What's it called when weed gives you painful heart trills like a heart attack?

Is there a name for that? I was wondering because I don't like it, and some strains give it to me, while others don't.

I smoked a joint of an Artizen strain called Gelato Runtz, and it was way too strong for me. It periodically gave me these painful heart trills. I've never had a heart attack, but they're what I imagine a mini-heart attack would feel like.

I then smoked a joint of a different Artizen strain called Cheetah Piss. This one was much milder. It made me feel relaxed, and didn't give me these painful heart trills. If, for the rest of my life, I could avoid those heart trills that make me feel like I'm about to die, that would be great.

What are they called? And how do I find out how to avoid them in each strain without trial and error?