team and over two-third of all hospitals report a palliative care team—a steady 140% increase in prevalence since 2000 (10). Hospital palliative care teams have been shown to significantly reduce symptom burden, enhance patient and family satisfaction, and lower costs (Morrison nejm, health affairs, NEJM). Other programs, although less well developed, focused on reducing functional decline and delirium and improving transitions from hospitals also show promising early results (11).
In the ambulatory care setting, programs are less well developed than in hospitals. Hospice services, under the Medicare benefit, are available in most US communities and provide palliative care, primarily at home, for patients with a life expectancy of 6 months or less who are willing to forgo insurance coverage for life-prolonging treatments. Overall, about 40% older adults access their hospice benefit prior to death and median length of stay on hospice is on the order of 3 weeks (12). Reasons for the low rate of utilization of the Medicare Hospice Benefit vary by community but include the inhibiting requirements that patients acknowledge that they are dying in order to access the services, that physicians certify a prognosis of 6 months or less, and that very few hours (usually 4 or less) of personal care home attendants are covered under the benefit. In addition, the fiscal structure of the Medicare Hospice Benefit lends itself well to the predictable trajectory of late-stage cancers, but not so well to the unpredictable chronic course of other common causes of death in the elderly such as congestive heart failure, chronic lung disease, stroke, and dementing illnesses.
Other programs that coordinate care for patients who have complex illnesses, outside of hospice, are becoming increasingly available in many communities—primarily for younger adults or for individuals enrolled in Medicare Advantage (i.e., Medicare managed care plans). These programs typically focus on intensive telephonic case management and have been shown in early studies to improve care for those with serious illness (13). The quality, cost, and extent of the services provided are highly variable.
Finally, comprehensive multidisciplinary home care programs that serve frail older adults have been developed in several specialized settings. The Program of All-Inclusive Care for the Elderly (PACE) is a capitated Medicare and Medicaid benefit for frail older adults that offers comprehensive medical and social services at day health centers, in homes, and at inpatient facilities. Patients enrolled in PACE have higher rates of advance directive completion and lower rates of nursing home admission, hospitalization, and hospital deaths than do patients who do not use the services (ref Morrison NEJM). Similar programs of team-coordinated home-based care exist within the Veterans Administration (VA) (VA home-based primary care and VA palliative care programs). All VA hospitals are required to have both a home-based primary care program for homebound veterans and a palliative care team. Furthermore, under recent VA regulations, all veterans are allowed access to hospice at the same time as they are receiving disease-directed or curative treatments.
In nursing homes, the site of care for many of the most seriously ill and cognitively impaired older adults, incentives promoting palliative care standard are lacking. Indeed, nursing home quality metrics focus on improvement of function and maintenance of weight and nutritional status. Evidence of the decline that accompanies the dying process is typically regarded as a measure of substandard care (14). Therefore, a death in a nursing home is often viewed as evidence particularly by state regulators of poor care rather than an expected outcome for a frail, chronically ill, older person. The financial and regulatory incentives and quality measures that currently exist in long-term care promote tube feeding over spoon feeding and transfer to hospital or emergency department in the setting of acute illness or impending death (Table 62.1). They fail to either assess or reward appropriate attention to palliative measures, including relief of symptoms, spiritual care, and promotion of continuity with concomitant avoidance of brink-of-death emergency room and hospital transfers (15). Although provision of hospice services has been shown to improve quality in nursing homes (16), penetration of hospice services into most nursing homes remains low and increasing federal scrutiny on long-lengths of stay of nursing home residents on the hospice benefit has led to concerns about enrolling this patient population.
TABLE 62.1 Benefits and risks of tube feeding in older adults/nursing home residents
Benefits of Tube Feeding in Older Adults/Nursing Home Patients
Risks of Tube Feeding in Older Adults/Nursing Home Patients
Improved survival for patients in persistent vegetative state
Dementia patients more likely to be physically restrained
Improved survival for patients with extreme short bowel syndrome or proximal bowel obstruction
Increased risk of aspiration pneumonia, diarrhea, gastrointestinal discomfort, and problems associated with accidental feeding tube removal by the patient
Improved survival AND quality of life for patients with bulbar amyotrophic lateral sclerosis
With impaired renal function or in last days of life patient may have choking, increased pulmonary secretions, dyspnea, pulmonary edema, and ascites
Improved survival for patients in acute phase of stroke or head injury
Improved survival in patients receiving short-term critical care
Improved nutritional status of patients with advanced cancer undergoing intensive radiation therapy
No Survival Benefit in patients with dementia
Table adapted from data summarized in Casarett D, Kapo J, Caplan A. Appropriate use of artificial nutrition and hydration—fundamental principles and recommendations. N Engl J Med. 2005;353:2607-2612.
PALLIATIVE CARE NEEDS OF OLDER ADULTS
Although death occurs far more commonly in older adults than in any other age group, remarkably little is known about the course of serious illness in the oldest old, that is, those over age 75. Most research on the experience of living with serious illness has been done in younger populations, and most studies examining pain and symptom management have focused on younger populations. Studies in older adults have focused primarily on patients’ preferences for care rather than on the actual care received. Indeed, the largest study to date of the experience of living with a serious illnesses in the United States (Study to Understand Prognoses and Preferences for Outcomes and Risks of Treatments [SUPPORT]) studied the hospital experience of patients with a median age of 66 (17). The median age of death in the United States is 78 years, and many of the oldest old die in nursing homes or at home rather than in hospital. Data from Medicare and state Medicaid registries suggest that expensive and high technology interventions are less frequently applied to the oldest patients, independent of functional status and projected life expectancy. Whereas these discrepancies may reflect patient preferences and indicate appropriate utilization of resources and patient preferences, it is more likely that they represent a form of implicit rationing of resources based on age. The implication is disturbing, considering that half of the highest cost, Medicare enrollees survive at least 1 year (18).
Aside from pain and other sources of physical distress (see Section “Symptom Management: The Challenge of Pain”), the key characteristic that distinguishes the experience of serious illness in the elderly from that experienced by younger groups is the nearly universal occurrence of long periods of functional dependency and need for family caregivers in the last months to years of life. In SUPPORT, the median age of participants was 66 years and 55% of patients had persistent and serious family caregiving needs during the course of their terminal illness (19), and in another study of 988 terminally ill patients, 35% of families had substantial care needs (20). This percentage rises exponentially with increasing age. Although paid care supplements provide the sole source of care in 15% to 20% of patients (transportation, homemaker services, personal care, and more skilled nursing care), the remaining 80% to 85% of patients receive most of their care from unpaid family members (20). Furthermore, most family caregiving is provided by women (spouses and adult daughters and daughters-in-law), placing significant strains on the physical, emotional, and socioeconomic status of the caregivers. Those ill and dependent patients without family caregivers, or those whose caregivers can no longer provide nor afford needed services, are placed in nursing homes. In the United States, this typically occurs after patients exhaust all of their financial savings in order to become eligible for Medicaid. At present, 20% of over the age 85 population reside in a skilled nursing facility, and this number is expected to increase dramatically in the next 50 years (21). Present estimates suggest that the current number of skilled nursing facility beds in the United States will be woefully inadequate for the needs of our aging population.
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