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The new research suggests that skin color–related differences in pulse oximeter readings are in fact impacting clinical decision-making, lead author Eric R. Gottlieb, MD, of Brigham and Women’s Hospital and Massachusetts Institute of Technology, both in Boston, and colleagues wrote. This suggests that technology needs to updated to improve health equity, they continued, in their paper published in JAMA Internal Medicine.
“It has been known for decades that these readings are affected by various surface pigmentations, including nail polish and skin melanin, which may affect light absorption and scattering,” the investigators wrote. “This increases the risk of hidden hypoxemia [among patients with darker skin], in which patients have falsely elevated SpO2 readings, usually defined as 92% or greater, with a blood hemoglobin oxygen saturation less than 88%.”
Although published reports on this phenomenon date back to the 1980s, clinical significance has been largely discounted, they said, citing a 2008 paper on the topic, which stated that “oximetry need not have exact accuracy” to determine if a patient needs oxygen supplementation.
‘We’re not providing equal care’
Questioning the validity of this statement, Dr. Gottlieb and colleagues conducted a retrospective cohort study involving 3,069 patients admitted to intensive care at the Beth Israel Deaconess Medical Center in Boston between 2008 and 2019, thereby excluding patients treated during the COVID-19 pandemic. The population consisted of four races/ethnicities: White (87%), Black (7%), Hispanic (4%), and Asian (3%).
Aligning with previous studies, multivariable linear regression analyses showed that Asian, Black, and Hispanic patients had significantly higher SpO2 readings than White patients in relation to hemoglobin oxygen saturation values, suggesting falsely elevated readings.
Further modeling showed that these same patient groups also received lower oxygen delivery rates, which were not explained directly by race/ethnicity, but instead were mediated by the discrepancy between SpO2 and hemoglobin oxygen saturation values. In other words, physicians were responding consistently to pulse oximetry readings, rather than exhibiting a direct racial/ethnic bias in their clinical decision-making.
“We’re not providing equal care,” Dr. Gottlieb said in an interview. “It’s not that the patients are sicker, or have other socioeconomic explanations for why this happens to them. It’s us. It’s our technology. And that’s something that really has to be fixed.”
The investigators offered a cautionary view of corrective algorithms, as these “have exacerbated disparities and are subject to ethical concerns;” for example, with glomerular filtration rate estimations in Black patients.
Dr. Gottlieb also cautioned against action by individual physicians, who may now be inclined to change how they interpret pulse oximeter readings based on a patient’s race or ethnicity.
“I don’t think that we can expect physicians, every time they see a patient, to be second guessing whether the number basically reflects the truth,” he said.
Instead, Dr. Gottlieb suggested that the burden of change rests upon the shoulders of institutions, including hospitals and device manufacturers, both of which “really need to take the responsibility” for making sure that pulse oximeters are “equitable and have similar performance across races.”
While Dr. Gottlieb said that skin color likely plays the greatest role in measurement discrepancies, he encouraged stakeholders “to think broadly about this, and not just assume that it’s entirely skin color,” noting a small amount of evidence indicating that blood chemistry may also play a role. Still, he predicted that colorimetry – the direct measurement of skin color – will probably be incorporated into pulse oximeters of the future.
Black patients 3X more likely to have hidden hypoxia than White patients
Michael Sjoding, MD, of the University of Michigan, Ann Arbor, was one of the first to raise awareness of skin color–related issues with pulse oximeters during the throes of the COVID-19 pandemic. His study, which involved more than 10,000 patients, showed that Black patients were threefold more likely to have hidden hypoxia than White patients.
The present study shows that such discrepancies are indeed clinically significant, Dr. Sjoding said in an interview. And these data are needed, he added, to bring about change.
“What is being asked is potentially a big deal,” Dr. Sjoding said. “Pulse oximeters are everywhere, and it would be a big undertaking to redesign pulse oximeters and purchase new pulse oximeters. You need a compelling body of evidence to do that. I think it’s there now, clearly. So I’m hopeful that we’re going to finally move forward, towards having devices that we are confident work accurately in everyone.”
Why it has taken so long to gather this evidence, however, is a thornier topic, considering race-related discrepancies in pulse oximeter readings were first documented more than 3 decades ago.
“We sort of rediscovered something that had been known and had been described in the past,” Dr. Sjoding said. He explained how he and many of his colleagues had completed pulmonary fellowships, yet none of them knew of these potential issues with pulse oximeters until they began to observe differences in their own patients during the pandemic.
“I’ll give previous generations of researchers the benefit of the doubt,” Dr. Sjoding said, pointing out that techniques in data gathering and analysis have advanced considerably over the years. “The types of studies that were done before were very different than what we did.”
Yet Dr. Sjoding entertained the possibility that other factors may have been at play.
“I think definitely there’s a social commentary on prioritization of research,” he said.
The study was supported by grants from the National Institutes of Health. The investigators and Dr. Sjoding reported no conflicts of interest.
