Vitamin K Deficiency Treatment in Neonates with Cystic Fibrosis, Feed Malabsorption, or Premature Birth
Premature infants born before 37 weeks who are failing to take or absorb feeds — including those with malabsorption conditions such as cystic fibrosis — form a distinct clinical group requiring a specific approach to Vitamin K deficiency prophylaxis that differs from standard newborn care.
Clinical Scenario
This protocol applies to neonates in one or more of the following situations:
- Premature birth (before 37 weeks of gestation)
- Failing to take or absorb feeds
- Complicated birth — breech, assisted, or caesarean delivery
- Unwell in the newborn period
- Liver disease (jaundice beyond two weeks; pale stools; dark urine)
- Bleeding or spontaneous bruising in early infancy
- Malabsorption disease — including cystic fibrosis — or hepatobiliary disease such as biliary atresia
- Born to a mother taking enzyme-inducing drugs that antagonise Vitamin K: anticonvulsants (carbamazepine, phenobarbital, or phenytoin), anticoagulant warfarin, or rifampicin for tuberculosis
Management Approach
Infants in this group must receive prophylactic Vitamin K. The route of administration and dosing strategy in this setting are not interchangeable with those used in healthy term newborns.
Full regimen details — including dosing, weight-based calculations, and timing — are in the complete structured protocol below.
References
- Premature (born before 37 weeks of pregnancy).
- Failing to take or absorb feeds.
- Complicated birth e.g. breech, assisted or caesarean birth.
- Babies who are unwell in the newborn period.
- Have liver disease (which may show itself as jaundice lasting more than two weeks, or have other symptoms e.g. pale stools and or dark urine).
- Have bleeding or spontaneous bruising in early infancy or who are ill from other causes.
- Babies with malabsorption diseases such as cystic fibrosis or hepatobiliary diseases such as biliary atresia.
- Mothers who have been taking certain enzyme-inducing drugs that antagonise vitamin K in the baby: Anticonvulsant drugs i.e. carbamazepine, phenobarbital, phenytoin; Anticoagulant therapy: Warfarin; Treatment for tuberculosis: rifampicin.
- NOTE: These babies must have prophylactic Vitamin K given parenterally (i.e. Not oral route).
- It should be administered as soon as practicable after birth, and definitely within 24 hours. This is a ONCE only dose.
- 1mg of Vitamin K Intramuscularly.
- This should be calculated using the following formula of 400micrograms/kg (maximum doses of 1mg) and is weight dependent.
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