Which of the following best describes the Z-track intramuscular injection technique?
Insert needle at a 45° angle to minimize pain
Inject medication slowly into subcutaneous tissue to prevent leakage.
Displace the skin laterally before injection and release after to seal medication.
Use a tuberculin syringe for small volumes and precise dosing.
The Correct Answer is C
The Z-track method is a specialized intramuscular (IM) injection technique used to prevent medication leakage into subcutaneous tissues, which can lead to tissue irritation, staining, or discomfort. This technique is especially important when administering medications that are irritating or that can stain the skin, such as iron dextran. Nurses must understand the proper anatomical and procedural steps to ensure safe, effective delivery and minimize patient complications.
Rationale for correct answer:
C. Displace the skin laterally before injection and release after to seal medication:
This accurately describes the Z-track technique. Pulling the skin laterally creates a zigzag path that traps the medication in the muscle and prevents backflow into subcutaneous tissue, reducing irritation and promoting proper absorption.
Rationale for incorrect answers:
A. Insert needle at a 45° angle to minimize pain:
A 45° angle is used for subcutaneous injections, not intramuscular ones. IM injections, including the Z-track method, require a 90° angle to ensure the medication reaches deep muscle tissue, where it can be absorbed properly.
B. Inject medication slowly into subcutaneous tissue to prevent leakage:
The Z-track technique is not used for subcutaneous injections. Injecting into subcutaneous tissue is inappropriate for medications that require deep muscle absorption, and leakage is more likely to occur if the medication is not placed intramuscularly.
D. Use a tuberculin syringe for small volumes and precise dosing:
Tuberculin syringes are typically used for intradermal or very small subcutaneous injections, not for IM injections. The Z-track method requires a standard IM syringe and needle suitable for deep tissue penetration.
Take-home points:
- The Z-track technique is used to prevent medication leakage into subcutaneous tissue.
- Pulling the skin laterally before injection creates a sealed, zigzag path.
- Use a 90° angle with a proper IM needle—not a tuberculin syringe—for this method.
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Related Questions
Correct Answer is D
Explanation
Selecting an appropriate intramuscular (IM) injection site in infants is a critical component of safe medication administration. The choice is guided by the infant’s muscle development, risk of nerve or vascular injury, and the volume of medication to be administered. At 3 months of age, only specific sites are safe and anatomically accessible.
Rationale for correct answer:
4. Vastus lateralis:
The vastus lateralis muscle, located on the anterolateral aspect of the thigh, is the safest and most well-developed IM site in infants under 12 months. It can accommodate the volume typically used in pediatric injections and avoids critical nerves or blood vessels, making it the preferred site for IM injections in a 3-month-old.
Rationale for incorrect answer:
1. Deltoid:
The deltoid muscle is underdeveloped in infants and is not recommended for IM injections until the child is older (typically over 18 months), due to its small size and limited capacity for medication volume.
2. Ventrogluteal:
Although the ventrogluteal site is preferred in adults and older children because of its safety and distance from major nerves and vessels, it requires more muscle development than is present in a 3-month-old infant. It may be used in older infants if muscle mass is sufficient, but not at 3 months.
3. Dorsogluteal:
This site should be avoided in infants and children due to the proximity to the sciatic nerve and major blood vessels, which poses a high risk of nerve injury or vascular complications.
Take-home points:
- The vastus lateralis is the safest and most appropriate site for IM injections in infants under 12 months.
- Avoid the deltoid and dorsogluteal sites in young infants due to insufficient muscle and risk of nerve damage.
- Site selection for IM injections in infants is based on muscle development, safety, and medication volume.
Correct Answer is C
Explanation
Administering heparin subcutaneously requires specific techniques to minimize tissue trauma, ensure accurate delivery, and reduce the risk of hematoma or bleeding. Heparin is an anticoagulant, so care must be taken with needle selection, site choice, and injection angle. Nurses must follow evidence-based protocols to prevent complications.
Rationale for correct answer:
3. Use a 25G ⅝ inch needle at a 90° angle into the abdomen:
The preferred technique for administering subcutaneous heparin is to use a small-gauge (25-27G), ⅜–⅝ inch needle inserted at a 90° angle into the abdomen, at least 2 inches away from the umbilicus. The abdominal area has sufficient subcutaneous tissue and is ideal for slow, consistent absorption.
Rationale for incorrect answer:
A. Aspirate after inserting the needle to confirm placement:
Aspirating during a subcutaneous injection, especially with heparin, is not recommended because it may cause bruising and tissue damage. Heparin is a high-risk medication, and aspiration increases the chance of bleeding at the injection site.
B. Administer in the deltoid muscle:
Heparin is not given intramuscularly due to the risk of hematoma formation. The deltoid is an intramuscular site, making it inappropriate for subcutaneous administration of anticoagulants like heparin.
D. Shake the heparin vial to ensure the drug is evenly distributed:
Shaking heparin can damage the molecular structure of the drug and increase the risk of foaming or bubbles, which could alter dosage accuracy. Heparin should be gently rolled if mixing is necessary.
Take-home points:
- Heparin should be administered subcutaneously using a 25G ⅝ inch needle at a 90° angle into the abdomen.
- Aspiration is not recommended when giving heparin due to bleeding risk.
- Heparin must not be shaken; gentle handling preserves drug stability and potency.
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