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Accuracy and utility of a new reflectance pulse oximeter for fetal monitoring during labor.
J Clin Monit. 1997 Mar; 13(2):103-8.JC

Abstract

OBJECTIVE

To evaluate the accuracy of a new pulse oximeter in estimating the oxyhemoglobin (O2Hb) concentration in fetal arterial blood (SaO2) with either a high concentration of hemoglobin F (HbF) or a low concentration of O2Hb during labor.

PATIENTS AND METHODS

Fetal forehead arterial oxygenation was determined in 44 fetuses by reflectance pulse oximeter (SpO2) during labor and was compared with SaO2 determined immediately after birth. Because HbF has little or no known effect on pulse oximetry, but does affect the laboratory multiwavelength "CO-oximeter" type reading, the SaO2 was corrected by HbF concentration. SpO2 and SaO2 were simultaneously measured in five hypoxic adult volunteers achieved by inhaling 11% oxygen.

RESULTS

A gradual decline in HbF concentration was seen during weeks 37 to 40 of gestation. HbF concentration varied near term, ranging between 53 and 88% of the fetal hemoglobin concentration (mean +/- SD = 74.6 +/- 6.3%). This alteration produced a lower %O2Hb percent by 4% at the most. The corrected SaO2 in cord blood correlated with fetal SpO2 (y = 0.974, x -7.279, r = 0.90). In five adults, SpO2 reflected well SaO2 with a mean +/- SD of bias of -1.1 +/- 2.9%.

CONCLUSIONS

SpO2 determined by a new reflectance pulse oximeter at the end of labor correlated with an immediate post-natal cord arterial blood sample before the first breath, with a mean and SD of bias of 8.5 +/- 6.2%. Reflectance pulse oximetry is a useful tool for continuous noninvasive monitoring of the fetal oxygen status during labor.

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Authors+Show Affiliations

Izumi A
Department of Obstetrics and Gynecology, Jichi Medical School, Tochigi, Japan.
Minakami H
No affiliation info available
Sato I
No affiliation info available

MeSH

AdultFemaleFetal BloodFetal HemoglobinFetal MonitoringHumansHypoxiaInfant, NewbornLabor, ObstetricOximetryOxygenOxyhemoglobinsPregnancyReproducibility of Results

Pub Type(s)

Journal Article

Language

eng

PubMed ID

9112205

Citation

Izumi, A, et al. "Accuracy and Utility of a New Reflectance Pulse Oximeter for Fetal Monitoring During Labor." Journal of Clinical Monitoring, vol. 13, no. 2, 1997, pp. 103-8.
Izumi A, Minakami H, Sato I. Accuracy and utility of a new reflectance pulse oximeter for fetal monitoring during labor. J Clin Monit. 1997;13(2):103-8.
Izumi, A., Minakami, H., & Sato, I. (1997). Accuracy and utility of a new reflectance pulse oximeter for fetal monitoring during labor. Journal of Clinical Monitoring, 13(2), 103-8.
Izumi A, Minakami H, Sato I. Accuracy and Utility of a New Reflectance Pulse Oximeter for Fetal Monitoring During Labor. J Clin Monit. 1997;13(2):103-8. PubMed PMID: 9112205.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Accuracy and utility of a new reflectance pulse oximeter for fetal monitoring during labor. AU - Izumi,A, AU - Minakami,H, AU - Sato,I, PY - 1997/3/1/pubmed PY - 1997/3/1/medline PY - 1997/3/1/entrez SP - 103 EP - 8 JF - Journal of clinical monitoring JO - J Clin Monit VL - 13 IS - 2 N2 - OBJECTIVE: To evaluate the accuracy of a new pulse oximeter in estimating the oxyhemoglobin (O2Hb) concentration in fetal arterial blood (SaO2) with either a high concentration of hemoglobin F (HbF) or a low concentration of O2Hb during labor. PATIENTS AND METHODS: Fetal forehead arterial oxygenation was determined in 44 fetuses by reflectance pulse oximeter (SpO2) during labor and was compared with SaO2 determined immediately after birth. Because HbF has little or no known effect on pulse oximetry, but does affect the laboratory multiwavelength "CO-oximeter" type reading, the SaO2 was corrected by HbF concentration. SpO2 and SaO2 were simultaneously measured in five hypoxic adult volunteers achieved by inhaling 11% oxygen. RESULTS: A gradual decline in HbF concentration was seen during weeks 37 to 40 of gestation. HbF concentration varied near term, ranging between 53 and 88% of the fetal hemoglobin concentration (mean +/- SD = 74.6 +/- 6.3%). This alteration produced a lower %O2Hb percent by 4% at the most. The corrected SaO2 in cord blood correlated with fetal SpO2 (y = 0.974, x -7.279, r = 0.90). In five adults, SpO2 reflected well SaO2 with a mean +/- SD of bias of -1.1 +/- 2.9%. CONCLUSIONS: SpO2 determined by a new reflectance pulse oximeter at the end of labor correlated with an immediate post-natal cord arterial blood sample before the first breath, with a mean and SD of bias of 8.5 +/- 6.2%. Reflectance pulse oximetry is a useful tool for continuous noninvasive monitoring of the fetal oxygen status during labor. SN - 0748-1977 UR - https://www.unboundmedicine.com/medline/citation/9112205/Accuracy_and_utility_of_a_new_reflectance_pulse_oximeter_for_fetal_monitoring_during_labor_ L2 - http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=9112205.ui DB - PRIME DP - Unbound Medicine ER -