The following information may help to address your question:
I have long QT syndrome, as does many of my family members. Some of these family members have been found to carry a mutation in a long QT syndrome gene, others with the condition do not. How can this be?
There have been many studies conducted to determine the impact of stimulant medications for attention deficit disorder and attention deficit hyperactivity disorder on the QT interval as observed by an electrocardiogram (EKG). However, we were not able to identify information in the medical literature that suggests that there is a direct association between the incidence of attention deficit disorder and long QT syndrome in an individual. We recommend you speak to your health care provider about your concerns.
Common symptoms of celiac disease such as diarrhea and vomiting are known to temporarily result in long QT. However, we were not able to identify information in the medical literature that suggests that there is a direct association between celiac disease and long QT syndrome. We recommend you speak to your health care provider about your concerns.
You can find information about labs that offer genetic testing for celiac disease through the Genetic Testing Registry (GTR). The intended audience for the GTR is health care providers and researchers. Therefore, people with specific questions about genetic testing for celiac disease should speak with their health care provider or a genetics professional.