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Analysis of the tcPO2 response to blood interruption in infants and adults
H Horio1, S Ohminato, T Hasegawa
1Laboratory of Medical Instruments and Systems, National Cardiovascular Center Research Institute, Osaka, Japan.
Insights
The blood interruption simulation (BIS) test reveals premature infants have physiological immaturity. Their skin oxygen consumption and recovery rates differ significantly from adults, varying with birth weight.
Area of Science:
- Neonatal physiology
- Respiratory medicine
- Dermatology
Background:
- Transcutaneous PO2 (tcPO2) monitoring is crucial for assessing tissue oxygenation.
- The blood interruption simulation (BIS) test assesses cutaneous oxygen consumption and recovery dynamics.
- Understanding these dynamics in infants, especially premature ones, is vital for clinical assessment.
Purpose of the Study:
- To compare the tcPO2 response during the BIS test in healthy adults and infants, including premature neonates.
- To investigate the relationship between birth weight and BIS test parameters in infants.
- To evaluate the BIS test's utility in identifying physiological immaturity in premature infants.
Main Methods:
- The BIS test was performed on 6 healthy adults and 28 infants (including premature).
- tcPO2 levels were recorded during controlled blood flow interruption and recovery.
- Parameters analyzed included time lags, linear decrease rate (cutaneous oxygen consumption), and exponential recovery time constant.
Main Results:
- Infants and adults showed similar BIS test response patterns: initial lag, linear decrease, recovery lag, and exponential recovery.
- Cutaneous oxygen consumption rate was independent of oxygen pressure but varied significantly with infant birth weight.
- Infants exhibited faster recovery (13s time constant) than adults, with recovery time increasing with birth weight. Infant time lags were shorter than adults' and varied by birth weight (<2kg vs. others).
Conclusions:
- The BIS test parameters indicate physiological immaturity in premature infants.
- Birth weight is a significant factor influencing cutaneous oxygen consumption and recovery dynamics in neonates.
- The BIS test provides valuable insights into the developmental status of skin oxygen metabolism in infants.
Abstract:
The transcutaneous PO2 (tcPO2) response to blood interruption (BIS test) was measured in 6 healthy adults and 28 infants, including premature infants. The response was similar in both infants and adults with a time lag at the beginning of blood interruption, a subsequent linear decrease, a time lag at the end of blood interruption, and an exponential recovery to the final steady state. The linear decrease of tcPO2 in the BIS test had a correlation coefficient of more than 0.98 in all subjects and indicated the cutaneous oxygen consumption rate independent of the oxygen pressure. There was a significant difference in oxygen consumption according to birth weight in the infants (< 2 kg, 2-3 kg, and > 3 kg). The recovery time constant for infants was 13 seconds which was about 1.4 times faster than that for adults, and it increased significantly along with a higher birth weight. The time lag at blood interruption was longer than that at blood recovery. The time lag for infants was significantly shorter than that for adults, and in infants there was a significant difference between the group with a birth weight < 2 kg and the others (p < 0.005). All of the parameters of the BIS test suggested the physiological immaturity of premature infants.