Virtual Reality Computed Tomography Evaluation　- Anatomy and Clinical Implications for Valve-Sparing Aortic Root...

Area of Science:

• Cardiovascular Surgery
• Medical Imaging
• Virtual Reality Applications

Background:

• Three-dimensional (3D) evaluation of the aortic root using virtual reality (VR) for valve-sparing aortic root replacement (VSARR) preparation is novel.
• This study introduces and assesses the utility of VR computed tomography (VR-CT) for VSARR.

Purpose of the Study:

• To demonstrate the application of VR-CT for detailed aortic root anatomical assessment.
• To evaluate the correlation between VR-CT measurements and intraoperative findings for VSARR.
• To determine the role of preoperative VR-CT measurements in graft sizing for VSARR.

Main Methods:

• 72 patients undergoing elective VSARR for annuloaortic ectasia with a tricuspid aortic valve were included.
• Aortic root geometries were measured using a VR-CT workstation, analyzing parameters like geometric height (GH), free margin length (FML), and commissural height (CH).
• VR-CT measurements were compared with intraoperative findings.

Main Results:

• Significant differences in commissural height (CH) were observed between different cusp pairs.
• The left coronary cusp exhibited the shortest FML, intercommissural distances (ICD), and smallest central angle.
• VR-CT measurements showed strong correlations with intraoperative data, particularly for mean GH (R²=0.75) and left coronary/noncoronary CH (R²=0.79).
• Preoperative mean GH was significantly different across graft size groups, suggesting its importance in graft selection.

Conclusions:

• VR-CT provides a comprehensive understanding of aortic root anatomy.
• This detailed anatomical insight facilitated by VR-CT can enhance the preparation and execution of valve-sparing aortic root replacement (VSARR).