A 63 yo AA male presents with pain in his chest, fatigue, dyspnea and reports that he passed out yesterday. Upon physical exam you note lower extremity edema b/l. You observe low voltage on his EKG with no other findings. His echocardiogram shows dilated atria, thickened ventricular walls without chamber dilation and an ejection fraction of 60%. Genetic testing reveals a mutated transthyretin gene. What is the most likely cause of your patient's symptoms?a. Dilated cardiomyopathy b. DVTc. Restrictive cardiomyopathyd. Hypertrophic cardiomyopathy

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