In this observational study, researchers examined 201 patients with type B dissection and classified them according to whether the false lumen of the aortic dissection was patent, partially thrombosed, or completely thrombosed. Patients with partial thrombosis of the false lumen, as compared with complete patency, had a significant higher mortality rate at 3 years (31.6±12.4% versus 22.6±22.6%). The partial thrombosis resulted in diastolic and mean arterial blood pressures in the false lumen exceeding the pressures seen in a patent false lumen which may explain these findings.
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