ํผํ ๋๋์จ (๋นํ๋ฏผ K1)
**ํผํ ๋๋์จ(๋นํ๋ฏผ K1)**์ ์ฒ์ฐ ๋นํ๋ฏผ K1๊ณผ ๋์ผํ ํฉ์ฑ ์ง์ฉ์ฑ ๋นํ๋ฏผ์ ๋๋ค. ์์ํ์์ ๋งค์ฐ ์ค์ํ ํด๋ ์ ๋ก, ์ฃผ๋ก **ํญ์๊ณ ์ฑ ์ด์์ **(์: ์ํ๋ฆฐ, ๋ธ๋ก๋ํ์ฟฐ, ๋ธ๋ก๋ง๋์ฌ๋ก ) ์ญ์ทจ๋ก ์ธํ ์๊ณ ์ฅ์ ๋ฅผ ์ญ์ ์ํค๋ ๋ฐ ์ฌ์ฉ๋ฉ๋๋ค. ์ฃผ์ ์์ ์ ์ฉ: * **ํญ์๊ณ ์ฑ ์ด์์ ์ค๋ :** ์น๋ฃ์ ํต์ฌ์ ๋๋ค. 2์ธ๋ ์ด์์ ๋ ๋ฐ๊ฐ๊ธฐ๊ฐ ๋งค์ฐ ๊ธธ์ด ์ข ์ข 3~4์ฃผ๊ฐ์ ์ง์์ ์ธ ๋นํ๋ฏผ K1 ๋ณด์ถฉ์ด ํ์ํฉ๋๋ค. * **์ค์ํธ ํด๋ก๋ฒ ์ค๋ :** ๋ฐ์ถ๋๋ฌผ์์ ๊ณฐํก์ด๊ฐ ํ ์ค์ํธ ํด๋ก๋ฒ๋ก ์ธํ ๋์ฟ ๋ง๋กค ์ค๋ ์ ์น๋ฃํ๋ ๋ฐ ์ฌ์ฉ๋ฉ๋๋ค. * **๊ฐ ์งํ:** ๋นํ๋ฏผ K์ ํก์๋ ์ด์ฉ์ด ์์๋ ๊ธ์ฑ ๊ฐ๋ถ์ ๋๋ ๋ด๋ ํ์ ์ ๋ณด์กฐ ์๋ฒ์ผ๋ก ์ฌ์ฉ๋ฉ๋๋ค. * **์คํํด๋ น์ด๋ฆฐ ์ค๋ :** ์ด ํญ์ฝ์๋์ ์ ๊ด๋ จ๋ ์ถํ์ฑ ์งํ์ ์ญ์ ์ํต๋๋ค. > **์์ ์์ :** ๋นํ๋ฏผ K1(ํผํ ๋๋์จ)์ ์ด๋ฌํ ์ค๋ ์ ํจ๊ณผ์ ์ด์ง๋ง, ๋นํ๋ฏผ K3(๋ฉ๋๋์จ)๋ ํจ๊ณผ๊ฐ ์๊ณ ๋ ์ฑ ์ํ์ด ๋ ๋์ต๋๋ค. ํผํ ๋๋์จ์ด ์๋ก์ด ์๊ณ ์ธ์๋ฅผ ํฉ์ฑํ๋ ๋ฐ๋ 6~12์๊ฐ์ด ๊ฑธ๋ฆฝ๋๋ค. ๋ฐ๋ผ์ ํ๋์ฑ ์ถํ์ด ์๋ ํ์๋ ํ์ฑ ์๊ณ ์ธ์๋ฅผ ๊ณต๊ธํ๊ธฐ ์ํด ์ฆ๊ฐ์ ์ธ ํ์ฅ ๋๋ ์ ํ ์ํ์ด ํ์ํฉ๋๋ค.
์์ฉ ๊ธฐ์ : Phytonadione is essential for the hepatic synthesis of **Vitamin K-dependent coagulation factors (Factors II, VII, IX, and X)**. * **Mechanism:** In the liver, inactive precursors of these factors require ฮณ-carboxylation of their glutamic acid residues to become functional. This carboxylation is catalyzed by the enzyme **ฮณ-glutamyl carboxylase**, which requires the reduced form of Vitamin K (Vitamin K hydroquinone) as a cofactor. * **The Vitamin K Cycle:** During carboxylation, Vitamin K is oxidized to Vitamin K epoxide. The enzyme **Vitamin K epoxide reductase (VKOR)** recycles the epoxide back to the active hydroquinone form. * **Anticoagulant Rodenticides โ** inhibit VKOR, depleting active Vitamin K and halting the production of functional clotting factors. Exogenous phytonadione bypasses this blockade, providing the necessary substrate to resume factor synthesis.
๋๋ฌผ ์ข ๋ณ ์ฉ๋
- Adjunctive therapy of acute liver failure ยท 1-5 mg/kg PO or SC q24h ยท PO, SC ยท q24h
- Anticoagulant rodenticide toxicity (exposed but non-bleeding) ยท 1.25-2.5 mg/kg PO twice daily with a fatty meal ยท PO ยท q12h ยท 2-4 weeks
- Anticoagulant rodenticide toxicity (bleeding patient) ยท 2.5 mg/kg PO twice daily with a fatty meal ยท PO ยท q12h ยท minimum of 4 weeks
- Anticoagulant rodenticide toxicity (symptomatic) ยท Loading dose of 2.5-5 mg/kg PO, then 3-5 mg/kg PO divided twice daily ยท PO ยท q12h ยท 14 days (1st gen) or at least 30 days (2nd gen/unknown)
- Known 1st generation coumarin toxicity or vitamin K1 deficiency ยท initially 2.5 mg/kg s.c. in several sites, then 1-2.5 mg/kg in divided doses p.o. ยท SC/PO ยท q8-12h ยท 5-7 days ยท Administer SC initially, followed by oral maintenance.
