Fall Risk Assessment

Clinical meaning

Falls are the leading cause of injury-related morbidity and mortality in hospitalized patients and community-dwelling older adults. Understanding the physiology of balance maintenance is essential for recognizing why patients fall and how to prevent falls effectively. Postural stability (balance) depends on the coordinated integration of three sensory systems: the visual system, the vestibular system, and the proprioceptive (somatosensory) system. The visual system provides spatial orientation information about the body's position relative to the environment. The vestibular apparatus in the inner ear (semicircular canals and otolith organs) detects head position and angular and linear acceleration, providing information about motion and gravitational orientation. The proprioceptive system consists of mechanoreceptors (muscle spindles, Golgi tendon organs, joint receptors) located in muscles, tendons, ligaments, and joint capsules throughout the body, particularly concentrated in the feet and ankles, which detect joint position, muscle stretch, and pressure distribution. These three sensory inputs are integrated in the cerebellum, basal ganglia, and brainstem vestibular nuclei to generate coordinated motor responses that maintain upright posture and prevent falls. The motor response component requires adequate muscle strength (particularly in the lower extremities -- quadriceps, hip abductors, and ankle dorsiflexors), intact neuromuscular transmission, and normal joint range of motion. With aging, each component of balance deteriorates progressively. Visual acuity and depth perception decline. Vestibular hair cells degenerate, reducing sensitivity to position changes. Proprioceptive receptor density decreases, particularly in the feet. Muscle mass and strength decline (sarcopenia), with a 30-50% reduction in muscle mass between ages 30 and 80. Reaction time slows due to decreased nerve conduction velocity and central processing speed. Bone density decreases (osteoporosis), making fractures from falls more likely and more severe. Falls result from the interaction between intrinsic factors (patient-related conditions that impair balance) and extrinsic factors (environmental hazards that challenge balance). Intrinsic factors include orthostatic hypotension (a drop in systolic blood pressure of 20 mmHg or more, or diastolic of 10 mmHg or more, within 3 minutes of standing), which reduces cerebral perfusion and causes dizziness or syncope. Medications are a major modifiable risk factor: sedatives, opioids, antihypertensives, diuretics, antihistamines, and psychotropic medications all increase fall risk through mechanisms including sedation, orthostatic hypotension, impaired cognition, and altered gait. Polypharmacy (use of 4 or more medications) independently increases fall risk. Cognitive impairment from delirium, dementia, or acute illness reduces safety awareness and judgment. The practical nurse plays a critical role in fall prevention by conducting systematic risk assessments, implementing individualized fall prevention interventions, and reassessing risk whenever a patient's condition changes.

Exam relevance

Risk factors: - Age 65 years or older (the single strongest demographic risk factor for falls; risk doubles with each decade after 65) - History of previous falls (the strongest predictor of future falls -- patients who have fallen once are 2-3 times more likely to fall again) - Polypharmacy (4 or more medications), especially sedatives, opioids, antihypertensives, benzodiazepines, and diuretics - Cognitive impairment from delirium, dementia, or acute illness (impaired safety awareness and judgment) - Gait and balance disturbances from neurological conditions (stroke, Parkinson disease, peripheral neuropathy), musculoskeletal conditions (arthritis, foot deformities), or deconditioning - Visual impairment (cataracts, glaucoma, macular degeneration, bifocal or multifocal lenses on stairs) - Orthostatic hypotension (common in elderly patients, those on antihypertensives, and patients with dehydration or prolonged bedrest)

Diagnostics: - Morse Fall Scale (MFS): validated 6-item tool scoring 0-125 points; items include history of falling, secondary diagnosis, ambulatory aid use, IV therapy or heparin lock, gait quality, and mental status; score 0-24 low risk, 25-44 moderate risk, 45 or above high risk - Hendrich II Fall Risk Model: validated tool using 8 risk factors including confusion/disorientation, depression, altered elimination, dizziness/vertigo, gender, prescribed antiepileptics or benzodiazepines, and Get-Up-and-Go test; score 5 or above indicates high risk - Timed Get-Up-and-Go Test (TUG): patient rises from a chair, walks 3 meters, turns, walks back, and sits down; normal completion in less than 12 seconds; 12-20 seconds suggests moderate fall risk; more than 20 seconds indicates high fall risk and need for assistive device - Orthostatic vital signs: measure blood pressure and heart rate in supine position, then after standing for 1 minute and 3 minutes; positive if SBP drops 20 mmHg or more, or DBP drops 10 mmHg or more, or symptoms (dizziness, lightheadedness) occur - Medication review: systematic review of all medications (prescription, over-the-counter, supplements) for fall-risk-increasing drugs (FRIDs): benzodiazepines, opioids, antihypertensives, diuretics, antihistamines, antipsychotics, antidepressants - Vision screening: assess visual acuity, depth perception, and peripheral vision; refer for ophthalmologic evaluation if deficits identified; ensure corrective lenses are worn and clean

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