The Outcome of Long QT Syndrome, a Korean Single Center Study
- Author:
Kyung Jin AHN
1
;
Mi Kyoung SONG
;
Sang Yun LEE
;
Ja Kyoung YOON
;
Gi Beom KIM
;
Seil OH
;
Eun Jung BAE
Author Information
- Publication Type:Original Research
- From:Korean Circulation Journal 2022;52(10):771-781
- CountryRepublic of Korea
- Language:English
-
Abstract:
Background and Objectives:Although long QT syndrome (LQTS) is a potentially lifethreatening inherited cardiac channelopathy, studies documenting the long-term clinical data of Korean patients with LQTS are scarce.
Methods:This retrospective cohort study included 105 patients with LQTS (48 women; 45.7%) from a single tertiary center. The clinical outcomes were analyzed for the rate of freedom from breakthrough cardiac events (BCEs), additional treatment needed, and death.
Results:LQTS was diagnosed at a median age of 11 (range, 0.003–80) years. Genetic testing was performed on 90 patients (yield, 71.1%). The proportions of genetically confirmed patients with LQTS types 1, 2, 3, and others were 34.4%, 12.2%, 12.2%, and 12.2%, respectively. In the symptomatic group (n=70), aborted cardiac arrest was observed in 30% of the patients. Treatments included medications in 60 patients (85.7%), implantable cardioverter-defibrillators in 27 (38.6%; median age, 17 years; range, 2–79 years), and left cardiac sympathetic denervation surgery in 7 (10%; median age, 13 years; range, 2–34). The 10-year BCE-free survival rate was 73.2%. By genotype, significant differences were observed in BCEs despite medication (p<0.001). The 10-year BCE-free survival rate was the highest in patients with LQTS type 1 (81.8%) and the lowest in those with multiple LQTS-associated mutations (LQTM). All patients with LQTS survived, except for one patient who had LQTM.
Conclusions:Good long-term outcomes can be achieved by using recently developed genetically tailored management strategies for patients with LQTS.
