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By John G Webster
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Additional resources for Design of pulse oximeters
From this ratio of ratios and the value of the coding resistor, the microprocessor goes to an empirical look up table for its S 0 2 value. The empirical look up table is generated by the manufacturer through faboratory tests done with a CO-oximeter. The signal processing algorithms also provide some noise reduction. Some pulse oximeters use an ECG in their signal processing algorithm to minimize errors due to motion artifacts. 6 A three-wavelength pulse oximeter for COHb determination Current pulse oximeters estimate the arterial oxygen saturation of the blood by measuring absorbances at two wavelengths of light.
J. 307 457-8 Lampe G H, Wauk L Z, Whitendale P, Way W L, Kozmary S V, Donegan J H and Eger E I 1990 Postoperative hypoxemia after nonabdominal surgery: A frequent event not caused by nitrous oxide Anesth. Analg. 71 597-601 Mak V 1993 False reassurance of pulse oximetry Brit. Med. J. 1 State the fundamental question a clinician should ask when assessing the cardiopulmonary condition of a critically ill patient. 2 Give the normal values for Sa02 and Pa02 in the healthy adult. 3 State the difference between hypoxia, hypoxemia and hyperoxia.
It is interesting how measuring S p 0 2 has become so associated with measuring S a 0 2 . Copyright © 1997 IOP Publishing Ltd 20 Design of pulse oximeters Nonetheless, it follows that any limitations associated with S a 0 2 as a monitored variable are also associated with Sp02. There are some caveats to using S a 0 2 to assess the condition of pulmonary function. It is difficult to regard any monitoring technique as foolproof, as there are usually misleading combinations of conditions that will result in the monitored variable appearing fine when, in fact, a potentially dangerous condition could exist for the patient.
Design of pulse oximeters by John G Webster