Neonatal hyperthyroidism and heart failure. A differential approach
E. S. Lightner, H. D. Allen and G. Loughlin
Congestive heart failure in neonatal thyrotoxicosis is attributed to
sympathetic overstimulation of the myocardium with resulting high-output
cardiac failure. An additional case of neonatal thyrotoxicosis with
congestive heart failure is discussed; three possible causes
(thyrotoxicosis, maternal propranolol therapy, and ventricular septal
defect) were present. Along with the usual procedures, the echocardiogram
is of value in separating these factors. In addition, we discuss the
potential dangers to the newborn of a mother receiving long-term
propranolol hydrochloride therapy during pregnancy.
