A patient who has suffered a traumatic brain injury is admitted to the ICU with a ventriculostomy drain in place to monitor intracranial pressure. Which of the following nursing interventions is most important in preventing complications related to the ventriculostomy drain?

A. Clamp the drain for 10 minutes before moving the patient to reduce the risk of infection: Clamping the ventriculostomy drain unnecessarily can increase intracranial pressure (ICP) and risk cerebral ischemia. Infection prevention is primarily achieved through strict aseptic technique during handling and insertion, not by routinely clamping the system. B. Flush the ventriculostomy drain with normal saline every shift to prevent obstruction: Routine flushing of a ventriculostomy with saline is generally contraindicated because it can introduce pathogens and increase the risk of infection or sudden changes in ICP. Obstruction should be managed according to protocol, usually with careful assessment and minimal manipulation. C. Ensure that the drainage system is positioned at the correct level to maintain accurate ICP readings: Proper leveling of the drainage system at the specified reference point (often the foramen of Monro or tragus of the ear) is essential for accurate ICP monitoring and safe cerebrospinal fluid drainage. Incorrect leveling can lead to over- or under-drainage, increasing the risk of complications such as intracranial hypotension or herniation. D. Position the patient flat in bed to ensure adequate drainage and prevent displacement of the drain: Patients with ventriculostomy drains are usually positioned with the head of the bed elevated 30 degrees to promote venous return and decrease ICP. Lying flat is not recommended and may increase ICP, while proper positioning focuses on patient safety and accurate drainage.