Table 1 Summary of optical absorption and scattering properties at baseline, end-of-asphyxia and 10-min of CPR.
Baseline n = 48 | Asphyxia, End (Δ Baseline) | p value† | CPR, 10 min (Δ Baseline) | |||
|---|---|---|---|---|---|---|
ROSC n = 37 | No-ROSC n = 11 | p value‡ | ||||
Optical absorption coefficient µa (λ), (1/cm) | ||||||
µa (690 nm) | 0.16 [0.14, 0.19] | + 0.07 [0.05, 0.09] | < 0.001 | + 0.05 [0.03, 0.06] | + 0.03 [0.02, 0.05] | 0.294 |
µa (725 nm) | 0.14 [0.12, 0.15] | + 0.04 [0.03, 0.05] | < 0.001 | + 0.03 [0.02, 0.04] | + 0.02 [0.00, 0.03] | 0.105 |
µa (785 nm) | 0.14 [0.13, 0.15] | + 0.02 [0.01, 0.03] | < 0.001 | + 0.01 [0.01, 0.02] | − 0.02 [− 0.02, 0.00] | 0.011 |
µa (830 nm) | 0.15 [0.13, 0.16] | + 0.00 [− 0.01, 0.00] | 0.061 | + 0.00 [− 0.00, 0.01] | − 0.01 [− 0.04, − 0.00] | 0.001 |
Optical reduced scattering coefficient µs′ (λ), (1/cm) | ||||||
µs′ (690 nm) | 10.9 [9.9, 11.8] | + 0.0 [− 0.4, 0.4] | 0.759 | − 0.0 [− 0.6, 0.4] | + 0.3 [− 0.4, 0.6] | 0.233 |
µs′ (725 nm) | 10.2 [9.2, 10.9] | + 0.1 [− 0.2, 0.2] | 0.320 | − 0.2 [− 0.5, 0.4] | + 0.1 [− 0.2, 0.4] | 0.204 |
µs′ (785 nm) | 9.3 [8.3, 10.2] | + 0.1 [− 0.1, 0.5] | 0.024 | − 0.1 [− 0.4, 0.1] | + 0.5 [0.3, 0.9] | 0.005 |
µs′ (830 nm) | 8.7 [7.9, 9.4] | + 0.0 [− 0.1, 0.2] | 0.339 | − 0.2 [− 0.5, 0.2] | + 0.1 [0.0, 0.4] | 0.077 |
Mie scattering model fit parameters, µs′(λ) = a*(λ/500 nm)^b | ||||||
a, (1/cm) | 15.4 [12.1, 18.8] | + 0.2 [− 1.3, 1.5] | 0.604 | − 0.44 [− 1.89, 1.47] | + 0.59 [− 1.23, 1.63] | 0.691 |
b | 1.1 [0.7, 1.6] | + 0.0 [− 0.2, 0.2] | 0.837 | + 0.04 [− 0.24, 0.30] | − 0.02 [− 0.20, 0.16] | 0.691 |
Goodness-of-fit (adjusted R2) | 0.82 [0.54, 0.94] | − 0.02 [− 0.10, 0.05] | 0.142 | − 0.03 [− 0.22, 0.05] | + 0.08 [0.01, 0.17] | 0.026 |
