Abstract
Backround
AVNRTis the most frequent type of regular paroxysmal Supraventricular Tachycardia
(SVT) .Catheter Radiofrequency Ablation (CRFA) has been recommended as first line
therapy for curing AVNRT.
Objective
This prospective study was conducted at AL-Kadhimiya Teaching Hospital from
January 2004 to July 2006 to report the 2 years experience of CRFA of the slow pathway
in patients with recurrent attacks of AVNRT refractory to medical therapy treated at
our Electrophysiology laboratory (EP Lab.) and assessed for success rate and
recurrence rate after CRFA.
Patients And Methods
Fifteen patients selected after diagnosis of typical AVNRT and been considered as
refractory to drug therapy when the full single or combined antiarrhythmic therapy
gave poor control. AVNRT diagnosed when the superficial ECG and the EP study
showed: a, regular narrow complex tachycardia. b, no p wave or short RP long PR .c,
VAinterval < 55 msc. d, dual AVN conduction and AH interval jump. CRFA done with
the use of a standard EPS with three diagnostic catheters and one RF Ablation catheter .
AVNRT induced either spontaneously or by programmed atrial stimulation . Ablation
done during tachycardia in 11 patients and during sinus rhythm in four . Slow pathway
ablation done using a combined electrophysiological and anatomical approach The
primary endpoint of CRFA was termination and or non-inducibility of AVNRT.
RESULTS: Acute success was achieved in 15 patients (100%) . The total procedure
time ranged from 30 minutes to one hour .The average fluoroscopy time was 10.5-+ 4.5
minutes .The patients were followed up for a mean of 15+- 3 months during which there
was only one case of recurrence cured by a second CRFA . Complete heart block is the
only complication and seen in one patient who needed permanent pacemaker
implantation.
AVNRTis the most frequent type of regular paroxysmal Supraventricular Tachycardia
(SVT) .Catheter Radiofrequency Ablation (CRFA) has been recommended as first line
therapy for curing AVNRT.
Objective
This prospective study was conducted at AL-Kadhimiya Teaching Hospital from
January 2004 to July 2006 to report the 2 years experience of CRFA of the slow pathway
in patients with recurrent attacks of AVNRT refractory to medical therapy treated at
our Electrophysiology laboratory (EP Lab.) and assessed for success rate and
recurrence rate after CRFA.
Patients And Methods
Fifteen patients selected after diagnosis of typical AVNRT and been considered as
refractory to drug therapy when the full single or combined antiarrhythmic therapy
gave poor control. AVNRT diagnosed when the superficial ECG and the EP study
showed: a, regular narrow complex tachycardia. b, no p wave or short RP long PR .c,
VAinterval < 55 msc. d, dual AVN conduction and AH interval jump. CRFA done with
the use of a standard EPS with three diagnostic catheters and one RF Ablation catheter .
AVNRT induced either spontaneously or by programmed atrial stimulation . Ablation
done during tachycardia in 11 patients and during sinus rhythm in four . Slow pathway
ablation done using a combined electrophysiological and anatomical approach The
primary endpoint of CRFA was termination and or non-inducibility of AVNRT.
RESULTS: Acute success was achieved in 15 patients (100%) . The total procedure
time ranged from 30 minutes to one hour .The average fluoroscopy time was 10.5-+ 4.5
minutes .The patients were followed up for a mean of 15+- 3 months during which there
was only one case of recurrence cured by a second CRFA . Complete heart block is the
only complication and seen in one patient who needed permanent pacemaker
implantation.