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During treatment the arterial pressure reading, which is normally negative, drifts from -80 mmHg to -240 mmHg and alarms. What is the most likely cause?
A
The machine cannot pull blood freely from the access: the arterial needle is against the vessel wall or infiltrated, the line is kinked or clamped, or the pump speed is set too high for the access
B
Air has been detected in the venous line
C
Blood is clotting in the venous drip chamber
D
The bicarbonate concentrate container has run empty