[QTc duration in the long QT syndrome type 2 - diagnostic dilemma].
We present a case of a 43-year old woman with a long QT syndrome (LQTS). Despite her family history of several sudden deaths in close relatives the patient was misdiagnosed, being treated many years for epilepsy. Finally, after another series of syncopal spells she was diagnosed with LQTS. Although QTc interval was normal on surface ECG, the presence of notched T-waves and QT prolongation up to 543 ms on Holter recording were helpful in establishing the correct diagnosis, which was later confirmed by genotyping revealing G601S mutation in the HERG gene. The patient refused an ICD and despite beta-blocker treatment died suddenly several months later.
Zienciuk
Agnieszka
A
Klinika Kardiologii i Elektroterapii Serca, Akademia Medyczna, ul. Debinki 7, 80-211 Gdańsk. agzien@amg.gda.pl
Machejek
Jakub
J
Cybulska
Celina
C
D000328:Adult; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D000072237:ERG1 Potassium Channel; D004562:Electrocardiography; D015716:Electrocardiography, Ambulatory; D004827:Epilepsy / Q000150:complications; D051638:Ether-A-Go-Go Potassium Channels / Q000235:genetics; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D008133:Long QT Syndrome / Q000150:complications / Q000175:diagnosis* / Q000235:genetics*; D009154:Mutation; D013575:Syncope / Q000175:diagnosis / Q000209:etiology
D000072237:ERG1 Potassium Channel; D051638:Ether-A-Go-Go Potassium Channels; C000606913:KCNH2 protein, human