Baroreceptor Dysfunction in the Elderly

Primary Causes of Baroreceptor Dysfunction

Age-related reduction in cardiac compliance limits the ability to respond to blood pressure changes, resulting in reduced cardiac responsiveness to stress and impaired baroreceptor function in elderly patients 1
Stiff large arteries contribute to increased blood pressure variability in older patients, leading to exaggerated blood pressure drops during postural changes, after meals, and after exercise 2
Age-related decreases in baroreflex buffering lead to exaggerated blood pressure drops during postural changes, after meals, and after exercise in elderly populations 2

Baroreceptor sensitivity decreases progressively with aging at a rate of approximately 1% function per year after age 40, affecting the autonomic nervous system and leading to reduced responsiveness to blood pressure fluctuations 1

Orthostatic hypotension (OH) is a common manifestation of baroreceptor dysfunction in the elderly, defined as a supine-to-standing BP decrease of 20 mmHg systolic or 10 mmHg diastolic, and occurs in approximately 7% of men over 70 years old 3
OH carries a 64% increase in age-adjusted mortality compared with control populations, and is associated with increased risk of falls and fractures in the elderly 3

Medications commonly used in the elderly, such as venodilator antihypertensive drugs, especially β-blockers and α-blockers, can exacerbate baroreceptor dysfunction and worsen orthostatic hypotension 3
Multiple drug therapy (polypharmacy) common in elderly patients can also contribute to baroreceptor dysfunction and orthostatic hypotension 4

The American Heart Association recommends that clinicians be alert to potential orthostatic hypotension symptoms such as postural unsteadiness, dizziness, or fainting, and obtain lying and standing blood pressures periodically in all hypertensive individuals over 50 years old 3
When treating hypertension in elderly patients with baroreceptor dysfunction, the European Society of Cardiology recommends considering a slow titration approach for those with widely variable blood pressure, and using caution with ACE inhibitors due to greater likelihood for hypotension 5

Maintaining adequate hydration and avoiding excessive alcohol intake can help prevent baroreceptor dysfunction and orthostatic hypotension in elderly patients, as recommended by the American Heart Association 2
Encouraging appropriate physical activity to maintain cardiovascular conditioning, and considering salt intake modification based on individual needs, can also help prevent baroreceptor dysfunction and orthostatic hypotension in elderly populations 2