Treatment of Vitamin K Deficiency in Newborns

Special Considerations

• Preterm infants on parenteral nutrition should receive 10 μg/kg/day of vitamin K 1, 2, 3

Monitoring

• Classical coagulation tests (PT, PTT) can be used in low-risk infants for indirect evaluation of vitamin K status, but are not specific to vitamin K deficiency 1, 2
• Undercarboxylated Serum Vitamin K-Dependent Proteins (PIVKA-II) are a more useful biomarker of subclinical vitamin K deficiency for at-risk patient groups and should be used when locally available 1, 2

Risk Factors for Vitamin K Deficiency

• Exclusively breastfed infants (breast milk contains low levels of vitamin K) 4
• Infants whose mothers have taken medications that interfere with vitamin K metabolism (anticonvulsants, anticoagulants, antituberculosis drugs) 1
• Infants with underlying diseases such as cystic fibrosis, alpha-1-antitrypsin deficiency, or cholestasis 1

Vitamin K Administration in Newborns

Rationale and Efficacy

• Newborns have physiologically decreased plasma levels of vitamin K-dependent coagulation factors (factors II, VII, IX, and X) compared to adults, making them vulnerable to bleeding disorders, according to the American College of Chest Physicians 5
• Vitamin K1 (phylloquinone) is considered safe with no known adverse effects of supplementation, as stated by the Clinical Nutrition society 6

Breastfeeding Considerations

• Breast milk contains low concentrations of vitamin K, making exclusively breastfed infants particularly susceptible to vitamin K deficiency, as noted by the American College of Chest Physicians 5

Vitamin K Administration in Neonates

Monitoring Considerations

• Routine monitoring of vitamin K concentrations is not recommended 7
• PIVKA-II (undercarboxylated vitamin K-dependent proteins) is a more useful biomarker for at-risk patients when locally available, according to the Clinical Nutrition guideline 7
• A prompt response (shortening of prothrombin time within 2-4 hours) following vitamin K administration is diagnostic of VKDB, as stated by the American Academy of Pediatrics 7

Vitamin K Administration in Newborns

Introduction to Vitamin K Prophylaxis

• The American Academy of Pediatrics and other guideline societies recommend vitamin K prophylaxis for all newborns to prevent life-threatening bleeding, with the route of administration being a topic of controversy 8, 9, 10

Recommended Administration Routes

• The European Society for Pediatric Gastroenterology, Hepatology and Nutrition (ESPGHAN) recommends oral vitamin K administration as 3 doses of 2 mg at birth, 4-6 days, and 4-6 weeks, or 2 mg at birth followed by weekly 1 mg doses for 3 months, although this is less effective than intramuscular administration 8, 9, 10