Medical microprocessor system and method for providing a ventilation indexed oximetry value
First Claim
1. A microprocessor system for an evaluation of a patient, the system comprising a processor programmed to:
- (a) receive a first input indicative of said patient'"'"'s measured timed ventilation;
(b) receive a second input indicate of said patient'"'"'s measured arterial oxygen saturation, said saturation corresponding to said timed ventilation;
(c) receive a third input of at least one of said patient'"'"'s height, weight, sex, and body surface area;
(d) calculate said patient'"'"'s normal predicted timed ventilation based at least on said third input; and
(e) determine a relationship between at least said measured arterial saturation, said measured timed ventilation and said predicted timed ventilation.
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Accused Products
Abstract
Pathologic relationship trending of an oxygen saturation time series relative to a corresponding ventilation time series is identified used a medical microprocessor system, and an increasing difference between the two time series is detected and displayed. That increasing difference is provided for evaluating a patient and for detecting early evidence of serious illness. A patient'"'"'s normal predicted time ventilation may also be calculated using one or more of the patient'"'"'s height, weight, sex, and body surface area. A relationship is determined between measured blood oxygen saturation, measured time ventilation, and predicted time ventilation. The microprocessor preferably determines the presence of an interval of steady state ventilation and measures the timed ventilation during that interval. The microprocessor also measures the oxygen saturation corresponding to that determined, steady state ventilation interval. The microprocessor then calculates a Ventilation Oximetry Index (VOI) of minute ventilation and oxygen saturation as measured by pulse oximetry. The VOI assists the medical clinician in judging the potential effect of the measured minute ventilation on the oxygen saturation value and in identifying when additional testing (such as an arterial blood gas) is indicated.
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Citations
37 Claims
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1. A microprocessor system for an evaluation of a patient, the system comprising a processor programmed to:
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(a) receive a first input indicative of said patient'"'"'s measured timed ventilation;
(b) receive a second input indicate of said patient'"'"'s measured arterial oxygen saturation, said saturation corresponding to said timed ventilation;
(c) receive a third input of at least one of said patient'"'"'s height, weight, sex, and body surface area;
(d) calculate said patient'"'"'s normal predicted timed ventilation based at least on said third input; and
(e) determine a relationship between at least said measured arterial saturation, said measured timed ventilation and said predicted timed ventilation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 19, 20, 21, 22, 23, 24)
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16. A patient monitor for evaluating a patient, the monitor having a display, the monitor comprising:
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(a) a device for measuring ventilation capable of producing a first output of timed ventilation;
(b) a pulse oximeter capable of producing a second output indicative of said patient'"'"'s arterial oxygen saturation;
(c) an input device capable of receiving an input of at least one of a patient'"'"'s body dimensions; and
(d) a processor programmed to;
(d1) determine the presence of an interval of steady state ventilation and the timed ventilation during said interval to generate a first output, (d2) measure oxygen saturation corresponding to said interval to generate a second output, (d3) calculate said patient'"'"'s predicted ventilation based on at least one of said body dimensions, and (d4) display at least said first output, said second output, and said predicted ventilation. - View Dependent Claims (17, 25, 26, 27, 28, 29, 30)
(d5) compare said first output and said predicted timed ventilation to render a third output, and (d6) display said third output.
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26. A patient monitor as in claim 16 wherein said processor is further programmed to:
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(d5) compare said first output, said predicted ventilation, and said second output to render a fourth output, (d6) display said fourth output.
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27. A patient monitor as in claim 16 wherein said first output is the average minute ventilation during said interval of steady state ventilation.
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28. A patient monitor as in claim 16 wherein said processor is further programmed to identify a second time interval for measuring said oxygen saturation, said second time interval corresponding with said time interval of steady state ventilation.
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29. A patient monitor as in claim 28 wherein said second output is the average arterial oxygen saturation measured during said second time interval, said first time interval and said second time interval corresponding such that said second output is the average oxygen saturation generated by the gas exchange of the patient during said interval of steady state ventilation.
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30. A patient monitor as in claim 29 wherein said time interval of steady state ventilation defines a first onset and said time interval for measuring said oxygen saturation defines a second onset, said first onset occurring before said second onset.
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31. A microprocessor system for evaluating a patient and for detecting early evidence of serious illness in said patient by the identification of pathologic relational trending of an oxygen saturation time series relative to a corresponding ventilation time series, the system comprising a processor programmed to:
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(a) receive a first input of a time series of measured ventilation values to derive a first output indicative of a first trend of timed ventilation, (b) receive a second input of time series of measured arterial oxygen saturation to derive an output indicative of a second trend of oxygen saturation, said first time series corresponding to said second time series, (c) compare said first trend and said second trend to identify a increasing difference between said first trend and said second trend; and
(d) output an indication of said increasing difference. - View Dependent Claims (32, 33)
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34. A patient monitor for evaluating a patient, the monitor having a display, the monitor comprising:
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(a) a device for measuring ventilation capable of producing a first output of timed ventilation;
(b) a pulse oximeter capable of producing a second output indicative of said patient'"'"'s arterial oxygen saturation;
(c) an input device capable of receiving an input of at least one of a patient'"'"'s body dimensions; and
(d) a processor programmed to;
(d1) determine the presence of an interval of steady state ventilation and the timed ventilation during said interval to generate a first output, (d2) measure oxygen saturation corresponding to said interval to generate a second output, and (d3) display at least said first output and said second output. - View Dependent Claims (35, 36, 37)
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Specification