allergic response to CT scan contrast

  • 2 replies
  • 41 subscribers
  • 516 views

This is complicated! During my cancer diagnosis, i had two CT scans with contrast, and had no problems.

However, I was taken to A&E with chest pains shortly after starting immunotherapy, and a pulmonary embolism was suspected. I therefore had a CT scan with contrast, but this time my body reacted. During the scan when the contrast was administered, it felt 'awful', with such a strong surge that I nearly cried out. The next day, my body was covered in a rash.

What I realised at the time was that the scan was carried out by one person, whereas before two radiographers were present when the contrast was injected. I have wondered since this incident whether the correct protocols were followed, and whether I was given too large or concentrated a dose.

The result of the allergic reaction is that a contrast can no longer be used when I have scans to check on the effectiveness of my immunotherapy. The scans without the contrast do not give much detail. This worries me! Hope you can answer this.

I have not mentioned my concerns about the scan carried out by one radiographer, as I have no choice but to use this hospital for my scans, and I don't want to upset anyone.

  • Hi Candysmum,

     

    Thank you for getting in touch with us and welcome to the online community.  I see that you’ve joined a few different forums and I really hope you find them helpful and supportive. 

    I’m sorry to hear that you had an allergic reaction to the contrast given during your CT to check for a pulmonary embolism (CTPA scan). 

    Usually there are two or more members of staff present during the scan.  This may be the radiologist, radiology assistant, nurse and/or healthcare assistant.  Only one will administer the contrast injection and the other(s) may be in the adjoining room.  Only one person needs to be in the same room as the patient at the time the contrast is administered. The contrast is prescribed on a patient drug chart and the prescriber (usually the radiologist) will follow the A&E protocol for that specific scan (CTPA) to determine how much contrast you will be given.

    It is possible to suddenly develop an allergy to contrast, even if you’ve had it before.  Sometimes drug allergies don’t develop until there has been repeated exposure.

    It might be helpful to speak to your treatment team about your concerns as they should have access to the drug chart from the A&E radiology department,which should be in your patient notes.  You wouldn’t be upsetting anyone and it’s completely understandable to want to know more about why you suddenly developed the allergy.  They may refer you to a specialist drug allergy service to look at this further, especially as you have been told that contrast can no longer be used in your scans.  There are different contrast compounds that could possibly be used.  Especially if a more detailed scan is needed to monitor your response to treatment. 

    I really hope this information was helpful.  Please know, you can always give us a call to talk things through further.

    Take care and best wishes

    Adrienne (Cancer Information Nurse Specialist)

    You can also speak with the Macmillan Support Line team of experts. Phone free on 0808 808 0000 (7 days a week, 8am-8pm) or send us an email.

    Ref:  AMc/GH

  • Thanks for your reply! I will follow this up when I'm next called in for a scan. I have been reluctant to have the contrast again, in case I have a more severe reaction, such as anaphylaxis. I live such a long way from the hospital, it could be a real problem!