Hypertension: NCLEX Study Guide

Hypertension is one of the most common conditions tested on the NCLEX and one of the leading causes of cardiovascular morbidity. This note reviews how blood pressure is classified, what causes hypertension, how it is diagnosed and managed, and the complications nurses must recognize early.

Blood Pressure Classification (ACC/AHA)

• Normal: Systolic <120 and Diastolic <80 — reinforce healthy lifestyle choices.
• Elevated: Systolic 120–129 and Diastolic <80 — focus on non-pharmacologic interventions (diet, exercise).
• Stage 1 HTN: Systolic 130–139 or Diastolic 80–89 — assess cardiovascular risk; provider may consider medication.
• Stage 2 HTN: Systolic ≥140 or Diastolic ≥90 — antihypertensive medication indicated.
• Hypertensive Crisis: Systolic >180 or Diastolic >120 — immediate medical attention; assess for acute organ damage.

Causes of Hypertension

Essential (Primary) Hypertension

• Accounts for approximately 90–95% of adult hypertension cases.
• No single identifiable medical cause; develops gradually over many years.
• Driven by a mix of modifiable and non-modifiable risk factors.

Non-modifiable risk factors:

• Age over 60 (increased arterial stiffness).
• Male gender (higher prevalence until women reach menopause).
• African American ethnicity (higher rates and more severe target organ damage).
• Family history of hypertension.

Modifiable risk factors:

• Obesity and overweight status.
• High dietary sodium intake (promotes fluid retention and vascular resistance).
• Sedentary lifestyle.
• Excessive alcohol consumption.
• Smoking (vasoconstriction and endothelial damage).
• Chronic stress (sympathetic nervous system activation).
• Obstructive sleep apnea (repeated hypoxia and sympathetic activation).

Secondary Hypertension

• Accounts for 5–10% of cases; caused by an underlying condition.
• Tends to appear suddenly and produce higher blood pressure than primary HTN.
• Renal disease is the most common cause and must be investigated.
• Hyperaldosteronism (Conn's syndrome) may be present in 5–10% of hypertensive patients.
• Consider renal artery stenosis when BP is very high or unresponsive to treatment.

Mnemonic: "RENAL ED" — Common Secondary Causes

• R — Renal disease: chronic kidney disease, renal artery stenosis, glomerulonephritis.
• E — Endocrine disorders: hyperaldosteronism (Conn's), pheochromocytoma, Cushing's, thyroid disease.
• N — Neurologic: increased ICP, brain tumors, spinal cord disorders.
• A — Aortic coarctation: narrowing of the aorta, usually congenital.
• L — Lung/OSA: obstructive sleep apnea, chronic hypoxia.
• E — External factors: pregnancy (preeclampsia), medications.
• D — Drugs: NSAIDs, decongestants, oral contraceptives, corticosteroids, alcohol, cocaine.

Diagnosis and the White Coat Effect

• A single high reading does not diagnose hypertension — confirm with two or more readings on separate occasions.
• Measure BP in both arms; if the difference exceeds 15 mmHg, use the arm with the higher reading (NICE guidance).
• White coat syndrome: BP readings are higher in clinical settings due to anxiety.
• White coat effect: a difference of more than 20/10 mmHg between clinic and ambulatory/home readings.
• Ambulatory blood pressure monitoring or home readings confirm the diagnosis and rule out white coat hypertension.

Initial Investigations for a New Diagnosis

• Urinalysis: check for proteinuria and microscopic hematuria (kidney damage).
• Blood tests: renal function (BMP), glucose (HbA1c), and lipids for cardiovascular risk.
• Fundoscopic exam: assess for hypertensive retinopathy, including hemorrhages and papilledema.
• ECG: check for left ventricular hypertrophy and prior silent MI.
• Echocardiogram: best test for confirming left ventricular hypertrophy if suspected.
• QRISK score or similar calculator estimates 10-year risk of stroke or MI.
• Patients with elevated cardiovascular risk may be offered statin therapy for primary prevention.

Management Pathway (Step Ladder)

Management is dictated by age, family origin, and the presence of Type 2 Diabetes.

• Step 1:
  • Under 55 or Type 2 Diabetic (any age): ACE Inhibitor (A).
  • Over 55 or Black African/Caribbean origin: Calcium Channel Blocker (C).
• Step 2: Dual therapy (A + C).
• Step 3: Triple therapy (A + C + D — add a thiazide-like diuretic).
• Step 4 (Resistant Hypertension): Add a fourth agent based on potassium:
  • K⁺ < 4.5 mmol/L: add Spironolactone (potassium-sparing).
  • K⁺ > 4.5 mmol/L: add an alpha-blocker or beta-blocker.

