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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT03496493
Other study ID # UCT_Anaes_201801
Secondary ID
Status Completed
Phase
First received
Last updated
Start date April 15, 2018
Est. completion date December 31, 2018

Study information

Verified date February 2019
Source University of Cape Town
Contact n/a
Is FDA regulated No
Health authority
Study type Observational

Clinical Trial Summary

Perioperative non-invasive measurement of a patient's peripheral arterial oxygen saturation has become an accepted standard of care endorsed by anaesthesiologists and their regulatory bodies throughout the world. Pulse oximeters are an integral item on the World Health Organisation's Surgical Safety Checklist which is performed prior to the commencement of every surgical procedure. They are also utilised by other medical professionals and patients in various scenarios. When compared to conventional bedside pulse oximeters, portable fingertip devices have the advantages of cost-effectiveness, high portability, ease of use and battery operation. A review of recent literature reveals a paucity of accuracy studies in adult patients with various comorbidities in the clinical setting. Most data has been obtained under ideal laboratory conditions utilizing healthy adult volunteers. This study aims to pragmatically investigate the performance of a portable fingertip pulse oximeter in adult patients in a hospital setting.


Description:

The purpose of this prospective, quantitative study is to compare the agreement between the measured arterial oxygen saturation levels using a portable fingertip versus a conventional bedside pulse oximeter in adult surgical patients, presenting for elective and emergency surgery to Groote Schuur Hospital over a four-week period. Adult surgical patients, not meeting any exclusion criteria, who present for elective or emergency surgery will be recruited. 200 data pairs (SpO2, heart rate and skin tone) will be recorded in the perioperative period (operating rooms, recovery room and intensive care unit).

Existing monitoring devices will not be disturbed. The agreement between the two devices will be compared using a Bland-Altman plot, Microsoft Excel and SPSS software. A root mean square difference value will also be calculated from these values.

No sensitive or personal patient information will be recorded, and pulse oximetry is essential harmless. Potential cross-infection will be avoided by excluding patients with known communicable diseases or open wounds/ bodily fluids in the area to have the oximeter probes applied. The study devices will be disinfected after each use. Recruitment will not affect clinical care.

The significance of this study into the performance of portable fingertip pulse oximeters in adult surgical patients will result in the availability of cheaper devices, deemed as vital anaesthetic equipment by the WHO and various anaesthetic regulatory bodies, in lower income medical facilities. It will also give anaesthetists and other medical personal the confidence to make clinical decisions based on these highly portable devices, thereby making pulse oximeters more available in resource limited areas. It will also add further data to existing studies and help assess whether darker skin pigment affects the performance of these devices in the clinical setting, which is highly relevant in an African country like South Africa.


Recruitment information / eligibility

Status Completed
Enrollment 220
Est. completion date December 31, 2018
Est. primary completion date June 11, 2018
Accepts healthy volunteers
Gender All
Age group 18 Years and older
Eligibility Inclusion Criteria:

- Adult surgical patients presenting for elective or emergency surgery

Exclusion Criteria:

- Contact precautions due to high risk of transmissable infectious disease

- Significant hypotension or hypoperfusion (systolic blood pressure <80 mmHg, or hypothermia)

- Motion artefacts due to excessive patient movements

- Known presence of variant haemoglobin species (eg. carboxy- or methaemoglobin)

- Intraoperative dye use (eg. methylene blue or indocyanine green)

- Nail polish or black henna

- Tape or bandages over the fingers

- Absent/inadequate pulse oximetry tracing on existing monitor

Study Design


Related Conditions & MeSH terms


Intervention

Device:
All patients
Peripheral arterial oxygen saturation recording with both study devices

Locations

Country Name City State
South Africa Groote Schuur Hospital Cape Town Western Cape

Sponsors (1)

Lead Sponsor Collaborator
University of Cape Town

Country where clinical trial is conducted

South Africa, 

Outcome

Type Measure Description Time frame Safety issue
Primary Saturation measurement agreement Bland-Altman analysis of saturation measurement pairs, with a priori acceptable limits of agreement (1.96 x SD measurement differences) within 3%. This is in accordance with ISO and FDA guidelines for testing of these devices (see relevant standard). 1 minute
Secondary Average root mean square difference Average root mean square difference in saturation pairs between the oximeters of less than 3% 1 minute
Secondary Skin tone effect Subgroup analysis of effect of skin tone (Fitzpatrick scale) on oximeter agreement (provisional on adequate recruitment across groups) 1 minute
Secondary Perfusion (pulse magnitude) effect on oximeter agreement Subgroup analysis of effect of magnitude of pulse waveform signal (as an indication of finger perfusion on oximeter agreement. This will be graded qualitatively as good, poor, or absent waveform, and is provisional on adequate recruitment across groups. 1 minute
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