ATI NUR 130 Final Exam

Correct Answer: Débridement

Detailed Explanation of the Correct Answer:

Débridement refers to the removal of necrotic (dead), damaged, or infected tissue from a wound to promote healing and reduce the risk of infection. This process can be performed through several methods:

Mechanical débridement: Using physical force, such as wet-to-dry dressings or irrigation.

Surgical débridement: Removal of tissue using surgical instruments, performed by a healthcare provider.

Chemical débridement: Application of topical enzymatic agents to break down necrotic tissue.

Autolytic débridement: Using the body's own enzymes and moisture-retaining dressings (like hydrogel or hydrocolloid) to liquefy dead tissue.

Débridement is essential in wound care, especially for chronic wounds like pressure injuries and diabetic ulcers, as it clears the wound bed and facilitates the growth of healthy tissue.

Explanations for the Incorrect Options:

Hydrophilic means "water-attracting" and refers to substances or materials that absorb or mix well with water. It is not related to tissue removal.

Epidermopoiesis is the formation of new epidermal cells, a process involved in skin regeneration and healing, not in removing dead tissue.

Xerosis refers to abnormally dry skin, often caused by aging, environmental conditions, or underlying medical issues. It is not related to wound cleansing or tissue removal.

Summary:

The correct answer is débridement, as it specifically describes the process of removing necrotic tissue to aid in wound healing. The other options refer to unrelated skin properties or processes.

Correct Answer: Obscured full-thickness skin and tissue loss

Detailed Explanation of the Correct Answer:

An Unstageable Pressure Injury is defined as a full-thickness skin and tissue loss in which the extent of tissue damage is obscured by slough (yellow, tan, green, or brown tissue) or eschar (brown or black dead tissue). Until enough of the slough or eschar is removed to expose the base of the wound, the actual depth and stage cannot be determined, hence it is termed “unstageable.” These injuries require debridement for accurate staging and appropriate treatment.

Explanation of Incorrect Options:

Non-blanchable erythema of intact skin – This describes a Stage 1 pressure injury, which involves intact skin with localized redness that does not blanch when pressed. There is no skin loss, and thus it is not unstageable.

Full-thickness skin and tissue loss – This applies to Stage 4 pressure injuries, where muscle, tendon, or bone may be visible. It is not unstageable, because the wound depth is visible and can be clearly staged.

Partial-thickness skin loss with exposed dermis – This describes a Stage 2 pressure injury, which involves partial skin loss and exposure of the dermis, typically appearing as a shallow open ulcer or blister.

Summary:

An Unstageable Pressure Injury occurs when full-thickness tissue loss is present, but the true depth cannot be assessed due to slough or eschar covering the wound bed. It differs from other stages in that it is not immediately stageable without debridement or further assessment.

Correct Answer:

Inflammation

granulation

maturation

Explanation of Correct Answer:

Inflammation, granulation, and maturation

These are the three classic and sequential phases of wound healing:

Inflammation Phase

Begins immediately after injury and lasts a few days.

Purpose: Stop bleeding (hemostasis), remove debris, and prevent infection.Key components:

vasodilation, increased capillary permeability, and white blood cell infiltration.

Granulation Phase (also called Proliferative Phase)

Lasts several days to weeks depending on the wound.

Fibroblasts produce collagen; new blood vessels form (angiogenesis).

Granulation tissue fills the wound, and epithelial cells begin to resurface the wound.

Maturation Phase (also called Remodeling Phase)

Can last weeks to months.

Collagen fibers reorganize, strengthen, and increase tensile strength of the skin.

Scar tissue forms and remodels.

Explanation of Incorrect Options:

Infection, inflammation, and granulation

Infection is not a normal phase of healing—it's a complication.

Inflammation and granulation are correct, but this trio is incomplete and inaccurate.

Inflammation, pain, and necrosis

Pain and necrosis are symptoms or complications, not phases of healing.

Only inflammation is a correct phase.

Maturation, coagulation, and healing

Coagulation is a part of the hemostasis process within the inflammatory phase, not a standalone phase.

Healing is the entire process, not a single phase.

This list lacks the crucial granulation phase.

Summary:

Wound healing progresses through inflammation, granulation, and maturation phases. Each stage plays a specific and essential role in restoring skin integrity and function.

Correct Answer: Administering humidified oxygen through a tracheostomy collar

Explanation of the Correct Answer:

Administering humidified oxygen through a tracheostomy collar

This is the most effective intervention to promote airway clearance. A tracheostomy bypasses the natural humidification provided by the upper airway. Humidified oxygen helps keep respiratory secretions moist and thin, making them easier to clear through coughing or suctioning. This promotes effective airway clearance and reduces the risk of mucus plugging.

