HYPERTENSION
Cardiovascular Disorders | Adult Health Nursing-I
Complete Nursing Notes • Clinical Concepts • NORCET MCQ Test
High-Yield Topic Clinical Nursing Exam Revision
Learning objectives
- Define hypertension and understand blood pressure classification.
- Explain types, risk factors and pathophysiology.
- Identify clinical manifestations, diagnostic tests and complications.
- Understand lifestyle modification and antihypertensive medicines.
- Plan nursing care and recognize hypertensive emergencies.
1. Definition
Hypertension is a persistent elevation of arterial blood pressure above the applicable diagnostic threshold. Blood pressure is expressed in millimetres of mercury (mmHg) as systolic pressure over diastolic pressure.
- Systolic blood pressure (SBP): Pressure in the arteries when the ventricles contract.
- Diastolic blood pressure (DBP): Pressure in the arteries when the ventricles relax between beats.
Important: Hypertension is often asymptomatic. A person can have high blood pressure for years without feeling unwell, while damage develops in the heart, brain, kidneys, eyes or blood vessels.
2. Blood pressure classification
Classification differs between guidelines. The following table presents commonly used adult categories from the American Heart Association framework. Local clinical protocols may use different diagnostic thresholds.
| Category | Systolic (mmHg) | Diastolic (mmHg) |
|---|---|---|
| Normal | Less than 120 | And less than 80 |
| Elevated | 120–129 | And less than 80 |
| Stage 1 hypertension | 130–139 | Or 80–89 |
| Stage 2 hypertension | 140 or higher | Or 90 or higher |
| Severely elevated BP | Higher than 180 | And/or higher than 120 |
When systolic and diastolic values fall into different categories, the higher category generally determines classification under this framework. Diagnosis requires appropriate measurement and clinical assessment; a single reading is not always sufficient.
3. Types of hypertension
A. Primary (essential) hypertension
High blood pressure without one identifiable secondary cause. It accounts for the majority of adult hypertension cases and usually develops through a combination of genetic, environmental and lifestyle factors.
B. Secondary hypertension
Hypertension caused by an identifiable underlying condition or substance.
- Renal disease or renal artery stenosis.
- Endocrine disorders such as primary aldosteronism or pheochromocytoma.
- Obstructive sleep apnea.
- Some medicines or substances, including NSAIDs, certain decongestants, stimulants and corticosteroids.
- Pregnancy-related hypertensive disorders require separate assessment and management.
C. Other clinical descriptions
- Isolated systolic hypertension: Systolic pressure is elevated while diastolic pressure remains below the relevant threshold.
- White-coat hypertension: BP is elevated in a clinical setting but not persistently elevated outside it.
- Masked hypertension: Clinic readings may be normal while readings outside the clinic are elevated.
- Resistant hypertension: BP remains above target despite an appropriate multidrug regimen, after assessing adherence, measurement technique and contributing factors.
4. Risk factors
Non-modifiable factors
- Increasing age.
- Family history and genetic predisposition.
- Some population-level differences in risk.
Modifiable factors
- High sodium intake.
- Overweight and obesity.
- Physical inactivity.
- Excessive alcohol consumption.
- Tobacco use and exposure.
- Low intake of fruit, vegetables and other nutritious foods.
- Poor sleep, chronic stress and obstructive sleep apnea.
- Diabetes, kidney disease and abnormal blood lipids may increase cardiovascular risk.
5. Pathophysiology
Arterial blood pressure is influenced mainly by cardiac output and systemic vascular resistance. Persistent changes in either can contribute to hypertension.
Simplified educational diagram of mechanisms and consequences.
6. Clinical manifestations
Most patients with hypertension have no specific symptoms.
- Hypertension may be discovered during routine screening.
- Headache, dizziness or fatigue can occur but are not reliable indicators of blood pressure level.
- Visual disturbance, chest pain, shortness of breath, confusion or focal neurological deficits may indicate acute organ injury and require urgent assessment.
