์ด์คํฅ์
**์ด์คํฅ์(Iohexol)**์ ์์ํ์์ ๋ฐฉ์ฌ์ ์์ ๊ฒ์ฌ ๋ฐ **์ฌ๊ตฌ์ฒด ์ฌ๊ณผ์จ(GFR)**์ ํ๊ฐํ๋ ์ ๋ฐํ ๋ง์ปค๋ก ๋๋ฆฌ ์ฌ์ฉ๋๋ ๋น์ด์จ์ฑ ์ ์ผํฌ์ ์กฐ์์ (LOCM)์ ๋๋ค. * **์์ ๊ฒ์ฌ**: ์ฒ์ ์กฐ์์ , ๋ฐฐ์ค์ฑ ์๋ก ์กฐ์์ , ํ๊ด ์กฐ์์ ๋ฐ ์์ฅ๊ด ๊ฒ์ฌ์์ ์ฐ์ํ ๋ฐฉ์ฌ์ ๋ถํฌ๊ณผ์ฑ์ ์ ๊ณตํฉ๋๋ค. * **์์ ์ฑ**: ๊ณผ๊ฑฐ์ ๊ณ ์ผํฌ์ ์ด์จ์ฑ ์กฐ์์ (์: ๋์ํธ๋ฆฌ์กฐ์์ดํธ)์ ๋น๊ตํ ๋ ์ด์คํฅ์์ ์ผํฌ์์ด ํ์ ํ ๋ฎ์ต๋๋ค. ์ด๋ก ์ธํด ํ์ญํ์ ๋ถ์์ฉ์ด ์ ๊ณ ๋ดํผ์ธํฌ ๋ฐ ์ ํ๊ตฌ ์์์ด ๊ฐ์ํ๋ฉฐ ์ฃผ์ฌ ์ ํต์ฆ์ด๋ ์์ด๊ฐ์ด ์ค์ด๋ญ๋๋ค. * **์ ์ฅ ๊ธฐ๋ฅ ๊ฒ์ฌ**: ์ ์ฅ์์ ์์ ๋กญ๊ฒ ์ฌ๊ณผ๋๋ฉฐ ๋ถ๋น๋๊ฑฐ๋ ์ฌํก์๋์ง ์๊ธฐ ๋๋ฌธ์ ๊ทธ ์ฒญ์์จ์ด ์ด๋๋ฆฐ๊ณผ ๋งค์ฐ ์ ์ฌํฉ๋๋ค. ํ์ฅ ๋ฐ ์๋ณ์์ ๋งค์ฐ ์์ ์ ์ด์ด์ ํ์ค ๋ง์ปค(BUN, ํฌ๋ ์ํฐ๋)๊ฐ ์ถฉ๋ถํ ๋ฏผ๊ฐํ์ง ์์ ๋ ์ด๊ธฐ ์ ์ฅ ์งํ์ ๋ฐ๊ฒฌํ๊ธฐ ์ํ ์ด์์ ์ด๊ณ ์ค์ฉ์ ์ด๋ฉฐ ๋น์ฉ ํจ์จ์ ์ธ ๋ง์ปค์ ๋๋ค.
์์ฉ ๊ธฐ์ : * **Radiographic Contrast**: Iohexol contains **organic iodine** atoms that absorb X-rays via the **photoelectric effect** โ increases the radiopacity of the fluid or structure it fills โ allows clear delineation of adjacent tissues on radiographs or CT scans. * **GFR Marker**: Iohexol has negligible protein binding (<1%) and is freely filtered by the **glomerulus** โ it is neither secreted nor reabsorbed by the renal tubules โ nearly 100% is excreted unchanged in the urine within 24 hours. By measuring the rate of plasma disappearance over time, clinicians can accurately calculate the **glomerular filtration rate (GFR)**.
