Which enzyme pattern is most characteristic of muscular dystrophy as opposed to liver disease?

Which enzyme pattern is most characteristic of muscular dystrophy as opposed to liver disease?

• A. Elevated CK, aldolase, AST with normal ALT
• B. Elevated ALT with normal AST
• C. Elevated ALP with elevated GGT
• D. Elevated GGT with normal CK

Answer: (A)

Muscle injury from conditions like muscular dystrophy releases enzymes that are abundant in skeletal muscle into the bloodstream. Creatine kinase (CK) is the most sensitive and dramatic early marker of muscle damage, so it becomes markedly elevated. Aldolase is another enzyme rich in muscle, so it rises as well. Aspartate aminotransferase (AST) is present in both liver and muscle, so it can be elevated with muscle disease too. However, alanine aminotransferase (ALT) is more specific to the liver and tends to stay normal in pure muscle disease. Therefore, the signature pattern for muscular dystrophy is high CK, high aldolase, high AST with a normal ALT, reflecting muscle injury rather than liver injury. In contrast, liver disease typically shows elevations in ALT and AST, often with other liver-specific patterns, and muscle-specific enzymes like CK would not be elevated. Patterns involving alkaline phosphatase (ALP) and gamma-glutamyl transferase (GGT) point to biliary or bone processes, not primary muscle damage, and a rise in GGT with a normal CK would steer away from muscle involvement.

Muscle injury from conditions like muscular dystrophy releases enzymes that are abundant in skeletal muscle into the bloodstream. Creatine kinase (CK) is the most sensitive and dramatic early marker of muscle damage, so it becomes markedly elevated. Aldolase is another enzyme rich in muscle, so it rises as well. Aspartate aminotransferase (AST) is present in both liver and muscle, so it can be elevated with muscle disease too. However, alanine aminotransferase (ALT) is more specific to the liver and tends to stay normal in pure muscle disease. Therefore, the signature pattern for muscular dystrophy is high CK, high aldolase, high AST with a normal ALT, reflecting muscle injury rather than liver injury.

In contrast, liver disease typically shows elevations in ALT and AST, often with other liver-specific patterns, and muscle-specific enzymes like CK would not be elevated. Patterns involving alkaline phosphatase (ALP) and gamma-glutamyl transferase (GGT) point to biliary or bone processes, not primary muscle damage, and a rise in GGT with a normal CK would steer away from muscle involvement.