The left and right red lines mark the first and last beat pulse sounds (Korotkoff sounds) in the top chart, indicating the systolic and diastolic blood pressure respectively.
The oscillometric wave in the middle is used by automated blood pressure monitors that has no obvious
relationship with the blood pressures.
Play the video to watch and listen to the playback of the blood pressure measurement. Please use your
earphone to hear the low frequency (bass) Korotkoff sounds and identify the first and last beat pulses.