The predominant isozyme of LDH in cardiac muscle is
In myocardial infarction, total LDH activity is increased, while H4 iso-enzyme ( monomer of LDH ) is increased 5-10 times more. The magnitude of the peak value, as well as the area under the graph, will be roughly propoional to the size of the myocardial infarct. Ref: D M Vasudevan 7th edition Page no: 304
LD-1
LD-2
LD-3
LD-5
miscellaneous