Which of the following is true regarding the physiology of an open pneumothorax?
Air cannot pass freely into the thoracic cavity through a chest wound.
The air is trapped when it enters the cavity.
Air moves in and out of a wound in the chest wall.
There are no audible sounds in an open pneumothorax.
The Correct Answer is C
Choice A Reason:
Air cannot pass freely into the thoracic cavity through a chest wound is incorrect because air can indeed pass freely into the thoracic cavity through the chest wound in an open pneumothorax.
Choice B Reason:
The air is trapped when it enters the cavity is incorrect because the characteristic feature of an open pneumothorax is that air is not trapped; rather, it enters the thoracic cavity with each inhalation and exits with each exhalation through the chest wound.
Choice C Reason:
Air moves in and out of a wound in the chest wall is correct. In an open pneumothorax, also known as a "sucking chest wound," air can freely move in and out of the thoracic cavity through a wound in the chest wall. This occurs due to the creation of a communication pathway between the external environment and the pleural space, typically caused by a penetrating injury to the chest.
Choice D Reason:
There are no audible sounds in an open pneumothorax is incorrect because in an open pneumothorax, there may be audible sounds associated with the movement of air in and out of the wound, such as a sucking or bubbling sound, depending on the size and location of the wound. These sounds can be clinically significant and aid in the diagnosis of an open pneumothorax.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A Reason:
Osteoporosis is inappropriate. Chronic respiratory acidosis can lead to osteoporosis over time due to several factors, including chronic hypoxemia, which can affect bone metabolism and lead to bone loss.
Choice B Reason:
Polyuria is inappropriate. Polyuria, or increased urination, is not typically associated with chronic respiratory acidosis. In fact, respiratory acidosis tends to cause retention of bicarbonate ions, which can lead to compensatory metabolic alkalosis and decreased urine output.
Choice C Reason:
Anxiety and depression is inappropriate. Chronic respiratory acidosis can lead to symptoms such as lethargy, confusion, and decreased mental acuity due to the effects of elevated CO2 levels on the central nervous system. While anxiety and depression are not direct consequences of chronic respiratory acidosis, individuals with COPD may experience anxiety and depression as a result of their chronic respiratory condition.
Choice D Reason:
Delirium is correct. Delirium, characterized by an acute change in mental status, confusion, and altered consciousness, can occur in severe cases of chronic respiratory acidosis, especially during acute exacerbations. Elevated CO2 levels can affect brain function and lead to symptoms of delirium.
Correct Answer is D
Explanation
Choice A Reason:
Hypertension is not typically associated with heterotopic ossifications. However, it may occur in individuals with spinal cord injuries (SCI) due to autonomic dysreflexia, a condition characterized by an exaggerated sympathetic response to stimuli below the level of injury. Autonomic dysreflexia can lead to a sudden increase in blood pressure, which, if left untreated, can result in complications such as stroke or seizure. However, hypertension is not directly related to heterotopic ossifications.
Choice B Reason:
Bradycardia is also not typically associated with heterotopic ossifications. Like hypertension, bradycardia may occur in individuals with SCI due to autonomic dysreflexia. Autonomic dysreflexia can lead to a sudden increase in blood pressure and a reflex bradycardia in response to the increased sympathetic outflow. However, bradycardia is not directly related to heterotopic ossifications.
Choice C Reason:
Fecal impaction is a potential complication of spinal cord injury (SCI) due to impaired bowel function, but it is not directly related to heterotopic ossifications. SCI can disrupt normal bowel motility and result in neurogenic bowel dysfunction, leading to symptoms such as constipation, fecal impaction, and bowel obstruction. However, fecal impaction is not specific to heterotopic ossifications.
Choice D Reason:
Arthralgia is correct. Heterotopic ossifications (HO) involve the abnormal formation of bone in soft tissues around joints, muscles, tendons, or ligaments. When HO occurs around joints, it can lead to symptoms such as pain, swelling, and decreased range of motion, collectively known as arthralgia. Therefore, arthralgia is a common finding associated with heterotopic ossifications in individuals with spinal cord injuries.
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