Is it possible that long qt syndrome can be cause of sudden infant death syndrome?

YES: This is an ekg diagnosis and it means that there is an imbalance in the sympathetic (autonomic/automatic) innervation of the heart from the left stellate ganglion (the machnery that delivers control messages to the heart).. This important info was published years ago. It may respond to vitamin therapy and a more appropriate diet. See a nutritionist doctor.

Definitions matter: The full definition of the syndrome is sudden & unexplained infant death. If they were known to have prolonged QT it would not fit the definition. Four decades ago some cases of sepsis and metabolic disease were mislabeled SIDS . It could represent some.Many such ideas have been proposed aand looked at yet research is hampered by the unpredictable nature of the event.