You have a patient who has a ventriculostomy drain in place for intracranial pressure monitoring and continuous cerebral spinal fluid drainage. As the primary RN what will you do to ensure an accurate reading of the ICP waveform?

A. Make sure patient is laying flat is incorrect because the head of the bed should generally be elevated to 30 degrees to promote venous drainage and reduce ICP. Laying flat may actually increase intracranial pressure and does not ensure an accurate ICP waveform reading. B. Close the drain to stop CSF drainage for 6 minutes is correct because when the ventriculostomy is open to drain CSF, the ICP reading may not reflect true intracranial pressure, as CSF is continuously leaving the ventricles. To obtain an accurate ICP waveform, the nurse temporarily clamps or closes the drain for a short period (typically 5–10 minutes) while monitoring the patient, then documents the reading. This ensures the waveform reflects actual intracranial pressure rather than the pressure altered by ongoing drainage. C. Empty drainage tube is incorrect because draining CSF from the collection chamber does not directly affect ICP waveform accuracy. The waveform represents ventricular pressure, and emptying the tube does not change the measurement as long as the system remains patent. D. Check patient's vital signs is incorrect because while vital signs are important for overall assessment and detecting signs of increased ICP, they do not ensure an accurate ICP waveform reading. Vital signs can indicate changes secondary to ICP but are not a substitute for waveform assessment.