F-4 624074/07
F Pulse oximetry
• The pulsations from intra-aortic balloon
support can be additive to the pulse rate on the
oximeter pulse rate display. Verify patient's
pulse rate against the ECG heart rate.
• Misapplied sensors or sensors that become
partially dislodged may cause either over or
under reading of actual arterial oxygen
saturation.
• For measurements of high or low SpHb
readings, blood samples should be analyzed by
laboratory instruments to completely
understand the patient’s condition.
• Elevated levels of total Bilirubin may lead to
inaccurate SpO
2
, SpMet, SpCO, SpHb, and SpOC
measurements.
• Motion artifact may lead to inaccurate SpMet,
SpCO, SpHb, and SpOC measurements.
• Haemoglobin synthesis disorders may cause
erroneous SpHb readings.
• Loss of pulse signal can occur when
– The sensor is too tight
– The patient has hypotension, severe
vasoconstriction, severe anemia, or
hypothermia
– There is arterial occlusion proximal to the
sensor
– The patient is in cardiac arrest or is in shock
• In case of anemia and blood loss, the SpO
2
sensor is unable to detect tissue hypoxia.
• Severe anemia may cause erroneous SpO
2
read-
ings.
• Very low arterial oxygen saturation (SpO
2
)
levels may cause inaccurate SpCO and SpMet
measurements.
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