What is Reye Syndrome? Symptoms, Causes, and Treatment

Reye Syndrome

Reye syndrome is a rare but serious condition that particularly affects children and adolescents. It usually develops following viral infections such as influenza or chickenpox. It primarily targets the liver and brain cells. The disease was named after the Australian pathologist Dr. R. Douglas Reye, who first described it in 1963.

What is Reye Syndrome?

In this syndrome, the cells responsible for the body's energy production are damaged. While a sudden and severe impairment occurs particularly in the liver's detoxification capacity, edema, or swelling, may also develop in the brain. Reye syndrome presents a rapidly progressing clinical picture with potentially serious consequences and mostly occurs in childhood, immediately following viral infections. It is much rarer in adults. The rarity of the disease, the fact that its symptoms can initially mimic the effects of a viral upper respiratory infection, and the reality that many physicians see very few cases throughout their careers make the diagnosis and treatment of Reye syndrome challenging. Therefore, raising awareness among the public and healthcare professionals is of great importance.

What Are the Symptoms of Reye Syndrome?

Symptoms of Reye syndrome typically begin immediately after a viral infection. In the initial stage, an unexpected deterioration in the child's general condition may be observed. Typical symptoms can be listed as follows:

Severe and persistent vomiting: This is one of the most prominent and early signs. Vomiting is often sudden and worsens in a short time.

Behavioral changes: Irritability, excessive sleepiness, confusion, and sometimes aggressiveness may be observed. In younger children, crying fits or a loss of connection in communication may occur.

Changes in consciousness level: Drowsiness, sluggishness, speech impairment, loss of consciousness, or even a comatose state may develop. The stages of Reye syndrome consist of phases that can progress from mild irritability to a comatose condition.

Seizures: Although rare, epilepsy-like seizures may be seen in some patients.

Headache: Reye syndrome headache can also be one of the early signs of the disease.

Liver enlargement and tenderness: There may be pain or tenderness in the upper right side of the abdomen. Due to liver involvement, Reye syndrome may be observed alongside jaundice in some children.

Physical changes: In some cases, Reye syndrome is notable for a tense expression in the facial muscles, known as lion face.

With the progression of the disease, severe signs such as respiratory irregularities, low blood pressure, and even shock may emerge. Especially in young children, since severe signs can develop even within the first hours of the disease, it is important for families and healthcare professionals to pay close attention to the symptoms.

How Does Reye Syndrome Occur?

The exact cause of Reye syndrome is still not fully understood, but several important risk factors have been identified in the development of the disease. Reye syndrome is most commonly associated in pediatrics with the use of aspirin following a viral infection. Uncontrolled medication use after a flu-like infection holds great significance regarding the risk of Reye syndrome.

Aspirin was commonly used as a pain reliever and fever reducer in children; however, research conducted since the 1970s has shown that administering aspirin to children with viral infections significantly increases the risk of Reye syndrome. Therefore, the use of aspirin in children is not recommended today except under very special circumstances.

The fundamental mechanism in Reye syndrome is the disruption of intercellular energy production processes in the body. Particularly in the liver, fatty acid metabolism is interrupted, and cells become unable to clear harmful substances. This leads to the accumulation of toxic substances such as ammonia in the blood, fatty changes in the liver, and the formation of edema in the brain.

It is thought that the viral infection creates extra stress at the cellular level in the body, and aspirin further aggravates this process; in other words, both genetic predisposition and environmental factors may play a role in the onset of the syndrome.

How is Reye Syndrome Diagnosed?

The diagnosis of Reye syndrome is primarily established by combining clinical symptoms and laboratory findings. There is no specific test to make a definitive diagnosis. Therefore, the patient's medical history, particularly recent viral infections and medication use (especially aspirin), is carefully questioned. The main methods utilized in diagnosis include:

Blood tests: Significant elevations in liver enzymes (AST, ALT), low blood sugar (hypoglycemia), elevated blood ammonia levels, and clotting disorders may be detected.

Cerebrospinal fluid (CSF) analysis: This may be necessary to rule out other serious diseases such as bacterial meningitis.

Brain imaging: The degree of edema in the brain can be examined using magnetic resonance imaging (MRI) or computed tomography (CT).

Liver biopsy: Rarely, a small tissue sample may be taken from the liver and evaluated under a microscope.

