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Arterial Hypotension

Q: What clinical symptoms are most typical for patients with arterial hypotension?

While the source text does not provide a general list of typical symptoms for isolated hypotension, it describes clinical manifestations accompanying pressure drops in various pathologies: Syncope and collapse — develop due to systemic circulatory insufficiency (e.g., in adrenal insufficiency).Muscle weakness and increased fatigue — characteristic of hypotension associated with hypoaldosteronism.Dizziness, somnolence, nausea, and muscle tremors — accompany acute arterial hypotension in dumping syndrome.Impaired consciousness and cardiac arrhythmias — may also occur during a sharp drop in blood pressure shortly after eating.

Q: What medications are used for the pharmacotherapy of arterial hypotension?

The source materials explicitly mention sympathomimetics for the pharmacological correction of arterial hypotension to normalize renal blood flow. If arterial hypotension is caused by hypovolemia or another reversible cause, non-glycoside inotropic drugs are not recommended until the underlying cause is resolved. For hypovolemia, CBV restoration is performed; the sources specifically mention: administration of isotonic sodium chloride solution.

Q: What blood pressure values are considered the criterion for hypotension?

Arterial hypotension is diagnosed when systolic blood pressure drops below 90–95 mm Hg and diastolic pressure falls below 50–60 mm Hg.

Q: How does primary hypotension differ from secondary hypotension?

Primary hypotension is an independent disease (essential hypotension), whereas secondary hypotension is merely a symptom or complication of another pathology (e.g., hypothyroidism or adrenal insufficiency).

Q: What is the mechanism of the BP drop in functional neurosis?

Prolonged stress activates the parasympathetic nuclei of the anterior hypothalamus. Enhanced parasympathetic influences decrease vascular tone (TPR) and myocardial contractility, causing a drop in cardiac output.

*Hypotensio arterialis*

For medical students2 min readUpdated 2026-10-10

Arterial hypotension (hypotensio arterialis) is a standard form of circulatory system pathology characterized by a persistent or episodic drop in blood pressure below the physiological norm. In clinical practice, the diagnosis is confirmed when systolic blood pressure drops below 90–95 mm Hg and diastolic pressure falls below 50–60 mm Hg.

BP ThresholdSystolic < 90–95, diastolic < 50–60 mm Hg

Pediatric Prevalence3% to 21%, with a peak during adolescence

Pathology FormsPhysiological and pathological

Primary FormAn independent disease known as essential hypotension

Classification and Etiological Variants

Arterial hypotension is typically categorized according to several key criteria:

By clinical course: physiological and pathological.
By origin (etiology):
Primary (centrogenic, neurogenic): represented by essential hypotension.
Secondary (symptomatic): manifestations of other underlying conditions, such as hypothyroidism, chronic primary adrenal insufficiency, neuroses, or circulatory failure.
By initial pathogenetic mechanism:
Neurogenic (subdivided into centrogenic and reflex);
Endocrine (adrenal, thyroid, pituitary);
Metabolic.

Pathogenesis of Neurogenic Hypotension

Neurogenic forms of hypotension develop due to disruptions at the central or conducting levels of hemodynamic regulation.

Centrogenic Hypotension

Functional variant (neurosis): triggered by prolonged psycho-emotional stress that suppresses motor and emotional responses. This leads to hyperactivation of the parasympathetic nuclei of the anterior hypothalamus and the entire parasympathetic nervous system. As a result, total peripheral resistance (TPR) and myocardial contractility decrease, leading to a drop in cardiac output.
Organic variant: develops due to traumatic brain injury, cerebral ischemia or venous hyperemia, as well as degeneration of the basal ganglia, extrapyramidal system, and the dorsal motor nucleus of the vagus nerve. Pressor sympathoadrenal influences decrease, parasympathetic tone dominates, arteriolar smooth muscle tone drops, and cardiac output declines.

Reflex (Conducting) Hypotension

This form is based on impaired conduction of vasoconstrictor impulses from the vasomotor center in the medulla oblongata along sympathetic pathways. This mechanism is observed in syringomyelia, amyotrophic lateral sclerosis (ALS), neurosyphilis, and diabetic or toxic neuropathies. The loss of sympathetic input leads to a sustained drop in TPR, a decrease in circulating blood volume (CBV), and reduced cardiac output.

Endocrine and Metabolic Forms

These forms are linked to a deficiency of pressor hormones or tissue metabolites.

Adrenal hypotension: resulting from trauma, hemorrhage, tuberculosis, or autoimmune adrenal destruction, accompanied by a shortage of catecholamines, mineralocorticoids, and glucocorticoids. This manifests as decreased arteriolar tone, lowered CBV, and reduced cardiac output.
Pituitary hypotension: associated with diminished effects of ACTH, ADH, TSH, and GH, resulting in decreased peripheral vascular tone, CBV, and cardiac output.
Metabolic hypotension: develops during chronic infections, intoxications, or prolonged starvation, causing tissue dystrophy. Insufficient synthesis of vasoconstrictor substances (endothelin, thromboxane $A_2$, prostaglandin F, angiotensinogen) leads to relaxation of the vascular smooth muscle.

Mnemonic

To remember the three main hemodynamic causes of decreased blood pressure, use the acronym RCO: Resistance (drop in TPR), Circulating volume (decreased CBV), Output (reduced myocardial cardiac output).

Frequently asked questions

What clinical symptoms are most typical for patients with arterial hypotension?

While the source text does not provide a general list of typical symptoms for isolated hypotension, it describes clinical manifestations accompanying pressure drops in various pathologies:

Syncope and collapse — develop due to systemic circulatory insufficiency (e.g., in adrenal insufficiency).
Muscle weakness and increased fatigue — characteristic of hypotension associated with hypoaldosteronism.
Dizziness, somnolence, nausea, and muscle tremors — accompany acute arterial hypotension in dumping syndrome.
Impaired consciousness and cardiac arrhythmias — may also occur during a sharp drop in blood pressure shortly after eating.

What medications are used for the pharmacotherapy of arterial hypotension?

The source materials explicitly mention sympathomimetics for the pharmacological correction of arterial hypotension to normalize renal blood flow.

If arterial hypotension is caused by hypovolemia or another reversible cause, non-glycoside inotropic drugs are not recommended until the underlying cause is resolved. For hypovolemia, CBV restoration is performed; the sources specifically mention:

administration of isotonic sodium chloride solution.

What blood pressure values are considered the criterion for hypotension?