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(Circulation. 1955;11:789.)
© 1955 American Heart Association, Inc.

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Dye Dilution Curves and Cardiac Output in Newborn Infants

KLARA J. PREC M.D.¹ DONALD E. CASSELS M.D.¹

¹ From the Department of Pediatrics, University of Chicago Clinics, Chicago, Ill.

The pattern of dye dilution curves and the cardiac output was studied in 29 healthy newborn infants during the first 26 hours of life by the method of Wood and his associates. Thirty-six per cent of all infants studied had curves of normal contour which occurred mostly in infants older than 15 hours. Infants younger than 15 hours tended to have curves of abnormal shape. These were either diphasic or had the appearance of curves associated with left-to-right shunts and were probably caused by a patent ductus arteriosus. The mean cardiac output was 540 cc. per minute.

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