Abstract 4364992: To Cath or Not to Cath? A Loeys-Dietz Clinical Dilemma

Loeys-Dietz syndrome (LDS) is a connective tissue disorder that affects the arterial system causing aneurysms, tortuosities, and dissections. Spontaneous coronary dissection (SCAD) in this population is extremely rare. Here we discuss the complex clinical decision-making in a patient with LDS presenting with chest pain and acute myocardial injury. A 30-year-old female with LDS (TGFBR2 mutation) presented to the emergency room with sudden-onset chest pain radiating to her left flank. She had a complex history having initially undergone valve-sparing aortic root replacement later followed by concomitant aortic valve replacement and aortic aneurysm repair for recurrent root dilation and aortic insufficiency. She also had various dissections and aneurysms involving the aorta and peripheral vessels that were being closely monitored. Her blood pressure was 200/100. A CTA of the chest was obtained revealing a new dissection of descending thoracic aorta. High-sensitivity troponin levels rose from 33 to 1200 over 1.5 hours and EKG showed subtle, upsloping, inferior ST elevations. Emergent echocardiogram demonstrated basal to mid inferior wall hypokinesis. Blood pressure control with esmolol and clevidipine improved her chest pain. There was resolution of her ST changes on subsequent EKGs. Therefore, emergent coronary angiography was not pursued. Still, the acute myocardial injury pattern along with EKG and echocardiographic findings were concerning for myocardial infarction, particularly SCAD. Obstructive coronary artery disease was felt to be unlikely given her age and clinical context. Cardiac catheterization was discussed but deferred due to her complex vascular anatomy with dissections and tortuosity placing her at a high risk of access complications. We instead decided to obtain a coronary CTA for risk stratification. It raised concern for dissection of the RCA. However, the study was limited due to possible streaking artifact. Due to the patient’s clinical stability, a conservative approach was chosen. She was already on anticoagulation with coumadin for her history of mechanical MVR, and beta blocker therapy. No other medications were added. SCAD in LDS is quite rare and if diagnosed, is more associated with SMAD3 mutation. In this patient population, weighing risks and benefits of making such a diagnosis is important. Here, conservative management was felt to be the best option.