الفهرس 
SUPRAVENTRICULAR TACHYCARDIAOnly 14 pages are availabe for public view
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Abstract
T
he autonomic nervous system has a significant regulatory effect on heart function; in addition to heart rate, cardiac conduction properties, hemodynamics, the cellular properties of cardiac myocytes, and cardiac arrhythmogenesis are also affected by the autonomic nervous system .
Supraventricular arrhythmias are common and patients are often symptomatic, requiring management with drugs and electrophysiological procedures. Recently, radiofrequency current ablation (RFCA) became the standard energy source in the management of patients with various types of tachyarrhythmia.
Several studies have demonstrated an increase in heart rate (HR) and a decrease in HR variability (HRV) after radiofrequency catheter ablation (RFCA) of supra-ventricular tachycardia due to vagal denervation.
In this study, we aimed to assess the Relationship between duration of RF current application during Catheter ablation and it’s effect on Heart Rate variability in patients undergoing RF catheter ablation for supraventricular Tachycardia.
This study is a prospective cohort study, which included 20 patients from Ain Shams University hospitals, who underwent RF ablation of SVT in the period from March 2020 till February 2021 and were followed up for 1 month after the procedure.
The patient’s mean age was 27.70 ± 8.08 years, The percent of females among the RF group was (65.0%), Statistical Relation between clinical characteristics of SVT regarding; Mean age in years, gender, SVT duration, SVT frequency, syncopal attacks, history of DC shock .
Compared with preablation data, HRV were shorter in the most RF ablation(85 % ) at the follow-up assessment. The 24-h Holter monitoring showed that mean and maximal HR were increased, whereas the HRV parameters, including time domain indices and frequency domain index which reflect the attenuation of parasympathetic tone, were decreased in the RFA during the postablation period.
10 patients (50%) complained of palpitations due to early post ablation high sinus rate ≥ 90 bpm . These results are demonstrated a significant increase in mean HR during 1 week follow up (89.00 ± 2.68 ) and after 1 month follow up (92.05 ± 4.03)
There was no statistically significant difference between the duration of RF current application and HRV parameters regarding in basal and follow up.