What Determines Aortic False Lumen Growth Post Dissection?
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1 Aortic Dissections What Determines Aortic False Lumen Growth Post Dissection? UCSF Vascular Symposium April 26, 2012 Most common aortic emergency Incidence of aortic dissections are 2/100,000 person-years Risk factors HTN (smoking, dyslipidemia, cocaine use) Connective tissue disorders Trauma Iatrogenic injuries Acute vs. chronic Branch vessel obstruction, malperfusion syndromes and rupture Aneurysm formation, rupture Aortic Dissections Medical Therapy Concept of anti-impulse therapy proposed by Wheat et al in % 1 year survival in 6 patients (2 ascending & 4 descending) Daily reported 5 year series of 35 dissections Proposed classification scheme of ascending (type A) and descending (type B) to guide treatment Surgery reserved for type A and medical therapy for type B Medical therapy today Goal SBP < 120 HR < 60 β-blocker are first line agent as they decrease aortic wall shear stress 90% of patients w/ type B dissections can be managed with medical therapy alone 1
2 Medical Therapy Long term results are not ideal Mortality may be as high as 50% over 5 years Large fraction of mortality may be related to comorbid conditions Up to 25% will have late aortic related complications A vulnerable aorta Natural History of Chronic Dissection Can we identify who is likely to experience aorta related events? Are there clinical features may be used to roughly estimate the late risk? Continued pressurization of thin, weak false lumen wall Aneurysmal degeneration and potentially rupture Does a patent false lumen affect the long term outcome in type B dissection? Does false lumen thrombosis have a better long term prognosis? 2
3 Single institution retrospective review Nippon medical school series 110 patients with medically managed type B dissection Treated from CT scans reviewed for up to 10 years of follow up 87 censored cases and 11 lost to follow up at 10 years All cause mortality, dissection related morbidity and mortality Eur J Cardiothorac Surg 2004 vol. 26 (2) pp Eur J Cardiothorac Surg 2004 vol. 26 (2) pp Univariate analysis failed to identify variables leading to false lumen thrombosis Multivariable modeling identified patent false lumen as independent factor for dissection related events HR 7.6 (95% CI ) p = <0.01 Single institution retrospective review Kurume University, Japan 76 patients with medically managed type B dissection Treated from Mean follow up 53 +/- 35 months 2 lost to follow up Eur J Cardiothorac Surg 2004 vol. 26 (2) pp Ann Thorac Surg 2004 vol. 78 (4) pp
4 Ann Thorac Surg 2004 vol. 78 (4) pp Ann Thorac Surg 2004 vol. 78 (4) pp Single institution retrospective review University of Ulsan, South Korea 100 patients with acute aortic dissection Mix of type A and type B Excluded patients with inhospital mortality during initial admission 6 patients with Marfans Mean follow up 53 +/- 26 months Complete healing of aorta in 6 patients 4
5 Presenting false lumen diameter correlated with upper thoracic aortic aneurysm formation Total aortic diameter did not OR 1.5 (95% CI ) p < 0.01 Upper thoracic false lumen diameter > 22 mm Predicts late aneurysm formation with sensitivity of 100% and specificity of 76% Heart Rate Control and Aortic Events Prospective cohort study from Kumamoto, Japan Effect of tight heart rate control on medical management of type B aortic dissections Enrolled 171 patients with acute type B dissections Excluded patients with complicated aortic dissection Excluded Marfans patients Grouped outcomes according to standard medical therapy (SBP < 120 mm Hg) or standard therapy with tight HR control (HR < 60 bpm) One year follow up surveillance CT Mean follow up 27 months Composite endpoint of any aortic event Circulation 2008 vol. 118 (14 Suppl) pp. S
6 Heart Rate Control and Aortic Events Heart Rate Control and Aortic Events Circulation 2008 vol. 118 (14 Suppl) pp. S Circulation 2008 vol. 118 (14 Suppl) pp. S Summary Medically managed chronic type B aortic dissection has a significant long term morbidity and mortality 75% mortality at 3 years Up to 20% will develop aortic aneurysms within 2 years Risk factors for aneurysm formation Persistent flow through the false lumen Upper thoracic aorta false lumen diameter > 22 mm on presenting CT scan Marfans syndrome HR > 60 bpm 6
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