Overview
Atrioventricular (AV) tachycardia involves rapid heart rhythms originating from the atrioventricular node or accessory pathways, leading to symptoms ranging from palpitations to hemodynamic instability depending on the rate and duration 12.Diagnosis
Electrocardiogram (ECG): Essential for identifying tachycardia type (AVNRT vs. AVRT) through characteristic patterns 1.
Para-Hisian entrainment: Useful maneuver to differentiate AVNRT from AVRT by assessing retrograde activation patterns 1.
Electrophysiological study (EPS): Confirmatory test for identifying accessory pathways and guiding ablation strategies 2.Management
Radiofrequency catheter ablation: Effective first-line treatment, particularly successful in pediatric and young adult populations (73% success rate) 2.
Subthreshold atrial pacing: Effective method for terminating AV tachycardia in patients with left-sided accessory pathways 3.
Pharmacological therapy: Verapamil and somatostatin can terminate reentry tachycardia; somatostatin may induce ventricular extrasystoles 4.Special Populations
Pediatrics: Radiofrequency ablation shows high efficacy and safety in children and young adults 2.
Comorbidities: No specific recommendations provided in the abstracts regarding comorbidities; individualized approach advised 4.Key Recommendations
Utilize para-Hisian entrainment during EPS to differentiate AVNRT from AVRT for precise diagnosis (Evidence: Moderate) 1.
Consider radiofrequency catheter ablation as the primary treatment modality for AV reentrant tachycardias, especially in pediatric and young adult patients (Evidence: Strong) 2.
Employ subthreshold atrial pacing as an effective adjunctive method for terminating AV tachycardia in patients with identifiable left-sided accessory pathways (Evidence: Moderate) 3.References
1 Reddy VY, Jongnarangsin K, Albert CM, Sabbour H, Keane D, Mela T et al.. Para-Hisian entrainment: a novel pacing maneuver to differentiate orthodromic atrioventricular reentrant tachycardia from atrioventricular nodal reentrant tachycardia. Journal of cardiovascular electrophysiology 2003. link
2 Sreeram N, Smeets JL, Pulles-Heintzberger CF, Wellens HJ. Radiofrequency catheter ablation of accessory atrioventricular pathways in children and young adults. British heart journal 1993. link
3 Gang ES, Peter T, Nalos PC, Meesmann M, Karagueuzian HS, Mandel WJ et al.. Subthreshold atrial pacing in patients with a left-sided accessory pathway: an effective new method for terminating reciprocating tachycardia. Journal of the American College of Cardiology 1988. link91525-2)
4 Webb SC, Krikler DM, Hendry WG, Adrian TE, Bloom SR. Electrophysiological actions of somatostatin on the atrioventricular junction in sinus rhythm and reentry tachycardia. British heart journal 1986. link