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.

Answer and Explanation

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.

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Correct Answer is C

No explanation

A. Chronic obstructive pulmonary disease B. Laminectomy C. Hysterectomy D. Hyperthyroidism

Correct Answer is B

Explanation

Choice A Reason:

Chronic obstructive pulmonary disease (COPD) is inappropriate.COPD is a chronic lung disease characterized by airflow limitation. While COPD does not directly cause spinal stenosis, some individuals with COPD may have comorbidities or risk factors, such as osteoporosis or degenerative changes in the spine, which can contribute to spinal stenosis.

Choice B Reason:

Laminectomy is appropriate. A laminectomy is a surgical procedure used to decompress the spinal cord or nerves by removing the lamina (back part of the vertebra). While a laminectomy can be a treatment option for spinal stenosis, it is not a risk factor for developing the condition.

Choice C Reason:

Hysterectomy is inappropriate. Hysterectomy, the surgical removal of the uterus, is not directly associated with spinal stenosis. However, certain conditions or factors leading to a hysterectomy, such as pelvic tumors or endometriosis, may indirectly contribute to spinal stenosis if they cause changes in the spine or affect posture.

Choice D Reason:

Hyperthyroidism is appropriate. Hyperthyroidism, a condition characterized by excessive production of thyroid hormones, is not a known risk factor for spinal stenosis.

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Which of the following is true regarding the physiology of an open pneumothorax?

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Naxlex Comprehensive Predictor Exams

Which of the following is an example of a complication that causes noncardiogenic pulmonary edema?

Correct Answer is C

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Correct Answer is B

Explanation

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