Hypertensive Vascular Disease

Hypertensive Vascular Disease

Hypertensive Vascular Disease

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Introduction & Pathogenesis - Pressure Problems

  • Hypertension (HTN): Sustained elevation of systemic arterial blood pressure; a major risk factor for cardiovascular, cerebrovascular, and renal disease.
  • Classification (ACC/AHA 2017 Guidelines):
    • Normal: <120/80 mmHg
    • Elevated: 120-129/<80 mmHg
    • Stage 1 HTN: 130-139/80-89 mmHg
    • Stage 2 HTN: ≥140/90 mmHg

      ⭐ Essential hypertension, accounting for 90-95% of cases, is idiopathic with multiple contributing genetic and environmental factors.

  • Pathogenesis - "Pressure Problems":
    • Chronic ↑BP → Sustained hemodynamic stress on arterial walls.
    • Endothelial injury & dysfunction:
      • ↑ Permeability to plasma proteins (e.g., LDL, fibrinogen).
      • ↓ Vasodilators (e.g., Nitric Oxide), ↑ Vasoconstrictors (e.g., Endothelin-1).
    • Vascular remodeling (maladaptive changes):
      • Smooth muscle cell (SMC) proliferation, hypertrophy, & migration.
      • ↑ Extracellular matrix (ECM) deposition (e.g., collagen, fibronectin).
      • Results in arterial wall thickening, luminal narrowing, and increased vascular stiffness.

Hypertension and Arterial Stiffness Relationship

Vessel Morphology - Morphologic Mayhem

Hypertension inflicts structural damage primarily on arterioles (arteriolosclerosis) and arteries.

  • Arteriolosclerosis: Two main forms:

    FeatureHyaline ArteriolosclerosisHyperplastic Arteriolosclerosis
    Associated HTNBenign hypertension, Diabetes Mellitus, agingSevere/Malignant hypertension (e.g., DBP > 120 mmHg)
    PathogenesisChronic stress → endothelial injury, plasma protein leakage (hyalinosis), ↑SMC matrix.Severe ↑BP → endothelial injury, SMC proliferation, reduplicated BM.
    MicroscopyHomogeneous, pink, glassy hyaline thickening of arteriolar wall; luminal narrowing."Onion-skin" concentric, laminated thickening; luminal narrowing/obliteration. Fibrinoid necrosis (necrotizing arteriolitis) may occur.
    Key Sites/EffectsKidney (benign nephrosclerosis), spleen.Kidney (malignant nephrosclerosis → "flea-bitten kidney"), retina.

Hyaline vs Hyperplastic Arteriolosclerosis

⭐ Hyperplastic arteriolosclerosis, characterized by 'onion-skin' thickening of arteriolar walls, is a hallmark of severe or malignant hypertension.

  • Larger Arteries (e.g., aorta, cerebral, coronary, renal arteries):
    • Accelerated atherosclerosis, leading to complications like MI, stroke.
    • Increased risk of aortic dissection and cerebrovascular hemorrhage (e.g., Charcot-Bouchard microaneurysms).

Target Organ Damage - Systemic Strike

  • Heart:
    • Left Ventricular Hypertrophy (LVH): concentric, from chronic pressure overload.
    • Accelerated Coronary Artery Disease (CAD).
    • ↑ Risk: Ischemic Heart Disease (IHD), Congestive Heart Failure (CHF), arrhythmias, sudden cardiac death.
    • Aortic dissection.
  • Brain:
    • Lacunar infarcts: small lesions (basal ganglia, thalamus, pons) from hyaline arteriolosclerosis of deep penetrating arteries.
    • Hypertensive encephalopathy: sudden, severe BP ↑; headache, confusion, convulsions.
    • Intracerebral hemorrhage:

      ⭐ Charcot-Bouchard microaneurysms (lenticulostriate vessels in basal ganglia, thalamus, pons, cerebellum) rupture.

  • Kidneys (Nephrosclerosis):
    • Benign Nephrosclerosis: Hyaline arteriolosclerosis → glomerular ischemia, glomerulosclerosis, tubular atrophy → granular contracted kidneys.
    • Malignant Nephrosclerosis (Accelerated HTN): Fibrinoid necrosis, hyperplastic "onion-skin" arteriolosclerosis → "flea-bitten" kidney, Acute Renal Failure (ARF).
  • Retina (Hypertensive Retinopathy):
    • Arteriolar narrowing, copper/silver wiring.
    • Arteriovenous (AV) nicking.
    • Hemorrhages (flame, dot-blot), cotton-wool spots (nerve fiber infarcts).
    • Grade IV: Papilledema. Hypertensive Retinopathy Phases and Manifestations

High‑Yield Points - ⚡ Biggest Takeaways

  • Benign hypertension causes hyaline arteriolosclerosis (homogenous, glassy pink arteriolar wall thickening).
  • Malignant hypertension: hyperplastic arteriolosclerosis ("onion-skinning" of arterioles) and fibrinoid necrosis.
  • Kidneys: Benign nephrosclerosis (shrunken, granular surface); Malignant nephrosclerosis ("flea-bitten kidney" with petechiae, fibrinoid necrosis).
  • Major risk for atherosclerosis, aortic dissection, cerebrovascular accidents (especially lacunar infarcts), and left ventricular hypertrophy (LVH).
  • Essential (primary) hypertension (90-95%) is idiopathic; secondary hypertension has identifiable causes (e.g., renal, endocrine).

Practice Questions: Hypertensive Vascular Disease

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