The MD orders 1 L of LR to infuse at 150 mL/h for a post-op patient.

The tubing drop factor is 10gtts/mL. Calculate the flow rate in drops per minute.

(ROUND TO WHOLE NUMBER, LABEL CORRECTLY TO RECEIVE CREDIT)

Choice A rationale

A 10-15 degree angle is used for intradermal injections, where the medication is deposited just beneath the epidermis, creating a bleb or wheal. This shallow angle ensures the medication remains within the superficial layers of the skin for diagnostic purposes like allergy testing.

Choice B rationale

Intramuscular injections are administered at a 90-degree angle to ensure the needle penetrates deeply into the muscle tissue, bypassing the subcutaneous layer. This angle facilitates rapid absorption into the well-vascularized muscle and minimizes the risk of medication leakage into the subcutaneous tissue or irritation.

Choice C rationale

A 45-degree angle is typically used for subcutaneous injections, where the medication is deposited into the adipose tissue beneath the dermis. This angle is chosen to avoid injecting into muscle while still reaching the subcutaneous layer for systemic absorption.

Choice D rationale

A 60-degree angle is not a standard injection angle for common parenteral routes. The primary angles used for injections are 10-15 degrees (intradermal), 45 degrees (subcutaneous), and 90 degrees (intramuscular). Deviating from standard angles can compromise medication delivery and patient safety.

Step 1 is to locate the medication label. It is stated that Label #4 contains SoluMedrol.

Step 2 is to identify the concentration of SoluMedrol on Label #4. Assuming Label #4 indicates SoluMedrol 125 mg/2 mL (This is a common concentration; specific label details are not provided in the prompt, so a typical concentration is assumed for calculation purposes).

Step 3 is to calculate the volume to be administered. Volume (mL) = (Ordered dose ÷ Available concentration). Volume (mL) = (75 mg ÷ 125 mg/2 mL). Volume (mL) = (75 mg ÷ 125 mg) × 2 mL. Volume (mL) = 0.6 × 2 mL. Volume (mL) = 1.2 mL. The nurse will administer 1.2 mL.