Non Invasive Oxygen Extraction Index (OEI) Measurement via Pulse Co-Oximetry in Pediatric Patients
Patient demographics (age, height and weight) will be collected for 100 consecutive patients presenting for surgical procedures which would require intubation.
a pulse oximeter sensor (Pulse Co-oximeterTM sensor (Masimo, irvine Ca) will be placed on the subject prior to induction of anesthesia and connected to the Masimo Radical-7 (Masimo, irvine Ca). The monitor will then be connected to a laptop. oxygen saturation and the oei will be recorded continuously on automated data collection software from the time of the placement of the sensor up to 5 minutes after intubation is complete. oxygen will be administered according to the general anesthesia airway management sequence detailed below.
Randomization and airway Management
The laryngoscopy and intubations will be performed as standard of care by the study investigators who are faculty anesthesiologists or by the mid-level/mid-level trainee or fellow/resident working with them. When SPo2 reaches 92%, the patient will be reconnected to the anesthesia circuit and ventilated with 100% o2 through either the eTT or LMa.
General anesthesia x airway management sequence:
* Mask induction with spontaneous ventilation
oBaseline Spo2 recording on room air for one minute)
o3-4 minutes recording at 100% oxygen and sevofluorane via face mask
* intravenous cannula placement
* The rest of the anesthetic management will be at the discretion of the investigator and dependent on the depth of anesthesia
* intubation (insertion of the eTT through the vocal cords) or LMa placement as standard of care
* Connection of the eTT or LMa to the anesthesia circuit
* Bag ventilation and correct eTT placement or LMa placement by observing the eTCo2 waveform and by auscultation.
-The eTT or LMa will be disconnected and the SPo2 will be allowed to drift to 92% and at that point the eTT or LMa will be reconnected to the circuit and patient ventilated with 100% o2 for 5 minutes.
The study will be stopped when:
* when the patient desaturates to 92%
* or if the patient shows signs of cardiac instability (ectopic beats, arrhythmia or hypotension)
Morphometric and demographic characteristics (including surgical procedure diagnoses), airway assessment and anesthetic information will be recorded.
* Hemodynamic measurements (blood pressure, heart rate) before and at one-minute intervals for ten minutes started with laryngoscopy will be recorded from the automatic anesthetic record (ePiC)
* Time to intubation: from the start of mask ventilation until the endotracheal tube is advanced past the vocal cords and a Co2 trace is obtained on the capnograph
-time to 99% saturation: time from the beginning of mask ventilation until 99% saturation is measured
-time to 92% saturation: from the confirmation of the eTT until 92% is measured.
* non-invasive oxygen saturation (Spo2%) will be measured continuously using Masimo Radical 7 (Masimo Corporation,) and recorded at 1sec intervals using a laptop computer with data collection software.
Data will be collected from subjects and sent to the sponsor; our site will not be involved in any data analysis. as Masimo is preparing to develop a proprietary algorithm to assess the oxygen extraction index, neither the data nor the analysis will be disclosed to our study team.
* Children scheduled for surgical procedures under general anesthesia, where the airway will be controlled with either an endotracheal tube (ETT) or laryngeal mask airway (LMA).
* Patient age 1-17 years
* American Society of Anesthesiology physical status I, II, or III.