The new research suggests that skin color–related differences in pulse oximeter readings are in fact impacting clinical decision-making, lead author Eric R. Gottlieb, MD, of Brigham and Women’s Hospital and Massachusetts Institute of Technology, both in Boston, and colleagues wrote. This suggests that technology needs to updated to improve health equity, they continued, in their paper published in JAMA Internal Medicine.
“It has been known for decades that these readings are affected by various surface pigmentations, including nail polish and skin melanin, which may affect light absorption and scattering,” the investigators wrote. “This increases the risk of hidden hypoxemia [among patients with darker skin], in which patients have falsely elevated SpO2 readings, usually defined as 92% or greater, with a blood hemoglobin oxygen saturation less than 88%.”
Although published reports on this phenomenon date back to the 1980s, clinical significance has been largely discounted, they said, citing a 2008 paper on the topic, which stated that “oximetry need not have exact accuracy” to determine if a patient needs oxygen supplementation.
‘We’re not providing equal care’
Questioning the validity of this statement, Dr. Gottlieb and colleagues conducted a retrospective cohort study involving 3,069 patients admitted to intensive care at the Beth Israel Deaconess Medical Center in Boston between 2008 and 2019, thereby excluding patients treated during the COVID-19 pandemic. The population consisted of four races/ethnicities: White (87%), Black (7%), Hispanic (4%), and Asian (3%).
Aligning with previous studies, multivariable linear regression analyses showed that Asian, Black, and Hispanic patients had significantly higher SpO2 readings than White patients in relation to hemoglobin oxygen saturation values, suggesting falsely elevated readings.
Further modeling showed that these same patient groups also received lower oxygen delivery rates, which were not explained directly by race/ethnicity, but instead were mediated by the discrepancy between SpO2 and hemoglobin oxygen saturation values. In other words, physicians were responding consistently to pulse oximetry readings, rather than exhibiting a direct racial/ethnic bias in their clinical decision-making.
“We’re not providing equal care,” Dr. Gottlieb said in an interview. “It’s not that the patients are sicker, or have other socioeconomic explanations for why this happens to them. It’s us. It’s our technology. And that’s something that really has to be fixed.”
The investigators offered a cautionary view of corrective algorithms, as these “have exacerbated disparities and are subject to ethical concerns;” for example, with glomerular filtration rate estimations in Black patients.
Dr. Gottlieb also cautioned against action by individual physicians, who may now be inclined to change how they interpret pulse oximeter readings based on a patient’s race or ethnicity.
“I don’t think that we can expect physicians, every time they see a patient, to be second guessing whether the number basically reflects the truth,” he said.
Instead, Dr. Gottlieb suggested that the burden of change rests upon the shoulders of institutions, including hospitals and device manufacturers, both of which “really need to take the responsibility” for making sure that pulse oximeters are “equitable and have similar performance across races.”
While Dr. Gottlieb said that skin color likely plays the greatest role in measurement discrepancies, he encouraged stakeholders “to think broadly about this, and not just assume that it’s entirely skin color,” noting a small amount of evidence indicating that blood chemistry may also play a role. Still, he predicted that colorimetry – the direct measurement of skin color – will probably be incorporated into pulse oximeters of the future.
Black patients 3X more likely to have hidden hypoxia than White patients
Michael Sjoding, MD, of the University of Michigan, Ann Arbor, was one of the first to raise awareness of skin color–related issues with pulse oximeters during the throes of the COVID-19 pandemic. His study, which involved more than 10,000 patients, showed that Black patients were threefold more likely to have hidden hypoxia than White patients.
The present study shows that such discrepancies are indeed clinically significant, Dr. Sjoding said in an interview. And these data are needed, he added, to bring about change.
“What is being asked is potentially a big deal,” Dr. Sjoding said. “Pulse oximeters are everywhere, and it would be a big undertaking to redesign pulse oximeters and purchase new pulse oximeters. You need a compelling body of evidence to do that. I think it’s there now, clearly. So I’m hopeful that we’re going to finally move forward, towards having devices that we are confident work accurately in everyone.”
Why it has taken so long to gather this evidence, however, is a thornier topic, considering race-related discrepancies in pulse oximeter readings were first documented more than 3 decades ago.
“We sort of rediscovered something that had been known and had been described in the past,” Dr. Sjoding said. He explained how he and many of his colleagues had completed pulmonary fellowships, yet none of them knew of these potential issues with pulse oximeters until they began to observe differences in their own patients during the pandemic.
“I’ll give previous generations of researchers the benefit of the doubt,” Dr. Sjoding said, pointing out that techniques in data gathering and analysis have advanced considerably over the years. “The types of studies that were done before were very different than what we did.”
Yet Dr. Sjoding entertained the possibility that other factors may have been at play.
“I think definitely there’s a social commentary on prioritization of research,” he said.
The study was supported by grants from the National Institutes of Health. The investigators and Dr. Sjoding reported no conflicts of interest.
