Overview
Paroxysmal junctional tachycardia (PJT) is characterized by rapid, often irregular narrow complex tachycardia, sometimes with atrioventricular (AV) dissociation, typically due to abnormal automaticity or triggered activity. It can lead to significant symptoms and potentially heart failure if incessant 1.Diagnosis
Key Diagnostic Criteria: Rapid, narrow complex tachycardia; episodes of AV dissociation may occur 1.
Recommended Tests: Electrophysiologic study to assess presence of ventriculoatrial (VA) conduction during tachycardia 1.
Grading: Clinical assessment followed by invasive electrophysiologic testing for definitive diagnosis 1.Management
First-Line Treatments:
- Adenosine Triphosphate (ATP): Initial dose of 10 mg IV over 1 second; repeat with 20 mg if necessary 2.
- Verapamil: Initial dose of 5 mg IV over 15 seconds; repeat with another 5 mg if needed 2.
Adjunctive Treatments:
- Radiofrequency Ablation:
- If VA conduction present, target earliest retrograde atrial activation site 1.
- If VA conduction absent, sequential lesions in posterior septum, midseptum, and anteroseptum 1.
- AV Junction Ablation with Pacemaker: Considered as a last resort if other methods fail 1.Special Populations
No Specific Guidance Provided: Abstracts do not cover pregnancy, pediatrics, elderly, or specific comorbidities 12.Key Recommendations
Assess VA conduction during tachycardia to guide radiofrequency ablation strategy (Evidence: Moderate) 1.
Use ATP (10 mg initially, up to 20 mg total) and verapamil (5 mg initially, up to 10 mg total) sequentially for acute termination of PRJT (Evidence: Moderate) 2.
Consider radiofrequency ablation targeting the earliest retrograde atrial activation site if VA conduction is present; otherwise, proceed with septal ablation pathways (Evidence: Expert opinion) 1.References
1 Hamdan MH, Badhwar N, Scheinman MM. Role of invasive electrophysiologic testing in the evaluation and management of adult patients with focal junctional tachycardia. Cardiac electrophysiology review 2002. link
2 Belhassen B, Glick A, Laniado S. Comparative clinical and electrophysiologic effects of adenosine triphosphate and verapamil on paroxysmal reciprocating junctional tachycardia. Circulation 1988. link