This paper describes the exercise tolerance of a young girl with a congenital heart defect associated with asplenia syndrome. The child was exercised minimally on a treadmill for a period of 10 minutes, during which time heart rate, blood pressure, ECG, and transcutaneous PO2 values were monitored. Due to a small increase in heart rate and a very low PO2 during exercise, it was suggested that some adaptive mechanism had been developed to counteract her cyanotic condition. An optimal increase in hematocrit and hemoglobin levels supported this. No ECG abnormalities were noted. It was concluded that this child should have some, but minimal, involvement in physical education programs despite the severity of her condition.
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