Automated CCHD screening and detection
First Claim
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1. A method of determining a likelihood of a critical congenital heart defect using a pulse oximeter, the method comprising:
- displaying, on a display of a pulse oximeter, instructions to a caregiver to position a noninvasive sensor at a first measurement site on a patient predetermined to be substantially indicative of a pre-ductal blood oxygenation level and not substantially indicative of a post-ductal blood oxygenation level, wherein the noninvasive sensor is configured to output signals responsive to attenuation of light at measurement sites on the patient to the pulse oximeter, wherein the first measurement site is on a first limb of the patient;
receiving the output signals indicative of the pre-ductal blood oxygenation level at the first measurement site;
displaying, on the display of the pulse oximeter, an indication to the caregiver of a success or failure of obtaining a measure of pre-ductal blood oxygenation level at the first measurement site;
displaying, on the display of the pulse oximeter, instructions to the caregiver to position the noninvasive sensor at a second measurement site on the patient predetermined to be substantially indicative of a post-ductal blood oxygenation level and not substantially indicative of a pre-ductal blood oxygenation level, wherein the second measurement site is on a second limb of the patient, and wherein the second limb of the patient is different from the first limb of the patient;
receiving the output signals indicative of the post-ductal blood oxygenation level at the second measurement site;
displaying, on the display of the pulse oximeter, an indication to the caregiver of a success or failure of obtaining a measure of post-ductal blood oxygenation level at the second measurement site;
processing, by one or more hardware processors of the pulse oximeter, the pre-ductal blood oxygenation level and the post-ductal oxygenation level to determine a likelihood that the patient has a critical congenital heart defect, wherein said processing comprises at least time-wise aligning of at least portions of the output signals indicative of the pre-ductal blood oxygenation level and the output signals indicative of the post-ductal blood oxygenation level; and
displaying, on the display of the pulse oximeter, an indication to the caregiver of the likelihood that the patient has the critical congenital heart defect.
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Abstract
Automated critical congenital heart defect (“CCHD”) screening systems and processes are described. A caregiver may be guided to use a single or dual sensor pulse oximeter to obtain pre- and post-ductal blood oxygenation measurements. A delta of the measurements indicates the possible existence or nonexistence of a CCHD. Errors in the measurements are reduced by a configurable measurement confidence threshold based on, for example, a perfusion index. Measurement data may be stored and retrieved from a remote data processing center for repeated screenings.
946 Citations
19 Claims
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1. A method of determining a likelihood of a critical congenital heart defect using a pulse oximeter, the method comprising:
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displaying, on a display of a pulse oximeter, instructions to a caregiver to position a noninvasive sensor at a first measurement site on a patient predetermined to be substantially indicative of a pre-ductal blood oxygenation level and not substantially indicative of a post-ductal blood oxygenation level, wherein the noninvasive sensor is configured to output signals responsive to attenuation of light at measurement sites on the patient to the pulse oximeter, wherein the first measurement site is on a first limb of the patient; receiving the output signals indicative of the pre-ductal blood oxygenation level at the first measurement site; displaying, on the display of the pulse oximeter, an indication to the caregiver of a success or failure of obtaining a measure of pre-ductal blood oxygenation level at the first measurement site; displaying, on the display of the pulse oximeter, instructions to the caregiver to position the noninvasive sensor at a second measurement site on the patient predetermined to be substantially indicative of a post-ductal blood oxygenation level and not substantially indicative of a pre-ductal blood oxygenation level, wherein the second measurement site is on a second limb of the patient, and wherein the second limb of the patient is different from the first limb of the patient; receiving the output signals indicative of the post-ductal blood oxygenation level at the second measurement site; displaying, on the display of the pulse oximeter, an indication to the caregiver of a success or failure of obtaining a measure of post-ductal blood oxygenation level at the second measurement site; processing, by one or more hardware processors of the pulse oximeter, the pre-ductal blood oxygenation level and the post-ductal oxygenation level to determine a likelihood that the patient has a critical congenital heart defect, wherein said processing comprises at least time-wise aligning of at least portions of the output signals indicative of the pre-ductal blood oxygenation level and the output signals indicative of the post-ductal blood oxygenation level; and displaying, on the display of the pulse oximeter, an indication to the caregiver of the likelihood that the patient has the critical congenital heart defect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A pulse oximetry based system configured to determine a likelihood of a critical congenital heart defect, the system comprising:
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a noninvasive sensor configured to output signals responsive to an attenuation of light at measurement sites on a patient; and a pulse oximeter in communication with the noninvasive sensor to drive light sources of said noninvasive sensor and to receive said output signals, said pulse oximeter including one or more hardware processors configured to; display, on a display of the pulse oximeter, instructions to a caregiver to position the noninvasive sensor at a first measurement site on a patient predetermined to be substantially indicative of a pre-ductal blood oxygenation level and not substantially indicative of a post-ductal blood oxygenation level; receive the output signals indicative of the pre-ductal blood oxygenation level at the first measurement site; display, on the display of the pulse oximeter, an indication to the caregiver of a success or failure of obtaining a measure of pre-ductal blood oxygenation level at the first measurement site; display, on the display of the pulse oximeter, instructions to the caregiver to position the noninvasive sensor at a second measurement site on the patient predetermined to be substantially indicative of a post-ductal blood oxygenation level and not substantially indicative of a pre-ductal blood oxygenation level, wherein the second measurement site is on a second limb of the patient, and wherein the second limb of the patient is different from the first limb of the patient; receive the output signals indicative of the post-ductal blood oxygenation level at the second measurement site; display, on the display of the pulse oximeter, an indication to the caregiver of a success or failure of obtaining a measure of post-ductal blood oxygenation level at the second measurement site; process, by the one or more hardware processors of the pulse oximeter, the pre-ductal blood oxygenation level and the post-ductal oxygenation level to determine a likelihood that the patient has a critical congenital heart defect wherein said processing comprises at least time-wise aligning of at least portions of the output signals indicative of the pre-ductal blood oxygenation level and the output signals indicative of the post-ductal blood oxygenation level; and display, on the display of the pulse oximeter, an indication to the caregiver of the likelihood that the patient has the critical congenital heart defect. - View Dependent Claims (19)
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Specification