Dose of I.V. adrenaline in term infant during neonatal resuscitation:
The core concept would involve understanding the correct dosage for a term infant. Adrenaline is used in cases where the infant isn't responding to initial resuscitation efforts. The correct dose is crucial because too little won't help, and too much could be harmful.
Now, the correct answer is likely 0.1 ml/kg of 1:10,000 concentration. This is a standard dose recommended by the American Academy of Pediatrics (AAP) and the Neonatal Resuscitation Program (NRP). The mechanism here is that adrenaline acts as a vasoconstrictor and inotropic agent, increasing systemic vascular resistance and cardiac output, which is essential in cases of severe bradycardia or asystole.
For the incorrect options, I need to think of common wrong concentrations or volumes. For example, 1:1000 concentration is more concentrated and used in adults, but in neonates, the dilution is higher. Also, higher volumes like 0.3 ml/kg would be excessive for a term infant. Another possible wrong option might be using a different route, like intramuscular, but the question specifies IV.
Clinical pearl: Remember that neonatal doses are different from adults. The NRP guidelines are key here. Adrenaline is typically given via IV or IO in neonates, not IM during resuscitation. The concentration and volume must be precise to avoid adverse effects.
Putting it all together, the correct answer is 0.1 ml/kg of 1:10,000 adrenaline. Let me structure the explanation accordingly, making sure each section is concise and covers all the necessary points without exceeding the character limit.
**Core Concept**
The question tests knowledge of **neonatal resuscitation protocols**, specifically **epinephrine dosing** for term infants. Adrenaline (epinephrine) is used in cardiac arrest to stimulate myocardial contractility and peripheral vasoconstriction, per guidelines from the Neonatal Resuscitation Program (NRP).
**Why the Correct Answer is Right**
The **correct dose is 0.1 ml/kg of 1:10,000 epinephrine** (0.01 mg/kg). This concentration is diluted to reduce peripheral vasoconstriction risk in neonates. Adrenaline acts via α- and β-adrenergic receptors, increasing coronary and cerebral perfusion pressure during resuscitation. It is administered intravenously (IV) or intraosseously (IO) in 3–5 mL/kg bolus volumes.
**Why Each Wrong Option is Incorrect**
**Option A:** 1:1000 concentration is **too potent** for neonates and reserved for adults; using it in infants risks severe hypertension and tissue ischemia.
**Option B:** 0.3 ml/kg of 1:10,000 exceeds the recommended dose, increasing arrhythmia and myocardial oxygen demand risks.
**Option D:** Intramuscular (IM) route