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Trial record 33 of 621 for:    oximeter

Accuracy of Pulse Oximeters With Profound Hypoxia

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: NCT02571686
Recruitment Status : Completed
First Posted : October 8, 2015
Last Update Posted : December 24, 2015
Information provided by (Responsible Party):
Mortara Instrument

Brief Summary:
The aim of this project is to test the accuracy of pulse oximeters during mild, moderate and severe hypoxia. This is done by comparing the reading of the pulse oximeter during brief, steady state hypoxia with a gold-standard measurement of blood oxyhemoglobin saturation (arterial blood sample processed in a laboratory hemoximeter). The data obtained is submitted by pulse oximeter manufacturers to the FDA for device approval.

Condition or disease Intervention/treatment
Oximetry, Pulse Device: Surveyor S4

Detailed Description:

Overall design:

Studies normally involve 6-12 normal adult volunteer paid subjects, with 20-25 1-2 ml arterial blood samples from each subject obtained at different steady-state levels of hypoxia from 70-100%. Blood samples obtained from an arterial line are measured in a hemoximeter to determine true saturation value. Some sponsors may not require any blood sampling. Some sponsors may require additional blood samples, up to 35 samples may be drawn.

Readings from the test pulse oximeters are recorded and compared to these "gold-standard" blood values. The pulse oximeter probes may be located at a variety of sites on the subjects, including fingers, toes, ears, forehead, scalp and bridge of the nose. These detector-probes are all non-invasive. The level of hypoxia is measured and controlled by the investigator. A computer program that displays a prediction, breath by breath, the arterial oxygen saturation, (SaO2) of the study subject. SaO2 is computed from end-expired Po2 and Pco2 as determined by mass spectrometer gas analysis. This information permits the inspired gas mixture of air, plus CO2 and nitrogen, to be adjusted by an operator watching the value computed after each expiration on an analog meter. This computer-estimated saturation is adjusted by the operator to one of 6 levels of predicted saturation, and is held stable for about 30 seconds at each level. Two or three "runs" are conducted per subject. Each "run" lasts 8-12 min and 4 to 5 plateaus are tested per run. The manufacturer may choose the target values. Plateaus are typically sought at 92%, 86%, 80%, 74%, 68% and 62%. Other manufacturers have asked for an equal number of data points but with all points between 70% and 100%. Some sponsors may also request additional variables to be measured during testing including high or low Carbon Dioxide (CO2), where subjects will be asked to hyperventilate; low perfusion, where subjects will be asked to lay flat, or with their head up or down; testing pulse oximeters during motion, with the subject's hand fixed to a motion machine; or measure eye-tracking during hypoxia. The subject's will be informed by the study staff and in the consent form if any of these additional procedures apply.


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Study Type : Observational
Actual Enrollment : 10 participants
Time Perspective: Prospective
Official Title: Accuracy of Pulse Oximeters With Profound Hypoxia
Study Start Date : October 2015
Actual Primary Completion Date : October 2015
Actual Study Completion Date : October 2015

Primary Outcome Measures :
  1. Accuracy of Pulse Oximeter [ Time Frame: 2 months ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
10-12 healthy volunteers

Inclusion Criteria:

  1. The subject is male or female, aged ≥18 and <50.
  2. The subject is in good general health with no evidence of any medical problems.
  3. The subject is fluent in both written and spoken English.
  4. The subject has provided informed consent and is willing to comply with the study procedures.

Exclusion Criteria:

  1. The subject is obese (BMI>30).
  2. The subject has a known history of heart disease, lung disease, kidney or liver disease.
  3. Diagnosis of asthma, sleep apnea, or use of CPAP(Continuous positive airway pressure).
  4. Subject has diabetes.
  5. Subject has a clotting disorder.
  6. The subject a hemoglobinopathy or history of anemia, per subject report or the first blood sample, that in the opinion of the investigator, would make them unsuitable for study participation.
  7. The subject has any other serious systemic illness.
  8. The subject is a current smoker.
  9. Any injury, deformity, or abnormality at the sensor sites that in the opinion of the investigators' would interfere with the sensors working correctly.
  10. The subject has a history of fainting or vasovagal response.
  11. The subject has a history of sensitivity to local anesthesia.
  12. The subject has a diagnosis of Raynaud's disease.
  13. The subject has unacceptable collateral circulation based on exam by the investigator (Allen's test).
  14. The subject is pregnant, lactating or trying to get pregnant.
  15. The subject is unable or unwilling to provide informed consent, or is unable or unwilling to comply with study procedures.
  16. The subject has any other condition, which in the opinion of the investigators' would make them unsuitable for the study -

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): NCT02571686

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United States, California
Department of Anesthesia Clinical Studies Facility, room A-65 Parnassus Campus.
San Francisco, California, United States, 94143
Sponsors and Collaborators
Mortara Instrument

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Responsible Party: Mortara Instrument Identifier: NCT02571686     History of Changes
Other Study ID Numbers: 139253
First Posted: October 8, 2015    Key Record Dates
Last Update Posted: December 24, 2015
Last Verified: December 2015
Additional relevant MeSH terms:
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Signs and Symptoms, Respiratory
Signs and Symptoms