During the diagnostic process, other diseases presenting similarly (such as poisonings, metabolic disorders, meningitis, encephalitis) must also be ruled out. Early diagnosis is one of the most critical factors determining the course of the disease.

How is Reye Syndrome Treated?

Reye syndrome is a condition requiring emergency intervention, and treatment must absolutely be performed under hospital conditions, preferably in an intensive care unit. There is no specific medication for the disease; the goal of treatment is to protect vital organ functions and prevent complications. The main treatment approaches for Reye syndrome are:

Supportive care: Fluid and electrolyte balance is established primarily. Fluids and medications are administered intravenously to clear toxic substances accumulated in the body.

Treatment aimed at reducing brain edema: The position of the head is adjusted, and respiratory support is provided if necessary. Medications that reduce brain edema may be used.

Control of blood sugar and ammonia levels: Glucose support is provided if hypoglycemia (low blood sugar) is present. Special medications and treatment protocols can be applied to lower ammonia levels.

Neurological support: In cases of loss of consciousness and seizures, the patient's airway security is ensured, and antiepileptic medications are administered if necessary.

The earlier treatment is initiated, the greater the chance of survival and the lower the risk of permanent damage. In delayed or unrecognized cases, however, the risk of severe brain damage and death is high.

Frequently Asked Questions

Reye syndrome is a condition particularly encountered in childhood and most frequently occurs in children between 4 and 12 years of age, though it is worth noting that this range does not have a strict boundary. Preschool and elementary school-aged children, especially when viral infections are prevalent, are in the risk group. The reason for this is that the immune system of children at this age has not yet fully matured, and viral infections contracted during this period are more common.

Reye syndrome can also develop in infants, meaning young children under 2 years of age. In this age group, the symptoms of the disease sometimes follow a different course, and making a diagnosis can be more difficult. Parents, in particular, should be more vigilant against symptoms such as vomiting, lethargy, and sudden changes in consciousness in newborns and infants. Reye syndrome has also been rarely reported in adolescents aged 13-16 approaching puberty. The frequency of the disease is quite low after these ages. Although Reye syndrome is rarely seen in adults, it can manifest with sudden changes in consciousness. The most important reasons for this are that the adult immune system is mature and the body's response to viral infections differs. The use of aspirin can severely increase the risk of Reye syndrome in children. Aspirin was widely used as a fever reducer and pain reliever across all age groups for years; however, since the 1970s, it has been realized that when aspirin is given to children experiencing viral infections such as influenza and chickenpox, some children develop a rapidly progressing Reye syndrome shortly thereafter. Examinations and case analyses have revealed a strong correlation between aspirin taken during or immediately after a viral infection in children and Reye syndrome because, during a viral infection, the body's metabolic balance is already strained and the liver's workload increases. Aspirin places an extra burden on the liver during this process. As a result, the liver's capacity to clear toxins decreases, and energy production at the cellular level is impaired. This leads to an increase in harmful substances such as ammonia in the blood and causes damage to the brain. In short, when aspirin is given to a child suffering from a viral illness, the groundwork is laid for Reye syndrome. If Reye syndrome is left untreated or diagnosed late, serious and sometimes permanent complications can develop in the body. The greatest danger of this disease is that it creates sudden and rapidly progressing edema (swelling) in the brain. Brain edema can lead to loss of consciousness, seizures, and advanced neurological damage. As a result, permanent losses in basic skills such as speaking, moving, and learning may occur in the child. Another important complication is liver failure. When the liver cannot perform its function, harmful substances in the blood accumulate, which also causes problems in the other organs of the body. Furthermore, as Reye syndrome progresses, the risk of impairments in the respiratory and circulatory systems, irregularities in heart rhythm, and the development of shock increases. All these complications can reach life-threatening proportions and result in death if not intervened in time. In some surviving patients, long-term rehabilitation and support are required due to permanent brain damage. Therefore, early diagnosis and treatment are of great importance in Reye syndrome.

Reye syndrome is a serious condition requiring early diagnosis and rapid intervention.

If you notice a sudden change in consciousness, persistent vomiting, or neurological symptoms in your child, it is vital that an expert evaluation is performed without wasting time.

At Hisar Hospital Intercontinental Department of Pediatrics, we provide fast and safe healthcare services in childhood emergencies with our experienced physician staff and advanced diagnostic technologies.

You can contact us for detailed information and appointments.