Transnasal Humidified Rapid Insufflation Ventilatory Exchange in Morbidly Obese

Not Applicable

Completed

• Conditions: Anesthesia; Anesthesia Intubation Complication
• Interventions: Procedure: high flow passive oxygenation; Procedure: low flow passive oxygenation

• Registration Number: NCT03550924
• Lead Sponsor: Medical University of Vienna

Brief Summary

This project will investigate the duration of apnea without desaturation when using transnasal humidified rapid insufflation ventilatory exchange (THRIVE) vs. low flow nasal oxygen at anesthesia induction in obese patients.

Detailed Description

Background Providing safe anesthesia for surgery in obese patients requires specific consideration of the pathophysiological changes and respiratory complications are frequent. Anesthesia induction needs special attention in this patient population. A decrease in functional residual capacity (FRC) after induction of anesthesia dramatically shortens the duration of apnea without desaturation (DAWD) during which the airway can be secured.

Several measures such as positioning in a semi sitting position, preoxygenation with PEEP and passive insufflation of oxygen during laryngoscopy have been shown to prolong the DAWD. None of these measures is able to produce positive endexpiratory pressure (PEEP) during laryngoscopy which would counteract the loss of FRC and therefore prolong the DAWD further.

Transnasal humidified rapid insufflation ventilator exchange (THRIVE, also knowns as "high flow nasal oxygen therapy" and "heated and humidified nasal oxygen") devices have been used for several years in intensive care and are available from numerous vendors. With THRIVE, heated and humidified oxygen is insufflated via nasal prongs at a rate up to 120 l/minute and it has been shown that this creates levels of PEEP, proportional to the amount of gas flow. Using THRIVE during the apneic phase of anesthesia induction in obese patients might be superior compared to low flow oxygen techniques as THRIVE generates PEEP during laryngoscopy, which might counteract the loss of FRC and consequently might prolong the DAWD.

Aim of the project This project will investigate the DAWD when using THRIVE vs. low flow nasal oxygen at anesthesia induction in obese patients.

Hypothesis The duration of apnea without desaturation is longer in the "THRIVE" group compared to the "low flow oxygen" group.

Methods The study will be conducted as a single center, prospective, randomized, controlled trial at the Medical University of Vienna, Austria.

Forty adult patients of the ASA classification 2 and 3 with a BMI \>40 undergoing elective surgery under general anesthesia will be included. Patients with expected difficult airway, patients with an oxygen saturation \<98% despite preoxygenation, patients with nasal obstruction, smokers (\>10 cigarettes/day), patients with chronic respiratory disease, patients unable to give consent, and pregnant or breastfeeding patients will be excluded.

Patients will be randomly assigned to one of two groups ("low flow oxygen" or "THRIVE" group) and anesthesia will be induced in a standardized fashion in both groups. During laryngoscopy, patients in the low flow group will receive nasal oxygen insufflation at a rate of 10 l/min and patients in the THRIVE group will receive oxygen at a rate of 120 l/min via a THRIVE system. Difficult laryngoscopy will be simulated and intubation will be performed as soon as oxygen saturation drops to 95%. The time from anesthesia induction until oxygen saturation drops to 95% (DAWD) will be measured.

Study Timeline

• Study First Submitted: 2018-05-28
• Study First Submitted QC: 2018-06-07
• Study First Posted: 2018-06-08
• Study Start: 2018-07-26
• Primary Completion: 2020-01-22
• Study Completion: 2020-01-22
• Status Verified: 2020-09
• Last Update Submitted: 2020-09-01
• Last Update Posted: 2020-09-02

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 40

Inclusion Criteria

• Adult patients
• American Society of Anesthesiologists physical status classification class 2-3
• BMI > 40
• elective surgery under general anesthesia

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Exclusion Criteria

• expected difficult airway (El Ganzouri Risk Index > 6)
• oxygen saturation of less than 98% despite adequate preoxygenation,
• nasal obstruction
• smoker, more than 10 cigarettes per day
• chronic respiratory disease
• FEV1 (forced expiratory volume in one second) < 70%
• elevated intracranial pressure
• unable to give informed consent
• Pregnant or breast feeding

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
THRIVE Group	high flow passive oxygenation	high flow passive oxygenation during laryngoscopy with 120l/min oxygen via THRIVE system
Low flow Oxygen Group	low flow passive oxygenation	low flow passive oxygenation during laryngoscopy with 10l/min oxygen via standard nasal prongs

Primary Outcome Measures

Name	Time	Method
Duration of safe apnea	duration from the application of rocuronium until the oxygen saturation drops to 95% during laryngoscopy or a maximum of 15 minutes if the oxygen saturation does not drop to this level.	The duration until oxygen saturation drops to 95% during laryngoscopy

Secondary Outcome Measures

Name	Time	Method
blood gas analysis	every 2 minutes after rocuronium was given until 2 minutes after intubation	arterial blood samples will be taken every 2 minutes after rocuronium was given until 2 minutes after intubation

Trial Locations

Locations (1)

Medical University of Vienna; 🇦🇹 Vienna, Austria