Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Marfan Syndrome

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In one line

·Marfan syndrome is a connective tissue disorder caused by defective fibrillin-1 protein, leading to fragile elastic fibers in the aorta, eyes, and skeleton that stretch and tear under normal body stress.

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Normal physiology

·Fibrillin-1 is a structural protein that forms microfibrils (tiny fibers) in the extracellular matrix (the scaffolding between cells). These microfibrils give strength and elasticity to connective tissues throughout the body, especially in blood vessel walls, the lens suspensory ligaments in the eye, and the periosteum (bone covering) and ligaments. Fibrillin-1 also stores and regulates transforming growth factor beta (TGF-β), a signaling molecule that controls cell growth and tissue repair.

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What goes wrong

·In Marfan syndrome, a mutation (spelling mistake) in the FBN1 gene causes the body to make abnormal fibrillin-1 protein or not enough of it. Without properly working fibrillin-1, the microfibrils are weak and break easily. Tissues that need to stretch and recoil—like the aorta wall, the eye lens ligaments, and bone ligaments—become fragile and overstretch under normal daily stress.

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Hallmark signs

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Red flags · escalate now

·Sudden severe chest or back pain (possible aortic dissection—activate code team and order STAT CT angiography)
·New heart murmur with fainting (syncope) or heart failure symptoms (acute valve rupture or severe regurgitation—urgent cardiology consult)
·Blood pressure difference >20 mmHg between arms (dissection extending into brachiocephalic vessels—immediate imaging)
·Shortness of breath with unilateral absent breath sounds (spontaneous pneumothorax—needs chest X-ray and possible chest tube)

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Workup

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Treatment

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NCLEX trap

·Screening requires clinical criteria including skeletal features plus cardiovascular or ocular findings or positive genetic testing. Height alone is not diagnostic.
·Low to moderate intensity aerobic exercise is encouraged. Avoid contact sports, weightlifting, and activities that cause sudden blood pressure spikes. Staying active improves overall health.
·Aortic dissection can cause low blood pressure (hypotension) if rupture occurs or if the dissection blocks blood flow. Blood pressure differences between arms are more significant than absolute values.
·Beta-blockers slow aortic root dilation but do not cure the disease. Patients still need regular echocardiograms and may require preventive (prophylactic) aortic surgery when the aorta reaches 5.0 cm diameter.
·Ectopia lentis causes vision problems but can be corrected with special glasses or surgery. Regular ophthalmology follow-up preserves vision. Retinal detachment is the greater risk for blindness.
·Pregnancy increases aortic dissection risk, especially if the aortic root is enlarged. Women with aortic root under 4.0 cm can often carry pregnancy safely with close monitoring. High-risk obstetrics and cardiology co-management is essential.

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