How specific hypertensions arise: volume loading, Goldblatt kidney, obesity, neurogenic and monogenic
- Mechanism
- For completeness
Each kind of high blood pressure ends the same way: the kidney needs a higher pressure to excrete the salt it receives.
Also called: Goldblatt hypertension, Renovascular hypertension, Obesity hypertension, Monogenic hypertension
See it in 3D: Kidneys · Left renal artery · Left adrenal gland
What it is
Experimental and clinical forms of hypertension share one final mechanism: the renal output curve moves to a higher pressure. Reduced kidney mass plus salt causes volume-loading hypertension; a clamped renal artery causes renin-dependent (two-kidney) or volume-dependent (one-kidney) Goldblatt hypertension. Obesity raises sympathetic activity, angiotensin II and renal compression, and rare single-gene disorders cause low-renin hypertension by excess distal sodium reabsorption.
How it works, step by step
- Any cause that makes the kidney retain more sodium at a given pressure shifts the renal output curve to the right.
- Salt and water are retained until extracellular volume and output rise.
- Tissues receive more flow than they need, so local autoregulation constricts arterioles over days to weeks (higher resistance).
- Output returns near normal while resistance and pressure stay high; the higher pressure lets the kidney excrete normal intake (pressure natriuresis).
- In renin-dependent forms, angiotensin II both constricts vessels and retains sodium directly, so pressure rises without large volume change.
Models compared
| Type | Renin | Main driver |
|---|---|---|
| Reduced renal mass + salt | Low | Volume |
| Two-kidney, one-clip Goldblatt | High | Angiotensin II from the clipped kidney |
| One-kidney, one-clip Goldblatt | High, then normal | Volume after early renin rise |
| Renin-secreting tumour | Very high | Angiotensin II |
| Primary aldosteronism | Low | Aldosterone, sodium retention |
| Obesity | Normal or high | Sympathetic, RAAS, renal compression |
| Liddle syndrome | Low (aldosterone low) | Gain of function of ENaC |
| Neurogenic (e.g. acute baroreceptor denervation, pheochromocytoma) | Variable | Sympathetic or catecholamine excess |
Clinical notes
- Renal artery stenosis (atherosclerosis in older adults, fibromuscular dysplasia in younger women) is the human counterpart of Goldblatt hypertension.
- In bilateral renal artery stenosis or a single kidney, blocking angiotensin II can sharply lower GFR, because filtration depends on efferent constriction.
- Obstructive sleep apnea adds nightly sympathetic activation to obesity-related hypertension.
Test yourself
Think of the answer, then tap the question to see it.
Why is renin high in two-kidney, one-clip but not, later, in one-kidney, one-clip Goldblatt hypertension?
With two kidneys the normal kidney excretes extra sodium, so volume does not expand and the clipped kidney keeps secreting renin; with one kidney volume expands and renin falls back.
In volume-loading hypertension, why does cardiac output return near normal while pressure stays high?
Excess flow to tissues triggers long-term autoregulation, which constricts arterioles; resistance rises, output returns, and pressure stays high.
What is the defect in Liddle syndrome, and what are renin and aldosterone?
A gain-of-function mutation of the collecting-duct sodium channel (ENaC) retains sodium; volume expansion suppresses both renin and aldosterone.
Which three mechanisms link obesity to hypertension?
Higher sympathetic renal activity (partly via leptin), more angiotensin II and aldosterone, and compression of the kidneys by visceral and perirenal fat.
Connections
See it in 3D3
The structures of Durgical's 3D anatomy where it happens.
In Biochemistry2
In Pharmacology2
Educational physiology content; not a diagnostic or treatment guide and no substitute for a health professional's advice. Values are approximate references. No doses are given.
Sources: Renovascular hypertension: MedlinePlus Medical Encyclopedia (MedlinePlus, US National Library of Medicine, 2026); Liddle syndrome: MedlinePlus Genetics (MedlinePlus, US National Library of Medicine, 2026); Epidemiologic and Etiologic Considerations of Obesity (StatPearls (NCBI Bookshelf), 2024); Essential Hypertension (StatPearls (NCBI Bookshelf), 2023).
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Representative model, for educational purposes only.