Normal Transaminases in Methamphetamine- and Heroin-Associated Hyperammonemic Encephalopathy

Area of Science:

• Hepatology
• Toxicology
• Addiction Medicine

Background:

• Life underwriters and medical directors face challenges in detecting undisclosed substance abuse.
• Elevated serum transaminases are commonly assumed indicators of liver damage in substance abusers.

Observation:

• A 44-year-old male with long-term, combined inhaled methamphetamine and heroin use (speedballs) and minimal alcohol consumption presented with normal transaminases.
• The patient experienced episodes of acute liver failure and transient hepatic encephalopathy due to hyperammonemia.

Findings:

• This case challenges the assumption that normal transaminases indicate a healthy liver in heavy substance abusers.
• Serum transaminases may not reflect the true extent of liver damage in individuals with combined methamphetamine and heroin abuse.

Implications:

• Normal liver enzyme levels should not be relied upon to exclude significant liver pathology in methamphetamine and heroin abusers.
• This finding has critical implications for risk assessment in life underwriting and clinical management of substance use disorders.