Methods and apparatus for measuring arterial compliance using combined
noninvasive arterial tonometry and cuff oscillometry. Some embodiments
include a calibration method using an oscillometric signal to calibrate
the pressures of tonometric signals in a contralateral arterial site. The
times at which two of the three oscillometric blood pressures (systolic
pressure, mean pressure, diastolic pressure) are acquired are identified
with times of un-calibrated tonometric pressure waveform. These blood
pressures are then used to calibrate the tonometric pressure waveform
along (optionally) with adjustments for head pressure. For example, a left
brachial arterial cuff oscillometric signal is acquired coincidentally
with an un-calibrated right radial arterial pressure tonometric signal.
The time points of mean arterial pressure and diastolic pressure are
determined from the oscillometric signal and identified with coinciding
time points on the tonometric signal to produce a calibration. All
pressures are then adjusted by the head pressure between the brachial and
radial sites.
