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 D

Explanation

Correct answer: D

Choice A Reason:

Decreased pulmonary vascular resistance is incorrect. Inflammatory mediators released in response to a pulmonary embolism can lead to vasoconstriction and increased pulmonary vascular resistance. This is part of the body's response to redirect blood flow away from the affected area of the lung and maintain adequate perfusion to other areas.

Choice B Reason:

Hypercapnia is incorrect. Hypercapnia refers to elevated levels of carbon dioxide (CO2) in the blood.Hypocapnia usually is present with embolism; hypercapnia, on the other hand, is rare.

Choice C Reason:

Hypoventilation is incorrect. Hypoventilation occurs when there is inadequate ventilation of the lungs relative to metabolic demands. In the context of a pulmonary embolism, hypoventilation can occur due to factors such as pain, respiratory muscle fatigue, or impaired gas exchange, all of which can be influenced by the release of inflammatory mediators.

Choice D Reason:

Respiratory alkalosis is correct.In response to the blockage and the resulting inflammation, the body often increases the respiratory rate as a compensatory mechanism to maintain adequate oxygen levels and remove carbon dioxide.Due to the increased breathing rate, there is excessive exhalation of carbon dioxide, leading to a decrease in the partial pressure of CO2 in the blood. This results in an increase in blood pH, causing respiratory alkalosis.

A. Dulaglutide B. Montelukast sodium C. Glatiramer acetate D. Oxybutynin

Correct Answer is D

Explanation

Choice A Reason:

Dulaglutide is inappropriate. Dulaglutide is a medication used to treat type 2 diabetes by improving blood sugar control. It is not indicated for the management of neurogenic bladder or urinary incontinence.

Choice B Reason:

Montelukast sodium is inappropriate. Montelukast sodium is a medication primarily used to treat asthma and allergic rhinitis by blocking leukotrienes, which are inflammatory substances that contribute to asthma and allergy symptoms. It is not indicated for the management of neurogenic bladder or urinary incontinence.

Choice C Reason:

Glatiramer acetate is inappropriate. Glatiramer acetate is a medication used to treat relapsing-remitting multiple sclerosis (MS) by modulating the immune system. It is not indicated for the management of neurogenic bladder or urinary incontinence.

Choice D Reason:

Oxybutynin is appropriate. Oxybutynin is a medication commonly prescribed for the management of neurogenic bladder and urinary incontinence. It belongs to a class of medications called anticholinergics, which work by relaxing the bladder muscles and reducing bladder spasms. Oxybutynin helps control urinary urgency, frequency, and incontinence associated with neurogenic bladder, including spasm-induced incontinence.

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

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