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Trial record 20 of 620 for:    oximeter

COMparison of Portable Fingertip Versus Conventional Pulse OximeteRs Trial (COMFORT)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03496493
Recruitment Status : Completed
First Posted : April 12, 2018
Last Update Posted : February 21, 2019
Information provided by (Responsible Party):
Ross Hofmeyr, University of Cape Town

Brief 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.

Condition or disease Intervention/treatment
Anesthesia Hypoxemia Device: All patients

Detailed 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.

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Study Type : Observational
Actual Enrollment : 220 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Perioperative Comparison of the Agreement Between a Portable Fingertip Pulse Oximeter Versus Conventional Bedside Pulse Oximeter in Adult Patients
Actual Study Start Date : April 15, 2018
Actual Primary Completion Date : June 11, 2018
Actual Study Completion Date : December 31, 2018

Group/Cohort Intervention/treatment
All patients
All patients enrolled in trial will have peripheral oxygen saturation simultaneously recorded with both study devices on non-adjacent (second and fourth) fingers of the same hand.
Device: All patients
Peripheral arterial oxygen saturation recording with both study devices
Other Names:
  • Nihon-Kohden Lifescope BSM 3562 patient monitor
  • Contec CMS50D fingertip pulse oximeter

Primary Outcome Measures :
  1. Saturation measurement agreement [ Time Frame: 1 minute ]
    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).

Secondary Outcome Measures :
  1. Average root mean square difference [ Time Frame: 1 minute ]
    Average root mean square difference in saturation pairs between the oximeters of less than 3%

  2. Skin tone effect [ Time Frame: 1 minute ]
    Subgroup analysis of effect of skin tone (Fitzpatrick scale) on oximeter agreement (provisional on adequate recruitment across groups)

  3. Perfusion (pulse magnitude) effect on oximeter agreement [ Time Frame: 1 minute ]
    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.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Sampling Method:   Non-Probability Sample
Study Population
All adult surgical patients presenting for elective or emergency surgery within an academic teaching hospital. Patients will have measurements made in the perioperative period in areas where conventional monitoring of pulse oximetery occurs, such as anaesthesia preassessment areas, induction rooms, operating theatres, recovery areas, ICU and PAHCU.

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

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03496493

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South Africa
Groote Schuur Hospital
Cape Town, Western Cape, South Africa, 7925
Sponsors and Collaborators
University of Cape Town
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Principal Investigator: Ross Hofmeyr, FCA(SA) University of Cape Town

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Responsible Party: Ross Hofmeyr, Associate Professor, Dept Anaesthesia & Perioperative Medicine, University of Cape Town Identifier: NCT03496493     History of Changes
Other Study ID Numbers: UCT_Anaes_201801
First Posted: April 12, 2018    Key Record Dates
Last Update Posted: February 21, 2019
Last Verified: February 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Yes
Plan Description: Raw study data will be uploaded to an open sharing platform ( or similar) after publication of the study.
Supporting Materials: Study Protocol
Statistical Analysis Plan (SAP)
Time Frame: Upon publication of the study, to remain available indefinitely.
Access Criteria: Open access after publication

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: Yes
Device Product Not Approved or Cleared by U.S. FDA: No
Pediatric Postmarket Surveillance of a Device Product: No
Product Manufactured in and Exported from the U.S.: No
Keywords provided by Ross Hofmeyr, University of Cape Town:
pulse oximetery
Additional relevant MeSH terms:
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Signs and Symptoms, Respiratory
Signs and Symptoms