When a patient’s respirations are shallow: Select one:
A. carbon dioxide elimination is increased.
B. oxygenation occurs more efficiently.
C. chest rise will be easily noticeable.
D. tidal volume is markedly reduced.
The Correct Answer and Explanation is:
The correct answer is D. tidal volume is markedly reduced.
Explanation:
Shallow respirations refer to breaths that have a reduced depth, meaning that the volume of air taken in with each breath (tidal volume) is less than normal. This can occur for various reasons, such as pain, respiratory distress, or a neurological condition that limits the depth of breathing. When a person takes shallow breaths, they are not effectively moving the adequate amount of air in and out of the lungs.
Option D: Tidal volume is markedly reduced.
This is the correct choice because shallow respirations directly result in a reduction in tidal volume. Tidal volume is the amount of air inhaled or exhaled during a normal breath. With shallow breathing, the lungs do not expand fully, leading to less air being exchanged in the alveoli, where oxygen and carbon dioxide are exchanged. As a result, the amount of oxygen reaching the bloodstream and the amount of carbon dioxide being eliminated are both reduced. This can lead to oxygen deficiency (hypoxia) and a buildup of carbon dioxide (hypercapnia), potentially causing respiratory distress if left unaddressed.
Option A: Carbon dioxide elimination is increased.
This is incorrect because shallow breathing reduces the effectiveness of carbon dioxide elimination. The shallow breaths mean that less air is entering and exiting the lungs, impairing the removal of carbon dioxide from the body. Inadequate ventilation leads to CO₂ retention, which can cause respiratory acidosis if not corrected.
Option B: Oxygenation occurs more efficiently.
This is also incorrect. Shallow breathing reduces the efficiency of oxygenation. With less air entering the lungs, less oxygen is available for diffusion into the bloodstream, which decreases overall oxygenation.
Option C: Chest rise will be easily noticeable.
In shallow respirations, the chest rise is often not very noticeable because the depth of each breath is minimal. There may not be significant movement of the chest, making it harder to observe.
In summary, shallow respirations reduce tidal volume, which impairs both oxygenation and the elimination of carbon dioxide from the body. This is why D. tidal volume is markedly reduced is the correct answer.