ELI5'ing the abstract, some mice were put in a noisy environment for 4 days. This caused their blood vessels to become more inflamed and allowed more cells that cause inflammation into their hearts. When the mice had a heart attack, the inflammation was worse if they had been exposed to the noise before. People who live in noisy areas and then have a heart attack also have worse outcomes. This study suggests that reducing noise pollution could help people who have heart attacks.

Disclaimer: I don't know what I'm talking about, I used a bot to simplify for me.