Hypertension: Pathophysiology, Classification, and Pharmacology

What percentage of adults aged 20 and older are treated for hypertension in the United States?

Greater than 40%

What is the primary role of baroreceptors in hypertension?

They regulate blood pressure by detecting changes in arterial pressure.

How does body fluid volume affect blood pressure?

Increased fluid volume leads to increased pressure, similar to cranking up water flow in a hose.

What is the renin-angiotensin-aldosterone system?

A hormone system that regulates blood pressure and fluid balance, where renin from kidneys affects angiotensin and aldosterone.

What does angiotensin II do?

It is a potent vasoconstrictor that increases blood pressure and stimulates aldosterone release.

What is vascular auto-regulation?

The ability of blood vessels to maintain a constant blood flow despite changes in blood pressure.

What is the diagnostic criterion for hypertension based on blood pressure readings?

Blood pressure greater than 130/80 mmHg on two or more assessments at least two weeks apart.

What are the two main types of hypertension?

Essential (primary) hypertension and secondary hypertension.

What characterizes stage one hypertension?

Systolic blood pressure of 130-139 mmHg and diastolic of 80-89 mmHg.

What characterizes stage two hypertension?

Systolic blood pressure of 140 mmHg or higher and diastolic of 90 mmHg or higher.

What is a hypertensive crisis?

A condition where systolic blood pressure is greater than 180 mmHg and diastolic is greater than 120 mmHg.

What are common symptoms of hypertensive crisis?

Blurred vision, headaches, and shortness of breath.

What is essential hypertension?

The most common type of hypertension with no identifiable cause, requiring treatment to prevent organ damage.

What are some major risk factors for essential hypertension?

African American ethnicity, hyperlipidemia, smoking history, age over 60, obesity, and lack of physical activity.

What is secondary hypertension?

Hypertension caused by another underlying condition, such as kidney disease.

What is a common cause of secondary hypertension in pregnancy?

Pre-eclampsia and eclampsia.

What role do medications play in hypertension?

Certain medications can cause secondary hypertension as a side effect.

Why is hypertension often called the 'silent killer'?

Because it often has no symptoms until significant damage has occurred.

What is a fundoscopic examination used for in hypertension assessment?

To check for retinal damage caused by high blood pressure.

What is an abdominal bruise indicative of in hypertension?

It may indicate narrowed or partially blocked arteries.

What is the significance of assessing blood pressure on both arms?

To ensure accurate readings and detect potential vascular issues.

What is the impact of cuff size on blood pressure readings?

An incorrect cuff size can lead to inaccurate blood pressure measurements.

How does obesity contribute to hypertension?

Obesity increases the risk of developing hypertension due to increased body fluid volume and vascular resistance.

What is the relationship between kidney disease and hypertension?

Kidney disease can lead to secondary hypertension due to fluid and electrolyte imbalances.

What lifestyle changes can help manage hypertension?

Regular physical activity, healthy diet, weight management, and smoking cessation.

What is the role of the sympathetic nervous system in blood pressure regulation?

It helps to constrict and dilate blood vessels to maintain blood pressure.

What is the effect of aldosterone on blood pressure?

It promotes sodium reabsorption, leading to increased fluid volume and higher blood pressure.

What is a common sound heard during abdominal examination that indicates narrowed arteries?

A washing or blowing sound, indicative of narrowed or partially blocked arteries.

What are some signs and symptoms of hypertension?

Headache, vision changes, dizziness, or fainting.

What psychosocial factors should be assessed in patients with hypertension?

Stress levels and sleep patterns.

What is the primary diagnostic tool for hypertension?

A blood pressure reading.

What laboratory tests are important in assessing kidney disease related to hypertension?

BUN (Blood Urea Nitrogen) and creatinine levels.

What condition must be ruled out in patients with hypertension?

Cushing's syndrome.

What imaging study is used to assess cardiomyopathy in hypertensive patients?

Chest X-ray.

What does an EKG evaluate in hypertensive patients?

Cardiac function and abnormalities like left ventricular hypertrophy.

What is the DASH diet focused on?

Vegetables, fruits, whole grains, and foods rich in potassium, calcium, and magnesium.

What dietary components are emphasized in a heart-healthy diet?

Low sodium, low fat, and low cholesterol.

What is a common challenge patients face with hypertension management?

Adherence to dietary restrictions and medication regimens.

What strategies can help patients remember to take their medications?

Setting alarms or placing medications near daily activities.

