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Phytonadione

NCLEX Review Guide: Phytonadione (Vitamin K)

Pharmacology Overview

Mechanism of Action

Phytonadione (Vitamin K1) is essential for the synthesis of clotting factors II, VII, IX, and X in the liver
Acts as a cofactor for the enzyme that converts precursor proteins into active clotting factors
Reverses anticoagulant effects of warfarin by promoting normal blood clotting

Key Points

Fat-soluble vitamin requiring bile salts for absorption
Onset: IV 1-2 hours, IM/SubQ 6-8 hours, PO 6-10 hours

Maternity & Newborn Applications

Newborn Administration

Prophylactic dose: 0.5-1 mg IM within 1 hour of birth to prevent hemorrhagic disease of the newborn
Given in vastus lateralis muscle using 25-gauge needle
Newborns have sterile gut at birth, lacking vitamin K-producing bacteria

Clinical Scenario

A newborn is born at 39 weeks gestation. The nurse prepares to administer vitamin K injection. The correct procedure includes verifying the dose, using proper injection technique, and documenting administration time and site.

Verify physician order and newborn identity
Draw up 0.5-1 mg in tuberculin syringe
Clean injection site (vastus lateralis)
Insert needle at 90-degree angle
Inject slowly and withdraw needle
Apply gentle pressure, document administration

Maternal Considerations

Antepartum Use

May be given to mothers on anticoagulant therapy before delivery
Hemorrhagic disease prevention when maternal bleeding disorders are present
Monitor for maternal allergic reactions, especially with IV administration

Memory Aid: "K for Koagulation"

Klotting factors depend on vitamin K
Keep newborns safe from bleeding
Key injection site: vastus lateralis

Commonly Confused Points

Aspect	Phytonadione (Vitamin K1)	Menadione (Vitamin K3)
Safety	Safe for newborns	Contraindicated in newborns
Route	IM preferred for newborns	Oral only
Hemolysis Risk	Low risk	High risk in newborns

Critical Distinctions

Never give IV push rapidly - can cause severe reactions
IM route preferred over IV in newborns for safety
Different from other fat-soluble vitamins - water-soluble form exists

Nursing Considerations & Monitoring

Assessment & Monitoring

Monitor PT/INR levels when reversing warfarin effects
Assess for signs of bleeding: petechiae, bruising, prolonged bleeding from injection sites
Watch for anaphylaxis with IV administration - have emergency equipment ready

Quick Check

Question: A newborn develops bleeding from the umbilical cord site 2 days after birth. What should the nurse suspect?

Answer: Hemorrhagic disease of the newborn due to vitamin K deficiency - verify if prophylactic dose was given.

Study Tips & Memory Aids

NCLEX Success Tips

"K within 1 hour" - Remember timing for newborn administration
"Vastus lateralis" - Only acceptable IM site for newborns
"Fat-soluble but has water-soluble form" - Unique among fat-soluble vitamins
"Slow IV push" - Never give rapidly to prevent severe reactions

Common Pitfalls to Avoid

Don't confuse with other vitamin K forms (K2, K3)
Don't delay administration beyond 1 hour in newborns
Don't give IV push rapidly - always dilute and give slowly
Don't forget to assess for allergic reactions

Self-Assessment

☐ I can explain why newborns need vitamin K prophylaxis
☐ I know the correct IM injection site for newborns
☐ I understand the timing requirements for administration
☐ I can identify signs of vitamin K deficiency
☐ I know the difference between vitamin K forms
☐ I understand proper IV administration techniques

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