๋๋ฌผ ์ข ๋ณ ์ฉ๋
- Estimate GFR (single sample method) ยท 90 mg iodine content/kg in non-azotemic animals and 45 mg iodine content/kg in azotemic animals ยท IV ยท Single dose ยท Samples drawn at 120 min to assess validity of single-sample method.
- Contrast agent for suspected GI perforation ยท 1:3 dilution of iohexol 240 at 10 mL/kg of body weight ยท PO ยท Single dose ยท Best administered via nasogastric/nasoesophageal tube.
- Contrast agent (GI abnormalities, transit time) ยท estimated crop volume of 25-30 mL/kg. Iohexol may be diluted 1:1 with water ยท PO ยท Single dose ยท Administered directly into the crop by gavage. Retrograde administration directly into the cloaca may help evaluate cloacal abnormalities. Preferred over barium if perforation is suspected.
- Estimate GFR (2-4 sample method) ยท 129-658 mg/kg ยท IV ยท Single dose ยท Given over a minute. Lower doses may result in plasma concentrations too low for accurate analysis.
- Estimate GFR (single sample method) ยท 90 mg iodine content/kg in non-azotemic animals and 45 mg iodine content/kg in azotemic animals ยท IV ยท Single dose ยท Samples drawn at 120 min to assess validity of single-sample method.
- Contrast agent for suspected GI perforation ยท 700-875 mg Iodine/kg, 10 mL/kg ยท PO ยท Single dose ยท Best administered via orogastric tube. Radiographs obtained immediately, then at 15, 30, and 60 minutes.
์ฉ๋์ ๋ฉดํ ์์ ์ ๋ฌธ๊ฐ๋ฅผ ์ํ ์์ ์ฐธ๊ณ ์๋ฃ์ ๋๋ค. ํญ์ ์ต์ ๋ผ๋ฒจ๊ณผ ๊ฐ๋ณ ํ์์ ๋ํด ํ์ธํ์ญ์์ค.
ํฌ์ฌ ๊ฒฝ๋ก
๊ธ๊ธฐ
- Prior hypersensitivity reaction to iohexol or iodine-containing products
์ด์๋ฐ์
- Hypersensitivity reactions (rare)
- Nephrotoxicity (slight risk)
- Pain or heat sensation at injection site (less common than with ionic agents)
์ฝ๋ฌผ ์ํธ์์ฉ
- Drugs that prolong QTc interval (e.g., amiodarone, cisapride, procainamide, quinidine, sotalol, dolasetron, moxifloxacin) ยท May cause additive prolongation of the QTc interval, though iohexol causes less prolongation than diatrizoate.
- Iodine Isotopes ยท May alter binding to thyroid tissue for up to two weeks, affecting certain thyroid treatments or scans.
- Phenothiazines ยท May increase the risk for lowering the seizure threshold, especially when iohexol is used intrathecally.
๋ชจ๋ํฐ๋ง
- Signs of hypersensitivity or anaphylaxis during and immediately after administration
- Renal function (if pre-existing impairment exists)
- Hydration status
๊ณผ์ฉ๋
Adverse effects of intravenous overdosage can be serious and life-threatening, primarily affecting the **pulmonary** and **cardiovascular systems**. * **Clinical Signs**: Cyanosis, bradycardia, acidosis, pulmonary hemorrhage, convulsions, coma, and cardiac arrest. * **Treatment**: Treatment is entirely supportive and symptomatic. Maintain airway, support ventilation, and manage cardiovascular collapse with appropriate fluids and vasopressors as needed.
VetSheet ์ฝ๋ฌผ ๋ ํผ๋ฐ์ค๋ ๋ฉดํ ์์ ์ ๋ฌธ๊ฐ๋ฅผ ์ํ ์์ ์์ฌ๊ฒฐ์ ๋ณด์กฐ ๋๊ตฌ์ด๋ฉฐ, ์ ๋ฌธ์ ํ๋จ์ด๋ ์ ์กฐ์ฌ์ ์ต์ ๋ผ๋ฒจ์ ๋์ ํ์ง ์์ต๋๋ค.