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Prolonged QT interval and sudden infant death--report of two cases
T Bajanowski1, L Rossi, B Biondo
1Institute of Legal Medicine, Westfälische Wilhelms-Universität, Von Esmarch-Strasse 62, D-48149 Münster, Germany.
Insights
Sudden infant death may be linked to long QT syndrome (LQTS). Further investigation is needed as genetic testing did not reveal mutations in key cardiac ion channel genes.
Area of Science:
- Cardiology
- Pediatric Pathology
- Molecular Genetics
Background:
- Sudden unexpected infant death necessitates thorough investigation into potential underlying cardiac conditions.
- Long QT syndrome (LQTS) is a cardiac channelopathy that can lead to fatal arrhythmias.
Observation:
- Two cases of sudden infant death prompted suspicion of LQTS based on sibling/twin electrocardiograms (ECGs).
- Case 1 revealed His bundle (HB) dispersion and right external nucleus arcuatus hypoplasia.
- Case 2 showed severe interstitial pneumonia and mild myocarditis on histology.
Findings:
- Electrocardiograms (ECGs) in a sibling and a twin raised suspicion for long QT syndrome (LQTS).
- Molecular genetic analysis of HERG, KVLQT1, and SCN5A genes did not identify mutations.
- No specific genetic cause for repolarization inhomogeneity was found.
Implications:
- The study highlights the diagnostic challenges in identifying LQTS without clear genetic markers.
- Further research is needed to explore non-genetic factors contributing to sudden infant death and LQTS.
- Understanding the interplay between genetic and non-genetic factors is crucial for diagnosing and preventing LQTS-related deaths.
Abstract:
In the two cases where infants died suddenly and unexpectedly the electrocardiogram (ECG) of a younger sibling (case 1) and of a living twin (case 2) led to the suspicion that the two infants could have died from long QT syndrome (LQTS). In case 1, a His bundle (HB) dispersion and a pronounced hypoplasia of the right external nucleus arcuatus were detected. In case 2, a severe interstitial pneumonia and an accompanying mild myocarditis were found by histology. Molecular genetic investigations of the coding regions of the genes, HERG, KVLQT1 and SCN5A gave no indication for the mutations, thus, affecting related myocardial ion channels as possible sources of inhomogeneity of repolarisation. Since a molecular genetic deviation could not yet be elaborated the possible role of related disturbance remains unknown.