> resting heart rate being in the 113-120 bpm
That seems insanely high
That seems insanely high
If you're worried about an elevated resting heart rate, go get an ECG done. Don't let random people on the internet talk you into health anxiety.
So for someone who is say 30, your maximum rate is ~187. But a rate over 90 when resting is considered outside normal levels.
If you have no history of cardiac disease and aren't taking any medications that would cause an increased rate, if your resting rate is 113-120, you need to be checked.
edit: just checked again and nope, that was pre-doctor visit. Something that high would certainly cause me to worry.
During a-fib, the electrical impulses are all off. The peaks and valleys are irregularly spaced and the amplitudes vary from cycle to cycle. This usually results in a rapid heart rate as a second order effect because, due to the "misfiring" not enough blood is pumping through and your heart is working harder to make up for the difference.