During transport of an extraventricular drain, the transducer should be kept level with which landmark?

• A. The tragus of the ear
• B. Nipples
• C. Xiphoid process
• D. Medial malleolus

Answer: (A)

The main idea is to keep the drain’s pressure transducer at the same vertical level as the brain’s ICP reference point. In a patient who is supine, that reference plane lines up with the tragus of the ear, so leveling the transducer to the tragus ensures accurate monitoring of intracranial pressure. If the transducer sits higher than this level, the reading will appear falsely low; if it sits lower, the reading will appear falsely high. During transport, adjust and secure the setup so the transducer remains even with the tragus, maintaining a stable head position. Other landmarks like the nipples, xiphoid process, or medial malleolus are not aligned with the intracranial pressure reference plane and would distort the measurement.