Do early postoperative CT findings following type A aortic dissection repair predict early clinical outcome?

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The purposes of this study are to determine the prevalence of specific postoperative CT findings following Stanford type A aortic dissection repair in the early postoperative period and to determine if these postoperative findings are predictive of adverse clinical outcome. Patients who underwent type A dissection repair between January 2012 and December 2014 were identified from our institutional cardiac surgery database. Postoperative CT exams within 1month of surgery were retrospectively reviewed to determine sizes and attenuation of mediastinal, pericardial, and pleural fluid, and the presence or absence of pneumomediastinum, pneumothorax, or lung consolidation. Poor early clinical outcome was defined as length of stay (LOS)>14days. Student's t test and chi-square test were used to determine the relationship between postoperative CT features and early clinical outcome. Thirty-nine patients (24 M, 15 F, mean age 58.5±13.7years) underwent type A dissection repair and mean LOS was 17.3±21.2days. A subset of 19 patients underwent postoperative CTs within 30days of surgery, and there was no significant relationship between LOS and sizes and attenuation of mediastinal, pericardial, and pleural fluid, and the presence or absence of pneumomediastinum, pneumothorax, or lung consolidation. CT features such as mediastinal, pericardial, and pleural fluid were ubiquitous in the early postoperative period. There was no consistent CT feature or threshold that could reliably differentiate between "normal postoperative findings" and early postoperative complications.