Page 2169 - Cote clinical veterinary advisor dogs and cats 4th

Computed Tomography Scan 1083.e3

• Make sure all needed equipment is available ❏ Omnipaque 240 (240 mg iodine/ SUGGESTED READING
and functional. This is especially important • Re-scan mL) = 14,000 ÷ 240 = 58.3 mL Fields R, et al: Optimization of contrast-enhanced
VetBooks.ir (nonveterinary) facility. • Briefly review images. in sedated canine patients. Vet Radiol Ultrasound
if the study is to be performed at an outside
multidetector abdominal computed tomography
○ Rarely, the images obtained identify an
53:507-512, 2012.
Possible Complications and
Common Errors to Avoid additional area of concern that should be ADDITIONAL SUGGESTED
scanned before the patient is allowed to
• Complications associated with general recover from general anesthesia. READING
anesthesia Cintia R, et al: Thoracic computed tomography in
• Complications associated with the adminis- Postprocedure feline patients without use of chemical restraint.
tration of IV contrast agent (rare in animals Routine monitoring of the patient during Vet Radiol Ultrasound 52:368-376, 2011.
but can include anaphylaxis or renal damage) recovery from general anesthesia
RELATED CLIENT EDUCATION
Procedure Alternatives and Their Relative
• Anesthetize the patient. Merits SHEETS
• Position the patient within the CT gantry; MRI advantages: Consent to Perform Computed Tomography Procedures and Techniques
positioning depends on the area of interest • Far superior contrast resolution (CT Scan)
and, in some cases, the size of the patient: • No beam-hardening artifact (artifact occurs Consent to Perform General Anesthesia
○ Connect IV fluids, place heating pad or in CT and severely limits evaluation of
blankets, and so forth. structures surrounded by dense bone such AUTHOR: Patricia L. Rose, DVM, MS, DACVR
• Scan as the brainstem) EDITORS: Leah A. Cohn, DVM, PhD, DACVIM; Mark S.
• Inject IV contrast agent: 600-800 mg iodine/ MRI disadvantages: Thompson, DVM, DABVP
kg of body weight as a bolus: • Longer imaging times and therefore longer
○ The concentration of iodine varies with time under general anesthesia
the contrast agent used. • Poor imaging of bone
○ Sample calculation: 20-kg patient using • If available, MRI is the preferred imaging
a dosage of 700 mg iodine/kg: method for evaluation of the central nervous
Total dose = 14,000 mg iodine: system.
■
❏ Renografin 60 (292.5 mg iodine/
mL) = 14,000 ÷ 292.5 = 47.9 mL

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