As far as I was aware, the iodine bound in non-ionic iv contrast has 
different reactive properties to the iodine found in shellfish.  I was 
under the impression that a shellfish allergy was not necessarily as 
precurser to an iodinated iv contrast allergy.
We injected a patient a few days ago that had an allergy to topical 
iodine.  She is still fine and came back in a few days later with no ill
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 From: Dieter <[EMAIL PROTECTED]>

effects to collect her films.
 
We have also had a case of a previuos anaphylatic reaction (put the
patient 
in ICU) to ionic contrast (cardiac cath).  While the patient was still 
intubated the patient came down for a abdo/pelvis CT and was injected
with 
100 mls of non-ionic contrast (the ICU staff failed to tell radiology
about 
the previuos reaction and had not documented it in the 
notes.....oops).  The patient showed no indication of rection to that 
injection and recieved another a week later.
 
I personally would be hesitant injecting anyone with any previous known 
allergy to any type of iodine unless absolutely necessary and would take

the precaution of predosing with antihistamines ie prednisolone and the
day 
before and hydrocortisone on the day of examination.
 
Bring on cheaper Gadolinium so we can use that as an alternative.
 
Dieter Halden
Nepean Hospital
NSW CTAP
 
At 08:45 18/07/2003 +1000, you wrote:
>  From: Geoffrey Dick <[EMAIL PROTECTED]>
>
>Is there any documented evidence that there is a relationship between
>allergy to seafood/shellfish and an increased chance of an iv contrast 
>reaction?  Your thoughts on the matter
>
>Geoffrey Dick
>CT Supervisor Dandenong Hospital
>Ext:48193
>03-9554-8193




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