Comparison of transesophageal arterial blood oxygen saturation monitoring and finger pulse oximeter
- VernacularTitle:手术患者经食道监测血氧饱和度和指端脉搏血氧测定法的比较
- Author:
Zhaoqiong ZHU
;
Wei WEI
;
Jin LIU
- Publication Type:Journal Article
- Keywords:
Oximetry, Transoesophagus
- From:
Chinese Journal of Anesthesiology
1994;0(05):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the sensitivity and accuracy of monitoring oxygen saturation of arterial blood flowing through descending aorta with a probe placed in the lower segment of esophagus ( SeO2). Methods This study was approved by the ethics committee of our hospital and written consent was obtained. Forty-five ASA Ⅰ-Ⅲ patients (34 males, 11 females) aged 14-79, weighing 40-90 kg undergoing elective (36 patients) or emergency (9 patients) surgery were studied. After induction of anesthesia a probe we made (patent number ZL 200320115080.2) was placed in the lower segment of esophagus and connected to a monitor (Philips-150A) . The depth of insertion and the direction of the probe were adjusted until the same waveform as SpO2 was obtained. Once the best waveform was obtained, 10-15 min stabilization was allowed. The ventilator was then disconnected. When SeO, decreased from 100% to 90% mechanical ventilation was started again. The following parameters were recorded:(1) the onset time (the time from disconnection of ventilator to the time when SeO2 and SpO2 started to decrease), (2) the time needed for SeO2 and SpO2 to decrease from 100% to 95% (T95) and 90% (T90), and (3) the recovery time (the time needed for SeO2 and SpDO2 to return to 100% after mechanical ventilation was started again. Arterial blood samples were taken for blood gas analysis when Se02 and SpO2 were 90% , 95% and 100% . Results SeO2 , SpO, and SaO2 were 100% when the patients were being ventilated with 100% oxygen. When the ventilator was disconnected SeO, dropped much faster than SpO2. It took (286?15)s for SeO2 to drop from 100% to 95% while for SpO2 it took (398 ?28)s. The most readings of SeO2 were in the range of 2 standard deviation from SaO2. SeO2 correlated well with SaO2 and SpO2. r was 0.9754 and 0.9656 respectively(P
