The Stealth StationTM Image Guidance System may interfere with pulse oximetry: (Le systeme de guidage par imagerie Stealth StationTM peut nuire a la sphygmo-oxymetrie).

摘要

PURPOSE: Interference on pulse oximetry can come from many sources. We found an additional source of interference from the Stealth Stationtrade mark. This article gives an overview of sources of pulse oximeter interference so that clinicians can better prevent them.Technical features: This article discusses the infrared disturbances caused by the Stealth Stationtrade mark. The Stealth Stationtrade mark is a frameless stereotactic positioning system that utilizes a three dimensional location system to measure the position of the patient and the surgical tools, and to relate those positions to previously recorded imaging. To understand the disturbance caused by the Stealth Stationtrade mark, we discuss its operation and that of pulse oximeter monitors. Pulse oximeter interference can come from volume artifacts, electrical and light noise, and can be caused by issues related to the patient. Because the passive Stealth Stationtrade mark contains a strong infrared light source, interference caused by light is a likely reason for the interference we noted. Pulse oximeters rely on the time-variant light signal modulated by arterial volume variations in the finger. Although relatively immune to static light sources, pulse oximeters are extremely sensitive to time-varying light sources. The light emitted by the passive Stealth Stationtrade mark is time-varying at 4 Hz and this is causing the pulse oximeter to provide invalid results. Shielding can generally be used to stop the light from the Stealth Stationtrade mark from being picked up by the pulse oximeter sensor. CONCLUSION: Infrared light interference can be very common, but is easily dealt with if one is aware of it.