Closed-loop Oxygen Control in Ventilated Infants Born at or Near Term

Respiratory Disease Clinical Trial

Official title:

Does Closed-loop Automated Oxygen Control During Mechanical Ventilation Reduce Hypoxic Events? A Randomised Controlled Crossover Study in Ventilated Infants

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT05017727
• Other study ID #: 298164
• Status: Completed
• Start date: October 5, 2021
• Est. completion date: January 17, 2023

Study information

• Verified date: September 2023
• Source: King's College Hospital NHS Trust
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Ventilated neonates frequently require supplementary oxygen to allow for adequate oxygen delivery to the tissues and normal cell metabolism. Oxygen treatment should be monitored carefully as both excessive and inadequate dosing can have detrimental effects for the infants. Hypoxia (giving too little oxygen) increases mortality and later disability whereas hyperoxia (giving too much oxygen) increases the risk of complications such as retinopathy of prematurity and lung disease. Although very preterm and low birth weight infants represent the majority of ventilated neonates, more mature infants may also require mechanical ventilation at birth and provision of supplementary oxygen. Therefore, they may suffer from complications related to hypoxia or hyperoxia. Hence, their oxygen saturation levels and the amount of the inspired oxygen concentration provided should be continuously monitored.

Oxygen control is traditionally monitored and adjusted manually by the nurse looking after the infant. Closed-loop automated oxygen control (CLAC) is a more recent approach that involves the use of a computer software incorporated into the ventilator. The software uses an algorithm that automatically adjusts the amount of inspired oxygen to maintain oxygen saturation levels in a target range. Evidence suggests that CLAC increases the time spent in the desired oxygen target range, decreases the duration of hypoxia and hyperoxia and reduces the number of manual adjustments required by clinical staff. However previous studies have been limited to very small infants. With this study the investigators aim to evaluate the effectiveness of CLAC in ventilated infants born at 34 weeks gestation and beyond. The achievement of oxygen saturation targets and the number of manual adjustments required will be compared between periods of CLAC and manual control in a cohort of patients that has not been included in previous studies and could also benefit from the intervention. The investigators will also evaluate if CLAC reduces investigations performed to ventilated babies(blood gases, X-rays).

Description:

This will be a randomised controlled crossover study. The investigators aim to recruit a minimum of 31 ventilated infants born at 34 weeks completed gestation and above and admitted to the Neonatal Intensive Care Unit at King's College Hospital over one year. Participants will undergo two monitoring periods each lasting 12 hours (8:00am-20:00pm): one with standard manually controlled oxygen and one with closed-loop automated oxygen control. Randomisation will be used to determine whether the first period will be manual or closed-loop automated oxygen control. The two monitoring periods will take place on two consecutive days to allow for clinical conditions to remain as stable as possible.

Infants with known congenital cyanotic heart disease will be excluded from the study as well as those undergoing surgery or any planned procedures during the monitoring period.

Informed written consent will be requested from the parents or legal guardians of the infants and the attending Neonatal Consultant will be requested to verbally assent to the study.

Randomisation of eligible infants whose parents consent to the study will be performed using an online randomisation generator to determine whether the first monitoring period will be manual adjustment or closed-loop automated oxygen control ("intervention" period).

Patients will be ventilated using SLE6000 ventilators. Ventilation settings will be manually adjusted by the clinical team as per unit's protocol. During the intervention period, in addition to standard care, infants will be also connected to the OxyGenie closed-loop oxygen saturation monitoring software (SLE). This software uses oxygen saturations from the SpO2 probe attached to the neonate, fed into an algorithm, to automatically adjust the percentage of inspired oxygen to maintain oxygen saturations within the target range. Manual adjustments including the percentage of FiO2 will be allowed at any point during the study including the period of automated oxygen control if deemed appropriate by the clinical team. Oxygen saturation levels and automatic adjustments to the inspired oxygen concentration will be captured by the ventilator software. Manual adjustments will be recorded during both monitoring periods. In addition to data collected from the ventilator, medical notes will be reviewed to determine any adverse events or clinical interventions to participants during the study. The number of blood gas samples taken and chest radiographs performed during each monitoring period will also be recorded.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 31
• Est. completion date: January 17, 2023
• Est. primary completion date: January 17, 2023
• Gender: All
• Age group: 34 Weeks and older

Eligibility

Inclusion Criteria:

• Infants born at 34 weeks completed gestation and above requiring mechanical ventilation and admitted to King's NICU

• Any gender, ethnicity or other comorbidities

Exclusion Criteria:

• Preterm infants less than 34 weeks gestation

• Infants with cyanotic congenital heart disease

• Infants undergoing planned procedures or surgery during the monitoring period

• Infants on high frequency oscillatory ventilation (HFOV)

Related Conditions & MeSH terms

• Pre-Term
• Respiration Disorders
• Respiratory Disease
• Respiratory Tract Diseases

Intervention

Device:
• Closed-loop automated oxygen control with Oxygenie Auto-O2 software (SLE6000)
The 'Oxygenie' is a closed loop automated oxygen control system that has been incorporated into a software module for the SLE6000 infant ventilators. This software control system allows targeting SpO2 values by controlling FiO2.

Locations

Country	Name	City	State
United Kingdom	King's College Hospital NHS Foundation Trust	London

Sponsors (2)

Lead Sponsor	Collaborator
King's College Hospital NHS Trust	King's College London

Country where clinical trial is conducted

United Kingdom, 

References & Publications (27)

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* Note: There are 27 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	The decrease in the percentage of time spent in extremes of hypoxia	That will be assessed by evaluating the infant's respiratory status.	Over 24 hours
Secondary	The increase in the percentage of time spent within target oxygen saturation ranges (94-98%)	This will be assessed by evaluating the infant's respiratory status.	Over 24 hours
Secondary	The reduction in the number of manual adjustments required to the inspired oxygen concentration	That will be assessed by reviewing the infant's medical records	Over 24 hours
Secondary	The reduction in the number of blood gases and chest radiographs	That will be assessed by reviewing the infant's medical records	Over 24 hours