Safety alert: ACE inhibitors and ARBs should never be used together. ARBs are the first choice for patients of Black African/Caribbean origin or those who develop the ACE cough.

Lifestyle Management

• DASH diet: high intake of fruits, vegetables, and low-fat dairy; reduce saturated fats and cholesterol.
• Sodium intake: <1,500 mg/day if hypertensive; <2,300 mg/day for the general population.
• Exercise: at least 150 minutes of moderate-intensity aerobic activity per week.
• Weight loss: every 1 kg of weight loss can reduce systolic BP by approximately 1 mmHg.
• Alcohol: no more than 2 drinks/day for men, 1 drink/day for women.

Hypertensive Crisis

• Defined as BP above 180/120 mmHg requiring immediate evaluation.
• Hypertensive urgency: severely elevated BP without acute end-organ damage.
• Hypertensive emergency: severely elevated BP with acute, progressive end-organ damage.
• Signs of hypertensive emergency: severe headache, confusion, chest pain, dyspnea, neurological deficits, blurred vision, and papilledema.
• Patients with hypertensive emergency require immediate hospitalization and IV antihypertensive therapy.
• Lower BP gradually — by no more than 25% in the first hour — to prevent cerebral hypoperfusion.
• Elderly frail patients are at risk of ischemia if BP is reduced too quickly, because higher pressures may be needed to perfuse narrowed vessels.

IV options for hypertensive emergency:

• Sodium nitroprusside
• Labetalol
• Nicardipine
• Fenoldopam
• Nitroglycerin

Complications / Target Organ Damage — The 6 C's

• Cardiac: left ventricular hypertrophy, heart failure, CAD → dyspnea, edema, chest pain, S4 heart sound.
• Cerebral: stroke, TIA, vascular dementia → focal deficits, confusion, memory impairment.
• Chronic Kidney: hypertensive nephropathy, nephrosclerosis, renal failure → elevated creatinine, proteinuria, decreased GFR.
• Carotid Arteries: atherosclerosis, stenosis → carotid bruits, increased stroke risk.
• Coronary Arteries: atherosclerosis, MI → angina, MI, ischemic ECG changes.
• Cloudy Vision (Retina): hypertensive retinopathy → blurred vision, retinal hemorrhages, papilledema.

Left Ventricular Hypertrophy (LVH)

• The ventricle strains to pump against increased resistance, causing the heart muscle to thicken.
• Exam may reveal a sustained, forceful apex beat and an audible S4 heart sound.
• LVH can be seen on ECG using voltage criteria but is best diagnosed with echocardiogram.

Common NCLEX Traps

• Forgetting that essential hypertension accounts for 90–95% of cases and has no identifiable cause.
• Missing that renal disease is the most common cause of secondary hypertension.
• Confusing the white coat effect with true hypertension — ambulatory monitoring confirms.
• Not recognizing that a single high reading does not diagnose hypertension.
• Assuming patients will feel symptoms — most have none until organ damage occurs.
• Missing that hyperaldosteronism may be present in 5–10% of hypertensive patients.
• Forgetting that LVH is best diagnosed with echocardiogram, not ECG alone.
• Reducing BP too quickly in elderly patients, causing cerebral hypoperfusion and ischemia.
• Not recognizing that NSAIDs and decongestants raise BP in hypertensive patients.

Key Takeaways

• ACC/AHA stages: Normal <120/80, Elevated 120–129/<80, Stage 1 130–139/80–89, Stage 2 ≥140/90, Crisis >180/120.
• Essential HTN = 90–95% of cases; secondary causes follow the RENAL ED mnemonic, with renal disease being most common.
• Confirm diagnosis with multiple readings on separate occasions and use ambulatory monitoring to rule out white coat effect.
• Stepwise therapy: A (ACEi) or C (CCB) based on age/ethnicity, then A+C, then A+C+D, then add spironolactone or alpha/beta-blocker based on potassium.
• In hypertensive emergency, lower BP by no more than 25% in the first hour to avoid cerebral hypoperfusion — especially in the elderly.
• Track the 6 C's of target organ damage: Cardiac, Cerebral, Chronic Kidney, Carotid, Coronary, Cloudy vision.