Heart Rate Variability Analysis of Patients With Idiopathic Left Ventricular Outflow Tract Tachycardia
| Autor: | Norihiro Ueda, Eimei Shimoike, Yoshiyuki Niho, Toru Maruyama, Takehiko Fujino, Yoshikazu Kaji, Shozo Kanaya |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Male
Tachycardia medicine.medical_specialty Heart disease Physiology Ventricular tachycardia Electrocardiography Ventricular Dysfunction Left Heart Rate Internal medicine Heart rate medicine Humans Heart rate variability Ventricular outflow tract cardiovascular diseases medicine.diagnostic_test business.industry Middle Aged medicine.disease Ventricular Premature Complexes Electrophysiology Anesthesia Tachycardia Ventricular cardiovascular system Cardiology medicine.symptom Cardiology and Cardiovascular Medicine business |
| Zdroj: | Japanese Circulation Journal. 63:629-635 |
| ISSN: | 1347-4839 0047-1828 |
| DOI: | 10.1253/jcj.63.629 |
| Popis: | There have been several reports with respect to idiopathic ventricular tachycardias (VTs) originating from the left ventricular outflow tract (LVOT). A previous report suggested that triggered activity plays a partial role in idiopathic LVOT tachycardia from the electrophysiological as well as the electropharmacological viewpoint. However, the exact role of triggered activity in this type of VT remains unknown. In the present study the relationship of the frequency of premature ventricular contractions (PVCs) and heart rate was examined and heart rate variability (HRV) was analyzed in 2 cases of LVOT tachycardia using 24-h Holter electrocardiographic (ECG) monitoring. The relation between the PVCs frequency and heart rate showed a persistently positive correlation, indicating frequent PVCs as heart rate increased. In HRV analysis, NN50(%), a time-domain variable of parasympathetic activity, showed no change prior to ventricular arrhythmias. In frequency-domain analysis of HRV, the high frequency (HF) component tended to fall prior to repetitive PVCs and VTs. The ratio of the low frequency to high frequency (LF/HF) components increased prior to single PVCs, repetitive PVCs and VTs. Sympathetic predominance predisposes the genesis of these kinds of arrhythmias originating from the LVOT and it is suggested that triggered activity plays an important role in LVOT tachycardia, at least in its initiation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|