BeneVision N22/N19 Patient Monitor Operator’s Manual 13 - 3
13.2 SpO
2
Safety Information
• When a trend toward patient deoxygenation is indicated, analyze the blood samples with a
laboratory co-oximeter to completely understand the patient’s condition.
• Do not use SpO
2
sensors during magnetic resonance imaging (MRI). Induced current could
potentially causes burns. The sensor may affect the MRI image, and the MRI unit may affect the
accuracy of the oximetry measurements.
• Prolonged continuous monitoring may increase the risk of undesirable changes in skin
characteristics, such as irritation, reddening, blistering or burns. Inspect the sensor site every two
hours and move the sensor if the skin quality changes. Change the application site every four hours.
For neonates, or patients with poor peripheral blood circulation or sensitive skin, inspect the sensor
site more frequently.
• If the sensor is too tight because the application site is too large or becomes too large due to edema,
excessive pressure for prolonged periods may result in venous congestion distal from the
application site, leading to interstitial edema and tissue ischemia.
• Setting alarm limits to extreme values may cause the alarm system to become ineffective. For
example, high oxygen levels may predispose a premature infant to retrolental fibroplasia. If this is a
consideration, do not set the high alarm limit to 100%, which is equivalent to switching off the
alarm.
• Use only SpO
2
sensors specified in this manual. Follow the SpO
2
sensor’s instructions for use and
adhere to all warnings and cautions.
13.3 SpO
2
Measurement Limitations
The following factors may influence the accuracy of SpO
2
measurement:
â– Patient physiological characteristics:
â—† Cardiac arrest
â—† Hypotension
â—† Darkly pigmented skin
â—† Shock
â—† Severe vasoconstriction
â—† Hypothermia
â—† Severe anemia
â—† Ventricular septal defects (VSDs)
â—† Venous pulsations
â—† Poor perfusion
â– Interfering substances:
â—† Intravascular dyes (such as indocyanine green, methylene blue, indigo carmine, etc.)
â—† Dysfunctional haemoglobin, such as carboxyhemoglobin (COHb) and methemoglobin (MetHb)
â—† Dyes in the measure site, such as nail polish.
â– Environmental conditions:
â—† Excessive ambient light
â—† Electrosurgery equipment
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