Preoxygenation Before General Anesthesia

Anesthesia Clinical Trial

— PREOX2018  

Official title:

Assessment of Oxygenation Values Before General Anesthesia in Elective Surgery

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT03802643
• Other study ID #: 530/2018/OSS/AOUPR
• Status: Recruiting
• Start date: December 20, 2018
• Est. completion date: January 20, 2020

Study information

• Verified date: January 2019
• Source: University of Parma
• Contact: Elena Giovanna Bignami, Professor of Anesthesiology
• Phone: +390521033609
• Email: elenagiovanna.bignami[@]unipr.it
• Is FDA regulated: No
• Study type: Observational [Patient Registry]

Clinical Trial Summary

Rationale of the study: we aim to clarify the question (related to still unclear and not univocal response) about the protective or unnecessary role of preoxygenation in non-critically ill patients (otherwise with no high risk of desaturation) undergoing general anesthesia before elective surgery.

It will be also necessary differentiate the development of postoperative complications (pulmonary, cardiovascular, neurological, surgical) due to preoxygenation from the ones related with patient comorbidity, intraoperative and surgical causes, tube disconnection.

Procedure: patient's informed consent signature for adhesion at the study will be initially requested. With their acceptance, parameters will be recorded anonymously in the Case Report Form, identified by their initials and an alphanumeric code, until hospital discharge.

The parameters analyzed will be related to:

• preoperative evaluation; about anamnesis, health general conditions, blood oxygen saturation (Sat02), Metabolic Equivalent of Task (METs)

• intraoperative evaluation; about oxygenations values, recorded before/during induction and maintenance of general anesthesia

• postoperative evaluation; about postoperative complications, pulmonary primarily, and secondary cardiovascular, neurological and surgical, based on the medical record.

The data wil be transferred on Excel worksheet, utilized for descriptive analysis related at every variable. By multivariate logistic regression will be evaluated the major factors influencing postoperative pulmonary complications (PPCs) onset in patients undergoing preoxygenation for elective surgery

Description:

Background of the study:

Preoxygenation is a widely used technique that improves the safety of endotracheal intubation. The procedure is carried out by supplying 100% oxygen (FiO2 of 1.0) before the induction of general anesthesia until both end-tidal oxygen (EtO2)>90% and end-tidal N2 (EtN2)<5% are reached. Both these markers define the efficacy of the procedure. As a result, the lung oxygen content is increased far beyond normal oxygen consumption by saturating the functional residual capacity with 100% oxygen. This allows for a longer safe apnea time (i.e. the time required for oxyhemoglobin saturation to drop below 90%). The rate at which oxyhemoglobin saturation drops during apnea indicates the efficiency of the maneuver.

This procedure is strongly recommended for all patients undergoing general anesthesia since it lengthens safe laryngoscopy time and grants a wider timeframe to respond to a "cannot intubate/cannot oxygenate" (CICO) scenario, a rare yet life threatening situation. It remains unclear whether this should be considered mandatory for non-critically ill and non-obese patients since their oxygen reserves should suffice for the time required to perform endotracheal intubation or regain spontaneous breathing in the event of a CICO scenario. Nonetheless, the guidelines for the management of endotracheal intubation, proposed by the Difficult Airway Society in 2015 United Kingdom state how it is pivotal to preoxygenate every patient before attempting to intubate. Several methods of preoxygenation have been validated and compared according to duration of safe apnea time, duration of the procedure, success rate (defined as "avoiding manual re-ventilation"), and patient tolerance. The choice between these techniques is based on patient characteristics (age, sex, Body Mass Index, American Society of Anesthesiologist score, Cormack-Lehane grade and Glasgow Coma Scale), settings (e.g., operating room, Intensive Care Unit, emergency situations), equipment, and anesthesiologist's preferences. The two standard approaches are six deep breaths in 1 min and tidal volume breathing for three to 5 min, both at 100% inspired oxygen via a face mask.

The main side effect of preoxygenation is absorption atelectasis that occurs when delivering 100% inspired oxygen. This can be avoided using a lower inspired oxygen concentration (90%), positive pressure techniques, and/or recruitment maneuvers post-endotracheal intubation. Due to the short duration of the procedure, the production of reactive oxygen species and cardiovascular responses are minimal and should not prevent routine preoxygenation.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 1000
• Est. completion date: January 20, 2020
• Est. primary completion date: December 20, 2019
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• informed consent signature

• eligible for preoxygenation before general anesthesia, in elective surgery

• age > 18 years

• surgery duration > 30 min

Exclusion Criteria:

• emergency/urgent surgery

• severe respiratory disease: Chronic Obstructive Pulmonary Disease stages III-IV, pulmonary fibrosis, documented bullous emphysema, severe emphysema, pneumothorax

• uncontrolled asthma

• severe cardiac disease: Heart Failure stages III-IV (New York Heart Association), coronary artery disease stages III-IV (Canadian Cardiovascular Society)

• previous thoracic surgery

• pregnancy (excluded by anamnesis or laboratory test)

• informed consent refusal

Related Conditions & MeSH terms

• Anesthesia
• Preoxygenation

Locations

Country	Name	City	State
Italy	Azienda Ospedaliero-Universitaria di Parma	Parma

Sponsors (1)

Lead Sponsor	Collaborator
University of Parma

Country where clinical trial is conducted

Italy, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Evaluation of preoxygenation use in elective surgery, reporting oxygenations values	Assessment of its efficacy and efficiency in non-critically ill patients, reporting blood oxygen levels just before induction, during induction and maintenance of general anesthesia	From before induction of general anesthesia until the end of surgical procedure, up to 10 hours
Primary	Incidence of postoperative pulmonary complications (PPC) related to preoxygenation	Differentiating PPCs due to preoxygenation from the ones related with patient comorbidity, intraoperative and surgical causes, tube disconnection	From immediately after surgery until hospital discharge, up to 26 weeks
Secondary	Incidence of intraoperative desaturation/hypoxia		From achieved endotracheal intubation until the end of surgical procedure, up to 10 hours
Secondary	Incidence of cardiovascular postoperative complications		From immediately after surgery until hospital discharge, up to 26 weeks
Secondary	Incidence of neurological postoperative complications		From immediately after surgery until hospital discharge, up to 26 weeks
Secondary	Incidence of surgical postoperative complications		From immediately after surgery until hospital discharge, up to 26 weeks
Secondary	Incidence of Intensive Care Unit admission and its duration		From immediately after surgery until hospital discharge, up to 26 weeks
Secondary	Incidence of length of in-hospital stay		From immediately after surgery until hospital discharge, up to 26 weeks