A client has a multilumen central catheter with the infusions shown. The nurse must flush the unused saline-locked lumen without delivering medication remaining in a vasopressor line. Click the access port that matches that instruction.

D. D leads to the unused independent lumen and does not join either active infusion circuit.

Trace the entire path, not just the nearest segment. C appears separate near its port but joins the norepinephrine circuit at the filled junction; flushing it could push residual medication rapidly. D has no shared junction and leads to the unused lumen described in the instruction.

The observations are fictional teaching data. Apply the stated context; the selected feature does not by itself replace a complete bedside assessment.

Trace every connection to the patient before accessing or flushing a line.

Trace every connection to the patient before accessing or flushing a line.

A is on the vasopressor trunk. B belongs to the active maintenance infusion rather than the unused lumen. C joins the vasopressor circuit. D alone is the unused independent route.

• Independent lumen identification before flushing — Trace every connection to the patient before accessing or flushing a line.
• Comparison with context — C is physically separate at the port but merges downstream with the drug circuit.