Inhaling irritant that mimics air pollution changes defensive heart-lung reflex for hypertension

Air pollution significantly increases the risk for premature deaths, particularly in people with underlying cardiovascular disease, clinical and epidemiological studies have determined.

In healthy people, inhaling ozone or particle pollution triggers a defensive lung-heart reflex (pulmonary-cardiac reflex) that automatically slows heart rate to accommodate oxygen deficiency and help slow distribution of pollutants throughout the body. Yet, when patients with cardiovascular diseases breathe pollutants that same protective mechanism does not kick in. Instead, their heart rates intermittently speed up, known as tachycardia, and can evoke a potentially deadly irregular heart rhythm, known as premature ventricular contractions.

What accounts for the difference? University of South Florida Health (USF Health) researchers who study the role of sensory airway nerves in protective behaviors wanted to know.

Full story at news-medical.net

Can exercise lower blood pressure as effectively as drugs?

Millions of people live with high blood pressure, which can place them at risk of developing cardiovascular diseases. For this condition, doctors typically prescribe blood-lowering drugs, but could exercise help just as well?

According to the Centers for Disease Control and Prevention (CDC), approximately 75 millionadults in the United States have to manage high blood pressure, where it exceeds the threshold of 140 millimeters of mercury (mm Hg).

The condition can increase their risk of developing heart disease or experiencing a stroke, both of which are leading causes of death in the U.S.

Full story at Medical News Today