Question explored with the scientific record
Conversation so far
- 1 is nausea in long covid considered a PEM + a private exchange
- 2 so what is nausea when i walk too fast or move to actively + a private exchange
- 3 PEM in long covid
- 4 exertion intolerance more than the classic delayed crash. so wha is the solution?
- 5 autonomic testing. a lying standing bp test was normal
Answered on this page ↓
autonomic testing. a lying standing bp test was normal
A normal lying-to-standing blood pressure test rules out one thing, not the whole autonomic system. It does not explain your nausea, and it does not clear you.
The test you had measures one branch: whether blood pressure drops when you stand. In a study of 180 post-COVID patients given a 3-minute standing test, about 14 in 100 had orthostatic hypotension and none met POTS criteria [1]. So a normal result is common and expected. It is not evidence that your autonomic nervous system is fine.
Autonomic problems in long COVID show up in other channels. Among 27 post-COVID patients referred for full autonomic testing, 63% had abnormalities and 22% met POTS criteria [1]. In 24 patients given a longer tilt test with a drug provocation, 23 had orthostatic intolerance, including 15 whose problem only appeared after nitroglycerin [1]. A short standing test can miss that. Heart rate matters too: children and young adults with post-COVID or post-vaccination symptoms had a standing heart rate rise of about 25 to 30 beats per minute versus 16 in healthy controls [3].
Nausea fits the autonomic picture through the gut. One conceptual paper proposes that vagus nerve dysfunction links gut motility problems with nausea-type symptoms, but it presents no data and is not assessable [2]. That is a hypothesis, not a finding.
| Test | What it catches | What it misses |
|---|---|---|
| Lying/standing BP | Orthostatic hypotension [1] | POTS, delayed intolerance [1] |
| Standing heart rate | POTS-type response [3] | Provoked intolerance [1] |
| Tilt test + drug | Delayed/provoked intolerance [1] | Not done in your case |
My call: a normal standing BP does not close the autonomic question. Ask for a standing heart rate measurement and, if symptoms persist, a full tilt-table test. Confidence: moderate that your test was incomplete for this purpose; low on whether autonomic dysfunction explains your nausea specifically.
Sources used 3
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Post-acute sequelae of SARS-CoV-2 syndrome presenting as postural orthostatic tachycardia syndrome
This narrative review reports that PASC can present as POTS, with reviewed studies showing variable rates of POTS and autonomic dysfunction, and that PASC and POTS symptoms overlap substantially, supporting recognition and treatment.
DOI: 10.15441/ceem.22.409 -
Autonomic Vulnerability as a Disease-Modifying Substrate in Post-Viral and Cardiac Injury Syndromes
This conceptual synthesis paper integrates six hypothesis papers proposing that cumulative physiological insults, such as viral infection, haemodynamic instability, and cardiac surgery, may progressively destabilize autonomic regulatory systems, leading to persistent multisystem…
DOI: 10.66311/3068-9139.02.02.13 -
Dysautonomia in Children with Post-Acute Sequelae of Coronavirus 2019 Disease and/or Vaccination
Children and young adults with post-COVID-19 or post-vaccination health problems show elevated heart rate, increased heart rate increase during standing, raised stress index, and reduced pNN20 values compared with healthy controls, consistent with dysautonomia.
DOI: 10.3390/vaccines10101686