Patent ID: 8343057
Filing Date: 2013-01-01
Classification: A61B

Abstract:
1. A non-invasive cardiac monitoring system comprising: a photoemitter adapted to transmit light through a portion of a patient's extra-thoracic arterial circulation; a photodetector adapted to receive light after having been transmitted through such a patient and for outputting a first signal based on the received light; and processing electronics configured to produce a cardiac pressure signal as a measure of such a patient's cardiac function by: wherein the filter is dynamically adjusted by (1) setting a cutoff frequency fcutoff as fHR−fsmear responsive to the respiratory rate frequency component fRR being less than the heart rate frequency component fHR, and (2) setting the cutoff frequency fcutoff as fHR+fsmear responsive to the respiratory rate frequency component fRR being greater than the heart rate frequency component fHR, where fsmear is a predetermined threshold frequency.