seizure CT scan preparation

Overview

A CT scan (computed tomography) is a painless imaging test that uses X-rays to take detailed pictures of the inside of your brain. After a seizure, doctors often order a CT scan to check for problems in the brain, such as bleeding, a stroke, or a growth, that may have caused the seizure. Preparing for the scan is simple and usually involves following a few instructions from your care team.

Yes. CT scans are a standard and common test in emergency departments for people who have had a seizure.

It is used for people of any age who have a first-time seizure, a change in their usual seizure pattern, or certain types of seizures.

Symptoms

Common symptoms

• Uncontrollable jerking or twitching of arms or legs
• Loss of consciousness or awareness
• Staring blankly and not responding
• Confusion or feeling disoriented after the episode

Symptoms in children

• Brief staring spells that may look like daydreaming
• Sudden stiffness or falling
• Temporary pauses in breathing or blue lips

Symptoms in older adults

• Falls or fainting without a clear cause
• Memory lapses or confusion
• Unusual sensations or repetitive movements

Causes

Main causes

• Head injury or trauma
• Stroke or bleeding in the brain
• Brain infection such as meningitis
• Low blood sugar or electrolyte imbalance
• Brain tumor or abnormal growth

Risk factors

• Previous head injury
• Family history of seizures
• Alcohol or drug use
• History of stroke or brain infection
• Abnormal blood vessel in the brain

When to see a doctor

See a doctor urgently if:

• Call emergency services if the seizure lasts more than 5 minutes or is a first-time seizure
• Seek urgent care if you have repeated seizures or serious injury during the seizure

Book a routine appointment if:

• If you have a known seizure disorder and have a new type of seizure, contact your doctor within a day or two
• Make a follow-up appointment to discuss your CT scan results

Diagnosis

If you arrive after a seizure, a doctor will first check your breathing and heartbeat. They will ask about what happened and examine you. A CT scan is one of the main imaging tests used to look inside the brain for structural causes.

Tests that may be done

• CT scan (computed tomography)
• EEG (electroencephalogram) to measure brain electrical activity
• Blood tests to check glucose, electrolytes, or signs of infection

What to expect at your appointment

You will lie flat on a table. The table will slide into a large, donut-shaped machine. The scan is painless. You may receive a contrast dye through a small needle in your arm before or during the scan. The scanner will make some whirring and clicking noises. You will be asked to stay very still. The whole process usually takes 10 to 30 minutes, including preparation.

Treatment

A CT scan itself is not a treatment. It helps your doctor find out what may have caused your seizure so they can treat the underlying problem. Depending on the results, treatment may include medication, procedures, or close monitoring.

Self-care at home

• After the scan, drink extra water if you received contrast dye, unless your doctor says otherwise
• If you feel dizzy or nauseous after the scan, let the staff know before you leave
• Arrange for someone to drive you home, especially if you were given a sedative at the emergency department

Medical treatments

Seizures are often treated with anti-seizure medicines to reduce the chance of more seizures. The specific medicine your doctor prescribes will depend on your seizure type, age, other health conditions, and the cause found on the scan. Your doctor will also treat any underlying cause, such as an infection or blood vessel problem. Always take medicines exactly as prescribed.

When is surgery considered?

If the CT scan reveals a structural problem, such as a tumor, bleeding, or a blood vessel malformation that can be reached, surgery may be recommended. Surgery is not needed for every cause, and your care team will discuss your options if it is a possibility.

Living with this condition

Living with seizure worry is understandably stressful. Get a written plan from your doctor about what to do if another seizure happens. Carry a medical alert card or bracelet that lists your condition and emergency contacts. The CT scan itself is a one-time event, but the results help guide your next steps.

Lifestyle tips

• Keep a seizure diary with dates, times, and any possible triggers you notice
• Get enough sleep, as lack of sleep can make seizures more likely
• Avoid alcohol or recreational drugs, as these can lower the seizure threshold
• Wear a helmet if you are at high risk of falls during seizures

Diet and exercise

Eating regular, balanced meals helps keep your blood sugar steady. Exercise is generally safe for most people who have seizures, but check with your doctor first. Avoid activities where a sudden seizure could be very dangerous, such as swimming alone or working at heights.

Mental health and emotional wellbeing

Seizures can cause anxiety, fear, and low mood. It is normal to feel concerned about when the next one might happen. Talk to your doctor about these feelings. They can connect you with counselling or a support group.

Prevention

Not all seizures can be prevented, but you can lower the risk of known triggers. For seizures related to head injury, always use seatbelts and helmets. If you have diabetes, good blood sugar control may reduce the chance of seizure-related low sugar. The findings on your CT scan may also help your doctor treat an underlying cause that could otherwise cause more seizures.

Complications

If left untreated

• If a serious cause such as a brain bleed or tumor is not found and treated, it can lead to lasting brain damage or become life-threatening
• Repeated seizures can affect memory, attention, and quality of life
• Injuries from falls during a seizure can happen

Long-term outlook

Many people who have a single seizure never require long-term treatment. When a cause is found and treated, the outlook is often very good. CT scans are safe and quick, and having one is an important step in making sure you receive the right care. Your medical team will guide you through the next stage with your results in hand.

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