Blender Biomarkers: A BLENDER Sub-study to Evaluate the Effect of Oxygen Dose on Oxidative Stress and Organ Injury

Australian and New Zealand Intensive Care Research Centre

Status

Active, not recruiting

Conditions

Cardiac Failure

Critical Illness

Study type

Observational

Funder types

Other

Identifiers

NCT05542966

HREC/50486/Alfred-2019

Details and patient eligibility

About

To compare the impact of liberal vs conservative oxygen doses on markers of oxidative stress in patients enrolled in the BLENDER trial.

Full description

Extracorporeal membrane oxygen (ECMO) is a heart lung support device used for patients with severe and cardiac and respiratory failure and carries an increased risk of exposure to very high oxygen tensions. Hyperoxia (arterial oxygen >100mmHg) can lead to the production of reactive oxygen species (ROS). Excess production of ROS and depletion of antioxidant compounds is referred to as oxidative stress and results in inflammation, tissue injury and cell death. The inter-relationship between the production of ROS and end organ dysfunction is complicated and remain unclear. A more detailed assessment of the timing of changes in markers of oxidative stress, inflammatory mediators and tissue injury is warranted to understand the processes and potentially identify therapeutic targets.

The BLENDER Trial is a multicentre trial in ECMO patients to determine whether a conservative oxygen strategy during ECMO reduces ICU length of stay and improves patient outcomes compared to a liberal oxygen strategy. Currently there have been no studies that look at the underlying pathophysiological changes that occur in patients on ECMO when subjected to different oxygen concentrations. As such The BLENDER study represents a unique opportunity to understand the mechanisms by which hyperoxia may cause tissue injury in patients receiving ECMO. This nested study seeks to elucidate whether exposure to hyperoxia during ECMO results in increased oxidative stress and whether this is correlated with increased risk of tissue injury and organ dysfunction. A better understanding of the mechanism of hyperoxia induced tissue injury may allow treatment to be optimised for patients exposed to hyperoxia as part of their treatment.

Enrollment

30 patients

Sex

All

Ages

18 to 100 years old

Volunteers

No Healthy Volunteers

Inclusion criteria