A 22-year-old construction worker falls 30 feet and fractures several bones, including his left femoral shaft. Six hours later, the patient develops shortness of breath and cyanosis. Which of the following hemodynamic disorders best explains the pathogenesis of respiratory distress in this patient?
Acute myocardial infarction
Congestive heart failure
Deep venous thrombosis
Fat embolism
Sepsis
The Correct Answer is D
A. Acute myocardial infarction: Acute myocardial infarction results from coronary artery occlusion leading to myocardial ischemia and necrosis. While it can cause shortness of breath due to left ventricular dysfunction, it is unlikely to occur suddenly in a young trauma patient and does not directly relate to long bone fractures.
B. Congestive heart failure: Congestive heart failure develops when the heart cannot pump effectively, leading to pulmonary congestion and dyspnea. This condition typically evolves over time and is associated with chronic cardiac disease rather than acute respiratory distress occurring within hours of a femoral fracture.
C. Deep venous thrombosis: Deep venous thrombosis can develop after trauma and immobilization, but clinically significant pulmonary embolism from DVT usually occurs days rather than hours after injury. The rapid onset of respiratory distress within six hours is more consistent with fat embolism syndrome.
D. Fat embolism: Fat embolism commonly occurs after fractures of long bones such as the femur. Fat globules released from bone marrow enter the bloodstream and lodge in pulmonary capillaries, causing mechanical obstruction and inflammatory injury. This leads to hypoxemia, dyspnea, and cyanosis within hours of trauma.
E. Sepsis: Sepsis involves a systemic inflammatory response to infection and typically presents with fever, hypotension, and signs of organ dysfunction. It does not develop within hours of a sterile traumatic fracture and would not explain the acute respiratory compromise in this scenario.
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Correct Answer is D
Explanation
A. Cardiac tamponade:Cardiac tamponade occurs when fluid accumulates in the pericardial sac, compressing the heart and reducing cardiac output. Gross pathology shows pericardial effusion rather than a localized area of myocardial necrosis, making it an unlikely cause here.
B. Congestive heart failure:Congestive heart failure results from chronic ventricular dysfunction and presents with pulmonary congestion, peripheral edema, and hepatomegaly. It does not produce a well-demarcated, yellow-tan area of necrosis in the ventricular wall.
C. Hypovolemic shock:Hypovolemic shock is due to severe blood or fluid loss, leading to systemic hypotension and multi-organ hypoperfusion. The heart itself does not show a focal infarct as seen in this autopsy finding.
D. Myocardial infarction:A myocardial infarction occurs when coronary artery obstruction causes ischemic necrosis of the myocardium. The gross pathological finding of a well-defined yellow-tan area in the left ventricular wall corresponds to coagulative necrosis following MI and is the most likely cause of death in this patient.
E. Pulmonary thromboembolism:Pulmonary thromboembolism involves obstruction of pulmonary arteries by thrombus, which can cause acute right heart strain and sudden death. It does not produce a focal infarct in the left ventricular wall.
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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