Evaluation of a Novel Optical Smartphone Blood Pressure Application

A Method Comparison Study Against Invasive Arterial Blood Pressure Monitoring in Intensive Care Unit Patients

Olivier Desebbe; Chbabou Anas; Brenton Alexander; Karim Kouz; Jean-Francois Knebel; Patrick Schoettker; Jacques Creteur; Jean-Louis Vincent; Alexandre Joosten

Disclosures

BMC Anesthesiol. 2022;22(259) 

In This Article

Results

Thirty patients were enrolled in the study. Among them, the OptiBP™ was able to capture at least one reliable BP value per measurement time point in 22 patients (73%) which were used for statistical analysis (8 patients (27% of the study collective) had inadequate OptiBP™ signals). Patient characteristics are shown in Table 1.

The bias ± SD, 95% limits of agreement between both methods were 0.9 mmHg (± 7 mmHg; -13 to + 15 mmHg) for MAP, 0.2 mmHg (± 14 mmHg; -26 to + 27 mmHg) for SAP, and 1.1 mmHg (± 6 mmHg; -11 to + 13 mmHg) for DAP (Figures 2,3 and 4).

Figure 2.

Bland–Altman plots showing the agreement between the smartphone application for mean arterial pressure (MAP) measurements and the reference method (upper arm oscillometry)

Figure 3.

Bland–Altman plots showing the agreement between the smartphone application for systolic blood pressure (SAP) measurements and the reference method (upper arm oscillometry)

Figure 4.

Bland–Altman plots showing the agreement between the smartphone application for diastolic blood pressure (DAP) measurements and the reference method (upper arm oscillometry)

The proportions of measurement pairs in risk zones A to E were 88.8% (no risk), 10% (low risk), 1% (moderate risk), 0% (significant risk), and 0% (dangerous risk) for MAP and 88.4%, 8.6%, 3%, 0%, 0%, respectively, for SAP (Figure 5).

Figure 5.

Error grid analysis comparing systolic (left panel) and mean (right panel) arterial blood pressure measurements from the smartphone application with those from the radial artery catheter (reference method). The background colors correspond to the continuous risk level for each pair of measurements. The continuous risk level ranges from 0 to 100% as shown at the bottom of the figure

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