If you or a blood relative have had a problem related to anesthesia or surgery, please let your anesthesiologist know. A thorough medical history and physical exam is, of course the most important information your anesthesiologist can receive.
Points C and J on the diagram represent the troughs of this wave. The trough of a wave is the point on the medium that exhibits the maximum amount of negative or downward displacement from the rest position. The wave shown above can be described by a variety of properties. One such property is amplitude. The amplitude of a wave refers to the maximum amount of displacement of a particle on the medium from its rest position. In a sense, the amplitude is the distance from rest to crest. Similarly, the amplitude can be measured from the rest position to the trough position.
1 Oscillations of the sinusoidal wave form above and below an imaginary baseline, although baseline is indeterminable with a sinusoidal pattern.  Amplitude of oscillations of 5 to 15 bpm (rarely is the amplitude of oscillations >15 bpm). Baseline variability is minimal or absent.