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Isolated Systolic Hypertension – Causes and Treatment

Isolated systolic hypertension refers to an elevated upper blood pressure reading (systolic ≥140 mmHg) with a normal lower value. It is most common in older adults.

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Things worth knowing about "Isolated Systolic Hypertension"

Isolated systolic hypertension refers to an elevated upper blood pressure reading (systolic ≥140 mmHg) with a normal lower value. It is most common in older adults.

What Is Isolated Systolic Hypertension?

Isolated systolic hypertension (ISH) is a form of high blood pressure in which only the systolic blood pressure – the upper number in a blood pressure reading – is persistently elevated. The defining threshold is a systolic value of ≥140 mmHg, while the diastolic value (the lower number) remains below 90 mmHg. ISH is the most common form of hypertension in people over the age of 60 and represents an independent cardiovascular risk factor.

Causes

In most cases, isolated systolic hypertension develops as a result of age-related changes in the large blood vessels, particularly the aorta. Key contributing factors include:

Arterial stiffness: As people age, the walls of the arteries lose their elasticity. This causes the pressure during each heartbeat (systole) to rise more sharply.
Atherosclerosis: The buildup of plaques within the arterial walls further reduces vessel compliance and flexibility.
Increased cardiac output: Conditions such as hyperthyroidism, anemia, or aortic valve regurgitation can also cause an isolated rise in systolic pressure.
Secondary causes: In rare cases, an underlying condition such as kidney disease or hormonal disorders may be responsible.

Symptoms

Isolated systolic hypertension often goes unnoticed for a long time as it may cause no obvious symptoms. When symptoms do occur, they may include:

Headaches, especially in the morning
Dizziness or lightheadedness
Visual disturbances
Ringing in the ears (tinnitus)
Heart palpitations or irregular heartbeat

Because ISH is frequently asymptomatic, it is often discovered incidentally during routine check-ups. Regular blood pressure monitoring is therefore strongly recommended, particularly for older adults.

Diagnosis

The diagnosis of isolated systolic hypertension is based on repeated blood pressure measurements. The diagnostic criteria are:

Systolic value: ≥140 mmHg on at least two separate occasions
Diastolic value: <90 mmHg

Additional diagnostic tests may include:

24-hour ambulatory blood pressure monitoring (ABPM): Records blood pressure throughout the day and night to rule out white-coat hypertension.
Laboratory tests: Blood and urine analysis to assess kidney function, blood glucose, and lipid levels.
ECG and echocardiography: To evaluate potential cardiac changes caused by chronically elevated pressure.
Carotid artery ultrasound: To detect signs of atherosclerotic changes in the blood vessels.

Treatment

Non-Pharmacological Measures

For mildly elevated values, lifestyle modifications are recommended as the first step:

Reducing dietary salt intake (less than 5 g of table salt per day, as recommended by the WHO)
Regular physical activity (e.g., moderate aerobic exercise)
Weight loss in overweight individuals
Limiting alcohol consumption
Quitting smoking
Stress management and relaxation techniques

Pharmacological Treatment

When lifestyle changes alone are not sufficient, antihypertensive medications are used. Preferred drug classes for isolated systolic hypertension include:

Thiazide diuretics: Promote the excretion of water and sodium through the kidneys, thereby lowering blood pressure.
Calcium channel blockers: Dilate blood vessels and reduce vascular resistance.
ACE inhibitors and ARBs (angiotensin receptor blockers): Block the renin-angiotensin-aldosterone system for sustained blood pressure reduction.

In older patients, the treatment goal is generally a systolic value between 130 and 140 mmHg. Individual factors such as comorbidities and tolerability are carefully considered. In very elderly or frail patients, excessive lowering of blood pressure is avoided to prevent falls due to orthostatic hypotension.

Risks and Complications

Untreated isolated systolic hypertension significantly increases the risk of serious complications:

Stroke
Heart attack
Heart failure
Chronic kidney disease
Vascular dementia

Studies have shown that consistent treatment of ISH can reduce the risk of stroke by up to 30% and significantly lower the risk of myocardial infarction.

References

Williams B et al. - 2018 ESC/ESH Guidelines for the management of arterial hypertension. European Heart Journal, 2018.
World Health Organization (WHO) - Hypertension. Key Facts. WHO Global Report, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/hypertension
Staessen JA, Gasowski J, Wang JG et al. - Risks of untreated and treated isolated systolic hypertension in the elderly: meta-analysis of outcome trials. The Lancet, 2000;355(9207):865-872.

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