S & V Siu Associates, LLC

Jusson Koo

Stanley Chan Siu

Zachary Andrew Siu

A method and apparatus are disclosed for assessing a respiratory function from plethysmography data obtainable, for example, from a pulse oximeter. A pulsatile waveform obtained from pleth data is processed to obtain a second waveform extending over multiple respiratory cycles and representing respiration-related variations in a pulse-beat area defined by the pulsatile waveform. The second waveform is analyzed to obtain information indicative of respiratory distress. A respiratory index that provides a good indicator of respiratory distress may be computed based on a magnitude of respiratory peaks in the second waveform. Applications to asthma and sleep apnea are described.

Method and apparatus for assessing respiratory distress

A method and apparatus are disclosed for assessing a respiratory function from plethysmography data obtainable, for example, from a pulse oximeter. A pulsatile waveform obtained from pleth data is processed to obtain a second waveform extending over a over multiple respiratory cycles and representing respiration-related variations in a pulse-beat area defined by the pulsatile waveform. The second waveform is analyzed to obtain information indicative of respiratory distress. A respiratory index that provides a good indicator of respiratory distress may be computed based on a magnitude of respiratory peaks in the second waveform. Applications to asthma and sleep apnea are described.

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Milpitas, CA, United States of America

Jusson Koo