What Is Carnitine Palmitoyltransferase (CPT) Deficiency?

Carnitine Palmitoyltransferase Deficiency is a rare genetic condition that affects how the body turns fat into energy. People with this disorder have changes in enzymes called CPT1 or CPT2, which help move fatty acids into cells for energy production.

When the body cannot properly use fat for fuel, certain organs and muscles may not work as they should. Symptoms can range from mild muscle problems to more serious issues involving the heart, liver, or other organs.

Symptoms are often triggered when the body needs extra energy from fat stores. Common triggers include:

• Skipping meals or fasting
• Illness or infection
• Long periods of exercise
• Cold temperatures
• Physical stress

CPT deficiency is inherited, meaning it is passed through families. A child usually develops the condition when both parents carry an altered gene related to the disorder.

Symptoms

Symptoms can differ from person to person and may begin during infancy, childhood, or adulthood.

Common symptoms may include:

• Muscle weakness
• Muscle pain after exercise
• Extreme tiredness
• Episodes of muscle breakdown (rhabdomyolysis)
• Low blood sugar (hypoglycemia)
• Dark-colored urine during muscle breakdown episodes
• Liver enlargement or liver problems
• Heart problems in severe forms of the condition
• Breathing difficulties in infants with severe disease

How Is It Diagnosed?

Healthcare providers diagnose CPT deficiency using a combination of medical history, physical examination, and specialized testing. Because symptoms can overlap with other conditions, testing helps confirm the diagnosis.

Diagnostic testing may include:

• Blood tests to look for abnormal fatty acid metabolism
• Urine tests to check for muscle breakdown
• Genetic testing
• Newborn screening
• Exercise testing in some cases
• Heart imaging, such as an echocardiogram, if heart involvement is suspected

Early diagnosis can help reduce the risk of serious complications.

How Is It Treated?

Treatment focuses on helping the body maintain a steady energy supply and preventing symptom flare-ups.

Many people benefit from lifestyle and nutrition changes, including:

• Eating frequent meals
• Avoiding fasting
• Following a high-carbohydrate eating plan
• Limiting certain fats under medical guidance
• Staying hydrated
• Avoiding overexertion

Some people with CPT2 deficiency may benefit from medications that help reduce muscle symptoms. During severe episodes of muscle breakdown, hospital care with IV fluids may be needed to protect the kidneys.

With ongoing care and careful management, many people with milder forms of CPT deficiency are able to lead active lives. Severe forms diagnosed in infancy may require more intensive treatment and monitoring.