Screening method and system to estimate the severity of injury in critically ill patients
First Claim
1. A method of screening a patient comprising:
- estimating a heart rate variability (HRV) based on an EKG signal;
determining one or more adjustment factors, including at least one of heart rate, presence/absence of sedation, age, gender, or blood pressure;
calculating an HRV index based at least in part on the estimated HRV and the one or more adjustment factors; and
determining an aspect of a patient'"'"'s condition based on the calculated HRV index.
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Accused Products
Abstract
Estimated heart rate variability (HRV) may be used to determine a heart rate variability index. Based on a relationship between one or more variables and the HRV, a multiple regression analysis may be performed to reduce a confounding effect of the one or more variables on a relationship between the heart rate variability index and the one or more variables. This index may then be normalized from 0-100. A computer, or other suitable device, operatively connected to a field monitor capable of taking an EKG, may determine an HRV index, which can then be used to determine the likelihood of a variety of medical conditions. These conditions can include such things as the likelihood of an abnormality were a computed axial tomography scan to be performed, thus, in some cases, reducing or eliminating the need for performing such a scan.
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Citations
37 Claims
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1. A method of screening a patient comprising:
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estimating a heart rate variability (HRV) based on an EKG signal; determining one or more adjustment factors, including at least one of heart rate, presence/absence of sedation, age, gender, or blood pressure; calculating an HRV index based at least in part on the estimated HRV and the one or more adjustment factors; and determining an aspect of a patient'"'"'s condition based on the calculated HRV index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for screening a patient comprising:
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an input that receives an EKG signal; and a computer system that estimates a heart rate variability (HRV) based on the EKG signal, receives input related to at least one of heart rate, presence or absence of sedation, age, gender, systolic blood pressure or diastolic blood pressure, and calculates a heart rate variability index based at least in part on the estimated HRV and the received input. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method comprising:
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estimating a heart rate variability (HRV) based on an EKG signal; determining a heart rate based on the EKG signal; and calculating a heart rate variability index based at least on the estimated HRV and the determined heart rate. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A system comprising:
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an input which receives an EKG signal; and a computer system which estimates a heart rate variability (HRV) based on the EKG signal, determines a heart rate based on the EKG signal, and calculates a heart rate variability index based at least on the estimated HRV and the determined heart rate. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification