Chest CT With Iterative Reconstruction as an Alternative to Conventional Chest X-ray Prior to Heart Surgery "CRICKET"


Phase N/A Results N/A

Trial Description

To assess if information about aortic calcification obtained from routine preoperative ultra low-dose chest CT lowers the postoperative stroke rate in patients undergoing heart surgery by optimizing surgical strategy compared to the normal work-up with a conventional chest X-ray.

Detailed Description

During heart surgery the aorta is clamped to initiate cardiopulmonary bypass. This may crush aortic calcifications causing them to embolize to the brain causing a stroke which is a devastating complication for the patient. A chest X-ray is routinely performed prior to heart surgery. It provides no information about aortic calcification. Imaging by a chest computed tomography (CT) scan provides detailed information on aortic calcification but has higher radiation exposure and thus is not used routinely. Recently iterative reconstruction (IR) techniques have become available that allow chest CT to be performed at markedly reduced dose with retained image quality. Routine use of low dose chest CT with IR prior to heart surgery may identify patients with a severely calcified aorta in which the surgery may subsequently adapted to minimize or avoid aortic manipulation which may reduce stroke rate.
In this multicenter randomized controlled clinical trial the effect of preoperative chest CT on postoperative stroke is investigated. In total 1724 patients will be included of whom 862 patients will receive an additional CT to standard care and 862 patients will receive routine care.



  • CT scan Other
    Other Names: computed tomography
    Intervention Desc: The intervention group receives both standard care (chest x-ray) and an ultra low dose CT thorax without contrast.
    ARM 1: Kind: Experimental
    Label: CT scan
    Description: Routine clinical care, which includes a chest x-ray, with an additional ultra low-dose non contrast enhanced chest CT with IR (performed preoperatively).

Trial Design

  • Allocation: Randomized
  • Masking: Open Label
  • Purpose: Diagnostic
  • Intervention: Parallel Assignment


Type Measure Time Frame Safety Issue
Primary Postoperative stroke Participants will be followed for the duration of hospital stay, an expected average of 5 days No
Secondary Altered surgical approach The surgery will take place the day after hospital administration. No