Sarnat staging

Sarnat staging is a clinical staging system used to assess the severity of perinatal asphyxia in newborns. It was developed by Harold Sarnat and Marian Sarnat in 1976. The system is based on the clinical findings in the newborn during the first week of life, including neurological symptoms, the presence of seizures, and the duration of the abnormal clinical state.

Stages

The Sarnat staging system includes three stages:

• Stage I (Mild): Symptoms are usually present for less than 24 hours and may include hyperalertness, dilated pupils, and a normal or slightly increased muscle tone. The infant may also have a normal or slightly increased heart rate and blood pressure. Seizures are not typically present in this stage.

• Stage II (Moderate): Symptoms are usually present for 2-3 days and may include lethargy, constricted pupils, and increased muscle tone. The infant may also have a decreased heart rate and blood pressure. Seizures may be present in this stage.

• Stage III (Severe): Symptoms are usually present for more than 3 days and may include stupor or coma, small or nonreactive pupils, and decreased muscle tone. The infant may also have a significantly decreased heart rate and blood pressure. Seizures are typically present in this stage.

Use in Clinical Practice

The Sarnat staging system is widely used in clinical practice to assess the severity of perinatal asphyxia and to guide treatment decisions. It can also help predict long-term outcomes in infants with perinatal asphyxia.

See Also

• Perinatal asphyxia
• Neonatology
• Pediatrics