Hydrocephalus is a condition characterized by an abnormal accumulation of cerebrospinal fluid (CSF) within the ventricular system of the brain. In newborns, this accumulation leads to ventricular dilation and progressive enlargement of the head, as the cranial sutures have not yet fused. Midwives practising in Nigeria frequently encounter congenital cases stemming from developmental malformations, genetic factors, or intrauterine infections like toxoplasmosis and cytomegalovirus.
The choroid plexus produces CSF continuously, which normally flows through the ventricles, bathes the brain and spinal cord, and is reabsorbed into the bloodstream. When this delicate balance is disrupted, fluid builds up. Understanding this pathway helps clinicians anticipate why the infant's brain tissue experiences abnormal pressure and why early detection during routine postnatal checks remains critical.
The underlying mechanism of hydrocephalus generally falls into two broad categories: communicating and non-communicating.
In many resource-limited settings across West Africa, untreated neonatal sepsis or meningitis serves as a major secondary driver of hydrocephalic changes in surviving infants.
Measuring the occipitofrontal circumference (OFC) is one of the simplest yet most powerful screening tools available to the midwife.
A single measurement only shows a snapshot in time. Consistently plotting serial measurements over days or weeks reveals abnormal upward velocity that far exceeds normal neonatal head growth curves.
As fluid collects and volume increases inside the rigid cranial vault, pressure rises, producing distinct physical signs that midwives must readily recognize during clinical assessments.
High-pitched, piercing cries, poor feeding, and lethargy often accompany these structural changes as the nervous system suffers from compression.
Conducting a thorough physical examination of the neonate goes beyond simply measuring head size. Midwives should evaluate overall neurological status, muscle tone, and feeding ability. Observe whether the baby has a weak suck reflex or vomits frequently after feeds, which indicates neurological distress.
Palpate the cranial sutures gently to assess width and mobility. Document the exact dimensions and tension of both the anterior and posterior fontanelles. Take accurate baseline vital signs, paying close attention to temperature stability and respiratory patterns, because brainstem compression can destabilize vital autonomic functions. Maintaining clear, detailed records ensures that any subtle upward trend in measurements or worsening neurological signs gets caught early.
Hydrocephalus is a surgical emergency that primary health centres cannot manage alone. Once a midwife identifies abnormal head growth velocity, a bulging fontanelle, or signs of raised intracranial pressure, immediate stabilization and urgent referral to a tertiary facility are required.
During preparation for transport, keep the baby warm, secure the airway, and handle the infant gently to avoid worsening intracranial stress. Avoid applying pressure to the fontanelles. At the tertiary level, neurosurgeons evaluate the infant using transfontanelle ultrasound or cranial CT scans. Definitive management usually involves surgical intervention, such as placing a ventriculoperitoneal (VP) shunt or performing endoscopic third ventriculostomy (ETV), to divert excess fluid and protect the developing brain from permanent injury.