You had the EKG. The echocardiogram. Maybe a Holter monitor or a stress test. Everything came back normal, and you were told your heart is fine. But you still can’t stand in line without your heart racing and your vision graying out.
A normal cardiac workup is good news about your heart’s structure and rhythm. It doesn’t rule out dysautonomia.
What standard heart tests look for
- EKG: the heart’s electrical rhythm at rest, for a few seconds.
- Echocardiogram: heart structure and pumping function.
- Holter or event monitor: rhythm over days or weeks.
- Stress test: how the heart responds to exercise, mainly looking for blocked arteries.
These tests are important for ruling out serious heart disease, and anyone with fainting or palpitations should have appropriate cardiac evaluation.
What they aren’t designed to catch
Dysautonomia is a problem with the control system, not the heart itself. In POTS and orthostatic intolerance, the heart is typically structurally normal. The problem appears when the autonomic nervous system fails to adjust blood vessels, heart rate, and blood pressure to a change in position.
- Most tests are done lying down or sitting. The defining findings in POTS and orthostatic hypotension appear with standing.
- A Holter monitor may show a fast heart rate, which can be labeled “sinus tachycardia” without anyone connecting it to posture.
- Stress tests measure exercise response, not the response to simply standing still.
Other things normal tests can miss
- Small fiber neuropathy, which can involve autonomic nerves and requires a skin biopsy or specialized testing to detect.
- Sweating and temperature regulation problems, which require autonomic sweat testing.
- Blood volume and blood pooling issues, which don’t show up on standard imaging.
What a more complete evaluation includes
- Orthostatic vital signs: heart rate and blood pressure lying down and then standing for up to 10 minutes.
- A symptom pattern review: whether symptoms change with posture, heat, meals, or exertion.
- A fresh read of existing results: for example, whether a Holter’s fast heart rates line up with times you were upright.
- Formal autonomic testing when needed. See autonomic testing explained.
- Screening for related conditions: hypermobility, mast cell activation, small fiber neuropathy, and autoimmune disease.
When to get emergency care
Normal prior tests don’t rule out a new problem. Call 911 for:
- chest pain,
- fainting during exercise or while lying down,
- palpitations followed by fainting, or
- shortness of breath at rest.
Serving Oklahoma City, Tulsa, and all of Oklahoma
Venturis Clinic sees patients from Oklahoma City and surrounding areas, including Tulsa, and from across Oklahoma. Learn more on our Dysautonomia in Oklahoma City page.
Frequently asked questions
My cardiologist says my heart is fine. Could it still be dysautonomia?
Yes. Dysautonomia typically occurs with a structurally normal heart.
Should I bring my old test results?
Yes. Prior EKGs, echocardiograms, and monitor reports help avoid repeat testing and can reveal patterns.
What test shows dysautonomia?
Standing or tilt table tests are key for POTS and orthostatic hypotension. Other autonomic tests assess sweating, heart rate variability, and nerve function.
Does a normal stress test rule out POTS?
No. A stress test measures exercise response, not the response to standing.
Told your heart is fine but you still feel awful? Book a free 15-minute discovery call, or learn more about dysautonomia care in Oklahoma City.
This page is for educational purposes and is not a substitute for individual evaluation.
By Alvin Philipose, DC, ICCP
Sources
- Sheldon RS, et al. 2015 Heart Rhythm Society expert consensus statement on POTS, inappropriate sinus tachycardia, and vasovagal syncope. Heart Rhythm. 2015;12(6):e41–e63.
- Freeman R, et al. Clinical Autonomic Research. 2011;21(2):69–72.