MCAD Deficiency

MCAD deficiency, also known as medium-chain acyl-CoA dehydrogenase deficiency, is a rare inherited metabolic disorder that affects the body’s ability to break down medium-chain fats into energy. This condition is present from birth and is caused by a genetic mutation passed down from both parents.

People with MCAD deficiency usually appear healthy at birth but can develop serious symptoms during periods of fasting, illness, or increased energy needs. Without prompt treatment, the condition can lead to life-threatening metabolic crises.

Symptoms

Symptoms often appear during infancy or early childhood, especially when the body runs low on glucose.

Common symptoms include:

• Low blood sugar levels

• Vomiting

• Lethargy or extreme tiredness

• Poor feeding in infants

• Seizures

• Confusion or altered consciousness

In severe cases, symptoms may progress rapidly and become life-threatening if not treated promptly.

Causes

MCAD deficiency is caused by a genetic mutation that affects an enzyme needed to break down medium-chain fatty acids.

Key causes include:

• Inherited mutation in the ACADM gene

• Autosomal recessive inheritance pattern

• Lack of functional enzyme to convert fats into energy

When fat breakdown is impaired, the body cannot produce enough energy during fasting or illness, leading to metabolic imbalance.

Risk factors

Certain factors increase the risk of complications in individuals with MCAD deficiency.

Risk factors include:

• Prolonged fasting

• Skipping meals

• Acute illness such as infections

• Vomiting or diarrhea

• Increased physical stress

• Undiagnosed condition in infancy

Early diagnosis through newborn screening significantly reduces health risks.

Complications

Without proper management, MCAD deficiency can lead to serious and potentially fatal complications.

Possible complications include:

• Severe hypoglycemia

• Seizures

• Liver dysfunction

• Brain damage

• Sudden unexplained death, especially in infants and young children

Prompt medical care during illness and strict dietary management help prevent these outcomes.

Prevention

While MCAD deficiency cannot be prevented, complications can be effectively avoided with lifelong management.

Preventive strategies include:

• Avoiding prolonged fasting

• Eating regular, frequent meals

• Following a prescribed dietary plan

• Seeking medical care early during illness

• Educating caregivers about emergency management

• Carrying medical identification indicating the condition

With early diagnosis and proper care, individuals with MCAD deficiency can lead healthy, normal lives.