Why are you so sure?again there is no evidence for heart failure with these kind of drugs.
there is no incidences of heart failure even with oral anti androgens. they used proxilutamide in their trials at 200mg orally. so lets say you use 10mg topically of pyrilutamide, that is 1/20th of the dose and topically so probably less than a hundredth and additionally proxilutamide is much stronger itself. so you are many hundred times weaker in anti androgenic action than the pills they use and these do not cause heart failure at all. the amount that gets in your blood is minuscule. there is just one fake report using RU on the internet and everybody went after it
People notice chest pain with RU or Pyri. I had arrhythmias with finasteride. And with pyri I notice arrhythmias like those I noticed with finasteride.
I believe that with testosterone, the heart is stronger.
If you google anti-androgen treatment and heart disease, you will see many associated problems.