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The top green line is one of typically 12 leads of an ECG, the thing they put stickers and wires on your chest for to check how your heart is doing it's thing electrically. Typically the space between the middle of the blip and the last little bump will look different and be raised/depressed depending on what artery is occluded during something like a heart attack, but there's a plethora of other rhythm/electrical disturbances it can pick up too. Blue is your oxygen saturation, a measurement of how well your blood is carrying oxygen. It's measured by a little clamp with a light in it that goes on your finger, and the line is your pulse that it picks up through that. The white is your respiratory rate and the line shows the waveform for when/how you're inhaling/exhaling. And bottom left in the red is your blood pressure. Mind you, this is a shitty explanation and I'm not a doctor, I'm just frequently hooked up to these kinds of patient monitors.