- Long-standing uncontrolled hypertension may cause left ventricular hypertrophy, heart failure, kidney dysfunction, retinopathy and cerebrovascular disease.
Clinical warning: Do not diagnose or exclude hypertension based on headache or dizziness alone. Severe hypertension with chest pain, breathlessness, neurological symptoms, confusion or visual changes needs emergency evaluation.
7. Accurate blood pressure measurement
- Allow the patient to rest quietly for about five minutes before measurement.
- Use a validated device and an appropriately sized cuff on a bare upper arm.
- Support the back, keep feet flat and legs uncrossed, and support the arm at heart level.
- Ask the patient to avoid talking during the measurement.
- When appropriate, obtain repeated readings and average them according to the clinical protocol.
- At initial assessment, measure both arms when recommended; use the arm with the higher reading for subsequent measurements unless instructed otherwise.
- Use home or ambulatory blood pressure monitoring when indicated to help confirm the diagnosis.
Nursing tip: An undersized cuff can produce a falsely high reading. Poor positioning, talking, recent exercise, caffeine or nicotine can also affect the result.
8. Diagnostic investigations
| Investigation | Purpose |
|---|---|
| Repeated clinic BP readings | Assess persistent elevation. |
| Home or ambulatory BP monitoring | Help identify white-coat or masked hypertension. |
| Urinalysis and urine albumin assessment | Assess possible renal damage. |
| Serum creatinine and eGFR | Assess kidney function. |
| Electrolytes | Identify abnormalities and provide a baseline before or during selected treatments. |
| Blood glucose or HbA1c | Assess diabetes and cardiovascular risk. |
| Lipid profile | Assess cardiovascular risk. |
| ECG | Assess cardiac rhythm and possible evidence of cardiac effects. |
| Additional tests | Ordered when symptoms or findings suggest a secondary cause or target-organ damage. |
9. Management of hypertension
A. Lifestyle modification
- Reduce sodium: Limit excess salt and high-sodium processed foods.
- Healthy diet: Use a DASH-style eating pattern with vegetables, fruit, whole grains, legumes and suitable protein sources.
- Physical activity: Aim for regular aerobic activity, often around 150 minutes of moderate activity weekly when medically appropriate.
- Weight management: Work toward a healthy weight if overweight.
- Alcohol: Avoid excessive intake; reducing or avoiding alcohol can help blood pressure control.
- Stop tobacco: Smoking cessation reduces overall cardiovascular risk.
- Sleep: Address poor sleep and possible obstructive sleep apnea.
- Adherence: Take prescribed medicines consistently and attend follow-up visits.
B. Antihypertensive medicines
| Drug class | Examples | Nursing considerations |
|---|---|---|
| Thiazide/thiazide-like diuretics | Chlorthalidone, indapamide | Monitor BP, electrolytes, renal function and volume status as indicated. |
| ACE inhibitors | Enalapril, lisinopril | Monitor potassium and renal function; observe for cough or angioedema. Avoid in pregnancy. |
| ARBs | Losartan, valsartan | Monitor potassium and renal function. Avoid in pregnancy. |
| Calcium channel blockers | Amlodipine | Monitor BP, ankle edema, dizziness and other adverse effects. |
| Beta blockers | Metoprolol, bisoprolol | Monitor pulse and BP; assess for bradycardia. Used for selected indications and patients. |
Other medicines may be selected for specific conditions or when blood pressure remains uncontrolled. Treatment depends on BP level, cardiovascular risk, comorbidities, adverse effects and the patient's circumstances.
Medication safety: Do not stop antihypertensive medicines abruptly or change doses independently. ACE inhibitors and ARBs are contraindicated during pregnancy. Drug choice and monitoring should follow the prescriber's instructions and local protocols.
