BACKGROUND: Aortic dissection requires prompt and reliable diagnosis to reduce high mortality rate. This study is designed to assess the specificity, sensitivity, positive and negative predictive values of Computed Tomography and Aortography in evaluating for thoracic aortic dissection by intraoperative findings. Specific objectives are to be able to know the which type of dissection according to Stanford classification is sensitive to detection and to be able to know which type of dissection either acute or chronic is sensitive for detection.
METHODS: For over an eight month period from January 1,2000 to August 31, 2000, there were a total of 21 patients who were operated involving the aorta at the Philippine Heart Center setting, Department of Thoracic and Cardiovascular Surgery, Vascular service. However , 8 charts of patients were not available for review and likewise 8 of the 21 patients were included in this study. The remaining; 5 patients were excluded because of incomplete study.
RESULTS: The sensitivity, specificity, positive and negative predictive values of Computed Tomography and Aortography validated intraoperatively were as follows: 66.7%,66.7%; 80.0%" 100.0%; 66.7%, 100.0%, 80.0%, 83.3% , respectively. Aortography is significant in evaluating for aortic dissection with a p value of 0.018 whereas the CT Scan does not show any significance.
CONCLUSION: The C'T Scan and Aortogram show similar sensitivity but aortogram is highly specific with high predictive value for aortic dissection based on preliminary findings. No conclusive evidence is yet made because of the limited number of patients and the duration of the study is until December of this year.