Identification of pressure cuff conditions using frequency content of an oscillometric pressure signal
First Claim
1. A method for evaluating whether an oscillometric signal representative of pressure oscillations in the vasculature of a patient is associated with special conditions, said method comprising:
- obtaining, from a blood pressure cuff, an oscillometric signal at a location on an extremity of the patient;
determining, using a processor, a ratio using a value associated with a first frequency component of the oscillometric signal and a value associated with a second frequency component of the oscillometric signal;
comparing, using the processor, the ratio to a threshold value;
associating, using the processor, a first diagnostic class from a plurality of diagnostic classes with the oscillometric signal when a first outcome of the comparison to the threshold value results from said comparing the ratio to a threshold value;
associating, using the processor, a second diagnostic class from a plurality of diagnostic classes with the oscillometric signal when a second outcome of the comparison to the threshold value results from said comparing the ratio to a threshold value, wherein the first diagnostic class is characterized as the patient having a first severity of peripheral arterial disease and the second diagnostic class is characterized as the patient having a second severity of peripheral arterial disease;
selecting, using the processor, a characteristic ratio based on the diagnostic class associated with the oscillometric signal;
applying, using the processor, the characteristic ratio to a maximum amplitude of the oscillometric signal to determine an adjusted amplitude value of the oscillometric signal; and
correlating, using the processor, the adjusted amplitude value of the oscillometric signal to a pressure in the blood pressure cuff to determine an indicated blood pressure value for the patient.
1 Assignment
0 Petitions
Accused Products
Abstract
A method, system and computer program product are provided for evaluating whether an oscillometric signal representative of pressure oscillations in the vasculature of a patient is associated with special conditions that may lead to inadvertently identifying the signal as being indicative of peripheral arterial disease or non-analyzable. In one embodiment, the method includes obtaining an oscillometric signal at a location on an extremity of the patient, determining a ratio using a value associated with a first frequency component of the oscillometric signal and a value associated with a second frequency component of the oscillometric signal, comparing the ratio to a threshold value, associating a first diagnostic class with the oscillometric signal when a first outcome results from comparing the ratio to a threshold value, and associating a second diagnostic class with the oscillometric signal when a second outcome results from comparing the ratio to a threshold value.
79 Citations
11 Claims
-
1. A method for evaluating whether an oscillometric signal representative of pressure oscillations in the vasculature of a patient is associated with special conditions, said method comprising:
-
obtaining, from a blood pressure cuff, an oscillometric signal at a location on an extremity of the patient; determining, using a processor, a ratio using a value associated with a first frequency component of the oscillometric signal and a value associated with a second frequency component of the oscillometric signal; comparing, using the processor, the ratio to a threshold value; associating, using the processor, a first diagnostic class from a plurality of diagnostic classes with the oscillometric signal when a first outcome of the comparison to the threshold value results from said comparing the ratio to a threshold value; associating, using the processor, a second diagnostic class from a plurality of diagnostic classes with the oscillometric signal when a second outcome of the comparison to the threshold value results from said comparing the ratio to a threshold value, wherein the first diagnostic class is characterized as the patient having a first severity of peripheral arterial disease and the second diagnostic class is characterized as the patient having a second severity of peripheral arterial disease; selecting, using the processor, a characteristic ratio based on the diagnostic class associated with the oscillometric signal; applying, using the processor, the characteristic ratio to a maximum amplitude of the oscillometric signal to determine an adjusted amplitude value of the oscillometric signal; and correlating, using the processor, the adjusted amplitude value of the oscillometric signal to a pressure in the blood pressure cuff to determine an indicated blood pressure value for the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A system operable to evaluate whether an oscillometric signal representative of pressure oscillations in the vasculature of a patient is associated with special conditions, said system comprising:
-
a pressure applicator positionable at a location on an extremity of a patient, said pressure applicator being controllable to apply a pressure to occlude blood flow in a portion of the extremity and to reduce the pressure applied thereby to permit blood flow to return in the portion of the extremity; a processor in operative communication with said pressure applicator; a pressure transducer in operative communication with said pressure applicator to obtain an oscillometric signal from the extremity as pressure applied by the pressure applicator to the extremity is reduced, wherein said pressure transducer is in operative communication with said processor; and a special conditions evaluation module executable by said processor, said special conditions evaluation module being operable to; determine a ratio using a value associated with a first frequency component of the oscillometric signal and a value associated with a second frequency component of the oscillometric signal; compare the ratio to a threshold value; associate a first diagnostic class from a plurality of diagnostic classes with the oscillometric signal when a first outcome of the comparison to the threshold value results from comparing the ratio to a threshold value; associate a second diagnostic class from a plurality of diagnostic classes with the oscillometric signal when a second outcome of the comparison to the threshold value results from comparing the ratio to a threshold value, wherein the first diagnostic class is characterized as the patient having a first severity of peripheral arterial disease and the second diagnostic class is characterized as the patient having a second severity of peripheral arterial disease; select a characteristic ratio based on the diagnostic class associated with the oscillometric signal; apply the characteristic ratio to a maximum amplitude of the oscillometric signal to determine an adjusted amplitude value of the oscillometric signal; and correlate the adjusted amplitude value of the oscillometric signal to a pressure in the pressure applicator to determine an indicated blood pressure value for the patient.
-
-
11. A computer program product for evaluating whether an oscillometric signal representative of pressure oscillations in the vasculature of a patient is associated with special conditions, said computer program product comprising:
-
a non-transitory computer readable medium having computer readable program code embodied therein, the computer readable program code including; computer readable program code enabling a processor to obtain, from a blood pressure cuff, an oscillometric signal at a location on an extremity of the patient; computer readable program code enabling a processor to determine a ratio using a value associated with a first frequency component of the oscillometric signal and a value associated with a second frequency component of the oscillometric signal; computer readable program code enabling a processor to compare the ratio to a threshold value; computer readable program code enabling a processor to associate a first diagnostic class from a plurality of diagnostic classes with the oscillometric signal when a first outcome of the comparison to the threshold value results from comparing the ratio to a threshold value; computer readable program code enabling a processor to associate a second diagnostic class from a plurality of diagnostic classes with the oscillometric signal when a second outcome of the comparison to the threshold value results from comparing the ratio to a threshold value, wherein the first diagnostic class is characterized as the patient having a first severity of peripheral arterial disease and the second diagnostic class is characterized as the patient having a second severity of peripheral arterial disease; computer readable program code enabling a processor to select a characteristic ratio based on the diagnostic class associated with the oscillometric signal; computer readable program code enabling a processor to apply the characteristic ratio to a maximum amplitude of the oscillometric signal to determine an adjusted amplitude value of the oscillometric signal; and computer readable program code enabling a processor to correlate the adjusted amplitude value of the oscillometric signal to a pressure in the blood pressure cuff to determine an indicated blood pressure value for the patient.
-
Specification