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The Oxygen Saturation (SO2) and Breath-Holding Time Variation Applied Active Breathing Control (ABC)

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G Gong

G Gong1*, Y Yin2 , (1) ,,,(2) Shandong Cancer Hospital, Jinan, Shandong


SU-E-T-326 Sunday 3:00PM - 6:00PM Room: Exhibit Hall


To study the oxygen saturation (SOâ‚‚) and breath-holding time variation applied active breathing control (ABC) in radiotherapy of tumor.
24 volunteers were involved in our trials, and they all did breath-holding motion assisted by ELEKTA Active Breathing Coordinator 2.0 for 10 times respectively. And the patient monitor was used to observe the oxygen saturation (SOâ‚‚) variation. The variation of SOâ‚‚, and length of breath-holding time and the time for recovering to the initial value of SO2 were recorded and analyzed.
(1)The volunteers were divided into two groups according to the SOâ‚‚ variation in breath-holding: A group, 14 cases whose SOâ‚‚ reduction were more than 2% (initial value was 97% to 99%, while termination value was 91% to 96%); B group, 10 cases were less than 2% in breath-holding without inhaling oxygen.(2) The interfraction breath holding time varied from 8 to 20s for A group compared to the first breath-holding time, and for B group varied from 4 to 14s.
(3) The breathing holding time of B group prolonged mean 8s, compared to A group.
(4)The time for restoring to the initial value of SOâ‚‚ was from 10s to 30s. And the breath-holding time shortened obviously for patients whose SO2 did not recover to normal.
It is very obvious that the SOâ‚‚ reduction in breath-holding associated with ABC for partial people. It is necessary to check the SOâ‚‚ variation in breath training, and enough time should be given to recover SOâ‚‚.

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