From the article:
The study analyzed a large database of electronic medical records of patients enrolled in primary care practices in the United Kingdom and formed a cohort of 15,401 men, aged 45 years or older, with low testosterone levels (hypogonadism). Users of TRT [testosterone replacement therapy] had a 21 percent greater risk of cardiovascular events compared with nonusers, corresponding to an additional 128 events. The increased risk appears to be transient, declining after two years of TRT use, which the investigators attribute to a phenomenon called “depletion of susceptibles.”
“Our findings show that the use of TRT was associated with an increased risk of stroke, TIAs [transient ischaemic attack], or cardiac arrest during the first two years of use,” noted Christel Renoux