Intelligent Oxygen Therapy During Activities of Daily Living

The Assessment of Intelligent Oxygen Therapy (iO2T) in Patients on Long-term Oxygen Therapy During Activities of Daily Living

The aim of this study is to assess whether an auto-titrating oxygen system can maintain constant oxygen saturations (SpO2) in patients who are on long-term oxygen therapy (LTOT) during activities of daily living.

Currently LTOT is provided at a constant fixed-flow rate e.g. 2 litres per minute all the time after appropriate assessment. The flow rate is not changed during usual household activities but is increased for walking. A number of studies have investigated the SpO2 of patients on LTOT during the daytime in patients' homes. The results have shown that patients' SpO2 decreases intermittently whilst they are doing activities of daily living such as watching television, putting away the shopping, having a shower or bath and dressing and undressing. This is a problem as it can lead to breathlessness, increased stress on the heart and affect brain function. In order to correct the drop in SpO2 that patients experience during everyday activities, the investigators have developed an oxygen system, which can automatically change the amount of oxygen delivered depending on a patients' oxygen saturations - an auto-titrating oxygen system. In this study, patients on LTOT will be asked to simulate a series of activities of daily living twice: once whilst on their usual fixed-flow oxygen therapy and once on the auto-titrating oxygen system. The activities will be carried out in a hospital setting. During the activities, SpO2 will be recorded continuously. The main outcome of interest from the study will be the SpO2 throughout the study on fixed-flow oxygen and the auto-titrating oxygen system.

Study Overview

• Status: Completed
• Conditions: Hypoxia; COPD; Hyperoxia
• Intervention / Treatment: Device: Intelligent oxygen therapy (an auto-titrating oxygen system); Device: Long-term oxygen therapy

Detailed Description

Long-term oxygen therapy (LTOT) is prescribed for patients with stable severe hypoxemic respiratory failure according to specific criteria set out in different guidelines from international respiratory societies. The aim of LTOT is to maintain the resting partial pressure of oxygen (PO2) >60 mmHg or oxygen saturation (SpO2) >90%.

A number of studies have demonstrated that whilst at home, patients on LTOT experience episodes of intermittent hypoxia (SpO2 <90%) and spend significant amounts of time with SpO2 <90%. These episodes of desaturation occur most frequently during activities of daily living and may be harmful as they could lead to pulmonary hypertension, arrhythmias and ischaemic heart disease. Simply increasing the LTOT flow rate by 1 or 2 litres in one option but this exposed the patients to hyperoxaemia and the risk of hypercapnia. An another method optimising LTOT is to utilise an auto-titrating oxygen system. These system allow close control of SpO2 by automatically adjusting the flow of oxygen to match a target SpO2. At the Royal Brompton Hospital and Imperial College London, the investigators have developed our own auto-titrating oxygen system - called intelligent oxygen therapy (iO2t).

This system has been tested in patients with chronic obstructive pulmonary disease (COPD) and LTOT during a 6 minute walk test with promising results (ERS 2015).

The aim of this study is to investigate whether the intelligent oxygen therapy system can reduce intermittent hypoxia in patients on LTOT during simulated activities of daily living. Patients will be asked to a series of activities of daily living over a period of 1 hour including: washing, dressing, putting away shopping and cleaning. The patients will do these activities twice: once on their usual LTOT and once on the auto-titrating oxygen system in a cross-over design.

• Study Type: Interventional
• Enrollment (Actual): 25
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United Kingdom
  • London, United Kingdom, SW3 6NP
    • Royal Brompton and Harefield NHS Trust

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Age >18 years
2. Currently on or eligible for LTOT for respiratory failure

Exclusion Criteria:

1. LTOT flow rate ≥4 litres per minute
2. Exacerbation of underlying lung disease in the past 4 weeks
3. Inability to understand English
4. Significant co-morbidities
5. Patients who lack capacity to consent
6. Pregnancy

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Activities of daily living on iO2t; Patients will complete simulated activities of daily living on intelligent oxygen therapy (an auto-titrating oxygen system)	Device: Intelligent oxygen therapy (an auto-titrating oxygen system); This device is an auto-titrating oxygen system. The system is programmed to maintain a specific target SpO2 by automatically adjusting the oxygen flow rate. The system can deliver flow rates of 0-5 litres/minute.
Active Comparator: Activities of daily living on LTOT; Patients will complete activities of daily living on their usual long-term oxygen therapy.	Device: Long-term oxygen therapy; This is the patients usual long-term oxygen therapy

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
The percentage of time spent with SpO2 <90% during the activities of daily living - 55 minutes	Calculated over the duration of the time the patient is carrying out activities of daily living (55 minutes)

Secondary Outcome Measures

Outcome Measure	Time Frame
Mean SpO2 during the activities of daily living - 55 minutes	Calculated over the duration of the time the patient is carrying out activities of daily living (55 minutes)
Mean Heart rate during the activities of daily living - 55 minutes	Calculated over the duration of the time the patient is carrying out activities of daily living (55 minutes)
Borg score for breathlessness and fatigue at the end of activities of daily living (55 minutes)	At the end of activities of daily living (55 minutes)
Total volume of oxygen delivered during simulated activities of daily living during the activities of daily living (55 minutes)	Calculated over the duration of the time the patient is carrying out activities of daily living (55 minutes)

Collaborators and Investigators

• Sponsor: Imperial College London
• Collaborators: Royal Brompton & Harefield NHS Foundation Trust; National Institute for Health Research, United Kingdom
• Investigators: Principal Investigator: Anita Simonds, FRCP, Royal Brompton & Harefield NHS Foundation Trust

Publications and helpful links

General Publications

• Mohammad Moghal, Rishi Goburdhun, Mary Morrell, Robert Dickinson, Anita Simonds A Novel Smartphone Based Auto-Titrating Oxygen System Reduces Intermittent Hypoxia During Activities of Daily Living in Patients on Long-Term Oxygen Therapy. American Journal of Respiratory and Critical Care Medicine 2017;195:A7709

Helpful Links

• This is link to PhD thesis of M Moghal showing results of study on Intelligent Oxygen therapy during Activities of Daily Living

Study record dates

Study Major Dates

• Study Start (Actual): January 1, 2016
• Primary Completion (Actual): January 1, 2017
• Study Completion (Actual): January 15, 2017

Study Registration Dates

• First Submitted: January 26, 2016
• First Submitted That Met QC Criteria: February 16, 2016
• First Posted (Estimated): February 17, 2016

Study Record Updates

• Last Update Posted (Actual): November 29, 2023
• Last Update Submitted That Met QC Criteria: November 23, 2023
• Last Verified: November 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Signs and Symptoms, Respiratory; Hypoxia; Hyperoxia
• Other Study ID Numbers: 15IC2835

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO