The following is from March 1, 2001.

The interesting thing is that most cases of heart disease in the twentieth century are of a form that is new, namely heart attack or myocardial infarction—a massive blood clot leading to obstruction of a coronary artery and consequent death to the heart muscle. Myocardial infarction (MI) was almost nonexistent in 1910 and caused no more than 3,000 deaths per year in 1930. Dr. Paul Dudley White, who introduced the electrocardiograph machine to America, stated the following during a 1956 American Heart Association televised fund-raiser: “I began my practice as a cardiologist in 1921 and I never saw an MI patient until 1928.” By 1960, there were at least 500,000 MI deaths per year in the US. Rates of stroke have also increased and the cause is similar—blockage in the large arteries supplying the brain with blood.

https://www.westonaprice.org/health-topics/modern-diseases/what-causes-heart-disease/