Geriatric Syndromes — An Overview

A geriatric syndrome is a clinical condition in older people that does not fit into a discrete disease category. Geriatric syndromes are highly prevalent, multifactorial, and associated with substantial morbidity and poor outcomes.

The defining feature is a many-to-one and one-to-many relationship: multiple contributing causes converge on a single presenting problem, and any one problem may arise from many different causes. This is the opposite of the classical single-disease model.

Because diagnoses often do not tell the whole story in geriatrics, it is more helpful to think in terms of presenting problems.

The underlying principle is homeostenosis — the progressive decline in the reserve capacity of all organ systems with increasing age, so that several small deficits combine to cross a threshold and produce a syndrome that no single deficit would have caused.

The classical list — "the series of I's": Immobility · Instability (falls) · Incontinence · Intellectual impairment

Infection · Impairment of vision and hearing · Irritable colon · Isolation (depression) · Inanition (malnutrition) · Impecunity · Iatrogenesis · Insomnia · Immune deficiency · Impotence.

Morley's "new geriatric giants" add frailty, sarcopenia, anorexia of ageing and cognitive impairment — reflecting the modern emphasis on pre-disability states.

Illustrative example (immobility): it may be caused by a fractured hip, congestive heart failure, a recent fall with fear of falling, or pain from degenerative joint disease — any or all together. It is essential to explore the underlying causes with the individual so that appropriate interventions can be implemented; pain and fear of falling must be addressed before engaging the person in an exercise programme.

Four shared risk factors run across the five best-validated geriatric syndromes (Tinetti, Inouye, Gill and Doucette, JAMA 1995; Inouye et al., JAGS 2007): - Older age - Baseline cognitive impairment - Baseline functional impairment - Impaired mobility

The five syndromes in which these were demonstrated: pressure ulcers, incontinence, falls, functional decline and delirium.

Clinical corollary: because the risk factors are shared, multiple risk factor reduction is more effective than the regular single-disease medical model, and one intervention can prevent several syndromes at once.

Landmark proof-of-concept trials: Inouye's multicomponent HELP intervention (NEJM 1999) for delirium prevention, and Tinetti's multifactorial intervention (NEJM 1994) to reduce falls in the community — both showing that targeting shared risk factors works.

The number of risk factors present determines the total risk, which rises proportionally as they accumulate — demonstrated by Tinetti for dizziness (five to seven significant risk factors).

Iatrogenesis is an all too common problem, and the risk increases with exposure to the care system — tests, surgical interventions, medications and treatments. In every interaction the risk–benefit balance must be considered and explained to the individual and their proxy.

Medication management needs particular deliberation, because older adults have marked changes in absorption, metabolism and excretion. Use Beers criteria and STOPP-START, review anticholinergic burden, and check QTc risk with psychotropics.

Even more dangerous is the careless, hasty application of clinical labels. A patient who becomes confused in hospital may not have dementia; a person with an occasional urinary accident is not necessarily incontinent. Labelling a patient as demented or incontinent is too often the first step towards nursing-home placement — a setting that can make such labels self-fulfilling prophecies.

The clinical method for any geriatric syndrome: - Treat the presenting problem as a syndrome, not a diagnosis - Enumerate all contributing factors rather than searching for one cause - Look specifically for the shared risk factors — cognition, function, mobility - Search for reversible contributors: a new drug or dose change (including over-the-counter), an intercurrent acute illness, or a change in living conditions - Intervene on as many factors as possible simultaneously - Link assessment to a care plan and long-term follow-up 17. Comprehensive geriatric assessment is the definitive vehicle for identifying and managing geriatric syndromes, because it is the only method that systematically covers all the contributing domains at once.

Criteria for targeting CGA in diabetes (Table 86.6) show how syndromes drive referral: presence of a geriatric syndrome (confusional state, depression, falls, incontinence, immobility, pressure sores); pre-frailty or frailty; several coexisting morbidities with complex drug regimens; disability from lower-limb vascular disease or neuropathy requiring rehabilitation; and absence of a terminal illness or dementing syndrome.

Cross-syndrome prevention principles: mobilise early ("bed is bad"), deprescribe, maintain hydration and nutrition, correct vision and hearing, avoid restraints and catheters, screen for cognition and mood, and treat pain. Because pressure injuries, falls, delirium and functional decline share risk factors, multifactorial interventions delivered by a multidisciplinary team are effective across all of them.

The major barrier is implementation, not evidence. Preventive strategies of proven effectiveness for delirium and falls exist, but major barriers have been identified in translating research advances into clinical practice and policy.

The shared-risk-factor model is now the accepted organising principle. The Inouye/Tinetti framework — four shared risk factors (older age, baseline cognitive impairment, baseline functional impairment, impaired mobility) across five syndromes (pressure ulcers, incontinence, falls, functional decline, delirium) — remains the definitional basis, with current work focused on synergistic interactions between risk factors and on the basic mechanisms underlying multifactorial conditions.

Screening tools have been packaged. The Rapid Geriatric Assessment (RGA) bundles four syndromes — frailty, sarcopenia, geriatric anorexia and cognitive decline. Administered to 16,615 people aged 65 and over in Missouri between 2015 and 2024, it showed that nearly 40% reported five or more illnesses (37.3%), linking syndrome screening to multimorbidity risk.

Multiple geriatric syndromes are the rule, not the exception. A Chinese community study of 706 adults aged 60 and above (2022–23) assessed ten syndromes — depressive symptoms, cognitive impairment, pain, falls, sleep disturbance, constipation, polypharmacy, multimorbidity, malnutrition and frailty — and defined "multiple geriatric syndromes" as two or more in one individual. A 2023–24 hospital CGA study in Shanghai similarly evaluated pain, sleep, constipation, fall risk, urinary incontinence, polypharmacy, nutritional risk and dementia in a single assessment, using Mini-Cog, Snellen chart and Timed Up and Go for in-depth evaluation of those screening positive.

Standardised syndrome-based CGA is now guideline-mandated. The German S3 guideline (2024) requires six core dimensions — self-help ability, mobility, cognition/delirium, affect, nutrition and social situation — which map almost exactly onto the major geriatric syndromes. The Italian guideline (2024), from 117 studies, showed CGA reduces hospitalisation, mortality, institutionalisation and delirium risk and improves prescribing appropriateness.

WHO ICOPE reframes syndromes as losses of intrinsic capacity. The six domains — mobility, cognition, vitality/nutrition, vision, hearing and psychological well-being — are essentially the geriatric syndromes re-expressed as capacities to be preserved rather than deficits to be treated.

Frailty is now the strongest single predictor of adverse syndrome outcomes. A pooled odds ratio of 9.82 for incident ADL disability in frail older adults has been reported, and the NEJM 2024 review by Kim and Rockwood established "frailty-guided clinical care", stratifying management across robust, pre-frailty, frailty and end-stage frailty.

Indian burden. LASI wave-1 (31,464 adults aged 60 and above) found 44.3% with no geriatric condition, 32.7% with one, 15.9% with two and 7.1% with three or more. Individual prevalences: underweight 26.9%, dizziness 14.5%, impaired vision 13.7%, impaired hearing 9.6%, impaired cognition 9.3%, major depressive disorder 8.2%, injurious falls 5.7%, incontinence 4.0%, with 7.4% ADL dependency. Both a higher number of geriatric conditions and a higher number of chronic conditions predicted ADL dependency. Frailty affects 29.2% and pre-frailty 58.8%. The most disabling multimorbidity combination is hypertension plus arthritis plus high depressive symptoms.