University of Virginia research links brain cell loss to blood pressure instability

Researchers at the University of Virginia School of Medicine have discovered that the loss of only a few hundred neurons in the brainstem can cause significant blood pressure instability. The study, published in Circulation Research, suggests that even when average blood pressure readings appear to be within healthy clinical ranges, sudden fluctuations can still pose cardiovascular and neurological risks.

The identified neurons, located in the brainstem, act as a natural damping system that smooths out pressure variations during daily activities such as sleeping, waking, or exercising. Led by Stephen Abbott, the team found that the absence of these specific cells prevents the body from regulating vascular tone and heart rate effectively during transitions in posture or activity.

This instability, characterized by sudden spikes and drops in pressure, may escape detection during standard medical examinations that rely on single-point measurements. The findings provide a potential mechanism for why rapid pressure variations are considered independent risk factors for heart disease and stroke, even in patients with normal average blood pressure.