Review Practice Exercise 2

Respiratory Failure > Adult Health/Med Surg

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Practice Exercise 2

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Total Questions : 5

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Question 1:

The nurse is reviewing the results of a client's ventilation perfusion lung scan that demonstrates a mismatch ratio greater than 1. Which of the following conditions should the nurse suspect is occurring?

A. Pain. B. Atelectasis. C. Pulmonary embolus. D. Ventricular septal defect.

Answer and Explanation

Choice A:

Severe localized pain typically induces rapid, shallow breathing patterns that lead to generalized hypoventilation or hyperventilation rather than a primary vascular mismatch. It can eventually lead to atelectasis over time, but it does not cause an immediate vascular occlusion or a localized ventilation-perfusion ratio greater than 1. Pain modifies global respiratory drive and volume rather than obstructing blood flow.

Choice B:

Alveolar collapse causes blood to flow through pulmonary capillaries that pass by completely unventilated air sacs. This structural collapse reduces regional ventilation while maintaining blood flow, which decreases the localized ventilation-perfusion ratio to a value less than 1 or zero, causing an intrapulmonary shunt. It represents a ventilation failure rather than a primary perfusion blockage.

Choice C:

A thromboembolism physically occludes the pulmonary arterial vasculature, completely halting downstream capillary blood flow to the alveoli. Because ventilation to these affected air sacs continues normally, the ventilation-perfusion ratio increases significantly, matching the definition of a perfusion defect. This localized mismatch generates dead space ventilation, as the inspired oxygen cannot be absorbed by the blocked circulatory system.

Choice D:

A structural opening in the ventricular septum causes blood to shift directly between the cardiac chambers, bypassing normal systemic or pulmonary pressures. This structural cardiac anomaly represents an anatomic shunt where desaturated blood mixes directly into the systemic circulation. It does not cause a localized, isolated obstruction of airflow or blood flow within the pulmonary capillary bed itself.

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Question 2:

The nurse is assessing the arterial blood gas results of a client with chronic lung disease. Which of the following findings would most likely indicate the onset of acute respiratory failure?

A. PaO₂ 52 mm Hg, PaCO₂ 56 mm Hg, pH 7.4. B. PaO₂ 46 mm Hg, PaCO₂ 52 mm Hg, pH 7.36. C. PaO₂ 48 mm Hg, PaCO₂ 54 mm Hg, pH 7.38. D. PaO₂ 50 mm Hg, PaCO₂ 54 mm Hg, pH 7.28.

Answer and Explanation

Choice A:

A pH of 7.4 represents a fully compensated acid-base balance. The compensated respiratory acidosis indicates that the elevated carbon dioxide and decreased oxygenation are stable, long-standing chronic findings rather than an acute failure event. The kidneys have had sufficient time to retain bicarbonate over several days to normalize the systemic pH levels.

Choice B:

A pH of 7.36 falls completely within the normal physiological range. While the oxygen tension is low and carbon dioxide is elevated, this fully compensated state is typical for a patient with advanced chronic obstructive pulmonary disease. The absence of a significant acidemia indicates that this is the client's stable, functional baseline rather than an acute clinical deterioration.

Choice C:

A pH of 7.38 shows that the body has completely balanced the respiratory acid load. This finding represents a stable chronic respiratory insufficiency where the metabolic system has successfully counteracted the elevated carbon dioxide. Because the pH remains closely guarded around the physiological midpoint, there is no clinical indication of a new or acute ventilatory collapse.

Choice D:

A significant drop in pH to 7.28 indicates acute decompensation. The presence of uncompensated respiratory acidosis proves that the carbon dioxide elevation is acute or acutely worsening, which overwhelms the slow-acting renal bicarbonate buffers. This rapid acid-base shift confirms that the respiratory system can no longer maintain basic physiological gas clearance, separating it from stable baseline metrics.

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Question 3:

The nurse is admitting a client to the intensive care unit with hypercapnic respiratory failure. Which of the following manifestations should the nurse expect to assess in this client? Select all that apply

A. Cyanosis. B. Metabolic acidosis. C. Morning headache. D. Respiratory acidosis. E. Use of tripod position. F. Rapid, shallow respirations.

Answer and Explanation

Choice A:

Cyanosis is a late sign primarily associated with severe hypoxemia rather than hypercapnia itself. It reflects an absolute concentration of deoxygenated hemoglobin in capillary blood, making it a classic manifestation of an oxygenation failure. Hypercapnia can exist for a long period without showing visible bluish skin changes.

Choice B:

Hypercapnia directly causes a respiratory acid-base derangement rather than a metabolic one. A metabolic acidosis would be driven by a primary bicarbonate deficit or an accumulation of fixed organic acids like lactate. In hypercapnic states, the kidneys eventually retain bicarbonate over days to compensate, moving the metabolic balance in the opposite direction.