What is the role of diuretics in hypertension treatment?

They inhibit water and sodium reabsorption and can increase potassium excretion.

What are the three types of diuretics?

Thiazide diuretics, loop diuretics, and potassium-sparing diuretics.

Give an example of a thiazide diuretic.

Hydrochlorothiazide (HCT).

What is a common loop diuretic?

Furosemide or torsemide.

What is an example of a potassium-sparing diuretic?

Spironolactone.

What should be monitored closely in patients taking diuretics?

Potassium levels.

What can thiazide and loop diuretics lead to regarding potassium levels?

Extreme hyperkalemia.

What should patients be educated about regarding potassium levels?

Signs and symptoms of hypo and hyperkalemia.

What is a significant risk factor for developing hypertension?

A family history of hypertension or stroke.

What lifestyle factor can significantly impact hypertension?

Stress management and dietary choices.

What is the importance of patient education in hypertension management?

To ensure understanding of medication adherence and lifestyle changes.

What is a common misconception among patients newly diagnosed with hypertension?

That they do not need to take medications if they feel fine.

What is the significance of monitoring blood pressure at home?

To help patients understand their condition and manage it effectively.

What can contribute to a patient's difficulty in adhering to a medication regimen?

The transition from no medications to multiple medications.

What is the role of financial assessment in hypertension management?

To identify and address any financial burdens that may affect medication adherence.

What is the relationship between potassium and diuretics?

Potassium levels must be monitored as diuretics can dramatically decrease potassium levels.

What should patients be cautious about when taking potassium supplements?

Patients should be aware that potassium supplements can be large and difficult to swallow.

What are calcium channel blockers used for?

They are used to cause vasodilation and decrease blood pressure.

Name two examples of calcium channel blockers.

Verapamil and Amlodipine.

What dietary restriction should patients on calcium channel blockers follow?

Patients should avoid grapefruit juice as it can potentiate the effects of the medication.

What is a common side effect of ACE inhibitors?

A dry, nagging cough.

What do ACE inhibitors prevent?

They prevent the conversion of angiotensin I to angiotensin II, reducing vasoconstriction.

What are ARBs and what do they do?

Angiotensin Receptor Blockers block the effects of angiotensin II at the receptor level, decreasing peripheral resistance.

Give an example of an ARB.

Valsartan or Losartan.

What should be monitored when a patient is on beta blockers?

Monitor for hypotension and bradycardia.

What is a key nursing action when administering beta blockers?

Hold the medication if systolic blood pressure is less than 100 or heart rate is less than 60.

What happens if beta blockers are stopped suddenly?

It can cause rebound hypertension.

What is the action of central alpha-2 agonists?

They reduce peripheral vascular resistance and decrease blood pressure.

Name an example of a central alpha-2 agonist.

Clonidine.

What is a common side effect of alpha adrenergic antagonists?

Postural hypotension.

What is a common cause of hypertensive crisis?

Patients not taking their medication or not taking it correctly.

What are the manifestations of hypertensive crisis?

Blurred vision, dizziness, disorientation, and epistaxis (nosebleeds).

What is the goal for blood pressure reduction in hypertensive crisis?

To decrease blood pressure by 20 to 25% in the first hour without dropping below 140/90 mmHg.

What should be monitored during IV antihypertensive administration?

Blood pressure should be monitored before, during, and after administration every 5 to 15 minutes.

What neurological assessments should be performed during hypertensive crisis management?

Assess pupils, level of consciousness, muscle strength, and ability to follow commands.

What is a major risk factor for stroke during hypertensive crisis?

Hypertensive crisis itself is a major risk factor for stroke.

What is the importance of EKG monitoring in hypertensive crisis patients?

To assess for any cardiac changes due to the crisis.

What should patients be educated about regarding antihypertensive medications?

They should not stop medications abruptly and should recognize signs of hypotension.

What is the significance of monitoring potassium levels in patients on diuretics?

To prevent complications related to hypo or hyperkalemia, which can lead to major cardiac events.

What nursing actions are critical when initiating treatment with alpha adrenergic antagonists?

Monitor blood pressure closely, especially two hours after the first dose.

What is the effect of beta blockers on heart rate?

They lower heart rate by blocking beta adrenergic receptors.

What should be done if a patient experiences a nagging cough while on ACE inhibitors?

Switch them to a different antihypertensive medication immediately.

What is the role of diuretics in managing hypertension?

They help reduce fluid volume, which lowers blood pressure.