Challenges of diagnosis of long-QT syndrome in children.
We describe the clinical and genetic characteristics of the family, in which the diagnosis of LQT1 had been made. The electrocardiogram (ECG) characteristics of this patient indicated the likelihood of LQTS1. Polymorphic ventricular extrasystolies and episodes of polymorphic non-sustained ventricular tachycardia were confirmed by Holter ECG monitoring. On the exertional electrocardiogram polymorphic ventricular tachycardia (torsade de pointes) was recorded. Direct sequencing of both DNA strands revealed the absence of mutations or polymorphisms in the KCNQ1, HERG, and SCN5A genes.
Moric-Janiszewska
Ewa
E
Department of Biochemistry, Medical University of Silesia, Narcyzów, Poland. ejaniszewska@slam.katowice.pl
Markiewicz-Łoskot
Grazyna
G
Łoskot
Maria
M
Weglarz
Ludmiła
L
Hollek
Andrzej
A
Szydłowski
Lesław
L
D000293:Adolescent; D000328:Adult; D002648:Child; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005820:Genetic Testing / Q000379:methods*; D006801:Humans; D008133:Long QT Syndrome / Q000175:diagnosis* / Q000235:genetics*