Lying completely still inside a loud, enclosed scanner for 30 to 60 minutes can be difficult. For patients with severe claustrophobia, involuntary movements, or young children who cannot remain quiet, radiology departments offer sedation. Sedation uses medications to help you relax or sleep during the scan, ensuring clear images.
Types of sedation used
Depending on your anxiety levels and the type of scan, the team will recommend one of three levels of sedation:
- Mild oral sedation: You swallow a tablet (like diazepam) before the scan. You will remain awake but feel calm and relaxed.
- Conscious IV sedation: Medication is injected through an intravenous line in your arm. You will feel very drowsy and may sleep through the scan, but you can be easily awoken.
- General anesthesia: Used primarily for infants and young children, or complex procedures. The patient is fully asleep and monitored by an anesthetist.
Strict fasting guidelines are essential
If you or your child are receiving IV sedation or general anesthesia, you must follow strict fasting rules beforehand. This is a vital safety precaution to prevent food or liquid from entering the lungs while asleep.
- No solid food: For 6 hours before the appointment.
- No clear liquids: For 2 hours before the appointment (this includes water).
Failing to follow these guidelines will result in your scan being cancelled immediately for your safety.
What to expect after the scan
Because sedatives take time to wear off, you will need to spend 1 to 2 hours in a recovery area after your scan.
- Do not drive: Adults who receive sedation must arrange for a family member or friend to drive them home. You cannot take public transport alone or drive a car for 24 hours.
- Childcare: Children may remain sleepy, unsteady on their feet, or irritable for several hours. Monitor them closely and avoid activities like running or climbing until the next day.
A comforting close
Sedation is a safe and common way to make a difficult scan manageable. If you know you struggle with tight spaces or have concerns about your child remaining still, discuss sedation options with your referring doctor well before your appointment.