Hypertension

What is hypertension?

A syndrome with multiple causes leading to persistently high blood pressure.

What are the two main types of hypertension?

Essential (Primary) Hypertension and Secondary Hypertension.

What distinguishes secondary hypertension from essential hypertension?

It has a specific, identifiable cause, such as kidney disease or hormonal disorders.

What is considered normal blood pressure?

Systolic <120 mmHg and Diastolic <80 mmHg.

What blood pressure values define hypertension?

Systolic >140 mmHg or Diastolic >90 mmHg on at least three consecutive visits.

What is pre-hypertension?

A systolic pressure between 120-139 mmHg or diastolic between 80-89 mmHg.

How does blood pressure change with age?

Systolic pressure rises throughout life, while diastolic pressure rises until 50-60 years of age, then declines.

Why is pulse pressure important in aging?

Pulse pressure increases with age due to the progressive rise in systolic pressure and decline in diastolic pressure.

What is the most common cause of hypertension?

Increased peripheral vascular resistance.

How does blood viscosity contribute to hypertension?

Increased viscosity raises arterial pressure by making it harder for blood to flow.

What is the fundamental equation for blood pressure regulation?

BP = Total Peripheral Resistance × Cardiac Output.

What role does the renin-angiotensin-aldosterone system (RAAS) play in hypertension?

It regulates blood volume and vascular resistance, significantly impacting blood pressure.

Why is hypertension known as the 'silent killer'?

It often has no symptoms but causes severe complications over time.

What are the major cardiovascular complications of hypertension?

Myocardial infarction and heart failure.

What neurological conditions can result from hypertension?

Thrombotic stroke, hemorrhagic stroke, and hypertensive encephalopathy.

How does hypertension affect the kidneys?

It can cause renal failure due to increased pressure damaging kidney tissues.

What symptoms indicate hypertensive encephalopathy?

Confusion, disordered consciousness, and seizures due to cerebral edema.

What are early physical signs of hypertension?

Often absent; symptoms appear in later stages.

What retinal changes indicate advanced hypertension?

Hypertensive retinopathy, retinal hemorrhages, exudates, and papilledema.

What cardiac changes occur due to long-term hypertension?

Left ventricular hypertrophy and potential heart failure.

What condition results from an extreme acceleration of hypertension?

Malignant hypertension.

What is the main focus of modern hypertension treatment?

Controlling systolic hypertension, especially in older adults.

What are the first-line medications for treating hypertension?

Beta-blockers, ACE inhibitors, ARBs, calcium channel blockers, and diuretics.

What is the role of plasma renin measurement in hypertension management?

It helps determine whether hypertension is driven by vasoconstriction or volume expansion.

What condition results from congenital narrowing of the aorta?

Coarctation of the aorta.

How does coarctation of the aorta lead to high blood pressure?

It increases resistance above the narrowing, causing systemic hypertension.

What is salt sensitivity in hypertension?

A condition where blood pressure is significantly affected by sodium intake.

What populations have a higher prevalence of salt-sensitive hypertension?

African Americans and individuals with essential hypertension.

How does obesity contribute to hypertension?

Through increased sympathetic activity, insulin resistance, and sodium retention.

How does excess aldosterone cause hypertension?

It increases sodium and water retention, raising blood volume.

How does cortisol excess lead to high blood pressure?

It enhances sodium retention and vascular sensitivity to vasoconstrictors.

What condition results from adrenal tumors producing catecholamines?

Pheochromocytoma.

How does estrogen influence blood pressure?

It increases angiotensinogen levels, which raises blood pressure.

What role does nitric oxide (NO) play in blood pressure regulation?

vasodilator that reduces vascular resistance.

What dietary plan is recommended for managing hypertension?

The DASH diet (low sodium, high in fruits and vegetables).

What lifestyle changes can help control hypertension?

Exercise, weight loss, reducing sodium intake, and stress management.

What is the mechanism of beta-blockers in hypertension treatment?

They reduce heart rate and cardiac output by blocking adrenaline’s effects.

What is the definition of a hypertensive crisis?

A blood pressure reading above 180/120 mmHg.

What is the primary risk of untreated hypertension?

Increased risk of heart attack, stroke, and kidney failure.

What is the preferred treatment for volume-expanded hypertension?

Diuretics.

Why do ACE inhibitors help lower blood pressure?

They prevent the conversion of angiotensin I to angiotensin II, a vasoconstrictor.

What is the long-term goal of hypertension management?

Reducing complications and improving overall cardiovascular health.