Neonatal jaundice occurs when unconjugated bilirubin builds up in the baby's blood faster than the immature liver can clear it. Because unconjugated bilirubin is fat-soluble, it can cross the blood-brain barrier and cause a devastating condition called kernicterus, leading to permanent neurological damage or cerebral palsy. Midwives in Nigerian health facilities must assess every jaundiced infant using the Kramer's rule dermal zones, while remembering that visual inspection alone is unreliable and should be confirmed with serum bilirubin levels whenever possible.
Phototherapy uses blue-green light spectrums, ideally between 430 to 490 nanometers, to alter toxic bilirubin molecules in the skin. Through photoisomerization and structural isomerization, the lipid-soluble unconjugated bilirubin is converted into water-soluble isomers like lumirubin, which the baby can easily excrete through urine and bile without needing liver conjugation.
The effectiveness of this treatment depends on three main factors: the energy output or irradiance of the light source, the distance between the baby and the bulbs, and the total surface area of skin exposed. Midwives must ensure the baby is positioned correctly under functional lamps with maximum skin exposure.
Setting up phototherapy requires meticulous attention to environmental safety and infant comfort. The incubator or cot must be placed at the manufacturer's recommended distance from the light source, usually about 45 centimeters, while avoiding overheating.
While phototherapy is generally safe, it carries specific side effects that require vigilant monitoring. Babies frequently develop bronze baby syndrome if phototherapy is used when direct bilirubin is elevated, turning the skin a grey-brown hue. Other common issues include loose green stools, skin rashes, and temporary feeding intolerance.
Midwives play a vital role in supporting maternal-infant bonding, which can be disrupted by the barrier of eye patches and isolation under the lights. Encourage mothers to express breast milk or feed the baby during brief scheduled interruptions when lights are turned off, reassuring them that short breaks for feeding and cuddling will not compromise treatment success.
When phototherapy fails to lower dangerous bilirubin levels or when severe hemolytic disease of the newborn causes rapid red blood cell destruction, an exchange transfusion becomes necessary. The primary goal is to rapidly remove circulating antibody-coated red cells, un-conjugated bilirubin, and maternal antibodies while replacing them with donor blood compatible with both mother and infant.
Preparation involves securing informed consent, ensuring cross-matched donor blood is fresh (less than five days old) and warmed to body temperature, and having emergency resuscitation equipment ready at the bedside. Midwives must check baseline vital signs and secure intravenous or umbilical catheter access with sterile technique.
An exchange transfusion is a precise procedure usually performed through the umbilical vein. The procedure follows a strict push-pull technique using calculated aliquot volumes based on the baby's weight, typically twice the total blood volume (two-volume exchange).
Following an exchange transfusion, the newborn requires intensive monitoring in a neonatal unit. Major complications include hypocalcemia and hyperkalemia due to additives in stored donor blood, as well as hypoglycemia, necrotizing enterocolitis, and infection.
Midwives must monitor vital signs every 15 minutes for the first hour, then hourly, watching for signs of bleeding, respiratory distress, or abnormal heart rhythms. Check blood glucose levels regularly because post-procedure hypoglycemia is a common risk. Document all fluid balances and report any signs of pallor, lethargy, or abdominal distension immediately.