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 chart is used by general automated blood pressure monitors that has no
obvious relationship with the blood pressures, one of the reasons automated blood pressure monitor is inaccurate on many users.
You can play the video to watch and listen to the playback of a piece of blood pressure measurement record. Please use
earphone to hear the low frequency (bass) Korotkoff sounds and identify the first and last beat