Figure 2:31P spectra from rat
myocardium in situ. Tallest peak corresponds to phosphocreatine
(PCr). The three downfield peaks correspond to the ?, ?,
and ? phosphate of ATP, while the upfield peak corresponds to
inorganic phosphate (Pi) and phosphomonoesters as well as phosphodiesters.
The spectra are from rat myocardium in situ: A) control
B) dopamine stimulated C) post dopamine stimulated
D) left anterior descending (LAD) ligated heart. The
PCr/Pi ratio changes during dopamine stimulation and under LAD
ligation, reflecting an alteration in cellular bioenergetics.