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Cyanotic heart defect is a group-type of congenital heart defect (CHD) that occurs due to deoxygenated blood bypassing the lungs and entering the systemic circulation or a mixture of oxygenated and unoxygenated blood entering the systemic circulation. It is caused by structural defects of the heart (i.e.:right-to-left, bidirectional shunting, malposition of the great arteries), or any condition which increases pulmonary vascular resistance. The result being the development of collateral circulation. == Signs and symptoms == *Clubbing *The patient assuming a crouching position *Cyanosis - facial discolouration (particularly the lips) and digit discolouration (fingers & toes). *Crying *Crabbiness/irritability *Tachycardia *Tachypnea *A history of inadequate feeding. *Unusually large toe & fingernails. *Delayed development (both biological & psychological). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「cyanotic heart defect」の詳細全文を読む スポンサード リンク
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