How Tissue Optics Influences Reflectance Pulse Oximetry

Graaff, Reindert; Dassel, A. C. M.; Zijlstra, Wg; Mul, F.F.M. de; Aarnoudse, Jan G.

doi:10.1007/978-1-4613-0333-6_14

Cited by 20 publications

(19 citation statements)

References 16 publications

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“…After coagulation of the vein, the difference between the intravascular S ao2 and the S p 0 2 was abolished [32]. The underestimation is in contradic tion with the theoretical models [16,30] which pre dicted an overestimation as a result of increased blood volume. However, one must consider that in those models homogenous media of absorbers and scatters were used, which may not be applicable for the heterogeneity of in vivo tissue.…”

Section: Tissue Compartmentmentioning

confidence: 76%

“…The effect of blood volume fraction differences was studied with theoretical models [16,30] and in vitro models [25]. T he theoretical models predicted that the influence of blood volume is of minor importance for the accuracy of 660/9 4 0 nm reflectance pulse oxime try if the Sao2 > 70% [16,30].…”

Section: Tissue Compartmentmentioning

confidence: 99%

“…T he theoretical models predicted that the influence of blood volume is of minor importance for the accuracy of 660/9 4 0 nm reflectance pulse oxime try if the Sao2 > 70% [16,30]. However, at an S ao2 of 25% an overestimation of around 25% is predicted, when the blood volume was changed from 1 to 5% [16,30]. By changing the depth of the blood film in their in vitro model, D e Kock and Tarassenko found similar results for 660/950 transmission pulse oxime tiy using an in vitro model [25].…”

Section: Tissue Compartmentmentioning

confidence: 99%

“…Alternative approaches in sensor design must therefore be considered for intra partum use. One theoretical suggestion is using three photodetectors at different distances of the LEDs [30].…”

Section: New Developmentsmentioning

confidence: 99%

See 3 more Smart Citations

Accuracy of fetal pulse oximetry and pitfalls in measurements

Nijland¹,

Jongsma²,

Nijhuis³

et al. 1997

European Journal of Obstetrics & Gynecology and Reproductiv

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Pulse oximetry is a technique for estimating arterial oxygen saturation continuously and non-invasively. Reflectance pulse oximetry might become useful for monitoring the fetus during labour but it is much more susceptible to all kinds of physiological variations than the well-established transmission pulse oximetry for neonatal or adult monitoring. This review focuses on the accuracy of reflectance pulse oximetry. Results of human, animal, in vitro and theoretical models indicate that factors such as; blood volume fraction differences, haematocrit, and blood flow differences are major sources for inaccurate pulse oximetry readings in the fetal arterial oxygen saturation range of 10-80%. These factors cannot be overcome by systems using two wavelengths sensors with the 660/890 or 940 nm combination. Reported precision values (S.D. of difference between pulse oximeter and blood sample saturation) range between 2.5 and 12.9% for various 660 nm sensors. Most sensors were tested only once with a limited number of animals. A new 735/890 nm sensor (Nellcor Puritan Bennett) demonstrates a promising accuracy (precision around 5%) in two studies. Various other sensors have also been developed, but are not or scarcely evaluated. Without thorough establishment of the reliability of this technique, clinical fetal oxygen saturation data are still of limited value.

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Section: Tissue Compartmentmentioning

confidence: 76%

Section: Tissue Compartmentmentioning

confidence: 99%

Section: Tissue Compartmentmentioning

confidence: 99%

Section: New Developmentsmentioning

confidence: 99%

See 2 more Smart Citations

Accuracy of fetal pulse oximetry and pitfalls in measurements

Nijland¹,

Jongsma²,

Nijhuis³

et al. 1997

European Journal of Obstetrics & Gynecology and Reproductiv

View full text Add to dashboard Cite

show abstract

“…For R P O X similar experimental cali brations are performed [5,6]. In theoretical models in which the propagation of light is based on both absorp tion and scattering of light, the relation between SpÛ2 and the measured ratio of pulsatile red and infrared signals becomes complex [7,8]. In these models the SpOo is, for instance, also dependent on the tissue blood volume.…”

Section: Introductionmentioning

confidence: 99%