For decades, modern medicine has evaluated cardiovascular health through a relatively straightforward lens: the average blood pressure reading. Doctors routinely check whether systolic and diastolic numbers fall within healthy parameters, using these averages to gauge a patient’s risk for heart disease, stroke, and other serious medical events. However, a growing body of clinical evidence suggests that focusing solely on average values may overlook a critical piece of the puzzle. Rapid or excessive fluctuations in blood pressure throughout the day can independently drive up the risk of severe cardiovascular and neurological complications, even when a patient’s overall average readings appear entirely normal.
Now, a team of researchers at the University of Virginia School of Medicine has uncovered a vital piece of the biological machinery that prevents these dangerous spikes and drops. In a study published in the scientific journal Circulation Research, investigators identified a small population of specialized nerve cells located within the brainstem that plays a fundamental role in maintaining steady blood pressure. The brainstem is universally recognized as the control center for essential, involuntary bodily functions, and these newly studied neurons appear to act as a stabilizing force, reining in erratic blood pressure swings as individuals transition through the unpredictable demands of daily life—from sleeping and waking to standing up and exercising.
The discovery shifts traditional perspectives on how clinicians should approach cardiovascular stability. According to the researchers, the loss or impairment of just a fraction of these specific neurons can compromise the body’s delicate regulatory network, causing significant instability even if standard clinical measurements indicate a normal mean blood pressure.
"What we found is that a loss of just a few hundred nerve cells leads to unstable blood pressure even though the mean blood pressure was normal," said Dr. Stephen Abbott, a researcher at the University of Virginia and the lead investigator of the study. "This shows that the system that keeps blood pressure steady from moment to moment is no longer working."
A Hidden Brain Mechanism Behind Blood Pressure Problems
The identification of these critical nerve cells sheds light not only on general vascular health but also on specific, debilitating neurological disorders. Previously, researchers documented that these exact same nerve cells are frequently damaged or entirely missing in individuals suffering from multiple system atrophy, a rare and fatal neurodegenerative disorder that shares clinical features with Parkinson’s disease. One of the hallmark complications of multiple system atrophy is profound and disabling difficulty in regulating blood pressure, which often leaves patients vulnerable to dangerous drops upon standing and erratic shifts throughout the day.
The new findings from the University of Virginia raise the distinct possibility that subtle disruptions or dysfunctions involving these precise brain cells may also contribute to unstable blood pressure across a broader spectrum of medical conditions. Crucially, this mechanism may operate silently in patients who exhibit normal average blood pressure readings during standard clinical evaluations, masking an underlying vulnerability that traditional diagnostics fail to capture.
By illuminating how the central nervous system controls moment-to-moment vascular tone, the research opens new pathways for medical science. In the future, a deeper understanding of this neural circuit could guide researchers in developing targeted therapeutic interventions designed specifically to dampen harmful blood pressure fluctuations and shield patients from their downstream neurological and cardiovascular consequences.
"Our work emphasizes a new appreciation for how we think about blood pressure problems," Abbott noted, emphasizing the paradigm shift required by the data. "It’s not just about lowering the numbers—it’s about keeping blood pressure stable from moment to moment."
New Research Could Change How Blood Pressure Is Treated
The study in Circulation Research was carried out by a collaborative team of scientists at the University of Virginia, including George M.P.R. Souza, Harsha Thakkalapally, Faye E. Berry, Leah F. Wisniewski, Ulrich M. Atongazi, Daniel S. Stornetta, and lead investigator Stephen Abbott. The research team formally reported no financial interests or conflicts of interest related to the publication of their findings.
Financial backing for the project was provided by the federal government through the National Institutes of Health under grant number HL148004, reflecting the ongoing national priority placed on uncovering the fundamental neural mechanisms underlying cardiovascular disease.
This discovery also aligns closely with the broader institutional mission of the University of Virginia’s newly established Paul and Diane Manning Institute of Biotechnology. The institute is dedicated to accelerating research into complex, difficult-to-treat diseases, bridging the gap between basic laboratory science and translational medicine to help promising biological discoveries move more rapidly toward potentially lifesaving therapies for patients in need.