- Known 2nd generation coumarin (brodifacoum) toxicity ยท initially 5 mg/kg s.c. in several sites, then 2.5 mg/kg p.o. ยท SC/PO ยท q12h ยท 3 weeks ยท Restrict activity for 1 week post-treatment. Re-evaluate coagulation status 3 weeks after cessation of treatment.
- Known inandione (diphacinone) or unknown anticoagulant toxicity ยท initially 2.5-5 mg/kg s.c. over several sites. Then 2.5 mg/kg p.o. divided ยท SC/PO ยท q8-12h ยท 3-4 weeks ยท Re-evaluate coagulation status 2 days after stopping therapy. If PT is elevated, continue therapy for 2 additional weeks. If normal, rest for 1 week.
- Liver disease (pre-biopsy) ยท 0.5-1.0 mg/kg ยท SC ยท q12h ยท 1-2 days ยท Re-evaluate coagulation time before biopsy. If minimal improvement, fresh frozen plasma may be required.
ํฌ์ฌ ๊ฒฝ๋ก
๊ธ๊ธฐ
- Known hypersensitivity to phytonadione or its components
- Hypoprothrombinemia due to hepatocellular damage (Vitamin K cannot correct this if the liver cannot synthesize the protein precursors)
- Intravenous administration (relative contraindication due to anaphylaxis risk)
- Known hypersensitivity to phytomenadione
- Intramuscular administration in severely coagulopathic patients (risk of severe hematoma)
์ด์๋ฐ์
- Anaphylactoid reactions (especially following IV administration)
- Acute bleeding from the injection site (IM administration during early stages of treatment)
- Slow or poor absorption from SC or PO routes in hypovolemic patients
- Anaphylactic reactions (following IV administration)
- Haemolytic anaemia (in cats when overdosed)
- Anaphylaxis (primarily with IV administration)
- Injection site reactions (pain, swelling)
- Hematoma formation at injection sites (due to underlying coagulopathy)
์ฝ๋ฌผ ์ํธ์์ฉ
- Oral Antibiotics ยท May decrease the numbers of Vitamin K-producing bacteria in the gut, though chronic therapy usually has no significant effect on phytonadione absorption.
- Mineral Oil ยท Concomitant oral administration may reduce the GI absorption of oral Vitamin K. ยท moderate
- Warfarin (and other coumarin/indanedione anticoagulants) ยท Phytonadione directly antagonizes the anticoagulant effects of these drugs.
- Phenylbutazone, Aspirin, Chloramphenicol, Sulfonamides, Diazoxide, Allopurinol, Cimetidine, Metronidazole, Anabolic Steroids, Erythromycin, Ketoconazole, Propranolol, Thyroid Drugs ยท May prolong or enhance the effects of anticoagulants, thereby antagonizing some of the therapeutic effects of phytonadione.
- Aspirin ยท Antagonizes the effects of vitamin K ยท moderate
- Chloramphenicol ยท Antagonizes the effects of vitamin K ยท moderate
- Allopurinol ยท Antagonizes the effects of vitamin K ยท moderate
- Diazoxide ยท Antagonizes the effects of vitamin K ยท moderate
- Cimetidine ยท Antagonizes the effects of vitamin K ยท moderate
- Metronidazole ยท Antagonizes the effects of vitamin K ยท moderate
- Erythromycin ยท Antagonizes the effects of vitamin K ยท moderate
- Itraconazole ยท Antagonizes the effects of vitamin K ยท moderate
๋ชจ๋ํฐ๋ง
- Clinical efficacy (resolution or lack of hemorrhage, pale mucous membranes, weakness)
- One-stage prothrombin time (OSPT / PT)
- Proteins Induced by Vitamin K Absence (PIVKA)
- International Normalized Ratio (INR)
- Prothrombin time (PT) is the best method of monitoring therapy
- Prothrombin Time (PT) - typically normalizes within 12-24 hours of starting therapy
- Activated Partial Thromboplastin Time (aPTT)
- PIVKA (Proteins Induced by Vitamin K Absence or Antagonism)
- Clinical signs of bleeding (mucous membranes, heart rate, respiratory rate)
๊ณผ์ฉ๋
Phytonadione is relatively non-toxic. It is highly unlikely that toxic clinical signs would result after a single overdosage. However, inappropriate routes of administration (like rapid IV injection) can cause severe anaphylactoid reactions regardless of the dose.
VetSheet ์ฝ๋ฌผ ๋ ํผ๋ฐ์ค๋ ๋ฉดํ ์์ ์ ๋ฌธ๊ฐ๋ฅผ ์ํ ์์ ์์ฌ๊ฒฐ์ ๋ณด์กฐ ๋๊ตฌ์ด๋ฉฐ, ์ ๋ฌธ์ ํ๋จ์ด๋ ์ ์กฐ์ฌ์ ์ต์ ๋ผ๋ฒจ์ ๋์ ํ์ง ์์ต๋๋ค.