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Hypertension in elderly--an overview
Insights
Hypertension in the elderly presents unique challenges due to arterial stiffening. Effective management, particularly of systolic blood pressure, is crucial for reducing cardiovascular risks in this population.
Area of Science:
- Gerontology
- Cardiology
- Internal Medicine
Background:
- Hypertension (HT) in the elderly is common and has distinct pathophysiological, clinical, and therapeutic implications.
- Age-related arterial stiffening increases systolic blood pressure (SBP) and left ventricular (LV) mass, compromising cardiac output and renal blood flow.
- Renin-angiotensin system and kidney involvement are minimal in elderly HT pathogenesis.
Purpose of the Study:
- To outline the diagnostic criteria and therapeutic strategies for hypertension in the elderly.
- To highlight the specific challenges and considerations in managing hypertension in older adults.
- To emphasize the importance of individualized treatment plans and monitoring for side effects.
Main Methods:
- Review of pathophysiological changes in elderly vasculature affecting blood pressure.
- Analysis of diagnostic criteria for hypertension, including isolated systolic hypertension (ISH).
- Evaluation of therapeutic approaches, drug choices, and treatment goals for elderly patients with HT.
Main Results:
- Diagnosis of HT is SBP > 140 mm Hg and/or DBP > 90 mm Hg, with ISH defined as SBP > 140 mm Hg and DBP < 90 mm Hg.
- SBP elevation is more dangerous than DBP in the elderly, with significant risks of coronary artery disease (CAD) and cerebrovascular accident (CVA).
- Therapeutic benefits are substantial, especially when SBP > 160 mm Hg, though diminishing after age 80.
Conclusions:
- Gradual, stepwise therapy is recommended, targeting BP below 140/90 mm Hg.
- Diuretics (e.g., thiazide) are first-line agents, with ACE inhibitors and Calcium Entry Blockers (CEB) as alternatives for specific conditions.
- Close monitoring for side effects due to altered physiology, pharmacokinetics, and drug interactions is essential in elderly patients.
Abstract:
Hypertension (HT) is a common disease in elderly. It has different pathophysiologic, clinical and therapeutic implications in this age group. Due to loss of arterial wall elasticity with age, major vessels including aorta become stiff and less distensible. As age advances, these stiff vessels also lose beta adrenergic responsiveness with unchanged alpha adrenergic responsiveness. These together raise peripheral vascular resistance and aortic impedance which needs a powerful systolic ejection of left ventricle to maintain cardiac output. Result is rise in systolic blood pressure (SBP) and increase in left ventricular (LV) mass with compromised cardiac output and renal blood flow. Participation of renin-angiotensin system and kidney in HT pathogenesis in elderly are minimum. Diagnosis of HT in elderly is made if SBP > 140 mm Hg and/or diastolic blood pressure (DBP) > 90 mm Hg or is taking antihypertensive medications. Isolated systolic hypertension (ISH) means SBP > 140 mm Hg with DBP < 90 mm Hg. Measurement of blood pressure (BP) is problematic, mainly due to pseudo HT, postural hypotension and white-coat HT. HT in absence of end organ changes suggest pseudo HT. Postural hypotension must be detected and treated. Systolodiastolic HT, carried over from middle age is the commonest type of HT in elderly. ISH is also common (10%). Atherosclerotic renovascular disease can cause secondary HT. Therapy is always needed in HT in elderly. Chance of coronary artery disease (CAD) and cerebrovascular accident (CVA) are quite high amongst elderly hypertensives. SBP is more dangerous than DBP. Benefits of therapy are more when compared to young. HT should be treated if SBP > 160 mm Hg and/or DBP > 90 mm Hg. ISH needs therapy if SBP > 160 mm Hg. The benefits of therapy becomes less after 80 years. Treatment goal should be to keep BP below 140/90 mm Hg. Therapy should be gradual and stepwise. Na-restriction should be modest. Diuretics (e.g., thiazide 25 mg/day) are the drug of choice unless contra-indicated. Beta blockers are inferior agents compared to diuretics unless angina or acute myocardial infarction (AMI) is present. Angiotensin converting enzyme (ACE) inhibitors are drug of choice only if congestive cardiac failure (CCF) and/or diabetes is present or other drugs are contra-indicated. Calcium entry blockers (CEB) are new but very good alternative to diuretics in elderly. Due to abnormal physiology, pharmacokinetics and drug interactions, side-effects are very common in elderly. They should be detected early and treated.