Geriatrics

Geriatrics is a specialized branch of medicine dedicated to the unique health requirements of older adults. The term is derived from two Greek words: "geron," meaning old man, and "iatros," meaning healer. While some older adults remain very healthy, they are statistically more likely to manage chronic health concerns. This often necessitates more frequent or complex medical intervention. Geriatricians, or geriatric physicians, do not follow a fixed age to begin seeing patients. Instead, care is determined by individual needs and available support structures. This medical specialty is essential for managing multiple chronic conditions or age-related complications that impact daily life.

There is a distinct difference between geriatrics and gerontology. Gerontology is the multidisciplinary study of the aging process itself. It defines aging as the decline in organ function over time without the influence of injury, illness, or environmental risks. Geriatrics is sometimes referred to as medical gerontology because it applies medical science to these processes. Geriatric care is highly interdisciplinary. It involves a team of specialists including doctors, nurses, pharmacists, and social workers. Physical and occupational therapists also play vital roles in this collaborative approach.

The mechanism of geriatric care relies on shared decision-making. Treatment is driven by the specific goals and preferences of the patient. These goals might include preserving physical function, improving quality of life, or prolonging years of life. In the United States and Canada, clinicians often use a mnemonic called the 5 M's. This framework focuses on mind, mobility, multicomplexity, medications, and what matters most to the patient. By focusing on these five areas, providers can address the complex needs of an aging population more effectively.

Physiological changes in older adults create significant medical complexity. As people age, they experience a decline in physiological reserve in their organs. This means that mild issues can lead to severe complications. For example, mild dehydration from gastroenteritis can be dangerous. A low-grade fever might cause confusion instead of a typical cough. This confusion, known as delirium, can lead to a fall and a broken hip, specifically a fracture of the neck of the femur. Because diseases often present atypically, such as pneumonia causing confusion rather than high fever, diagnosis requires careful clinical assessment.

Cognitive aging involves specific changes in brain structure and function. While crystallized abilities, such as general knowledge, often remain stable, fluid abilities typically decline. Fluid abilities include processing speed, working memory, and executive function. Older adults may show weaker activity in the occipital region of the brain but stronger activity in the prefrontal and parietal regions to compensate. Cognitive decline can progress from normal aging to mild cognitive impairment (MCI). MCI is a transitional state that affects 10% to 20% of adults over age 65. It is a high-risk condition for developing Alzheimer's disease, which is the most common cause of dementia, accounting for 40% to 80% of cases.

Medication management is a critical component of geriatric pharmacology. Many older adults experience polypharmacy, which is the practice of taking multiple medications simultaneously. This often occurs because they are managing several chronic diseases at once. Age-related changes affect pharmacokinetics, which is how the body processes drugs. These changes impact absorption, distribution, metabolism, and excretion. For instance, decreased hepatic function can interfere with drug metabolism. Reduced kidney function can affect renal elimination. Additionally, pharmacodynamic changes can alter how sensitive a patient is to a drug, such as increasing the effects of morphine.

Geriatricians also monitor "geriatric syndromes," which are clinical conditions common in the elderly. These are not caused by a single disease but by multiple factors affecting several organ systems. Frailty is one such syndrome, marked by a decline in physiological reserve and increased vulnerability to stress. This can manifest as unintentional weight loss or muscular weakness. Another focus is functional status, measured through activities of daily living (ADL) and instrumental activities of daily living (IADL). ADLs are basic tasks like feeding and hygiene. IADLs are complex skills like managing finances or cooking.

Understanding these functional levels helps determine the necessary level of support. If a patient struggles with these tasks, they may require different living arrangements. These can range from senior housing apartments to skilled nursing facilities or home-based care.

Other common concerns include falls, which are a leading cause of hospitalizations for those 65 and older, and malnutrition. Malnutrition affects 12% to 50% of hospitalized elderly patients. By addressing these various physical, cognitive, and social factors, geriatric medicine seeks to maintain independence and well-being in later life.