Oral Bacteria Linked to Heart Attack Risk, New Research suggests
A new study from Finnish scientists indicates a connection between chronic bacterial infections originating in the mouth and the growth of heart attacks. Researchers discovered that Viridans streptococci, common bacteria found in the oral cavity, can evade the immune system by forming biofilms within hardened arteries (arteriosclerosis).
The findings, published in the Journal of the American Heart Association, analyzed tissue samples from 121 individuals who died suddenly of heart attacks, and also samples from 96 patients undergoing vascular surgery. DNA of Viridans streptococci was detected in 42% of the coronary arteries examined.These bacteria aren’t typically harmful in the mouth, but the study reveals they can establish a hidden presence within arteriosclerosis. The bacteria organise themselves into biofilms – slimy, protective layers that shield them from immune detection. While normally cleared by the immune system, these biofilms appear to thrive in damaged coronary arteries, effectively creating a safe haven.
When a biofilm becomes active, it releases more aggressive bacteria that are recognized by the immune system. This triggers an inflammatory response, attacking the protective cap over the arteriosclerosis, potentially causing it to rupture and lead to a heart attack.
viridans streptococci can enter the bloodstream during common dental procedures like brushing, root canals, and plaque removal. This highlights the importance of maintaining good oral hygiene. Previous research by the same team demonstrated a correlation between poor dental health and sudden cardiac death.
