I have a project about extracting features from a homemade ECG. I need the PQRST points from the signal of the heart beat. The ECG I'm using has 3 electrodes that attach to the chest.
The problem is I don't know where I should define the PQRST points because the result does not look much like an ECG. I want to try to create a program later that can find those points.
Here are the raw ECG traces data taken from 3 subjects that were alcohol-intoxicated (0.2 to 0.3 promille):
I'm guessing the red and orange points here. And I'm pretty sure the green points are accurate located:
Green points is easy to locate but the orange is a little harder and the red ones are really hard to pin point out. Those points can be used to define the length of different complexes, intervals and segments of PQRST.
Which points is safe to extract? Where exactly are those points located in the graph?
Is the data too inaccurate for finding abnormalities?
Is there any other useful feature, beside heart rate, I can extract from my graph?