Which factor contributes to the formation of a pressure injury when a patient’s body slides downward to the foot of the bed?

Choice A rationale:

The dorsal gluteal site, also known as the dorsogluteal site, was once a common choice for intramuscular injections. However, it has fallen out of favor due to several concerns, including:

Risk of sciatic nerve injury: The sciatic nerve, the largest nerve in the body, runs deep within the gluteal region. Injections into the dorsal gluteal site have a higher risk of accidentally hitting this nerve, which can lead to pain, numbness, and weakness in the leg.

Difficulty in landmarking: Accurately locating the dorsal gluteal site can be challenging, especially in patients with excessive adipose tissue or those who are unable to position themselves properly. Incorrect injection placement can increase the risk of tissue damage and poor drug absorption.

Pain: The dorsal gluteal site is often more painful than other intramuscular injection sites, likely due to the presence of more nerve endings in the area.

Choice B rationale:

The deltoid muscle, located in the upper arm, is a common site for intramuscular injections, particularly for vaccines. However, it has limitations when it comes to administering larger volumes of medication:

Small muscle mass: The deltoid is a relatively small muscle, limiting the amount of medication that can be safely injected. It's generally recommended to inject no more than 1-2 mL of medication into the deltoid muscle.

Proximity to nerves and blood vessels: The deltoid muscle is located near the radial nerve and brachial artery. Improper injection technique could potentially injure these structures.

Choice C rationale:

The vastus lateralis muscle, located in the anterolateral aspect of the thigh, is considered the preferred site for intramuscular injections in adults when the volume of medication exceeds 2 mL. Here's why:

Large muscle mass: The vastus lateralis is a large, thick muscle, capable of accommodating larger volumes of medication (up to 5 mL).

Easy to access: The vastus lateralis is easily accessible and can be injected with the patient in a sitting or lying position.

Fewer nerves and blood vessels: The vastus lateralis has fewer major nerves and blood vessels compared to other injection sites, reducing the risk of injury.

Pain tolerance: Studies have shown that injections into the vastus lateralis are generally less painful than injections into the deltoid or gluteal muscles.

Choice D rationale:

The lateral piriformis muscle is not a recognized or recommended site for intramuscular injections. It's a deep muscle located within the pelvic region, making it difficult to access and posing a higher risk of injury to surrounding structures.

Choice B rationale:

Heart rate: During a stress response, the sympathetic nervous system is activated, leading to a release of hormones such as adrenaline and cortisol. These hormones increase heart rate, preparing the body for a "fight or flight" response. A heart rate of 132 beats per minute is significantly elevated compared to a normal resting heart rate of 60-100 beats per minute, suggesting a stress response.

Choice C rationale:

Pupil dilation: Pupil dilation is another physiological change associated with the activation of the sympathetic nervous system during stress. The dilation allows more light to enter the eyes, enhancing visual acuity and awareness of surroundings, which can be helpful in responding to potential threats.

Choice E rationale:

Difficulty sleeping: Stress can negatively impact sleep in several ways. It can cause racing thoughts, anxiety, and physical tension, making it difficult to fall asleep and stay asleep. Sleep disturbances are a common symptom of stress and can further exacerbate its effects.

Rationale for incorrect choices:

Choice A: Blood glucose level can be affected by stress, but a low blood glucose level of 36 mg/dL is more likely to be due to other causes such as hypoglycemia or insulin therapy. It's not a direct indicator of a stress response.

Choice D: Blood pressure can increase during stress, but a blood pressure of 104/56 mmHg is within the normal range and does not necessarily indicate a stress response.