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Cardiac amyloidosis produces specific alterations to the functionality of the heart. Echocardiography can be utilized to detect this specific pattern (relative preservation of the apical myocardium with decreased longitudinal strain in the mid and basal sections), which is 90–95% sensitive and 80–85% specific for cardiac amyloidosis. [4]
AL amyloidosis occurs in about 3–13 per million people per year and AA amyloidosis in about two per million people per year. [2] The usual age of onset of these two types is 55 to 60 years old. [2] Without treatment, life expectancy is between six months and four years. [2]
Amyloid cardiomyopathy (stiff heart syndrome) [5] is a condition resulting in the death of part of the myocardium (heart muscle). It is associated with the systemic production and release of many amyloidogenic proteins , especially immunoglobulin light chain or transthyretin (TTR). [ 6 ]
AL amyloidosis is a rare disease; only 1200 to 3200 new cases are reported each year in the United States, and between 500 and 600 in the UK. Two thirds of patients with AL amyloidosis are male and less than 5% of patients are under 40 years of age. [6] [19] [9]
Wild-type transthyretin amyloid (WTTA), also known as senile systemic amyloidosis (SSA), [1] is a disease that typically affects the heart and tendons of elderly people. It is caused by the accumulation of a wild-type (that is to say a normal ) protein called transthyretin .
Cardiac involvement is often identified with the presence of conduction system disease (sinus node or atrioventricular node dysfunction) and/or congestive heart failure, including shortness of breath, peripheral edema, syncope, exertional dyspnea, generalized fatigue, or heart block.
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