Key result
Heart Sure A320 shows no nadir SpO2 difference vs Masimo Rad-5, unlike Nonin and BioBeat.
Why the study?
With an increasing number of portable pulse oximetry devices of varying designs and specifications, this study evaluated the accuracy of three portable devices against a reference standard during 6-minute walk tests.
Do portable oximetry devices accurately measure SpO2 compared to a reference standard during 6-minute walk tests in patients with cardiac or respiratory diseases?
Population
50 subjects across five cardiopulmonary disease and oxygen therapy target groups
Comparison
BioBeat wristwatch, Nonin WristOx 2 3150, and Heart Sure A320 vs Masimo Rad-5 reference standard
Design
Prospective study
Authors
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Heart Sure A320 agrees with reference nadir SpO2 in 6MWT; leaves open accuracy of other portables and clinical adoption.
Observational (n=50)
Do portable oximetry devices accurately measure SpO2 compared to a reference standard during 6-minute walk tests in patients with cardiac or respiratory diseases?
p-value: P=.18 (Heart Sure), P≤.001 (Nonin), P<.001 (BioBeat)
The Heart Sure A320 and Nonin Wrist-Ox 2 3150 portable oximeters provide comparable nadir SpO2 measurements to a reference standard during 6-minute walk tests, supporting their potential use for remote monitoring.
Marshall et al. (2025) conducted an observational in COPD, interstitial lung disease, pulmonary hypertension, oxygen therapy users, and other cardiac/respiratory diseases (n=50). BioBeat wristwatch, Nonin WristOx 2 3150, and Heart Sure A320 vs. Masimo Rad-5 was evaluated on Mean nadir SpO2 (p=P=.18 (Heart Sure), P≤.001 (Nonin), P<.001 (BioBeat)). The Heart Sure A320 portable oximeter showed no significant difference in nadir SpO2 compared to the Masimo Rad-5 reference (P=0.18), while the Nonin and BioBeat devices differed significantly.
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