People with ADHD were considered to have DESR if they also reported emotional-control symptoms that were worse than those reported by 95% of a large comparison group of people without ADHD. More than half of those with ADHD enrolled in the study (55%) were also emotionally reactive.
If stress itself is a risk factor for heart disease, it could be because chronic stress exposes your body to unhealthy, persistently elevated levels of stress hormones like adrenaline and cortisol. Studies also link stress to changes in the way blood clots, which increases the risk of heart attack.
1 Immune system. Constant stress can make you more likely to get sick more often. And if you have a chronic illness such as AIDS, stress can make your symptoms worse.  Heart. Stress is linked to high blood pressure, abnormal heartbeat (arrhythmia), blood clots, and hardening of the arteries (atherosclerosis).