Jug handle sign
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"jug handle sign" radiology medicine
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"jug handle sign"
Jug-handle sign is a chest X-ray appearance of pulmonary arterial hypertension.
- It results from prominence/dilatation of the right pulmonary artery, often with an enlarged central pulmonary arterial segment.
- The hilar pulmonary artery contour resembles the handle of a jug.
- It may be seen in primary pulmonary arterial hypertension and in congenital heart disease with pulmonary hypertension, including Eisenmenger syndrome.
It is a supportive radiographic sign, not diagnostic by itself. The described chest X-ray appearance is associated with a prominent right pulmonary artery.
Why pulm art dilation in pah
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"pulmonary hypertension" AND "pulmonary artery dilatation"
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pulmonary arterial hypertension main pulmonary artery dilatation mechanism pressure wall stress review
In PAH, the small pulmonary arteries become narrowed and stiff because of vasoconstriction, vascular-wall remodeling, and sometimes thrombosis. This raises pulmonary vascular resistance.
The main pulmonary artery must then carry blood against persistently high pressure. Over time:
- Chronic high intraluminal pressure stretches its wall.
- High-velocity, turbulent flow and shear stress add mechanical stress.
- The artery undergoes structural remodeling and gradually enlarges.
So, pulmonary artery dilatation is a chronic pressure-and-flow consequence of PAH, similar in principle to dilatation of the aorta in longstanding systemic hypertension. Its size does not always parallel the current pulmonary pressure exactly, because the vessel can continue to remodel over time. A study indexed on PubMed found progressive main pulmonary artery enlargement in PAH even when pressure changes did not closely track it.
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