Clinical significance of the relative apical sparing pattern of longitudinal strain in patients with cardiac amyloidosis

Background The relative apical sparing pattern (RASP) of left ventricular (LV) longitudinal strain (LS) is frequently associated with cardiac amyloidosis (CA). However, some patients with CA do not show the RASP, and their clinical characteristics have not been fully clarified. We sought to investigate the clinical significance of RASP in patients with CA. Methods One hundred consecutive CA patients who were diagnosed by biopsy or myocardial...