Patient Tailored Contrast Volume for Preoperative CT Angiography of the Aorta

Study Overview
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Brief Summary
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An in-house calculator was developed to calculate the appropriate contrast dose, rather than standardly administering a 120ml dose. This study aims for a more uniform contrast enhancement in patients by means of adjusting (lowering) contrast dose to patient parameters.

Detailed Description
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Until now, CT scans in our and many other institutions are being performed with a fixed standard contrast dose specific for every protocol, independent of patient characteristics. However, many if not all patients would benefit from a contrast dose reduction, as long as image quality is not impaired. This is especially beneficial to patients with impaired renal function. For this purpose, we researched previous literature as well as data from previously scanned patients with standard dose, to formulate a contrast dose calculation adapted to patient parameters. An in-house calculator was developed to calculate the optimal contrast dose dependent on patient length, weight and heartrate. A total of 60 CT-scans will be performed and retrospectively collected. Patients are randomly assigned to one of three groups : 1/ Standard dose of 120ml; 2/ Calculated dose (40-150ml) 3/ Calculated dose -50% (20-120ml). In case of reduced kidney function, patients were randomly divided between group 2 and 3 (reduced contrast dose).

Official Title
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Patient Tailored Contrast Volume for Preoperative CT Angiography of the Aorta: A Prospective Study Based on Patient Heart Rate and Body Surface Area Differences

Conditions
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Aortic Aneurysm

Intervention / Treatment
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* Other: Contrast dose reduction, CT-angiography


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients requiring CT-angiography of the aorta as requested by clinician For aneurysm detection or follow-up Or for dissection follow-up Thoraco-abdominal aorta or abdominal aorta Exclusion Criteria: Contra-indications for contrast administration (severe renal impairment or adverse reactions) Previously endovascular repair of the aorta Only thoracic aorta No informed consent Contrast injection at 4cc/second not possible

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Standard contrast dose<br>Standard contrast dose administration | Other: Contrast dose reduction, CT-angiography<br>* Contrast dose reduction for CT-angiography in pre-operative aorta<br>|
| Active Comparator: Calculated contrast dose<br>Contrast dose by calculation | Other: Contrast dose reduction, CT-angiography<br>* Contrast dose reduction for CT-angiography in pre-operative aorta<br>|
| Active Comparator: Calculated contrast dose -50%<br>Contrast dose by calculation, with extra dilution by 50%. | Other: Contrast dose reduction, CT-angiography<br>* Contrast dose reduction for CT-angiography in pre-operative aorta<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Reduction in contrast dose | Reduction in contrast dose while maintaining image quality | Through study completion, an average of 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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CT-angiography, Aortic aneurysm, Aortic dissection, Pre-operative, Contrast dose reduction