์ฅ์ํ ์
์ฅ์ํ ์ ์ ์์ํ๋ถ์ ์ค๋ฐฉํต๊ณผ ์์ญ์ํต์์ ํฉ์ฑ๋์ด ๋ํ์์ฒด ํ์ฝ์ ์ ์ฅ๋๋ 9๊ฐ์ ์๋ฏธ๋ ธ์ฐ์ผ๋ก ์ด๋ฃจ์ด์ง ํฉํ์ด๋ ํธ๋ฅด๋ชฌ์ ๋๋ค. ์์ํ์์๋ ์ฃผ๋ก ์๊ถ์์ถ์ ๋ก ์ฌ์ฉ๋๋ฉฐ, ๋ถ๋ง ์ ์๊ถ ์์ถ ์ ๋ ๋ฐ ๊ฐํ, ์ฐํ ํ๋ฐ ์ ์ฒด ๋ฐ ์๊ถ๋ด๋ง์ผ ์น๋ฃ, ์๊ถ ํด์ถ ์ด์ง, ๋ฌด์ ์ฆ ์ ์ ์ฆ ๋ถ๋น ์ด์ง์ ์ํด ์ฌ์ฉ๋ฉ๋๋ค. **์์ ์์ :** * **๋ฏธ๋ ์ฉ๋(Mini-dosing) ์ ํธ:** ํ๋ ์์ ์ฐ๊ณผ์์๋ ๊ณผ๊ฑฐ์ ๊ณ ์ฉ๋ ๋์ '๋ฏธ๋ ์ฉ๋'(์: ๊ฐ์ ๊ฒฝ์ฐ ์ด 0.25-4 ๋จ์) ์ฌ์ฉ์ ๊ฐ๋ ฅํ ๊ถ์ฅํฉ๋๋ค. ๊ณ ์ฉ๋์ ๊ฐ์ง์ฑ์ด๊ณ ๋นํจ๊ณผ์ ์ธ ์๊ถ ์์ถ์ ์ ๋ฐํ์ฌ ํ๋ฐ ์๋ฐ์ ํตํ ํ์ ์ฐ์ ๊ณต๊ธ์ ์ ํดํ๊ณ ์๊ถ ํ์ด์ ์ํ์ ์ฆ๊ฐ์ํฌ ์ ์์ต๋๋ค. * **์นผ์ ์์กด์ฑ:** ์ฅ์ํ ์ ์ ํจ๋ฅ์ ์ธํฌ์ธ ์นผ์์ ํฌ๊ฒ ์์กดํฉ๋๋ค. ํฌ์ฌ ์ ์ ์นผ์ํ์ฆ์ด๋ ์ ํ๋น์ฆ์ ๊ต์ ํด์ผ ํฉ๋๋ค. ์นผ์์ ์์ถ์ '๊ฐ๋'๋ฅผ ์ฆ๊ฐ์ํค๋ ๋ฐ๋ฉด, ์ฅ์ํ ์ ์ '๋น๋'๋ฅผ ์ฆ๊ฐ์ํต๋๋ค. * **์๊ถ๊ฒฝ๋ถ ์ํ:** ์๊ถ๊ฒฝ๋ถ๊ฐ ๋ซํ ์๊ฑฐ๋ ๊ต์ ๋์ง ์์ ํ์์ฑ ๋์ฐ์ด ์๋ ๊ฒฝ์ฐ ์ฅ์ํ ์ ์ ํฌ์ฌํด์๋ ์ ๋ฉ๋๋ค.
์์ฉ ๊ธฐ์ : Oxytocin exerts its effects by binding to specific **G-protein coupled oxytocin receptors (OXTR)** on the cell membrane of uterine myofibrils and myoepithelial cells of the mammary gland. * **Uterine Contraction:** Binding to OXTR activates the **Gq/11 pathway** โ stimulates **Phospholipase C (PLC)** โ increases inositol triphosphate (**IP3**) and diacylglycerol (**DAG**) โ triggers the release of intracellular calcium from the sarcoplasmic reticulum. Calcium binds to calmodulin, activating **Myosin Light Chain Kinase (MLCK)**, leading to smooth muscle contraction. The threshold for oxytocin-induced contraction is significantly lowered late in pregnancy due to upregulation of oxytocin receptors by high estrogen levels. * **Milk Let-down:** Oxytocin stimulates the contraction of myoepithelial cells surrounding the mammary alveoli, forcing milk into the larger ducts and cisterns. It does *not* have galactopoietic (milk-producing) properties.
