3 gr. = __________ mg (LABEL CORRECTLY)

Choice A rationale

Pulling the lobe up and back is the correct technique for administering ear drops to adults and children older than three years of age. This maneuver straightens the ear canal in older individuals due to the anatomical development and orientation of the Eustachian tube and external auditory meatus.

Choice B rationale

Instructing parents to hold the child upright for 10 minutes is an appropriate post-administration instruction to facilitate medication absorption and prevent spillage. However, this action is not part of the physical technique for correctly preparing the ear canal for drop instillation.

Choice C rationale

For children under 3 years old, the external auditory canal is straighter and angled differently than in adults. Pulling the pinna down and back straightens this shorter, more upwardly curved canal, allowing the medication to flow more effectively and reach the tympanic membrane for optimal absorption.

Choice D rationale

Massaging the tragus after instillation helps to distribute the medication throughout the ear canal and facilitate its passage deeper. However, massaging the tragus before administering the drops does not contribute to straightening the ear canal and is not a preparatory step for instillation.

Choice A rationale

The abdomen, specifically 2 inches from the umbilicus, is a common site for subcutaneous injections due to the presence of ample adipose tissue, which allows for slower absorption of medications like insulin or heparin. Intradermal injections require a site with a thin epidermis and minimal subcutaneous tissue to ensure the medication remains within the dermal layer, making the abdomen unsuitable.

Choice B rationale

The anterior thigh is a common site for intramuscular injections, particularly in infants, due to the large muscle mass (vastus lateralis). While it can be used for subcutaneous injections, its muscularity and varying skin thickness make it less ideal for the precise shallow angle required for an intradermal injection, where the goal is to deposit the medication into the dermis.

Choice C rationale

The posterior upper arm, specifically the triceps area, is frequently utilized for subcutaneous injections, such as insulin or certain vaccines, because it offers sufficient subcutaneous tissue. However, similar to the anterior thigh, its anatomical characteristics with thicker skin and subcutaneous fat layers make it less optimal for the very superficial intradermal injection technique.

Choice D rationale

The upper chest, particularly below the clavicle and above the breasts, is an appropriate site for intradermal injections. This area, along with the inner forearm and upper back, has a thin epidermis and less subcutaneous tissue, which facilitates the proper placement of the medication within the dermis, allowing for the formation of a visible wheal, a key indicator of a successful intradermal injection.