# Influencing factors of false lumen thrombosis in type B aortic dissection: A single-center retrospective study

## TL;DR

This study identifies age and dissection length as factors influencing false lumen thrombosis in type B aortic dissection patients.

## Contribution

The study reveals that older age and shorter dissection length are associated with higher likelihood of false lumen thrombosis in TBAD patients.

## Key findings

- Patients in the complete thrombosis group were significantly older than those in other groups.
- Shorter dissection lengths were associated with complete thrombosis of the false lumen.
- Primary tear size, last tear size, and total number of tears were linked to partial thrombosis.

## Abstract

To evaluate the factors associated with false lumen thrombosis in preoperative type B aortic dissection (TBAD) patients.

Between January 2008 and December 2017, TBAD patients were evaluated. Participants were divided into patent, partial thrombosis, and complete thrombosis groups according to the status of the false lumen. Univariate analysis and logistic regression analysis were used to identify the factors associated with false lumen thrombosis.

A total of 285 participants fulfilled our inclusion criteria. Patients in the complete thrombosis group were significantly older than those in the partial thrombosis and patent groups (59 ± 10 vs 53 ± 11 and 50 ± 11 years, respectively), and combined shorter dissection lengths (290 ± 101 vs 354 ± 92 and 351 ± 102 mm, respectively). The following factors were associated with partial thrombosis of the false lumen with an odds ratio (OR) <1: primary tear size (OR, 0.96; 95% confidence interval [CI], 0.93–0.99; p = 0.03), last tear size (OR, 0.93; 95% CI, 0.87–0.99; p = 0.04), and the total number of tears (OR, 0.87; 95% CI, 0.78–0.98; p = 0.02).

TBAD patients older than 59 years or with aortic dissection lengths of less than 290 mm were more likely to have a thrombosed false lumen.