ABSTRACT
Near-infrared spectroscopy (NIRS) has been used as a noninvasive method for monitoring
the real-time oxygenation status in areas such as the brain and striated muscle. Because
the oxygenation status of the placenta is closely related to the fetal condition,
monitoring placental oxygenation through the maternal abdomen is desirable. We performed
transabdominal monitoring of oxygenation of the placenta by NIRS in 11 women. We improved
the conventional probe of the NIRO 300 system (Hamamatsu Photonics KK, Hamamatsu,
Japan) to obtain placental oxygenation data. With this probe, we succeeded in obtaining
oxyhemoglobin and deoxyhemoglobin data through the maternal abdomen. We believe NIRS
will prove to be useful for intrapartum monitoring.
KEYWORDS
Oxygenation - placenta - near-infrared spectroscopy (NIRS) - transabdominal monitoring
- oxyhemoglobin (HbO2) - deoxyhemoglobin (HHb)
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Jun KakogawaM.D.
Department of Obstetrics and Gynecology, Hamamatsu University School of Medicine
Handayama 1-20-1, Hamamatsu Shizuoka 431-3192, Japan
Email: kakogawa@hama-med.ac.jp