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🧮 Kalkil Dòz · Leson 5 sou 5 · 7 min

mcg/kg/min: Konvèsyon an Twa Etap

mcg/kg/min: The Three-Step Conversion

🫀 Dopamine a 5 mcg/kg/min pou yon pasyan 80 kg nan yon sak 400 mg nan 250 mL. Twa konvèsyon kanpe ant preskripsyon an ak reglage ponp lan, epi egzamen an fè ou fè tout twa.

🫀 Dopamine at 5 mcg/kg/min for an 80 kg client in a bag of 400 mg in 250 mL. Three conversions stand between the order and the pump setting, and the exam makes you do all three.

💡 Ide prensipal

Dòz pa minit, fwa 60 pou èdtan an, koresponn ak inite sak la, divize pa konsantrasyon an. Ekri chak etap ak inite li.

Dose per minute, times 60 for the hour, matched to the bag's units, divided by the concentration. Write every step with its unit.

🧠 Poukisa sa enpòtan

ETAP 1: jwenn dòz pa minit la: mcg/kg/min × kg. Kidonk 5 × 80 = 400 mcg/min. ETAP 2: konvèti an èdtan: × 60 = 24,000 mcg/hr, apre konvèti an mg si sak la an mg: ÷ 1,000 = 24 mg/hr. ETAP 3: jwenn konsantrasyon sak la: 400 mg ÷ 250 mL = 1.6 mg/mL. Apre mL/hr = 24 ÷ 1.6 = 15 mL/hr. Kesyon envès la bay debit ponp lan epi li mande dòz la: 15 mL/hr × 1.6 mg/mL = 24 mg/hr = 24,000 mcg/hr ÷ 60 = 400 mcg/min ÷ 80 kg = 5 mcg/kg/min. Inite yo se tout bagay: kenbe mcg ak mcg epi mg ak mg, epi ekri chak etap. Perfusion medikaman vazoaktif yo koule nan yon liy santral lè sa posib, sou yon ponp dedye, yo titre yo selon yon sib tankou presyon atèryèl mwayèn, san bolus oswa flush nan liy sa a.

STEP 1: find the dose per minute: mcg/kg/min × kg. 5 × 80 = 400 mcg/min. STEP 2: convert to the hour: × 60 = 24,000 mcg/hr, then convert to mg if the bag is in mg: ÷ 1,000 = 24 mg/hr. STEP 3: find the concentration of the bag: 400 mg ÷ 250 mL = 1.6 mg/mL. Then mL/hr = 24 ÷ 1.6 = 15 mL/hr. The reverse question gives the pump rate and asks for the dose: 15 mL/hr × 1.6 mg/mL = 24 mg/hr = 24,000 mcg/hr ÷ 60 = 400 mcg/min ÷ 80 kg = 5 mcg/kg/min. Units are everything: keep mcg with mcg and mg with mg, and write every step. Infusions of vasoactive drugs run through a central line when possible, on a dedicated pump, titrated to a target such as mean arterial pressure, with no boluses or flushes through that line.

🏥 Nan lavi reyèl

📝 Preskripsyon: norepinephrine 0.1 mcg/kg/min, pasyan 70 kg, sak 4 mg nan 250 mL. 0.1 × 70 = 7 mcg/min; × 60 = 420 mcg/hr = 0.42 mg/hr; sak la se 4 ÷ 250 = 0.016 mg/mL; 0.42 ÷ 0.016 = 26.25, kidonk 26.3 mL/hr. Enfimyè a ekri chak etap, ak inite li, sou yon fèy travay. San gade travay sa a, yon kòlèg kalkile debit la separeman apati preskripsyon an ak etikèt sak la. Tou de konpare rezilta yo anvan yo pwograme ponp lan. Perfusion vazoaktif yo resevwa doub verifyasyon endepandan sa a pou menm rezon insulin resevwa li: tou de se medikaman high-alert.

📝 Order: norepinephrine 0.1 mcg/kg/min, client 70 kg, bag 4 mg in 250 mL. 0.1 × 70 = 7 mcg/min; × 60 = 420 mcg/hr = 0.42 mg/hr; bag is 4 ÷ 250 = 0.016 mg/mL; 0.42 ÷ 0.016 = 26.25, so 26.3 mL/hr. The nurse writes each step, with its unit, on a worksheet. Without seeing that work, a colleague calculates the rate separately from the order and the bag label. The two compare results before the pump is programmed. Vasoactive drips get this independent double check for the same reason insulin does: both are high-alert medications.

