Brain Region Linking Breathing & Blood Pressure: New Hope for Hypertension Treatment

A newly discovered region deep within the brainstem may play a critical role in regulating blood pressure, offering potential new avenues for treating hypertension. Researchers at the University of Auckland have identified the lateral parafacial region (LPFR) as a key area influencing blood pressure through its connection to both breathing patterns and blood vessel control. This finding, published in Circulation Research, suggests that how we exhale – particularly forceful exhalations – can directly impact our blood pressure, and that targeting this brain region could offer a novel therapeutic approach.

The Brain’s Breathing-Blood Pressure Connection

The LPFR resides in the brainstem, the most ancient part of the brain responsible for essential automatic functions like digestion, breathing, and heart rate. Professor Julian Paton, lead researcher and director of Manaaki Manawa, Centre for Heart Research at the University of Auckland, explains that the LPFR is activated during forceful exhalations – those we use when laughing, coughing, or exercising. These exhalations rely on the powerful contraction of abdominal muscles, a different mechanism than the passive elasticity of the lungs during normal breathing.

The research team discovered that this region doesn’t just control breathing. it similarly connects to the nerves that constrict blood vessels. When the LPFR is activated, these nerves trigger blood vessel tightening, leading to increased resistance to blood flow and, elevated blood pressure. In experiments, when researchers inactivated the LPFR, blood pressure returned to normal levels, strongly suggesting a causal link.

How Breathing Patterns Influence Hypertension

The study highlights a potential connection between specific breathing patterns and the development or exacerbation of high blood pressure. Forceful exhalations, involving strong abdominal muscle contractions, appear to be a key trigger. This suggests that identifying and modifying these breathing patterns in individuals with hypertension could be a valuable component of treatment. The researchers propose that a diagnosis of abdominal breathing in patients with high blood pressure could reveal the underlying cause and guide appropriate interventions.

This isn’t the first time researchers at the University of Auckland have uncovered a novel mechanism related to blood pressure regulation. In August 2025, the same team identified the carotid body, a small organ in the neck, as another contributor to hypertension. The carotid body responds to low oxygen levels by stimulating the brain’s ‘fight or flight’ response, which can also raise blood pressure. This earlier research suggested that current medications, which primarily focus on lowering blood pressure, may not address the root cause in all patients, leaving them at continued risk of cardiac events like heart attack and stroke.

Beyond the Brainstem: The Role of Carotid Bodies

The current study builds on this understanding by revealing a brain-based mechanism that interacts with the carotid bodies. The researchers found that signals activating the LPFR originate not only within the brain itself but also from the carotid bodies. These small organs, located near the carotid artery in the neck, act as oxygen sensors, monitoring blood oxygen levels. As the carotid bodies lie outside the brain, they represent a potentially more accessible and safer target for therapeutic intervention.

The research team is currently exploring ways to reduce the activity of these carotid bodies, which could indirectly dampen the activity of the LPFR and lower blood pressure. They are investigating the potential of repurposing existing medications that have been shown to reduce carotid body activity. But, directly targeting specific areas within the brain with medication remains a significant challenge, as most drugs affect the entire brain rather than a single region.

Implications for Sleep Apnea and Hypertension

The findings may be particularly relevant for individuals with sleep apnea, a condition characterized by temporary pauses in breathing during sleep. These pauses lead to decreased oxygen levels, activating the carotid bodies and potentially triggering the LPFR, contributing to elevated blood pressure. Understanding this connection could lead to more effective treatment strategies for individuals with both sleep apnea and hypertension.

What’s Next: Refining Treatments and Expanding Research

The University of Auckland team is continuing to investigate the complex interplay between the brain, carotid bodies, and blood pressure regulation. Future research will focus on refining therapeutic approaches that target both the LPFR and the carotid bodies. This includes exploring the potential of non-pharmacological interventions, such as breathing exercises designed to minimize forceful exhalations, as a complementary strategy for managing hypertension. Further studies are also needed to confirm these findings in larger and more diverse populations, and to determine the long-term effects of targeting these specific brain and neck regions.

The discovery of the LPFR’s role in blood pressure regulation represents a significant step forward in our understanding of hypertension. While more research is needed, this finding offers hope for the development of more targeted and effective treatments for this widespread and often debilitating condition. Individuals concerned about their blood pressure should consult with a qualified healthcare professional for personalized advice and management strategies. You can find more information about hypertension and its management from the Centers for Disease Control and Prevention and the National Heart, Lung, and Blood Institute.