The new research suggests that skin color–related differences in pulse oximeter readings are in fact impacting clinical decision-making, lead author Eric R. Gottlieb, MD, of Brigham and Women’s Hospital and Massachusetts Institute of Technology, both in Boston, and colleagues wrote. This suggests that technology needs to updated to improve health equity, they continued, in their paper published in JAMA Internal Medicine.
“It has been known for decades that these readings are affected by various surface pigmentations, including nail polish and skin melanin, which may affect light absorption and scattering,” the investigators wrote. “This increases the risk of hidden hypoxemia [among patients with darker skin], in which patients have falsely elevated SpO2 readings, usually defined as 92% or greater, with a blood hemoglobin oxygen saturation less than 88%.”
Although published reports on this phenomenon date back to the 1980s, clinical significance has been largely discounted, they said, citing a 2008 paper on the topic, which stated that “oximetry need not have exact accuracy” to determine if a patient needs oxygen supplementation.
‘We’re not providing equal care’
Questioning the validity of this statement, Dr. Gottlieb and colleagues conducted a retrospective cohort study involving 3,069 patients admitted to intensive care at the Beth Israel Deaconess Medical Center in Boston between 2008 and 2019, thereby excluding patients treated during the COVID-19 pandemic. The population consisted of four races/ethnicities: White (87%), Black (7%), Hispanic (4%), and Asian (3%).
Aligning with previous studies, multivariable linear regression analyses showed that Asian, Black, and Hispanic patients had significantly higher SpO2 readings than White patients in relation to hemoglobin oxygen saturation values, suggesting falsely elevated readings.
Further modeling showed that these same patient groups also received lower oxygen delivery rates, which were not explained directly by race/ethnicity, but instead were mediated by the discrepancy between SpO2 and hemoglobin oxygen saturation values. In other words, physicians were responding consistently to pulse oximetry readings, rather than exhibiting a direct racial/ethnic bias in their clinical decision-making.
“We’re not providing equal care,” Dr. Gottlieb said in an interview. “It’s not that the patients are sicker, or have other socioeconomic explanations for why this happens to them. It’s us. It’s our technology. And that’s something that really has to be fixed.”
The investigators offered a cautionary view of corrective algorithms, as these “have exacerbated disparities and are subject to ethical concerns;” for example, with glomerular filtration rate estimations in Black patients.
Dr. Gottlieb also cautioned against action by individual physicians, who may now be inclined to change how they interpret pulse oximeter readings based on a patient’s race or ethnicity.
“I don’t think that we can expect physicians, every time they see a patient, to be second guessing whether the number basically reflects the truth,” he said.
Instead, Dr. Gottlieb suggested that the burden of change rests upon the shoulders of institutions, including hospitals and device manufacturers, both of which “really need to take the responsibility” for making sure that pulse oximeters are “equitable and have similar performance across races.”
While Dr. Gottlieb said that skin color likely plays the greatest role in measurement discrepancies, he encouraged stakeholders “to think broadly about this, and not just assume that it’s entirely skin color,” noting a small amount of evidence indicating that blood chemistry may also play a role. Still, he predicted that colorimetry – the direct measurement of skin color – will probably be incorporated into pulse oximeters of the future.
Black patients 3X more likely to have hidden hypoxia than White patients
Michael Sjoding, MD, of the University of Michigan, Ann Arbor, was one of the first to raise awareness of skin color–related issues with pulse oximeters during the throes of the COVID-19 pandemic. His study, which involved more than 10,000 patients, showed that Black patients were threefold more likely to have hidden hypoxia than White patients.
The present study shows that such discrepancies are indeed clinically significant, Dr. Sjoding said in an interview. And these data are needed, he added, to bring about change.
“What is being asked is potentially a big deal,” Dr. Sjoding said. “Pulse oximeters are everywhere, and it would be a big undertaking to redesign pulse oximeters and purchase new pulse oximeters. You need a compelling body of evidence to do that. I think it’s there now, clearly. So I’m hopeful that we’re going to finally move forward, towards having devices that we are confident work accurately in everyone.”
Why it has taken so long to gather this evidence, however, is a thornier topic, considering race-related discrepancies in pulse oximeter readings were first documented more than 3 decades ago.
“We sort of rediscovered something that had been known and had been described in the past,” Dr. Sjoding said. He explained how he and many of his colleagues had completed pulmonary fellowships, yet none of them knew of these potential issues with pulse oximeters until they began to observe differences in their own patients during the pandemic.
“I’ll give previous generations of researchers the benefit of the doubt,” Dr. Sjoding said, pointing out that techniques in data gathering and analysis have advanced considerably over the years. “The types of studies that were done before were very different than what we did.”
Yet Dr. Sjoding entertained the possibility that other factors may have been at play.
“I think definitely there’s a social commentary on prioritization of research,” he said.
The study was supported by grants from the National Institutes of Health. The investigators and Dr. Sjoding reported no conflicts of interest.
FROM JAMA INTERNAL MEDICINE