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Nonin and Choice Oximeter Review - Normal Cases

Nonin and Choice oximeter reivew: This is the third in a series of articles in comparing the performance of oximeters made by Nonin and Choice. We used the four oximeters Onyx 9500, MD300C63, GO2, and MD300C1 to take measurements under eight simulated conditions. These conditions are presets in the BIOTEK Index SpO2 Simulator and simulate eight different common clinical situations.

In summary, all the oximeters performed very well and within their specifications.

BioTek Presets Conditions

The BioTek preset feature combines SpO2 levels, heart rates and signal length (blood perfusion) into 8 preset conditions, which simulate a broad range of normal and abnormal conditions. The intent is to challenge the oximeter under test with a variety of patient conditions to show operation over a complete range. The following table shows the predefined conditions.

Pulse Rate Saturation Signal Strength
Normal 55 98% 5.0%
Weak Pulse 95 90% 0.65%
Bradycardia 45 88% 5.0%
Hypoxic 95 70% 2.0%
Neonate 180 90% 1.0%
Tachycardia 130 85% 1.2%
Geriatric 95 92% 2.4%
Obese 90 93% 3.0%

SpO2 Measurements

To understand these numbers, please read Understanding Pulse Oximeter Accuracy. Slight variance (3% to 5%) among the readings for a given setting is normal.

The following table shows the SpO2 measurements obtained during the tests.

BioTek Onyx 9500 MD300C63 GO2 MD300C1
Normal 98% 98% 98% 98% 98%
Weak Pulse 90% 90% 88% 92% 93%
Bradycardia 88% 88% 87% 89% 90%
Hypoxic 70% 70% 74% 70% 71%
Neonate 90% 90% 91% 91% 90%
Tachycardia 85% 85% 87% 87% 87%
Geriatric 92% 92% 93% 92% 93%
Obese 93% 92% 93% 92% 94%

Pulse Rate Measurements

The following table shows the pulse rate readings obtained. The readings showed little differences among them. Unless the patient has heart flutter or fibrillation, counting the number of pulses should not be difficult.

BioTek Onyx 9500 MD300C63 GO2 MD300C1
Normal 55 55 55 55 55
Weak Pulse 95 95 95 9596
Bradycardia 45 45 45 4545
Hypoxic 95 95 95 9595
Neonate 180 180 180 180179
Tachycardia 130 130 130 130130
Geriatric 95 95 95 9595
Obese 90 90 90 9091

References

  1. Paul Batchelder and Dena Raley, "Maximizing the Laboratory Setting for Testing Devices and Understanding Statistical Output in Pulse Oximeter", International Anesthesia Research Society, Vol. 105, No. 8, August 2007.

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