Reflectance pulse oximetry in fetal lambs: Subcutaneous vessels and vasoconstriction affect its reliability

Nijland, Roel; Jongsma, H.W.; Verbruggen, Ineke M.; Nijhuis, Jan G.

doi:10.1007/bf00857643

Cited by 8 publications

(3 citation statements)

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“…The underestimation ranged from -1 6 to -28% in four fetal lambs, at an Sao2 range of 20-50% . 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.…”

Section: Tissue Compartmentmentioning

confidence: 73%

“…Placing the sensor with the LEDs over the artery did result in larger plethysmographic sig S24 [31]. A n underestimation was also observed, when the same sensor was placed with the photode tector above a subcutaneous vein on the fetal lamb head [32]. The underestimation ranged from -1 6 to -28% in four fetal lambs, at an Sao2 range of 20-50% .…”

Section: Tissue Compartmentmentioning

confidence: 87%

“…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. Administration of adrenaline resulted in a vasoconstriction, and in an over estimation of 6-37% in five fetal lambs, at an S a 0 2 range of 20-50% [32].…”

Section: Tissue Compartmentmentioning

confidence: 89%

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

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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: 73%

Section: Tissue Compartmentmentioning

confidence: 87%