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Difficulty: Very hardCardiovascular System

Match each systemic disease or infectious etiology with its most characteristic cardiovascular manifestation or pathophysiologic consequence.

  • Ankylosing spondylitisFibrotic inflammation of the aortic root leading to an early diastolic murmur and potential atrioventricular conduction delays.
  • Systemic sclerosisProliferative obliterative vasculopathy of the pulmonary arterioles leading to severe cor pulmonale, without left-sided heart disease.
  • Hereditary hemochromatosisProgressive toxic cardiomyopathy initially presenting with a restrictive filling pattern, eventually evolving into a dilated phenotype with conduction system disease.
  • Carcinoid syndromeDeposition of collagen-rich plaques on the endocardium primarily affecting right-sided valves, presenting with prominent jugular v-waves and a pulsatile liver.
  • Trypanosoma cruzi infectionChronic fibrosing myocarditis resulting in biventricular dilation, pathognomonic apical aneurysms, and a high risk of mural thrombi.

Answer

Ankylosing spondylitis matches with fibrotic inflammation of the aortic root; Systemic sclerosis matches with proliferative obliterative vasculopathy (cor pulmonale); Hereditary hemochromatosis matches with toxic cardiomyopathy (restrictive to dilated); Carcinoid syndrome matches with collagen-rich plaques on right-sided valves; Trypanosoma cruzi infection matches with chronic fibrosing myocarditis and apical aneurysms.
Each systemic disease possesses a unique pathophysiologic mechanism affecting the cardiovascular system. Ankylosing spondylitis is associated with aortitis and resultant aortic regurgitation. Systemic sclerosis typically causes isolated pulmonary arterial hypertension due to obliterative vasculopathy. Hemochromatosis results in a mixed restrictive-dilated cardiomyopathy due to progressive iron toxicity. Carcinoid syndrome causes right-sided endocardial fibrosis due to high circulating levels of vasoactive peptides. Trypanosoma cruzi (Chagas disease) uniquely causes biventricular dilation with characteristic apical aneurysms and conduction blocks.

Step-by-Step Solution

1
Identify the cardiovascular manifestations of ankylosing spondylitis.
It causes aortitis, aortic root dilation, aortic regurgitation, and atrioventricular blocks.
Inflammation and subsequent fibrosis can extend from the aortic root into the intraventricular septum, directly affecting the conduction system.
2
Determine the primary cardiac complication of systemic sclerosis.
It classically causes pulmonary arterial hypertension (PAH) leading to right heart failure.
Intimal hyperplasia of the pulmonary arteries increases pulmonary vascular resistance without affecting left heart filling pressures.
3
Recall the cardiac progression of hereditary hemochromatosis.
It presents as a restrictive cardiomyopathy that progresses to a dilated cardiomyopathy, often with arrhythmias.
Iron accumulation creates a rigid myocardium initially, followed by toxic myocyte death and structural dilation.
4
Analyze the pathophysiology of carcinoid heart disease.
It causes right-sided valvular fibrosis, commonly tricuspid regurgitation and pulmonary stenosis.
Serotonin causes subendocardial fibrosis, but is metabolized by the lungs, protecting the left-sided valves from exposure.
5
Identify the unique cardiac features of chronic Chagas disease.
It causes biventricular heart failure, right bundle branch block, and classic apical aneurysms.
Chronic parasitic infection leads to focal myocarditis, localized wall thinning, and aneurysm formation predominantly at the left ventricular apex.

Key Concept

Cardiovascular manifestations of systemic and infectious diseases
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Topics

Cardiovascular System

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