Methods of monitoring oxygenation by positive end expiratory pressure using photoplethysmography
First Claim
1. A method of optimizing oxygenation in a patient comprising:
- (a) securing a photoplethysmography (PPG) sensor and a positive end expiratory pressure (PEEP) apparatus to a central source site of the patient,(b) applying PEEP to the patient at a first level;
(c) evaluating with a computer (1) a blood oxygen saturation; and
(2) changes in a magnitude of an envelope of a PPG signal and/or an amplitude of a PPG signal, to determine whether the level of PEEP is appropriate; and
(d) if the level of PEEP is not appropriate, (1) increasing or decreasing the level of PEEP to a second level, (2) increasing fluid volume in the patient, (3) providing drug treatment to the patient, or (4) a combination thereof.
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Accused Products
Abstract
The present invention relates to novel lip/cheek probes for detection of pulse-based differences in light absorbence across the vascularized tissue of a lip or cheek of a patient. These probes are fabricated to provide signals to estimate arterial oxygen saturation, and/or to obtain other photoplethysmographic data. The present invention also relates to a combined probe/cannula. The present invention also relates to other devices that combine a pulse oximeter probe with a device supplying oxygen or other oxygen-containing gas to a person in need thereof, and to sampling means for exhaled carbon dioxide in combination with the novel lip/cheek probes. In certain embodiments, an additional limitation of a control means to adjust the flow rate of such gas is provided, where such control is directed by the blood oxygen saturation data obtained from the pulse oximeter probe.
50 Citations
20 Claims
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1. A method of optimizing oxygenation in a patient comprising:
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(a) securing a photoplethysmography (PPG) sensor and a positive end expiratory pressure (PEEP) apparatus to a central source site of the patient, (b) applying PEEP to the patient at a first level; (c) evaluating with a computer (1) a blood oxygen saturation; and
(2) changes in a magnitude of an envelope of a PPG signal and/or an amplitude of a PPG signal, to determine whether the level of PEEP is appropriate; and(d) if the level of PEEP is not appropriate, (1) increasing or decreasing the level of PEEP to a second level, (2) increasing fluid volume in the patient, (3) providing drug treatment to the patient, or (4) a combination thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of optimizing positive end expiratory pressure (PEEP) in a patient comprising
evaluating with a computer (1) a blood oxygen saturation of the patient; - and (2) changes in a magnitude of an envelope of a PPG signal obtained at a central source site of the patient and/or a magnitude of an amplitude of a PPG signal obtained at a central source site of the patient, to determine whether the level of PEEP is appropriate; and
if the level of PEEP is not appropriate, (1) increasing or decreasing the level of PEEP, (2) increasing fluid volume in the patient, (3) providing drug treatment to the patient, or (4) a combination thereof. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
- and (2) changes in a magnitude of an envelope of a PPG signal obtained at a central source site of the patient and/or a magnitude of an amplitude of a PPG signal obtained at a central source site of the patient, to determine whether the level of PEEP is appropriate; and
Specification