Clinical Characteristic and Clinical Course of Aborted
Sudden Cardiac Death Patients with Structurally Normal
Heart in King Chulalongkorn Memorial Hospital
Suthasinee Thamaree MD*,
Buncha Sunsaneewitayakul MD**
Affiliation :
* Department of Medicine, Naresuan University Hospital, Phitsanulok, Thailand
** Heart Center, King Chulalongkorn Memorial Hospital, Bangkok, Thailand
Background : PED (Primary electrical disease) is an arrhythmogenic disease group that causes serious ventricular
tachyarrhythmia in the absence of recognized structural heart disease. Although Thailand, which is a part of Southeast
Asia, is an endemic area of PED, especially Brugada syndrome, there is little known about demographic data and clinical
outcome of PED among survivors of sudden cardiac death (SCD).
Objective : To study demographic data and clinical outcome of PED among survivors of SCD in Thailand.
Material and Method: The present study was approved by the ethics committee of the Faculty of Medicine, Chulalongkorn
University, Bangkok. The authors reviewed patient medical records for clinical characteristics, etiology, and clinical outcome
of survivors of SCD between January 2002 and December 2008. The patients with PED who had normal structural heart
and no obvious non-cardiac causes of sudden death were enrolled.
Results : Fifty-two survivors of SCD with PED (mean age 3912, 49 males), mainly from the northeast and middle regions
of Thailand, were recruited for this study. SCD mainly occurred during times when patients were asleep or resting (50%
and 15.4%) respectively. Of the 52 survivors, 21 patients (40%) had a documented family history of SCD. The etiology of
survivors of SCD is composed of Brugada syndrome (63.5%), Early repolarization syndrome (ERS) (9.6%), Congenital
long QT syndrome (LQTS) (7.7%), and idiopathic VF (3.8%). Remaining 15.4% had abnormal ECG but not compatible
with any etiology. A large number of patients (78.8%) completely recovered without neurological sequelae. The recurrence
of severe ventricular arrhythmia occurred in 27 patients (51.9%) during mean follow-up period 56.535.4 months (4 to137
months). The recurrence was highest during the first year (32%) of follow-up.
Conclusion : The Brugada syndrome is the most common etiology of survivors of SCD with normal structural heart in
Thailand. Although the prognosis after resuscitation was good, recurrence was especially high during the first year and as
a result, an ICD implantation is needed for prevented recurrence of SCD.
Keywords : Sudden cardiac arrest survivors, Aborted sudden cardiac arrest, Primary electrical disease
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