Licox catheter system is used to

Appeared in: KPSC Staff Nurse - 2021

Explanation

The Licox catheter system is specifically designed to monitor the partial pressure of oxygen in brain tissue (PbtO₂).
It also measures brain temperature, providing two key data points to assess cerebral metabolic status.
This direct measurement of brain oxygenation helps in the early detection of cerebral hypoxia and ischemia, allowing for timely intervention.
Low PbtO₂ readings can indicate compromised cerebral blood flow, elevated intracranial pressure (ICP), or systemic hypoxia.

Option B: The Licox catheter does not have a drainage function.
Option C: The Licox catheter is a monitoring device, not a drug delivery system.
Option D: While low brain oxygen can be related to high ICP, the Licox catheter itself does not measure pressure.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of Neurocritical Care Monitoring Devices as background academic context rather than a clinical decision trigger.
In patients with traumatic brain injury (TBI), subarachnoid hemorrhage, or other causes of cerebral edema, monitoring PbtO₂ with a Licox catheter is crucial for preventing secondary brain injury from ischemia.
A nurse's role includes monitoring the PbtO₂ and temperature readings, correlating them with other parameters like ICP, CPP, and systemic vitals, and implementing orders to optimize brain oxygenation (e.g., adjusting ventilator settings, administering vasopressors).
What if? If a patient's PbtO₂ drops below 15 mmHg, but their ICP and CPP are within the target range, the nurse should suspect a systemic cause of hypoxia. The priority action would be to check the patient's arterial oxygen saturation (SpO₂), recent arterial blood gas (ABG) results, and hemoglobin levels to rule out systemic hypoxia or anemia before focusing solely on intracranial dynamics.

How to Approach the Question

First, identify the key term in the question stem: 'Licox catheter system'.
This is a factual recall question that requires knowledge of specialized neurocritical care equipment.
Think about the different types of monitoring and interventions performed in the brain: pressure monitoring (ICP), fluid drainage (CSF), oxygen monitoring (PbtO₂), and drug delivery.
Recall or deduce the specific function of the Licox system. The 'ox' in Licox is a clue related to oxygen.
Evaluate each option. Associate 'drain CSF' with an EVD, 'administer chemotherapy' with an Ommaya reservoir, and 'assess ICP' with an ICP bolt or ventriculostomy.
This process of elimination, combined with recognizing the device's name, leads to 'assess cerebral oxygenation' as the correct function.

Concept Tested & Keywords

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E6 Nursing Brunner Adult Health 3SA Vol 2 Part 2 p. 31-33

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