A 23-year-old woman with extensive burn injuries develops diffuse alveolar damage and becomes short of breath. Auscultation reveals pulmonary rales (rattling sounds). What is the most likely cause of rales and dyspnea in this patient?
Bacterial pneumonia
Cardiogenic shock
Congestive heart failure
Dehydration (hypovolemic shock)
Pulmonary edema
The Correct Answer is E
A. Bacterial pneumonia: Bacterial pneumonia can cause dyspnea and rales, but it typically presents with fever, localized infiltrates on imaging, and productive cough. In this patient, the acute onset following extensive burns points toward non-infectious pulmonary injury rather than a primary bacterial infection.
B. Cardiogenic shock: Cardiogenic shock results from acute cardiac pump failure, leading to hypotension and poor organ perfusion. While pulmonary edema may accompany cardiogenic shock, there is no indication in this scenario that the patient has primary cardiac dysfunction; the burns and systemic inflammatory response are the key factors.
C. Congestive heart failure: Congestive heart failure causes pulmonary congestion and rales due to left ventricular dysfunction. This patient’s diffuse alveolar damage is a direct result of burn-induced systemic inflammation rather than chronic or acute cardiac failure, making CHF less likely.
D. Dehydration (hypovolemic shock): Hypovolemic shock from fluid loss in burns leads to low blood pressure and poor tissue perfusion. It does not cause pulmonary edema or alveolar rales, which are related to fluid accumulation in the lungs rather than intravascular volume depletion.
E. Pulmonary edema: Diffuse alveolar damage from burn injuries increases alveolar-capillary permeability, allowing protein-rich fluid to accumulate in alveoli. This results in pulmonary edema, causing rales on auscultation and dyspnea due to impaired gas exchange, making it the most likely cause of the patient’s respiratory findings.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Caseous:A Ghon complex is characteristic of primary tuberculosis infection caused by Mycobacterium tuberculosis. The hallmark histologic feature is caseating granulomatous inflammation, with central caseous necrosis surrounded by epithelioid macrophages, Langhans giant cells, and lymphocytes. The necrotic center has a cheese-like appearance due to lipid-rich mycobacterial cell walls and immune-mediated tissue destruction.
B. Coagulative:Coagulative necrosis is typically seen in ischemic injury to solid organs such as the heart, kidneys, and spleen. Cellular architecture is preserved temporarily despite cell death, which differs from the amorphous, granular debris seen in caseous necrosis associated with tuberculosis.
C. Fat:Fat necrosis occurs in adipose tissue, commonly in acute pancreatitis or traumatic injury to fatty tissue. It involves enzymatic destruction of fat cells and formation of chalky calcium soaps, a process unrelated to granulomatous infections like tuberculosis.
D. Fibrinoid:Fibrinoid necrosis is associated with immune-mediated vascular damage, such as in vasculitis or malignant hypertension. It involves deposition of immune complexes and fibrin within vessel walls, not the granulomatous pattern typical of tuberculosis.
E. Liquefactive:Liquefactive necrosis is most commonly seen in brain infarctions and bacterial infections that produce pus. It results in complete digestion of dead cells into a liquid mass, which differs from the dry, cheese-like necrosis observed in tuberculosis.
Correct Answer is C
Explanation
A. Acute myocardial infarction:Acute myocardial infarction can present with sudden collapse and hypotension, but it is uncommon in a young postpartum woman without significant coronary risk factors. The diastolic murmur and diminished pulses are not typical features of an MI.
B. Amniotic fluid embolism:Amniotic fluid embolism usually occurs during labor or immediately postpartum, presenting with sudden respiratory distress, hypotension, and coagulopathy. Collapse two days postpartum with a diastolic murmur and diminished pulses is less consistent with this condition.
C. Dissecting aortic aneurysm:Aortic dissection is suggested by sudden collapse, hypotension, diminished peripheral pulses, and a diastolic murmur of aortic regurgitation. A family history of early Marfan syndrome increases risk due to connective tissue weakness, making acute aortic dissection the most likely diagnosis in this postpartum patient.
D. Pulmonary thromboembolism:Pulmonary embolism can cause sudden collapse and dyspnea postpartum, but it rarely produces a diastolic murmur or diminished peripheral pulses. The presence of these cardiovascular signs points toward aortic pathology rather than pulmonary embolism.
E. Ruptured berry aneurysm:Ruptured cerebral aneurysms typically present with sudden severe headache, loss of consciousness, or neurological deficits. They do not explain the diastolic murmur or diminished pulses in the context of this patient’s cardiovascular collapse.
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