Echocardiographic findings of patients with transthyretin amyloid cardiomyopathy.

Transthyretin amyloid cardiomyopathy (ATTR-CM) is becoming increasingly recognized with the aging population, advancements in understanding of disease pathobiology and the potential benefits of emerging therapies. Bone scintigraphy, including ^99mTc-labeled pyrophosphate scintigraphy, is currently considered the first-line modality for identifying ATTR-CM. Therefore, it is important to increase the preset probability using inexpensive and simple tests including echocardiography. Although there were a lot of typical echocardiographic findings of amyloid cardiomyopathy, unexplained left ventricular (LV) wall thickness, LV apical sparing, and a discrepancy between LV wall thickness and QRS voltage were selected as red flags/clues for ATTR-CM in various current diagnostic algorithms. Although echocardiography is useful for ATTR-CM screening, there are several limitations. Therefore, it is important to perform echocardiography and combine it with physical examination, laboratory findings, and other imaging data.