Hypertensive Heart Disease
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Direct answer
Hypertensive heart disease is left ventricular hypertrophy arising directly from systemic hypertension in the absence of any other cardiac lesion. Chronic pressure overload produces a thick-walled, small-cavity, heavy left ventricle — concentric hypertrophy — which initially maintains output but causes diastolic dysfunction and, later, systolic failure, often with relative myocardial ischaemia and atrial fibrillation. At arteriolar level the same hypertension produces hyaline arteriolosclerosis in the benign phase and hyperplastic (onion-skin) arteriolosclerosis with fibrinoid necrosis in the malignant phase.
What you must remember
- Concentric hypertrophy: symmetrical wall thickening (commonly above 15 mm) with a reduced cavity and increased heart weight, driven by pressure overload and trophic signals such as angiotensin II; myocytes enlarge with boxcar nuclei while the vascular supply lags.
- Consequences: diastolic dysfunction with exertional dyspnoea, angina from demand-supply mismatch despite patent coronaries, atrial fibrillation, and eventual dilatation with systolic heart failure.
- Left-sided versus right-sided: systemic hypertension thickens the left ventricle; pulmonary hypertension thickens the right ventricle (cor pulmonale), the latter defined as right ventricular hypertrophy or failure from pulmonary causes.
- Hyaline arteriolosclerosis: pink, homogeneous protein deposition in arteriolar walls of benign hypertensives and, prominently, of diabetics; narrows the lumen and underlies benign nephrosclerosis.
- Hyperplastic arteriolosclerosis: laminated, concentric, onion-skin thickening by smooth muscle and collagen in malignant hypertension; often accompanied by fibrinoid necrosis with acute inflammation (necrotising arteriolitis), producing malignant nephrosclerosis with retinal changes and renal failure.
- Target-organ disease: hypertensive nephrosclerosis, lacunar strokes and Charcot-Bouchard microaneurysms of lenticulostriate vessels, hypertensive encephalopathy, and aortic dissection association.
- Management direction: blood-pressure control with lifestyle measures and drug therapy per current guidance, which regresses hypertrophy and reduces complications — the framings echoed in India's national programme for hypertension.
Common confusion
Concentric versus eccentric hypertrophy is the standard contrast: pressure overload (hypertension, aortic stenosis) lays down parallel sarcomeres and thickens the wall with a small cavity, whereas volume overload (valvular regurgitation, dilated cardiomyopathy) adds sarcomeres in series, dilating the ventricle and thinning the relative wall thickness. Students also mislabel hyaline arteriolosclerosis as atherosclerosis — the former affects arterioles with homogeneous pink protein, the latter the intima of large and medium arteries with lipid plaques. Cor pulmonale strictly means right ventricular pathology from pulmonary hypertension, not left heart failure.
Exam-focused takeaway
Questions arrive as pathology photographs of a small-cavity thick left ventricle, onion-skin arterioles, or a young man with malignant hypertension and fibrinoid necrosis on renal biopsy. Clinical stems pair breathlessness with a fourth heart sound and preserved ejection fraction, asking for diastolic dysfunction from concentric hypertrophy. Expect one-liners on Charcot-Bouchard aneurysms in hypertensive intracerebral haemorrhage and on which vessel layer each arteriolosclerosis affects.
Frequently asked questions
What defines hypertensive heart disease?
Left ventricular hypertrophy attributable to systemic hypertension alone, with no other structural cardiac lesion to explain it.
How do hyaline and hyperplastic arteriolosclerosis differ?
Hyaline disease is smooth homogeneous protein in arteriolar walls of benign hypertension and diabetes, while hyperplastic disease is concentric laminated onion-skin thickening of malignant hypertension, sometimes with fibrinoid necrosis.
Why does the hypertrophied ventricle fail?
Capillary density does not keep pace with muscle mass, so the wall is relatively ischaemic, stiff and prone to diastolic dysfunction, arrhythmia and eventual systolic failure.
What is cor pulmonale?
Right ventricular hypertrophy or failure secondary to pulmonary hypertension from lung or pulmonary vascular disease.
What are Charcot-Bouchard aneurysms?
Minute miliary aneurysms on lenticulostriate perforators in chronic hypertension whose rupture causes putaminal or thalamic intracerebral haemorrhage.