Coarctation of the aorta and a bicuspid aortic valve can cause lower extremity cyanosis, meaning a bluish or purplish discoloration of the lower limbs, and can result in congestive heart failure.
London was soon far behind them, replaced by neat green fields which gave way in turn to wide, purplish moors, villages with tiny toy churches, and a great city alive with cars like multicolored ants.