Methods of impedance cardiography and heartbeat determination

A - Human Necessities – 61 – B

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

A61B 5/0295 (2006.01) A61B 5/04 (2006.01) A61B 5/0402 (2006.01) A61B 5/053 (2006.01)

Patent

CA 2118930

Thoracic impedance (22, 23) and EKG signals (25a, 25b) are processed for improved resolution and accuracy. EKG signals are adaptively processed (26, 28) by digitizing, filtering, differentiating and raising the resultant differential by a power greater than one to emphasize changes in the slope. Blocks of the processed EKG data are analyzed (30) to identify peak amplitude and to compare spacing between peak amplitudes to more accurately identify R wave peaks. Stroke volume is determined from a thoracic impedance signal and its time derivative. Preferably, a time- frequency distribution is taken of the time derivative thoracic impedance signal after low- and high-pass filtering to identify B and X wave events which are used to determine ventricular ejection time and dZ/dt min for heart stroke volume determination by conventional methods. Alternatively, stroke volume is determined by a new relationship between a product of a pair of impedances simultaneously sensed on opposing sides of a heart at the heartbeat's peak.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Methods of impedance cardiography and heartbeat determination does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods of impedance cardiography and heartbeat determination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods of impedance cardiography and heartbeat determination will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1819559

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.