Nasal capnographic pressure monitoring system
First Claim
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1. A nasal capnographic pressure monitoring system comprising:
- a nasal cannula having at least one lumen;
a capnometer for measuring carbon dioxide within the nasal cannula and for generating a time series of carbon dioxide exhaled through the nose of the patient;
a pressure transducer mounted in communication with the capnometer for detecting pressure within at least one lumen of the nasal cannula; and
a processor for outputting a time series of the nasal pressure in combination with the time series of carbon dioxide, the processor programmed to;
compare the output of at least one component of the time series of the nasal pressure to the output of at least one component of the time series of carbon dioxide;
compare the output of at least one inspiratory component of the time series of the nasal pressure to the output of at least one expiratory component of the time series of carbon dioxide; and
detect an increase in inspiratory negative pressure associated with an increase in end expiratory carbon dioxide and to output a warning in response to the detection.
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Abstract
The disclosed embodiments relate to a system and method for detecting a response of a patient to an external stimulus. An exemplary method comprises the acts of generating at least one time series of at least one physiologic parameter, detecting the external stimulus, detecting at least one response associated with the stimulus, the response comprising at least one of a pattern and a value, and outputting an indication of the response.
656 Citations
15 Claims
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1. A nasal capnographic pressure monitoring system comprising:
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a nasal cannula having at least one lumen; a capnometer for measuring carbon dioxide within the nasal cannula and for generating a time series of carbon dioxide exhaled through the nose of the patient; a pressure transducer mounted in communication with the capnometer for detecting pressure within at least one lumen of the nasal cannula; and a processor for outputting a time series of the nasal pressure in combination with the time series of carbon dioxide, the processor programmed to; compare the output of at least one component of the time series of the nasal pressure to the output of at least one component of the time series of carbon dioxide; compare the output of at least one inspiratory component of the time series of the nasal pressure to the output of at least one expiratory component of the time series of carbon dioxide; and detect an increase in inspiratory negative pressure associated with an increase in end expiratory carbon dioxide and to output a warning in response to the detection. - View Dependent Claims (4, 5, 6, 7)
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2. A nasal capnographic pressure monitoring system comprising:
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a nasal cannula having at least one lumen; a capnometer for measuring carbon dioxide within the nasal cannula and for generating a time series of carbon dioxide exhaled through the nose of the patient; a pressure transducer mounted in communication with the capnometer for detecting pressure within at least one lumen of the nasal cannula; and a processor for outputting a time series of the nasal pressure in combination with the time series of carbon dioxide, the processor programmed to; compare the output of at least one component of the time series of the nasal pressure to the output of at least one component of the time series of carbon dioxide; compare the output of at least one inspiratory component of the time series of the nasal pressure to the output of at least one expiratory component of the time series of carbon dioxide; and detect a fall in amplitude of tidal nasal pressure coupled with a rise in amplitude of a tidal carbon dioxide value and to output a warning in response to the detection. - View Dependent Claims (8, 9, 10, 11)
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3. A nasal capnographic pressure monitoring system comprising:
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a nasal cannula having at least one lumen; a capnometer for measuring carbon dioxide within the nasal cannula and for generating a time series of carbon dioxide exhaled through the nose of the patient; a pressure transducer mounted in communication with the capnometer for detecting pressure within at least one lumen of the nasal cannula; and a processor for outputting a time series of the nasal pressure in combination with the time series of carbon dioxide, the processor programmed to; compare the output of at least one component of the time series of the nasal pressure to the output of at least one component of the time series of carbon dioxide; compare the output of at least one inspiratory component of the time series of the nasal pressure to the output of at least one expiratory component of the time series of carbon dioxide; and detect a fall in amplitude of tidal nasal pressure coupled with a rise in amplitude of a tidal carbon dioxide value and to output a warning in response to the detection, wherein the warning comprises an indication of reduced ventilation drive or obstructive hypoventilation. - View Dependent Claims (12, 13, 14, 15)
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Specification