Ask HN: Coffee drinkers, did you have any heart problem associated to coffee?

In the last 4 years, I have had at least five times a problem where my heart had an irregular beat followed by a drop in blood pressure (not sure if because of a panic attack or a real heart problem).

I decided to look for a cardiologist, who asked me for several tests (doppler echocardiogram, electrocardiogram, exercise stress test, blood tests, holter test, etc.).

I'm still waiting for the holter test result, but all the others are within the normal range. Looking at what might have caused this, one thing I remember that happened in common in all these episodes was, perhaps, I took too much coffee (6+ cups).

I read that some people are more sensitive to coffee than others, so my question is: Does that make any sense? Has anyone else here had a similar experience?