| 摘要 |
Arterial blood pressure of a subject (10) is determined by detecting the EKG (12) and selecting a fiducial point thereof, preferably the R-wave. Apparatus, preferably a photoplethysmograph (14) is provided for monitoring blood volume versus time at a selected location on the subject's body such as a fingertip (16). A time difference between th e occurrence of the selected fiducial point on the EKG and a selected change in blood in volume at the selected body location is determined. This time difference depends on the arrival time of the pulse at the distal location in addition to the shape of the blood volume versus time curve. Heart rate is determined from the EKG. The arterial pressure is computed from pulse arrival time, volumetric wave shape and instantaneous heart rate for each pulse. Methods are disclosed for determining diastolic pressure, systolic and mean arterial pressure. In another aspect, artifact detection and rejection are enabled. The invention provides for a continuous measure of blood pressure in a non- invasive, cuffless manner.
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