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Cardiac function of neonates with congenital hypothyroidism before treatment
Insights
Congenital hypothyroidism in newborns does not show immediate myocardial dysfunction. Early mass screening for congenital hypothyroidism may prevent cardiac issues and other developmental problems.
Area of Science:
- Pediatrics
- Endocrinology
- Cardiology
Background:
- Previous reports indicate myocardial dysfunction in adults and children with hypothyroidism.
- Congenital hypothyroidism is a condition affecting newborns that requires early detection and management.
Purpose of the Study:
- To investigate the presence of myocardial dysfunction in newborns with congenital hypothyroidism.
- To assess cardiac function in the immediate newborn period using electrocardiography and echocardiography.
Main Methods:
- Studied 12 newborns with congenital hypothyroidism (ages 7-28 days).
- Utilized standard electrocardiographic (ECG) and echocardiographic techniques.
- Assessed heart rate, QRS voltages, T-wave morphology, ST-segments, and myocardial function.
Main Results:
- ECG showed normal heart rates and QRS voltages in all infants.
- Five infants exhibited abnormal dome-shaped T-waves and absent ST-segments (Mosque sign).
- Echocardiograms were normal, indicating no myocardial dysfunction or pericardial effusion.
Conclusions:
- Myocardial dysfunction is not present in the immediate newborn period for infants with congenital hypothyroidism.
- Early detection of congenital hypothyroidism via mass screening is crucial.
- Screening may prevent cardiac complications and other sequelae associated with congenital hypothyroidism.
Abstract:
Because of previous reports of myocardial dysfunction in adults and children with hypothyroidism, 12 newborns with congenital hypothyroidism were studied using standard electrocardiographic and echocardiographic techniques. The infants were between the ages of 7 and 28 days at the time of study. Five infants were athyrotic, and of these two had delayed skeletal maturation. Electrocardiogram revealed normal heart rates and QRS voltages in all children, while five had abnormal dome-shaped T-waves and absent ST-segments (Mosque sign). Echocardiograms were normal in all patients indicating no myocardial dysfunction or pericardial effusion. This study suggests that myocardial dysfunction is not present in the immediate newborn period of infants with congenital hypothyroidism. It is reasonable to conclude that early detection of congenital hypothyroidism by mass screening may prevent the cardiac affects of hypothyroidism as well as the other known sequelae.