Which clinical manifestation is most reflective of an early response to hypoxia?
Restlessness
Cyanosis
Apnea
Bradycardia
The Correct Answer is A
Choice A Reason:
Restlessness is often one of the earliest signs of hypoxia. When the body experiences low oxygen levels, the brain is one of the first organs to be affected. This can lead to symptoms such as anxiety, agitation, and restlessness as the brain struggles to function properly without adequate oxygen. These symptoms occur because the body is trying to compensate for the lack of oxygen by increasing respiratory and heart rates, which can make a person feel uneasy or restless.
Choice B Reason:
Cyanosis refers to a bluish discoloration of the skin and mucous membranes due to low oxygen levels in the blood. While cyanosis is a significant indicator of hypoxia, it is typically a later sign. By the time cyanosis is visible, hypoxia has usually been present for some time, and oxygen levels have been critically low. Therefore, it is not the earliest clinical manifestation of hypoxia.
Choice C Reason:
Apnea is the absence of breathing. This is a severe and late sign of hypoxia. When a person stops breathing, it indicates that the body has been deprived of oxygen for an extended period, leading to critical conditions. Apnea is a medical emergency and requires immediate intervention, but it is not an early sign of hypoxia.
Choice D Reason:
Bradycardia is a slower than normal heart rate. Like apnea, bradycardia is a late sign of hypoxia. Initially, the body responds to low oxygen levels by increasing the heart rate (tachycardia) to pump more oxygenated blood to tissues. Bradycardia occurs when the body can no longer compensate, and the heart rate slows down, indicating severe hypoxia and impending failure of the cardiovascular system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A Reason:
“Delivers a low concentration of oxygen” is incorrect because a nasal cannula can deliver varying concentrations of oxygen depending on the flow rate set by the healthcare provider. The concentration can range from low to moderate, typically between 24% to 44%.
Choice B Reason:
“Delivers a constant rate of oxygen” is partially correct but not entirely accurate. While the flow rate can be constant, the key aspect is the specific concentration of oxygen delivered, which is more relevant to the client’s understanding.
Choice C Reason:
“Delivers a high concentration of oxygen” is incorrect because nasal cannulas are generally used for low to moderate oxygen delivery. High concentrations of oxygen are typically delivered through other devices like non-rebreather masks or high-flow nasal cannulas.
Choice D Reason:
“Delivers a constant flow of a specific concentration of oxygen” is correct. This explanation accurately describes how a nasal cannula works. It provides a continuous flow of oxygen at a specific concentration, which is adjusted based on the client’s needs and the healthcare provider’s prescription.
Correct Answer is B
Explanation
Choice A Reason:
Securing the oxygen tubing to the bed sheet near the client’s head is not recommended because it can lead to accidental dislodgement of the tubing, which can interrupt the oxygen supply. Additionally, this practice does not address the potential for nasal dryness and irritation that can occur with oxygen therapy. Properly securing the tubing should involve ensuring it is comfortably positioned and not at risk of being pulled or dislodged.
Choice B Reason:
Attaching a humidifier bottle to the base of the flow meter is the correct action because it helps to add moisture to the oxygen being delivered to the client. Oxygen therapy, especially at higher flow rates like 5 L/min, can dry out the nasal passages and mucous membranes, leading to discomfort and potential complications. The humidifier bottle ensures that the oxygen is humidified, which helps to prevent dryness and irritation, making the therapy more comfortable and effective for the client.
Choice C Reason:
Applying petroleum jelly to the nares is not recommended because petroleum-based products can be flammable and pose a risk when used in conjunction with oxygen therapy. Additionally, petroleum jelly can trap bacteria and potentially lead to infections. Instead, water-based lubricants or saline nasal sprays are safer alternatives for soothing dry nasal passages.
Choice D Reason:
Removing the nasal cannula while the client eats is not advisable because it interrupts the continuous delivery of oxygen, which is essential for clients with pneumonia who may already have compromised respiratory function. Instead, the nurse should ensure that the nasal cannula is securely in place and that the client is receiving the prescribed oxygen therapy at all times, including during meals.
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