What does the medical term appreciated mean?

When used in medical terminology, such as when a doctor is examining a patient, "not appreciated" means that they could not find or locate something.

If a doctor were to say "pedal pulse on left foot was not appreciated", that would mean that the doctor could not locate, feel, or hear the pulse on the left foot.

That does not mean it is not there, but simply that the doctor him or herself could not locate it.