https://file.aiquickdraw.com/mathbot/file/1726174847624sr3h65k0.jpg

To assist with the calculation based on the image, let me break down the details provided:

- **Drug Ordered**: Atropine sulfate 0.5 mg IV every 4-6 hours as needed for a 5-year-old child with bradyarrhythmia.
- **Patient's Weight**: 20 kg.
- **SDR (Safe Dose Range)**: 0.01 to 0.03 mg per kg to achieve a pulse rate greater than 60 beats per minute.
- **Maximum dose for child**: 500 mcg.
- **Drug Available**: Atropine sulfate injection 400 mcg/mL for SC, IM, or IV use.

We need to calculate the SDR for the child based on the weight and then calculate the amount to administer. 

### Step 1: Calculate the SDR
The SDR is given as **0.01 to 0.03 mg per kg**. Since the child's weight is 20 kg, the safe dose range is:

- **Low dose**: \( 0.01 \, \text{mg/kg} \times 20 \, \text{kg} = 0.2 \, \text{mg} \)
- **High dose**: \( 0.03 \, \text{mg/kg} \times 20 \, \text{kg} = 0.6 \, \text{mg} \)

So, the safe dose range for this child is 0.2 mg to 0.6 mg.

### Step 2: Convert the dose to mL based on the drug concentration
The concentration of the drug is **400 mcg/mL**. Since the doses are calculated in milligrams (mg), we need to convert to micrograms (mcg):
- **0.2 mg = 200 mcg**
- **0.6 mg = 600 mcg**

Now, we calculate the volume to administer:
- **Low dose (200 mcg)**: \( \frac{200 \, \text{mcg}}{400 \, \text{mcg/mL}} = 0.5 \, \text{mL} \)
- **High dose (600 mcg)**: \( \frac{600 \, \text{mcg}}{400 \, \text{mcg/mL}} = 1.5 \, \text{mL} \)

### Step 3: Compare the ordered dose
The ordered dose is **0.5 mg**, which is 500 mcg. The volume needed is:
- \( \frac{500 \, \text{mcg}}{400 \, \text{mcg/mL}} = 1.25 \, \text{mL} \)

Thus, the dose ordered is **1.25 mL**, which falls within the calculated safe dose range of 0.5 mL to 1.5 mL. This dose is safe.

Would you like further details or clarification on any of these calculations?

Here are 5 related questions for further understanding:
1. What is the role of atropine in treating bradyarrhythmia?
2. How does weight-based dosing ensure the safety of pediatric patients?
3. Why is it important to consider both the concentration and the volume of a drug in calculating the dose?
4. What are potential risks of exceeding the maximum dose for atropine in children?
5. How frequently can a drug like atropine be administered safely in a clinical setting?

**Tip**: Always double-check both the concentration of the drug and the units (mg/mcg) to ensure accurate dosing, especially in pediatrics.

If the dose range is safe, what is the amount to be administered for each dose? Ordered: Atropine sulfate 0.5 mg IV, every 4-6 hours as needed for a 5-year-old child with bradyarrhythmia. Patient's weight: 20 kg. Drug available: Atropine sulfate injection 400 mcg/mL for SC, IM, or IV use. Calculate the volume to administer for 1.25 mL.

Learn how to calculate the safe dose of Atropine sulfate for a 5-year-old child weighing 20 kg with bradyarrhythmia. The step-by-step guide includes calculating the safe dose range (SDR) and determining the correct volume based on the drug concentration of 400 mcg/mL. This is a crucial skill for medical professionals.

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