📌 Sa pou retni

  • mcg/kg/min × kg = mcg/min; apre × 60 = mcg/hrmcg/kg/min × kg = mcg/min; × 60 = mcg/hr
  • Koresponn inite yo ak sak la, apre divize pa konsantrasyonMatch units to the bag, then divide by concentration
  • Perfusion high-alert yo resevwa yon doub verifyasyon endepandanHigh-alert infusions get an independent double check

📖 Tèm nan leson sa a

Vazopresè (norepinephrine, dopamine) (Vasopressors (norepinephrine, dopamine)): Konstrikte veso yo pou ogmante tansyon nan chòk pandan oswa apre likid (norepinephrine an premye nan chòk septik), titre pa ponp pou yon tansyon atèryèl mwayèn 65 oswa plis; yon liy santral prefere, men yo ka kòmanse pou yon ti tan nan yon gwo IV periférik pwoksimal.

✅ Teste tèt ou

Yo preskri Dopamine 400 mg nan 250 mL a 5 mcg/kg/min pou yon pasyan ki peze 60 kg, ki debit ponp lan ye?Dopamine 400 mg in 250 mL is ordered at 5 mcg/kg/min for a client who weighs 60 kg. What is the pump rate?
  1. 7.5 mL/hr
  2. 15 mL/hr
  3. 18 mL/hr
  4. 11.25 mL/hr

Repons: D · 11.25 mL/hr

5 × 60 = 300 mcg/min; × 60 = 18,000 mcg/hr = 18 mg/hr; konsantrasyon 1.6 mg/mL; 18 ÷ 1.6 = 11.25 mL/hr, 18 mL/hr se dòz pa èdtan an an miligram yo pran pou debit la, yo sote divizyon pa konsantrasyon 1.6 mg/mL la.

5 × 60 = 300 mcg/min; × 60 = 18,000 mcg/hr = 18 mg/hr; concentration 1.6 mg/mL; 18 ÷ 1.6 = 11.25 mL/hr. 18 mL/hr is the hourly dose in milligrams mistaken for the rate, skipping the division by the 1.6 mg/mL concentration.

Yon pasyan resevwa dobutamine 500 mg nan 250 mL a 12 mL/hr, pasyan an peze 100 kg, ki dòz yo ap bay la?A client receives dobutamine 500 mg in 250 mL at 12 mL/hr. The client weighs 100 kg. What dose is being delivered?
  1. 8 mcg/kg/min
  2. 4 mcg/kg/min
  3. 10 mcg/kg/min
  4. 2 mcg/kg/min

Repons: B · 4 mcg/kg/min

Konsantrasyon 2 mg/mL; 12 × 2 = 24 mg/hr = 24,000 mcg/hr ÷ 60 = 400 mcg/min ÷ 100 kg = 4 mcg/kg/min, 2 mcg/kg/min soti nan trete 12 mL/hr kòm 12 mg/hr, yo sote konsantrasyon 2 mg/mL la.

Concentration 2 mg/mL; 12 × 2 = 24 mg/hr = 24,000 mcg/hr ÷ 60 = 400 mcg/min ÷ 100 kg = 4 mcg/kg/min. 2 mcg/kg/min comes from treating 12 mL/hr as 12 mg/hr, skipping the 2 mg/mL concentration.

Ki pratik ki apwopriye pou yon perfusion vazopresè kontinyèl?Which practice is appropriate for a continuous vasopressor infusion?
  1. Pandye sak la pa gravite si ponp lan ap itilizeHang the bag by gravity if the pump is in use
  2. Bay medikaman IV push nan menm liy la pou ekonomize aksèGive IV push medications through the same line to save access
  3. Flush liy la rapidman apre chak titrasyonFlush the line rapidly after each titration
  4. Koule perfusion an sou yon ponp dedye epi titre li selon sib yo preskri aRun the infusion on a dedicated pump and titrate to the ordered target

Repons: D · Koule perfusion an sou yon ponp dedye epi titre li selon sib yo preskri a

Medikaman vazoaktif yo bezwen yon liy dedye ponp kontwole; bolus oswa flush nan liy sa a bay dòz ki pa te prevwa.

Vasoactive drugs need a dedicated, pump-controlled line; boluses or flushes through that line deliver unintended doses.

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