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Colour oscillations in arterioarterial anastomoses reflect natural differences in donor and recipient oxygenation and hematocrit
- Source :
- Placenta, 27(11-12), 1055-1059. W B SAUNDERS CO LTD, Placenta, 27(11-12), 1055-1059. W.B. Saunders Ltd
- Publication Year :
- 2006
-
Abstract
- Our aim was to show that the colour difference between brighter and darker red, occasionally observed as an oscillating boundary in the recipient and donor parts of an arterioarterial anastomosis in severe twin-twin transfusion syndrome (TTTS), is a consequence of natural differences in blood oxygenation and hematocrit developing between donor and recipient twins. As method we defined a theoretical model of the placenta with dimensions from pathology examination. From literature we determined the optical absorption and scattering properties of all tissue components, and hematocrit and oxygen saturation values for donor and recipient twins. From our placental model we simulated the spectrum of back-scattered light by standard Monte Carlo photon propagation computations and calculated the colour of chorionic arterial and venous blood vessels by applying the physics theory of colour perception. Our computations demonstrate that recipient arterial blood is somewhat brighter red than donor arterial blood. The strong colour differences seen after laser coagulation of all anastomoses but the arterioarterial were explained from an angiotensin II cut-off in the recipient due to obliteration of arteriovenous anastomoses, causing a temporary increase in recipient placental perfusion and hence in blood oxygenation. In conclusion, natural differences in recipient versus donor blood oxygen saturation and hematocrit in severe TTTS explain the observed colour differences between brighter and darker red observed in the recipient and donor parts of arterioarterial anastomoses. (c) 2005 Elsevier Ltd. All rights reserved.
- Subjects :
- genetic structures
Placenta
Color
Hematocrit
Anastomosis
Models, Biological
Monte Carlo simulations
Arterio-Arterial Fistula
Pregnancy
FETAL BLOOD
medicine
ABSORPTION
Humans
model of the placenta
Oxygen saturation (medicine)
medicine.diagnostic_test
Obstetrics and Gynecology
TWIN TRANSFUSION SYNDROME
Venous blood
Oxygenation
Anatomy
Fetofetal Transfusion
red colour oscillations
Angiotensin II
Oxygen
arterioarterial anastomoses
Reproductive Medicine
colour perception theory
Arterial blood
Female
ARTERIO-ARTERIAL ANASTOMOSES
LASER
Perfusion
Monte Carlo Method
Color Perception
Developmental Biology
twin-twin transfusion syndrome
Subjects
Details
- Language :
- English
- ISSN :
- 01434004
- Volume :
- 27
- Issue :
- 11-12
- Database :
- OpenAIRE
- Journal :
- Placenta
- Accession number :
- edsair.doi.dedup.....8c31a16ba86ae475031a23f39f043185