Why the Other Options Are Incorrect:

Suctioning respiratory secretions several times every hour

While suctioning is sometimes necessary, doing it several times every hour is excessive and can damage mucosal tissues, increase the risk of infection, and cause hypoxia. It should only be done as needed, based on the patient's assessment (e.g., audible secretions, visible mucus, or oxygen desaturation).

Instilling normal saline into the tracheostomy to thin secretions before suctioning

Routine saline instillation is not recommended due to a lack of evidence supporting its efficacy. It can cause coughing, bronchospasm, or lower airway contamination. It is only used in very specific situations and should not be standard practice.

Deflating the tracheostomy cuff before allowing the patient to cough up secretions

Deflating the cuff is not always appropriate and depends on the patient's ability to protect their airway. Cuff deflation should be done based on a physician’s or respiratory therapist’s guidance. Doing so incorrectly can lead to aspiration and decreased oxygenation.

Summary:

The best nursing intervention to promote airway clearance in a patient with a tracheostomy is administering humidified oxygen, which keeps secretions moist and easier to clear. Suctioning should be done only as needed, and routine saline instillation or cuff deflation may pose risks if not clinically indicated.

Correct Answer: Immediately wash the site with soap and running water, and seek guidance from the manager.

Detailed Explanation of the Correct Answer:

Immediately wash the site with soap and running water, and seek guidance from the manager

This is the correct and professionally appropriate response following potential exposure to a bloodborne pathogen. Even if the skin is intact, the exposure to blood is considered a potential occupational exposure, and infection prevention protocols must be followed. The nurse should:

Immediately wash the exposed area with soap and running water.

Report the exposure to a supervisor or nurse manager.

Follow the facility’s exposure control plan, which may include:

Documentation of the incident

Evaluation of the patient’s infectious status (e.g., HIV, Hepatitis B, Hepatitis C)

Baseline and follow-up lab tests for the nurse

Post-exposure prophylaxis if indicated

Prompt action reduces the risk of transmission and ensures appropriate follow-up care.

Detailed Explanation of Incorrect Options:

Obtain an alcohol swab, remove the blood with an alcohol swab, and continue care

Using an alcohol swab alone is not sufficient. It may help sanitize the skin superficially, but it does not replace proper hand hygiene or the need to report the incident. Additionally, alcohol may irritate the skin, and water and soap are recommended for decontamination of intact skin.

Do nothing; accidentally getting splashed with blood happens frequently and is part of the job

This is dangerous and incorrect. Bloodborne pathogens such as HIV, HBV, and HCV can be transmitted through occupational exposures, even when the skin appears intact. It is never acceptable to ignore such exposures.

Delay washing of the site until the nurse is finished providing care to the patient

Delaying the washing of the exposed site increases the duration of potential contact with infectious material. The exposed area should be cleansed immediately, and further care can be provided afterward or reassigned to another team member if necessary.

Summary:

The nurse must treat any exposure to blood as a serious event, even on intact skin. The immediate action is to wash the site with soap and water and report the incident to begin appropriate follow-up. Ignoring, delaying, or using inadequate cleaning methods increases risk to the healthcare worker.

Correct Answer: Elevated blood sugar levels

Detailed Explanation of the Correct Answer:

Elevated blood sugar levels are a primary contributing factor in the development of diabetic foot ulcers. Chronic hyperglycemia in individuals with diabetes can lead to neuropathy (nerve damage) and peripheral vascular disease. Neuropathy reduces sensation in the feet, making it harder for patients to detect injuries or pressure. At the same time, high blood sugar impairs immune response and wound healing, while poor circulation further reduces the ability to deliver nutrients and oxygen to the affected area. Together, these factors increase the risk for non-healing wounds and ulcers, especially on the feet where trauma or pressure often goes unnoticed.

Explanation of Incorrect Options:

Adequate peripheral circulation – Adequate circulation helps prevent diabetic foot ulcers by ensuring tissues receive proper oxygen and nutrients. It is not a contributing factor to ulcer formation but a protective factor.

Strong immune system – A strong immune system aids in fighting infection and promoting healing. Individuals with diabetes often have impaired immune responses, which contribute to ulcer development, so this option is incorrect.

Hyperbaric oxygen therapy – This is a treatment for diabetic foot ulcers, not a contributing factor. It increases oxygen supply to the tissues to accelerate healing in chronic wounds.

