heart arrhythmia

A 16-year-old South Carolina boy consumed a large Diet Mountain Dew, a cafe latte from McDonald’s, and an energy drink within the course of 2 hours, and it evidently cost him his life. [1]
Davis Allen Cripe’s caffeine splurge likely caused deadly a heart arrhythmia, according to Richland County coroner Gary Watts.

“It was too much caffeine at the time of his death that it caused his arrhythmia.”

The Mayo Clinic explains heart arrhythmias this way:

Atrial fibrillation, or AFib, affects between 2.7 and 6.1 million people in the United States. Approximately 9% of people over the age of 65 are afflicted with this heart condition. [2]
AFib is the most common type of heart arrhythmia. The disorder occurs when the heart beats too slowly, too quickly, or in an irregular way, and the blood doesn’t flow properly from the atria to the lower two ventricles of the heart. It can be an off-and-on occurrence, or it can be permanent. [1]