Adrenal congestion in perinatal hypoxia: Sonographic assessment and relationship with hypoxic ischemic encephalopathy.

BACKGROUND: During hypoxia, blood flow to the brain, myocardium, and adrenal glands is preserved or even increased to maintain homeostasis. Adrenal congestion occurs when venous return remains insufficient. Several different ultrasound measurements of adrenal glands in neonates have been reported in the literature. However, there is no data related on adrenal gland size in neonates with perinatal hypoxia.

AIMS: To evaluate the adrenal congestion using by ultrasound (US) measurements in perinatal hypoxia, and to reveal the relationship of adrenal congestion with hypoxic-ischemic encephalopathy (HIE) grades and magnetic resonance imaging (MRI) findings.

STUDY DESIGN: Prospective cohort study.

SUBJECTS: Infants with perinatal hypoxia who met therapeutic hypothermia criteria and were being cooled were included in the present study. The control group was established from healthy neonates admitted to our center during the recruitment.

OUTCOME MEASURES: The gland area was measured by tracing, and both the corpus and crura widths were measured.

RESULTS: We reported adrenal gland area data of 110 newborns with HIE and compared them with 56 normal neonates. The adrenal size was significantly higher in the HIE group than in the control group (p<0,01). The frequency of adrenal congestion was 72.7% based on the selected cut-off values. The adrenal gland measurements were increased in the patients with perinatal hypoxia than those of the controls.

CONCLUSIONS: In the systemic evaluation of newborns with perinatal hypoxia, additional care should be taken regarding adrenal congestion. The measurement of adrenal size with 2D US will help us to diagnose or confirm adrenal congestion and possible hemorrhagic changes. The morphological data and cut-off values given in our study will be useful for neonatologists and pediatric radiologists to evaluate the patient while managing perinatal hypoxia.