Comparison of the SenSmart™ and the INVOS™ neonatal cerebral near-infrared spectrometry devices.

OBJECTIVES

To determine the correlation and agreement between the SenSmart™ and the INVOS™ devices of neonatal cerebral regional oxygen saturation (CrSO) measurements using neonatal sensors. The secondary objective was to develop a regression model that predicts CrSO-INVOS values using CrSO-SenSmart indices and determine whether the values between the devices are interchangeable.

METHODS

A prospective, cross-sectional study was conducted in infants during the first 4 weeks of life. Simultaneous, bilateral CrSO was measured using the SenSmart™X100 (CrSO-SenSmart) or INVOS™ 5100C (CrSO-INVOS) device in each frontoparietal area for 2 h. Five-minute CrSO values were extracted for analysis.

RESULTS

Thirty infants were recruited with 720 pairwise measurements and 26 (84%) were evaluated in the first week of life. Mean gestational age of the preterm and term infants was [30.9 ± 2.8 ( = 14) and 38.8 ± 1.1 ( = 16)] weeks, respectively. Overall CrSO- was 77.08 ± 9.70% and 71.45 ± 12.74% for the SenSmart and INVOS, respectively ( < 0.001). The correlation coefficient () between the CrSO-SenSmart and INVOS was 0.20 ( < 0.001). The mean difference between the CrSO-SenSmart and INVOS was 5.63 ± 13.87% with -21.6% to 32.8% limits of agreement. The and mean difference was 0.39 ( < 0.001) and 8.87 ± 12.58% in preterm infants, and 0.06 ( = 0.27) and 2.79 ± 14.34 in term infants.

CONCLUSION

The CrSO-SenSmart tended to read higher than the CrSO-INVOS device. There was no correlation between the CrSO-SenSmart and the CrSO-INVOS in term infants and it was weak in preterms. Due to imprecise agreement, the CrSO-SenSmart values are not interchangeable with those of the CrSO-INVOS.