Change in absorbance at 540 nm, an index of LV mitochondrial swelling, following addition of 100 nmol Ca2+/mg mitochondrial protein. *P <0.05 for the DHA treated heart failure group compared to untreated heart failure; ^ P <0.05 for untreated sham compared to untreated heart failure. Groups sizes were 15 and 20 for the untreated sham and heart failure groups, respectfully, and 14 and 20 for the DHA treated sham and heart failure groups, respectfully