According to the laboratory results you provided (S.Bilirubin 0.6 Direct 0.4 Indirect 0.2 S.G.O.T 51 U/L S.G.P.T 60 U/L Alk. Phos. 89 U/L), the results are within normal range with the exception of SGOT (AST) whose normal range varies between 8-40 U/L. SGOT (serum glutamic oxalocetic transaminaze) also known as AST (aspartate transaminaze) is an enzyme that is closely related to liver cells. It is elevated in acute liver damage like hepatitis, for example.
Problems with the billiary ducts might also elevate AST levels. There are other conditions that might be suspected and are totally unrelated to the liver-like damage of the cardiac cells, because one of the subtypes of AST is found there. The everyday laboratory tests do not distinguish these two isoenzymes.
Your brother might want to visit a specialist for internal diseases for a physical examination and an ultrasound scan of the liver. The doctor might need an ECG and an ultrasound scan of the heart to check the condition of the heart.
Your brother is advised to keep a healthy lifestyle with moderate exercises, avoid alcohol consumption and fatty meals.