Antimyosin antibody was originally developed for in vivo detection of
acute myocardial infarction. However, its utility has expanded to incl
ude diagnosis of various cardiovascular diseases in which myocyte necr
osis constitutes an obligatory component of the disease. Thus antimyos
in has also been used clinically for noninvasive diagnosis of acute my
ocarditis, heart transplant rejection, drug-induced cardiotoxicity, an
d other cardiomyopathies. This first-generation monoclonal antibody, a
ntimyosin, has opened the way for the second-generation monoclonal ant
ibodies such as antifibrin and antiplatelet for in vivo diagnostic use
in the detection of deep venous thrombosis and pulmonary embolism and
antiatherosclerotic lesion-specific antibody for diagnosis of metabol
ically active lesions. Whether the third generation of antibodies will
include ultrasmall antigen-binding units or negative charge-modified
antibodies must await future studies.