<prompt> Coarctation of the aoa is common in which syndrome-DownsTurnersKlinefeltersNoonans  <response>: Ans. is b i.e., Turners syndrome Coarctation of aoa o Coarctation of aoa CoA is a constriction of aoa due to sharp indentation involving anterior, lateral and posterior wall of aoa. o The medial wall is spared in the narrowing. 98 of coarctation occur just below the origin of left subclan occur at the origin of ductus aeriosus Juxtaductal coarctation. It may occur just proximal to subclan A. also. o COA may be a feature of turner syndrome, and is associated with a bicuspid aoic valve. o When COA is associated with mitral valve abnormality and subaoic stenosis, it is referred to as shone complex. 