Hemodynamic disorders: Aortic coarctation
This congenital vascular anomaly requires special medical attention as it represents one of the most insidious causes of secondary hypertension.
- At-risk group: In the vast majority of cases, the pathology is diagnosed in young patients. It is often an incidental finding during a routine medical check-up or health screening, as young people may remain asymptomatic for a long time.
- Diagnostic minimum: The key and mandatory procedure when suspecting this defect is measuring blood pressure in both the upper and lower extremities.
- Pathognomonic sign: The classic presentation of coarctation features a paradoxical blood pressure distribution—showing high readings in the arms with normal or even reduced values in the legs.
Adrenal medulla pathology: Pheochromocytoma
Pheochromocytoma is a hormonally active tumor originating from the adrenal medulla. Its pathogenetic effect is driven by the massive, uncontrolled secretion of catecholamines into the bloodstream.
Clinical presentation Contrary to popular belief, the clinical picture can be heterogeneous:
- Paroxysmal course: The classic variant, manifesting as severe hypertensive crises (paroxysms).
- Stable course: In half of the patients, blood pressure remains persistently elevated without sharp spikes.
The attack is usually accompanied by prominent autonomic symptoms: profuse sweating, pronounced palpitations, and tachycardia.
Diagnostic algorithm
- Laboratory workup: Based on detecting high catecholamine levels. Testing is performed on 24-hour urine or blood plasma (highest diagnostic yield is achieved when blood is drawn directly during a hypertensive attack).
- Imaging: Computed tomography (CT) and magnetic resonance imaging (MRI) are used for precise topical diagnosis of the tumor. Ultrasound (US) is considered a less effective method in this case.
Adrenal cortex involvement: Conn's syndrome
Primary hyperaldosteronism (also known as Conn's syndrome) develops as a result of a tumor forming in the adrenal cortex. This neoplasm begins to autonomously and excessively secrete aldosterone.
Classic clinical triad:
- Persistent arterial hypertension.
- Neuromuscular disorders, manifested as sudden attacks of muscle weakness, paresthesias (numbness or tingling sensations), and even transient paralysis.
- Renal symptoms, primarily polyuria (increased urine output).
Laboratory criteria and differential diagnosis The main routine marker of Conn's syndrome is persistent hypokalemia (decreased serum potassium concentration). To confirm the diagnosis, elevated urinary aldosterone excretion is determined using radioimmunoassay. The crucial criterion distinguishing primary hyperaldosteronism from secondary is low plasma renin activity. Instrumental tumor localization is performed similarly to the pheochromocytoma protocols (CT and MRI).
Hypercortisolism: Cushing's syndrome
Cushing's syndrome develops due to chronic hyperproduction of glucocorticoids by the adrenal cortex. This condition profoundly affects the patient's appearance and systemic hemodynamics.
Clinical manifestations:
- Consistently high blood pressure.
- Development of specific dysplastic obesity, hallmark features of which include a "moon" facies.
- Typical skin changes—the appearance of broad purple striae (stretch marks), predominantly localized on the lateral surfaces of the torso.
Etiological structure: The development of the syndrome can be triggered by several factors. These include primary tumors of the adrenals themselves (true hypercortisolism), as well as neoplasms in other locations secreting adrenocorticotropic hormone (ACTH) or ACTH-like substances. An iatrogenic cause is distinguished separately—the syndrome develops against the background of long-term glucocorticoid therapy.
Renal arterial hypertension
In addition to endocrine and vascular causes, a massive share consists of symptomatic arterial hypertension of renal origin. Traditionally, this category is divided into two main groups, classified directly according to the exact localization of the pathological process within the renal structures or their vascular bed.
Briefly: answers to topical questions
What are the two main groups of renal arterial hypertension distinguished in the classification?
Depending on the localization of the pathological process, two main groups of renal arterial hypertension are distinguished. These include:
- Renal (parenchymal) — caused by damage to the renal tissue (occurs in glomerulonephritis, pyelonephritis, polycystic kidney disease, and renal tumors).
- Renovascular — associated with impaired blood flow in the renal arteries (develops due to vascular malformations, fibromuscular dysplasia, and systemic vasculitis).
What specific hormones (catecholamines) does a pheochromocytoma secrete?
Pheochromocytoma secretes catecholamines such as adrenaline and noradrenaline. It is a benign hormone-producing tumor most commonly localized in the adrenal medulla. Increased secretion of these hormones leads to elevated blood pressure, which usually presents as crises (paroxysms), although stable hypertension is observed in half of the patients.
Conn's triad: Hypertension (vessels), Paresthesias/paralysis (muscles), Polyuria (kidneys). Laboratory findings: low potassium, low renin, high aldosterone.
Class and exam questions
How to differentiate primary and secondary hyperaldosteronism?
The key distinction lies in plasma renin activity. In primary hyperaldosteronism (Conn's syndrome), renin activity is low, whereas in secondary hyperaldosteronism, it predictably increases.
Does pheochromocytoma always present with sudden crises?
No, the classic paroxysmal course with crises is far from always observed. According to statistics, 50% of patients with this tumor exhibit a stable form of arterial hypertension without marked spikes.
Which imaging diagnostic method is preferred for detecting adrenal tumors?
Computed tomography (CT) and magnetic resonance imaging (MRI) are recognized as the gold standard for adrenal imaging. Ultrasound (US) is considered a less effective and less accurate method in this case.
What lies behind the iatrogenic cause of Cushing's syndrome?
Iatrogenic Cushing's syndrome arises due to prolonged, systematic intake of glucocorticoid medications by the patient, which mimics adrenal cortex hyperfunction.
What else to study on this topic
- Classification of arterial hypertension of renal origin by the localization of the process.
- Features of the radioimmunoassay method for determining aldosterone.
- Topical diagnosis of extra-adrenal ACTH-secreting tumors.
- Pathogenesis of muscular and renal manifestations associated with hypokalemia in Conn's syndrome.
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