When a child faints during exercise because of decreased oxygen supply to the body,which of the following is the most likely cause?

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Quizplus · Accepted Answer

Tetralogy of Fallot has the following components: (1)ventricular-septal defect,(2)stenosis of the pulmonary valve,(3)right ventricular hypertrophy,and (4)dextroposition of the aorta.Because these conditions are present at birth,the blood supply to the lungs is decreased,causing cyanosis,clubbing of fingers and toes,and an intolerance for activity.Surgery is the only treatment option.Transposition of the great vessels occurs when the positions of the pulmonary artery and the aorta are reversed.This disorder produces findings of cyanosis,tachypnea without respiratory distress,loud S?,and poor feeding in infants.Truncus arteriosus consists of only one artery that arises from the heart and forms the aorta and the pulmonary artery.Symptoms include cyanosis,congestive heart failure (CHF),tachypnea,and poor feeding.Hypoplastic left heart syndrome results in an underdeveloped left side of the heart.Findings are an infant that becomes ashen within days of birth,and sometimes is cyanotic.Additional symptoms include rapid breathing,difficulty feeding,CHF,shock,and multisystem organ failure.

When a Child Faints During Exercise Because of Decreased Oxygen