The nurse is caring for a patient admitted to the hospital with alterations in oxygenation.
The nurse understands that which of the following are common clinical manifestations in patients with alterations in oxygenation? Select all that apply.

Hypotension.

Cyanosis.

Hypoxia.

Bradycardia.

Moist mucous membranes.

Answer and Explanation

Correct Answer : B,C

Choice A rationale

Hypotension, while a possible consequence of severe oxygenation alterations, is not a primary or direct clinical manifestation. It often results from the systemic effects of prolonged hypoxemia, such as myocardial depression or severe acidosis leading to vasodilation. The initial physiological response to hypoxemia is typically tachycardia and hypertension as a compensatory mechanism to increase oxygen delivery, with hypotension occurring later as a sign of decompensation.

Choice B rationale

Cyanosis is a direct clinical manifestation resulting from a high concentration of deoxygenated hemoglobin in the blood. It becomes visible when the deoxygenated hemoglobin level exceeds 5 g/dL. Central cyanosis, seen in the lips and mucous membranes, indicates systemic hypoxemia, while peripheral cyanosis, in the extremities, suggests local impaired circulation or vasoconstriction. It is a key sign of inadequate oxygenation.

Choice C rationale

Hypoxia, defined as a deficiency in the amount of oxygen reaching the tissues, is a fundamental alteration in oxygenation. While not a visible sign, it is the underlying pathological condition that drives other clinical manifestations. The body's cells and organs require a constant supply of oxygen for aerobic metabolism. When this supply is insufficient, cellular function is impaired, leading to the clinical signs and symptoms.

Choice D rationale

Bradycardia is generally not a common initial manifestation of altered oxygenation. The body's primary compensatory mechanism for hypoxemia is to increase heart rate and cardiac output to enhance oxygen delivery, leading to tachycardia. Bradycardia may occur as a late, ominous sign of severe, prolonged, and decompensated hypoxia, particularly in infants and children, and often precedes cardiac arrest.

Choice E rationale

Moist mucous membranes are a sign of adequate hydration and perfusion. In patients with significant alterations in oxygenation, especially in conditions leading to mouth breathing or tachypnea, mucous membranes are more likely to become dry due to increased insensible water loss. Therefore, moist mucous membranes are not a common clinical manifestation of impaired oxygenation. *.

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Correct Answer is C

Explanation

Choice A rationale

Assessing the respiratory rate is a component of a full respiratory assessment but is not the most immediate priority. A life-threatening chest injury can cause a blocked or compromised airway, making respiratory rate an irrelevant measure if no air can get in or out. Ensuring a clear, patent airway is the absolute first step in the ABCs (airway, breathing, circulation) of emergency care, as without an open airway, no breathing can occur, regardless of the respiratory rate.

Choice B rationale

Administering opioid analgesics is important for pain management but is not a priority over life-sustaining interventions. Opioids can cause respiratory depression, which would worsen the patient's condition in the context of a life-threatening chest injury. The priority is to first secure the patient's airway and address immediate threats to life, such as establishing adequate oxygenation and ventilation, before addressing pain, which is secondary to survival.

Choice C rationale

Ensuring a patent airway is the most critical and immediate action according to the ABCs of trauma care. A life-threatening chest injury can compromise the airway through direct trauma, bleeding, or pneumothorax, leading to hypoxia and death within minutes. Establishing and maintaining a clear airway ensures the patient can be oxygenated and ventilated, a foundational step that must be secured before any other interventions can be effective in preserving life.

Choice D rationale

Starting two large bore IV lines is essential for fluid resuscitation and medication administration but is secondary to ensuring a patent airway. Without a secure airway, the patient will not survive long enough to benefit from IV fluids or medications. Airway management is the foundational step in emergency care, and it must be addressed before circulation can be effectively managed. The priority is always to ensure the patient can breathe first. ---.

A. Intubation and mechanical ventilation. B. Face mask with nonrebreather. C. Venturi mask at 35%. D. Oxygen cannula at 6 L/min.

Correct Answer is A

Explanation

Choice A rationale

A PaCO2 of 72 mmHg indicates severe hypercapnia and respiratory acidosis, which is a significant sign of impending or actual respiratory failure. The oxygen saturation of 84% signifies severe hypoxemia. Intubation and mechanical ventilation are necessary to provide positive pressure ventilation, which can override the patient's respiratory muscle fatigue, improve alveolar ventilation, and correct the life-threatening hypercapnia and hypoxemia. This approach provides precise control over tidal volume and respiratory rate.

Choice B rationale

A nonrebreather mask can deliver high concentrations of oxygen, typically 60-90%, and is suitable for patients with severe hypoxemia. However, it does not provide ventilatory support. Since this patient has severe hypercapnia with a PaCO2 of 72 mmHg, they are retaining carbon dioxide due to inadequate ventilation. A nonrebreather mask will not correct this ventilatory failure; it will only increase the inspired oxygen fraction.

Choice C rationale

A Venturi mask delivers a precise, fixed concentration of oxygen, such as 35%, which is useful for patients with chronic obstructive pulmonary disease (COPD) to avoid suppressing their hypoxic drive. However, a 35% concentration is insufficient for a patient with a saturation of 84% and severe hypoxemia. Furthermore, this method does not provide the ventilatory support needed to address the patient's severe hypercapnia and respiratory acidosis.

Choice D rationale

An oxygen cannula at 6 L/min provides a low-flow oxygen delivery, typically yielding an FiO2 of around 44% at this flow rate. This is an inappropriate choice for a patient with a saturation of 84% and severe hypoxemia, as it cannot deliver a high enough concentration of oxygen to significantly improve their oxygenation. It also fails to provide the ventilatory support needed to correct the severe hypercapnia. *.

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The nurse is caring for a patient admitted to the hospital with alterations in oxygenation. The nurse understands that which of the following are common clinical manifestations in patients with alterations in oxygenation? Select all that apply.

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Naxlex Comprehensive Predictor Exams

A patient has been brought to the emergency department with a life-threatening chest injury. What action by the nurse takes priority?

Correct Answer is C

Explanation

A patient diagnosed with pulmonary edema has a PaCO2 of 72 mmHg and an oxygen saturation of 84%. What method of oxygen delivery would best meet the needs of this patient?

Correct Answer is A

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The nurse is caring for a patient admitted to the hospital with alterations in oxygenation.
The nurse understands that which of the following are common clinical manifestations in patients with alterations in oxygenation? Select all that apply.