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probably abnormal ECG?
A low voltage EKG means the amplitude of the QRS waves on the EKG are lower than would be expected. COPD, obesity, and pericardial effusions can cause low EKG voltages, amongst other causes.
diastolic pressure
Has more energy than a wave with low amplitude.
Low frequency = low pitch = long waves
High frequency and low amplitude.
An ECG won't show oxygen levels in the blood - it simply records the patients heartbeat.
They're not. The same amplitude can have high or low frequency, and the same frequency can have large or small amplitude.
low amplitude
a rectifier and low pass filter
Yes, but I don't remember how.
Yes. There's no connection between frequency and amplitude.