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Three dimensional computed tomographic imaging in planning the surgical approach for redo cardiac surgery after
Hrvoje Gasparovic1, Frank J Rybicki, John Millstine
1Division of Cardiac Surgery, Brigham and Women's Hospital, Boston, MA, USA.
Insights
Three-dimensional computed tomographic (CT) imaging improves surgical planning for reoperative cardiac surgery. This advanced imaging technique accurately maps coronary artery bypass grafts and mediastinal structures, reducing complications.
Area of Science:
- Cardiovascular Surgery
- Medical Imaging
- Thoracic Surgery
Background:
- Reoperative cardiac surgery post-coronary artery bypass grafting (CABG) presents significant surgical challenges.
- Standard preoperative imaging (coronary angiogram, chest radiograph) often provides inaccurate mediastinal anatomy assessment.
- Potential for injury to patent grafts, aorta, or right ventricle necessitates precise anatomical mapping.
Purpose of the Study:
- To evaluate the utility of 3D volume-rendered computed tomographic (CT) imaging.
- To assess its role as an adjunct to standard preoperative assessment for reoperative cardiac surgery patients with prior CABG.
- To optimize surgical strategy by improving visualization of mediastinal structures.
Main Methods:
- 33 patients with prior coronary revascularization underwent preoperative 3D CT imaging.
- Conventional coronary angiography and chest radiography (CXR) were compared with 3D CT angiography (CTA).
- Analysis focused on the accuracy of mapping graft and structure positions relative to midline and sternum.
Main Results:
- 3D CT angiography (CTA) demonstrated superior accuracy in mapping graft and structure positions compared to CXR and conventional angiography.
- Correlations for graft and structure distances were poor with conventional methods (R values typically <0.6).
- Surgical strategy was modified in 21% of patients based on 3D CT findings, with no injuries to patent LIMA or aorta reported.
Conclusions:
- 3D CT imaging is a valuable tool for defining optimal surgical strategies in reoperative cardiac surgery.
- CTA provides superior definition of patent grafts and vital structures compared to CXR and conventional angiography.
- Preoperative mapping with 3D CT reduces reoperation morbidity by enabling modified surgical approaches.
Objective:
Reoperative cardiac surgery after previous coronary artery bypass grafting represents a surgical challenge due to the potential for injury to patent coronary grafts, aorta or right ventricle. Standard preoperative imaging using a coronary angiogram and chest radiograph (CXR) often results in inaccurate assessment of mediastinal anatomy. We aimed to evaluate 3D volume rendered computed tomographic imaging as an adjunct to standard preoperative assessment of patients requiring cardiac surgery in whom coronary artery revascularization had been performed in the past.
Methods:
Between January 2003 and January 2004, 33 patients with previous coronary revascularization referred for reoperative cardiac surgery underwent preoperative 3D CT imaging in order to optimize the surgical approach. The mean age in this patient population was 72+/-8 years. The combined evaluation of CXR and conventional angiography offered incomplete insight into pertinent mediastinal topography in 85% of patients (28/33).
Results:
The correlations for distances of the left internal mammary artery (LIMA) to left anterior descending artery (LAD) graft from the midline and posterior sternum obtained by CT angiography (CTA) and CXR were poor, R=0.56 and 0.49, respectively. The correlation coefficients for distances between the right ventricle and the aorta to the sternum obtained by the same methods were similarly marginal, 0.58 and 0.48, respectively. The correlation coefficients for distances between the LIMA to LAD, circumflex and right coronary artery grafts from the midline obtained by CTA and conventional angiography were 0.54, -0.13 and 0.43, respectively. In seven patients (21%) the surgical strategy was modified based on the location of patent grafts in the mediastinum. The hospital mortality was 17% (5/29). Intraoperative injuries to vital structures were encountered in two patients (7%). No injuries to patent LIMA or the aorta were encountered.
Conclusions:
The 3D CT imaging technique is useful in defining the optimal surgical strategy for reoperative cardiac surgery. We found that CTA is superior to CXR and conventional angiography in defining the position of patent grafts and vital structures in relation to the midline and posterior sternum. Preoperative mapping of patent coronary grafts and other vital mediastinal structures reduces the morbidity of the reoperation through modification of surgical approaches.
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