The Effect of N2O Administration on Arterial Oxygenation

A

Austin Health

Status and phase

Completed
Phase 4

Conditions

Anesthesia

Treatments

Drug: Nitrous oxide

Study type

Interventional

Funder types

Other

Identifiers

NCT00146250
H99/00835

Details and patient eligibility

About

Nitrous oxide is a standard part of most anaesthetic breathing mixtures. It has often been assumed that it reduces the amount of oxygen reaching the lower parts of the lung. However the results of previous studies and of some computer modelling suggests the opposite may be true, and that oxygen levels in the blood are actually higher with nitrous oxide. This study seeks to determine whether nitrous oxide increases or decreases blood oxygen levels in anaesthetized patients.

Full description

The concentrating and second gas effects of nitrous oxide (N2O) uptake have been well described, and are produced by rapid uptake of N2O during the first several minutes of an inhalational anesthetic. This significantly increases alveolar and arterial O2 partial pressure. Theoretical modelling of alveolar gas exchange has predicted that these effects may not be transient but may be a persisting phenomenon. However, N2O is known to promote absorption atelectasis in poorly ventilated lung units. This study, carried out pre-cardiopulmonary bypass in 20 patients undergoing coronary artery surgery, measures change in PaO2 after a minimum of 30 minutes of relaxant general anesthesia with a FIO2 of 30%. Patients are randomised to two groups. The intervention group has N2O introduced following baseline blood gas measurements, while the control group continued breathing an identical FIO2 in N2. The change in PaO2 in the two groups is the primary endpoint for comparison.

Enrollment

20 patients

Sex

All

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Patients undergoing elective coronary artery bypass surgery

Exclusion criteria

Age under 18 years, emergency surgery

Trial design

Primary purpose

Treatment

Allocation

Randomized

Interventional model

Parallel Assignment

Masking

Single Blind

20 participants in 2 patient groups

Nitrous oxide
Experimental group
Description:
Nitrous oxide 70% as balance gas in inspired mixture
Treatment:
Drug: Nitrous oxide
Nitrogen
Experimental group
Description:
Nitrogen instead of nitrous oxide 70% as balance gas in inspired mixture
Treatment:
Drug: Nitrous oxide

Trial contacts and locations

0

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Data sourced from clinicaltrials.gov

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