MRI Under Sedation

An MRI under sedation is an ordinary MRI scan carried out with the help of a medicine that makes you feel relaxed and drowsy. It is offered to people who find it very difficult to lie still inside the scanner or to tolerate the enclosed space — for example those with severe claustrophobia, significant anxiety, involuntary movements, or difficulty staying comfortable for the length of the scan. The aim is to allow a clear, complete scan that would otherwise be impossible.

The scan itself is unchanged; only your comfort is managed differently. Sedation ranges from a mild tablet taken beforehand to a medicine given through a small cannula in a vein, adjusted so that you become calm and sleepy while still breathing on your own. It is lighter than a full general anaesthetic. Your breathing, heart rate and oxygen levels are monitored throughout by trained staff, and the amount is tailored to help you stay still long enough for the images to be captured clearly.

Because sedation affects your alertness, there is a little preparation. You may be asked not to eat for a few hours beforehand, and you will usually need a responsible adult to take you home and stay with you afterwards, as the effects take time to wear off. You should not drive or make important decisions for the rest of that day. During the scan you will feel drowsy and relaxed; afterwards you are observed until the medicine has worn off enough for you to go home safely.

Some people simply cannot complete an MRI while fully awake, yet the information the scan provides is essential for diagnosing their spinal problem. Sedation bridges that gap, making a high-quality scan achievable with less medical intervention than a general anaesthetic. The decision to use it, and the type used, is made by the clinical team after weighing the benefits against the small risks of any sedative medicine.

• —Royal College of Radiologists — iRefer: Making the Best Use of Clinical Radiology
• —Academy of Medical Royal Colleges — Safe Sedation Practice for Healthcare Procedures
• —MHRA — Safety Guidelines for Magnetic Resonance Imaging Equipment in Clinical Use

This information is for general patient education and is not a substitute for an individual consultation. Always seek personalised advice from a qualified spinal specialist.