Around three weeks after razing an old chicken house, a 71 year-old retired farmer has developed a fever, nausea and vomiting. After ruling out more common health problems, his care provider eventually made a diagnosis of histoplasmosis. Which physiological process is most likely taking place?
Antibody production against the offending fungi is delayed by the patient's age and the virulence of the organism
Macrophages are able to remove the offending fungi from the bloodstream but can't destroy them
Spore inhalation initiates an autoimmune response that produces the associated symptoms
Toxin production by Histoplasma capsulatum is triggering an immune response
The Correct Answer is A
A. Antibody production against the offending fungi is delayed by the patient's age and the virulence of the organism: In older adults, the immune response may be slower or less effective due to age-related changes in the immune system. The virulence of Histoplasma capsulatum can also contribute to the severity of the infection, making it more difficult for the immune system to mount an effective response quickly, which explains the symptoms of fever, nausea, and vomiting.
B. Macrophages are able to remove the offending fungi from the bloodstream but can't destroy them: While macrophages play a crucial role in the immune response to fungi, in the case of histoplasmosis, they often engulf the fungi but may struggle to completely eradicate them, especially in immunocompromised individuals or the elderly. However, this option does not fully explain the delayed symptoms associated with the patient's age and the organism's virulence.
C. Spore inhalation initiates an autoimmune response that produces the associated symptoms: Histoplasmosis is caused by inhaling spores of Histoplasma capsulatum, but the symptoms are not the result of an autoimmune response. Instead, the immune system's attempt to combat the infection leads to the clinical manifestations, not an autoimmune process.
D. Toxin production by Histoplasma capsulatum is triggering an immune response: Histoplasma capsulatum does not produce toxins that directly trigger an immune response. Instead, the immune response is primarily due to the presence of the fungi themselves and the inflammatory response they provoke, which leads to the associated symptoms of the infection.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Increase peripheral resistance: An increase in peripheral resistance contributes to hypertension by raising the pressure in the arteries. This condition often results from vasoconstriction or structural changes in the blood vessels, leading to higher overall blood pressure.
B. Decrease in cardiac output: A decrease in cardiac output typically does not cause hypertension. In fact, low cardiac output may lead to hypotension (low blood pressure) since there is less blood being pumped into the circulatory system. This option is the exception when discussing physiological causes of hypertension.
C. Both increased cardiac output and peripheral resistance: Both increased cardiac output and peripheral resistance can lead to hypertension. An increase in either factor can elevate blood pressure, and their combined effect can significantly contribute to the development of hypertension.
D. Increased cardiac output: Increased cardiac output raises blood pressure by delivering more blood to the arteries with each heartbeat. This can occur due to various factors such as increased fluid volume, increased heart rate, or heightened contractility of the heart.
Correct Answer is C
Explanation
A. Prolonged PR interval: A prolonged PR interval is typically indicative of first-degree atrioventricular (AV) block and does not specifically relate to the presence of myocardial infarction (MI) that extends through the myocardium.
B. ST depression: ST depression can indicate subendocardial ischemia, but it is not a definitive change associated with a full-thickness myocardial infarction. It is more commonly seen during stress testing or in cases of angina rather than a transmural infarction.
C. ST elevation: ST elevation is a characteristic finding in cases of transmural myocardial infarction (MI), indicating that the injury extends through the myocardium from the endocardium to the epicardium. This elevation occurs due to the acute injury to the myocardial cells, leading to changes in the electrical activity as reflected on the ECG.
D. Prolonged QT interval: A prolonged QT interval is associated with an increased risk of arrhythmias but does not specifically indicate a myocardial infarction that penetrates through the myocardium. It is generally not directly related to the ischemic process of an MI.
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