๋๋ฌผ ์ข ๋ณ ์ฉ๋
- For retained placenta in patients with uterine atony ยท 10-20 Units oxytocin. ยท IM/IV ยท Once ยท Limited value after 48 hours postpartum. Note for CAMELIDS (NW): 5-10 Units IM at 10-minute intervals for retained placenta (Adams 2008).
- For mild to moderate cases of acute post-partum metritis ยท 5-10 Units IM 3-4 times a day for 2-3 days ยท IM ยท TID to QID ยท 2-3 days
- For retained placenta in patients with uterine atony ยท 10-20 Units oxytocin. ยท IM/IV ยท Once ยท Limited value after 48 hours postpartum.
- For mild to moderate cases of acute post-partum metritis ยท 5-10 Units IM 3-4 times a day for 2-3 days ยท IM ยท TID to QID ยท 2-3 days
- To control post-extraction cervical and uterine bleeding after internal manipulations ยท 10-20 Units IV, may repeat SC in 2 hours ยท IV/SC ยท Once, may repeat in 2h
- To promote uterine involution after uterine prolapse manual reduction ยท 0.5-5 Units IM OR 5-10 Units (total dose) IM ยท IM ยท Once ยท Extrapolated from dog doses.
- To treat primary uterine inertia ยท 0.25 Units (total dose) SC or IM to a maximum dose of 4 Units per queen. Generally not given more frequently than hourly. ยท SC/IM ยท q1h ยท Given 15 minutes after calcium gluconate.
- For adjunctive treatment of metritis ยท 0.5-5 Units IM ยท IM ยท Once ยท May be used if birth occurred less than 24 hours prior.
ํฌ์ฌ ๊ฒฝ๋ก
๊ธ๊ธฐ
- Dystocia due to abnormal fetal presentation (unless corrected)
- Closed or unrelaxed cervix
- Known hypersensitivity to oxytocin
- Significant cephalopelvic disproportion
- Obstetrical emergencies where surgical intervention (C-section) is warranted
- Pregnancy (for nasally administered oxytocin)
์ด์๋ฐ์
- Uterine cramping and discomfort
- Tetanic uterine contractions (at high doses)
- Uterine rupture
- Fetal compromise or death (due to placental compression)
- Water intoxication (with prolonged high-dose infusions)
- Hypersensitivity reactions (more common with non-synthetic products)
์ฝ๋ฌผ ์ํธ์์ฉ
- Thiopental ยท May delay thiopental anesthesia (reported in humans; clinical significance in animals is not firmly established).
- Vasoconstrictors (Sympathomimetics) ยท Concurrent use post-partum may result in severe hypertension. Monitor closely.
๋ชจ๋ํฐ๋ง
- Uterine contractions (frequency, duration, and strength via tokodynamometry if available)
- Status of the cervix (must be dilated)
- Fetal monitoring (heart rate/distress)
- Maternal calcium and glucose levels
๊ณผ์ฉ๋
Effects of overdosage on the uterus depend on the stage of the uterus and the position of the fetus(es). * **Uterine Effects:** Hypertonic or tetanic contractions can occur, leading to tumultuous labor, uterine rupture, fetal injury, or fetal death due to compromised placental blood flow. * **Water Intoxication:** Can occur if large doses are infused for a long period, especially with large volumes of electrolyte-free IV fluids. * *Early signs:* Listlessness, depression. * *Severe signs:* Coma, seizures, death. * *Treatment:* Stop oxytocin therapy, restrict water access. Severe cases may require osmotic diuretics (mannitol, urea, dextrose) with or without furosemide.
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