Choice C:

Carbon dioxide retention causes significant nocturnal cerebral vasodilation and increased intracranial pressure. This physiological mechanism leads to a classic morning headache as carbon dioxide accumulates further during sleep due to relative hypovenilation. It is a key diagnostic indicator of chronic or worsening hypercapnia.

Choice D:

Accumulation of carbon dioxide results in excess carbonic acid formation. This biochemical shift produces an immediate respiratory acidosis as hydrogen ions increase, dropping the arterial pH below 7.35. The respiratory system fails to clear the acid load, overwhelming immediate chemical blood buffers.

Choice E:

The client maximizes the expansion of thoracic volumes by leaning forward with hands on the knees. This specific tripod position optimizes the mechanical advantage of accessory neck and chest muscles to enhance chest wall excursion. It indicates severe ventilatory pump distress and an increased work of breathing.

Choice F:

The body attempts to compensate for a failing ventilatory pump by altering the respiratory pattern. Rapid, shallow respirations occur because the ventilatory drive is altered or the respiratory muscles are too fatigued to maintain normal tidal volumes. This pattern worsens dead space ventilation and traps more carbon dioxide.Rationale for incorrect answers

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Question 4:

The nurse is performing a clinical assessment on a client at risk for respiratory deterioration. Which of the following findings should cause the nurse to suspect the early onset of hypoxemia?

A. Restlessness. B. Hypotension. C. Central cyanosis. D. Cardiac dysrhythmias.

Answer and Explanation

Choice A:

Increased sympathetic tone from initial oxygen depletion causes cerebral hypoxia and agitation. This clinical response makes restlessness and anxiety the earliest, most sensitive neurobehavioral indicators of an impending oxygenation failure. Identifying this subtle behavioral shift allows for rapid intervention before more severe, life-threatening physiological collapse develops.

Choice B:

Low blood pressure represents a late, decompensated finding rather than an early indicator. Early sympathetic stimulation causes vasoconstriction and transient mild hypertension rather than a drop in systemic pressure. A sudden presentation of hypotension indicates that compensatory cardiovascular mechanisms have completely failed due to prolonged myocardial hypoxia.

Choice C:

A bluish discoloration of the mucous membranes is a late, unreliable sign of severe deoxygenation. Central cyanosis only becomes visible when there is an absolute concentration of at least 5 g/dL of unoxygenated hemoglobin in the blood. Relying on cyanosis as an early indicator is clinically dangerous because tissue hypoxia occurs long before skin color changes.

Choice D:

Altered electrical conduction in the myocardium indicates advanced cellular oxygen deprivation. Cardiac dysrhythmias develop as a late consequence when prolonged myocardial hypoxemia disrupts the cellular sodium-potassium pump and alters cardiac action potentials. Early hypoxemia causes a simple sinus tachycardia as the heart attempts to increase cardiac output.

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Question 5:

The nurse is reviewing the health records of five clients. Which of the following clients are at risk for developing acute respiratory distress syndrome (ARDS)? Select all that apply

A. A client who experienced a near-drowning incident. B. A client following coronary artery bypass graft surgery. C. A client who has a hemoglobin of 15.1 mg/dL. D. A client who has dysphagia. E. A client who experienced a drug overdose.

Answer and Explanation

Choice A:

Submersion in water causes a severe direct pulmonary insult that destroys alveolar architecture. The liquid aspiration damages pulmonary surfactant and induces a profound localized inflammatory response, which leads rapidly to fluid accumulation and widespread alveolar collapse characteristic of early-stage syndrome development.

Choice B:

Major cardiopulmonary bypass surgery triggers a systemic inflammatory response syndrome due to blood contact with foreign circuit surfaces. This inflammatory cascade activates circulating neutrophils that migrate into the pulmonary vasculature, damaging the endothelial lining and predisposing the client to post-surgical lung injury.

Choice C:

A hemoglobin level of 15.1 g/dL falls entirely within the normal physiological range for an adult client. This standard lab value indicates an adequate oxygen-carrying capacity of the blood without reflecting any underlying systemic inflammation or direct pulmonary epithelial trauma that would initiate a cascade toward acute tissue damage.

Choice D:

Impaired swallowing mechanisms create a high risk for the aspiration of gastric contents into the airways. The highly acidic gastric secretions cause an intense, direct chemical pneumonitis that destroys epithelial cells, rapidly escalating into diffuse alveolar damage and severe fluid shifting.

Choice E:

A severe drug toxicity event can induce respiratory depression or direct alveolar endothelial damage depending on the toxic agent. This central nervous system depression results in profound hypoventilation and increases the risk of silent aspiration, which independently incites a massive inflammatory pulmonary cascade.

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