If the catheter is sited too low in the jugular bulb, erroneous Sj02 values may result from mixing of intracerebral and extracerebral venous blood. This could be particularly pertinent when cerebral blood flow is low.

Ensure light intensity reading is satisfactory; if too high the catheter may be abutting against a wall, and if low the catheter may not be patent or have a small clot over the tip. Before treating the patient, always confirm the veracity of low readings against a blood sample drawn from the catheter and measured in a co-oximeter.

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