Summary:

The development of diabetic foot ulcers is most strongly linked to elevated blood sugar levels, which impair circulation, nerve function, and immune response. In contrast, adequate circulation, a strong immune system, and hyperbaric oxygen therapy help prevent or treat ulcers rather than contribute to their formation.

Correct Answer: Diabetes

Detailed Explanation of the Correct Answer:

Diabetes significantly increases the risk of pressure injury development due to its negative effects on circulation (perfusion) and skin nourishment. Over time, diabetes leads to microvascular and macrovascular damage, resulting in poor blood flow, especially to the extremities. This impairs oxygen and nutrient delivery to skin and subcutaneous tissues, which are critical for maintaining tissue integrity and healing.

In addition, diabetes is associated with neuropathy, which reduces sensory perception, and with impaired immune function, which slows wound healing. The combination of these factors—poor perfusion, impaired sensation, and delayed healing—greatly elevates the risk of pressure injury development in patients with diabetes.

Explanation of Incorrect Options:

Obesity – While obesity can increase pressure on certain body areas and lead to immobility or friction, it does not directly impair circulation and skin nourishment to the same degree as diabetes.

Anemia – Anemia reduces oxygen-carrying capacity of the blood, which can contribute to impaired healing. However, it does not typically cause the vascular damage seen in diabetes that directly reduces perfusion to skin and subcutaneous tissue.

Stroke – Stroke can cause immobility and impaired sensation, which increase pressure injury risk, but it is not primarily associated with circulatory compromise or reduced tissue nourishment unless compounded by other vascular conditions.

Summary:

Diabetes increases the risk of pressure injury development by reducing circulation and tissue nourishment through vascular damage and impaired healing capacity. Other conditions may contribute to risk via different mechanisms, but diabetes directly compromises skin perfusion and integrity, making it the most relevant answer in this context.

Correct Answer: Assessing changes in body temperature

Labeled and Detailed Explanation for the Correct Answer:

Assessing changes in body temperature:

This task requires critical thinking and clinical judgment, which are responsibilities of a Registered Nurse (RN). The RN must interpret whether changes in temperature are significant, evaluate trends, and determine if they indicate clinical deterioration, infection, or the effectiveness of treatment. This cannot be delegated to assistive personnel or licensed practical nurses without proper RN oversight.

Explanation of Why the Incorrect Options Are Wrong:

Using appropriate route and device:

This is a technical skill that can be delegated to a Licensed Practical Nurse (LPN) or Nursing Assistive Personnel (NAP), provided they are trained and competent. It does not require RN-level critical thinking.

Being aware of the usual values for the patient:

This is a basic part of patient care that any trained caregiver involved in vital signs should know. While important, it does not involve the interpretation that RNs are specifically trained for.

Obtaining temperature measurement at ordered frequency:

This is a routine data collection task that can be delegated to an LPN or NAP. It involves following an order and performing a task at a specified time, which does not require clinical judgment.

Summary:

The RN’s role involves assessment and interpretation of data, such as identifying and evaluating changes in body temperature that may reflect a change in condition. The correct answer is b. Assessing changes in body temperature.

Correct Answer:  Stroke volume × Heart rate

Detailed Explanation of the Correct Answer:

Stroke volume × Heart rate

Cardiac output (CO) is the amount of blood the heart pumps in one minute. The formula used to calculate cardiac output is:

Cardiac Output = Stroke Volume (SV) × Heart Rate (HR)

Stroke Volume (SV): The amount of blood ejected by the left ventricle in one contraction.

Heart Rate (HR): The number of heartbeats per minute.

For example, if the stroke volume is 70 mL and the heart rate is 75 beats per minute, the cardiac output would be: CO = 70 mL × 75 bpm = 5,250 mL/min or 5.25 L/min

This formula is the standard and most accurate way to assess overall heart performance in terms of volume delivery.

Why the Incorrect Options Are Wrong:

Myocardial contractility × Myocardial blood flow

This is not a standard formula for calculating cardiac output. While both myocardial contractility and blood flow affect cardiac function, they are not directly multiplied to determine CO.

Ventricular filling time/Diastolic filling time

This is not a recognized equation and does not reflect the components involved in cardiac output. Ventricular filling time and diastolic duration relate to cardiac function but do not calculate CO.

Preload/Afterload

Preload and afterload are factors that influence stroke volume and cardiac performance, but dividing these two values is not a formula for determining cardiac output.

Summary:

The most accurate and commonly used formula to calculate cardiac output is stroke volume multiplied by heart rate. This reflects the total blood pumped per minute and is essential in evaluating cardiac function in conditions like heart failure.