Severe Hypertriglyceridemia as a Cause of Arterial Thrombosis with Peripheral Embolic Complications

ABSTRACT

Lead Author's Financial Disclosures Nothing to disclose. Study Funding: None. Background/Synopsis Extensive evidence exists in support of a causal association of elevated triglyceride-rich lipoprotein (TRL) levels with the risk of atherosclerosis progression. Hypertriglyceridemia has been established as a risk factor for venous thrombosis, including a 2- fold increase in the risk of venous thrombosis in postmenopausal women. However, there is limited data on the role of hypertriglyceridemia in the arterial thrombosis. Objective/Purpose: Not Applicable. Methods: Case description A 51-year-old white female with hypertension and type 2 diabetes (hemoglobin A1C, 7.4%) was transferred for further management of newly diagnosed bilateral renal and splenic infarcts. No risky habits were elicited except for the use of combined hormonal contraceptives over the past two years to control menorrhagia. Family history was significant for hypertriglyceridemia. Her physical exam was unremarkable. Testing for COVID-19 was negative. An extensive hypercoagulable and autoimmune work-up was unremarkable. Fasting lipid profile was significant for elevated levels of triglycerides, 1,274 mg/dL (replicated on two separate occasions), very low-density lipoprotein-cholesterol, 255 mg/dL, and non-high-density lipoprotein-cholesterol, 214 mg/dL, directly measured low-density lipoprotein cholesterol, 39 mg/dL and lipoprotein(a), 6 mg/dL. There was no structural pathology on the echocardiogram, including no interatrial shunt or intracardiac thrombus. Her whole-body computed tomography angiography revealed a focal calcified protruding thrombus in the distal thoracic aorta. No significant plaque was seen elsewhere in the aorta. Results: Decision-making. The posterior thrombus in the distal thoracic and proximal abdominal aorta was determined as a culprit for the visceral organ infarcts. Over the course of the hospital stay her abdominal pain gradually resolved. Treatment with low dose aspirin and therapeutic dose of low-molecular weight heparin was initiated followed by apixaban and aspirin on discharge. She was started on atorvastatin 40 mg, fenofibrate 145 mg, icosapent ethyl 4 g, resulting in a 70% reduction in the triglycerides levels (306 mg/dL). In 3 months, her repeat CT angiography showed significant resolution of the aortic atherothrombosis with no signs of aortic wall inflammation. At the 6-month follow-up visit she was switched to dual antiplatelet therapy with a plan to repeat imaging in 6 months. Conclusions: This case illustrates challenges in managing patients with arterial thrombosis in the setting of familial hypertriglyceridemia. Apart from severely elevated triglycerides no other etiology was evident. We propose further investigation of the prothrombotic properties of TRL and the role of targeted triglyceride-lowering therapies on atherothrombotic outcomes.