Long COVID Atlas
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Plain-language first, with specialist detail below. For understanding, not medical advice.

Long COVID Atlas › Glossary › Baroreflex

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Baroreflex

https://longcovidatlas.org/glossary/baroreflex

In plain language

What it is

Your body's automatic system for keeping blood pressure steady second to second, using pressure sensors in your arteries.

Why it matters

When it fails, blood pressure stops being buffered and can swing suddenly, surging then dropping.

Think of it like

A thermostat for blood pressure: it senses a drift and corrects it before you notice.

Healthy: the baroreflex holds the line safe range small drifts get corrected within seconds Long COVID: the buffer fails same range, no longer held surge drop
Normally a fast reflex, the baroreflex, senses your blood pressure and corrects small drifts within seconds, holding it inside a narrow range. After COVID this buffer can fail, so the same pressure that used to stay level now swings, surging above the range and dropping below it. The swings are the failure of the control system, not a sign that you are doing something wrong.

For specialists

Formal definition

A fast negative-feedback reflex: arterial baroreceptors sense pressure, signal the brainstem, and adjust heart rate and vessel tone to hold blood pressure within a narrow range.

Mechanism

Damage to the sensing (afferent) limb, as reported after COVID, removes beat-to-beat buffering and produces large blood-pressure variability.

Sources

Related terms

DysautonomiaLabile blood pressurePOTS