MRI under anaesthesia
Clinical Procedure
 
Aliases:
Anaesthesia for magnetic resonance imaging scan
GA MRI
Anaesthesia for MRI

Topic aliases are alternate phrasings for a particular topic.


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See Cardiac MRI, MRI brain, MRI spine, MRI abdomen and MRI cholangiogram for specific considerations.

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Any ferromagnetic objects are attracted to the scanner and pose a risk to patients and staff.

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Consider wheeling the circuit closer to the patient to increase available length of airway tubing.

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Develop a habit of patting yourself down everytime as you're about to enter the MRI room to ensure you have no objects in your pockets.
#safety

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Patient will need to be taken out of MRI in event of arrest. Equipment required during arrest will not be MRI safe.

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If contrast will be injected (tumour or cardiac scans), connect extension tubing to the intravenous cannula so that the patient can remain in the tunnel during the injection.

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Gadolinium contrast may stimulate breathing during breath hold if patient not paralysed, reducing image quality of cardiac/thoracic/abdominal images.

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Breath hold is usually at the very end of the scan, so paralysing for this event may prolong anaesthetic. Consider propofol bolus instead.
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Expiratory breath holds may be required for some patients. LMA may be suitable for PPV in some patients (allowing for breath holds), otherwise intubate.

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Hypercapnia >60mmHg degrades image, consider ventilating the patient if this becomes a problem

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MRI brain:
Head bobbing from poor LMA placement may degrade image. Optimise sizing or intubate if necessary

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Anaesthesia for magnetic resonance imaging CCEACP dx.doi.org/10.1093/bjacea...

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