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  • Title: Elevation of postmortem triiodothyronine in sudden infant death syndrome and in infants who died of other causes: a marker of previous health.
    Author: Schwarz EH, Chasalow FI, Erickson MM, Hillman RE, Yuan M, Hillman LS.
    Journal: J Pediatr; 1983 Feb; 102(2):200-5. PubMed ID: 6822923.
    Abstract:
    We measured serum concentrations of thyroxine (T4), triiodothyronine (T3), reverse T3, free T4, thyroid-stimulating hormone, and cortisol in 62 victims of sudden infant death syndrome (SIDS) in 30 infants who died of known causes and in 15 living controls. The mean T3 value was elevated in 69% of those with SIDS. 37% of the others who died, and in no control infants. After excluding those who died of known cause who had abnormal thyroid function (abnormal postmortem concentrations of T4, free T4, or reverse T3), the T3 values were elevated in 63% of those remaining. When the data were analyzed on the basis of case histories and autopsy findings, those infants who were in good health and died suddenly of accidental causes had an elevation in mean T3 similar to that seen in SIDS victims; those who died under conditions known to alter thyroid metabolism did not. The T4, free T4, reverse T3, thyroid-stimulating hormone, and cortisol values were not useful in differentiating those with SIDS from the living controls, or those who were healthy at the time of death. We were unable to find any difference in T3 serum concentrations between the total group who had SIDS and those who had SIDS with minor infections, with petechiae on intrathoracic organs, with premature birth, or those who were resuscitated. Our data point out the importance of using appropriate controls when evaluating SIDS. The normal reverse T3 values in SIDS, as well as confirmation of the normal T4 and free T4 values, constitute evidence against chronic persistent alveolar hypoventilation or prolonged episodes of hypoxia immediately preceding death from SIDS.
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