10. Hypertensive urgency and emergency
Terminology and thresholds vary across guidelines. A very high BP reading alone does not automatically establish a hypertensive emergency.
| Feature | Severely elevated BP without acute organ injury | Hypertensive emergency |
|---|---|---|
| Blood pressure | May be markedly elevated, often around 180 systolic and/or 120 diastolic or higher | Often markedly elevated, but no single threshold is sufficient by itself |
| Acute target-organ injury | Not identified | Present or strongly suspected |
| Examples | Severe reading without acute neurological, cardiac or renal injury | Encephalopathy, acute pulmonary edema, aortic dissection or acute stroke-related complications |
| Management | Prompt clinical assessment, repeat proper measurement and clinician-directed adjustment | Immediate emergency assessment, monitoring and carefully controlled treatment |
Emergency nursing priority: Assess airway, breathing and circulation; check vital signs and neurological status; escalate immediately; establish monitoring and assist with prescribed investigations and treatment. Avoid rapid, uncontrolled BP reduction unless specifically indicated by the emergency condition and treatment protocol.
11. Complications of uncontrolled hypertension
- Heart: Left ventricular hypertrophy, coronary artery disease and heart failure.
- Brain: Ischemic stroke, hemorrhagic stroke and vascular cognitive impairment.
- Kidneys: Chronic kidney disease and worsening renal function.
- Eyes: Hypertensive retinopathy and visual impairment.
- Blood vessels: Peripheral arterial disease and increased risk of aortic disease.
12. Nursing management
Assessment
- Obtain accurate BP readings and assess trends.
- Review medication adherence, allergies and possible adverse effects.
- Assess cardiovascular risk factors, diet, activity, tobacco use and sleep.
- Assess for chest pain, dyspnea, neurological changes and visual symptoms.
- Review laboratory results and kidney function as relevant.
Nursing interventions
- Measure BP using the correct cuff size, position and technique.
- Administer prescribed medications and monitor the response.
- Observe for dizziness, orthostatic symptoms, bradycardia or other drug-related adverse effects.
- Monitor electrolytes and renal function when indicated by the prescribed treatment.
- Educate the patient about adherence, lifestyle changes and follow-up.
- Teach home BP monitoring and recording when appropriate.
- Encourage gradual, sustainable dietary and physical-activity changes.
- Recognize symptoms of acute organ injury and activate emergency care when indicated.
13. Patient education
- Take medicines regularly even when feeling well.
- Do not double a missed dose unless the prescriber or medication instructions advise it.
- Record home BP readings and bring them to follow-up appointments.
- Reduce excess salt and choose a balanced diet.
- Attend scheduled follow-up visits and recommended laboratory testing.
- Seek emergency help for chest pain, severe breathlessness, sudden weakness, facial drooping, speech difficulty, confusion or sudden visual loss.
14. High-yield NORCET revision
- Hypertension is frequently asymptomatic.
- Primary hypertension has no single identifiable secondary cause.
- Secondary hypertension results from an identifiable condition or substance.
- Correct cuff size and positioning are essential for accurate BP measurement.
- Common first-line drug classes include thiazide-type diuretics, ACE inhibitors/ARBs and long-acting calcium channel blockers, depending on the patient and guideline.
- ACE inhibitors and ARBs should not be used during pregnancy.
- Assess potassium and renal function when relevant to antihypertensive treatment.
- Hypertensive emergency involves acute target-organ injury and requires immediate evaluation.
- Long-term uncontrolled hypertension increases stroke, heart failure and kidney disease risk.
Quick recall: Measure correctly → confirm persistent elevation → assess cardiovascular risk and organ damage → lifestyle changes and prescribed treatment → monitor response and adherence.
15. Hypertension MCQ Practice Test
25 Questions | 30 Minutes | One question at a time
Select one answer for each question. Use only the three buttons below: Previous, Next and Submit Test. After submission, your score and explanations will appear.
Question 1 of 25
30:00
Press Next to move forward.
Educational disclaimer: These notes are for nursing education and exam preparation. Clinical decisions, diagnosis and treatment must follow current guidelines and the treating clinician's judgment.