Pathology after a combination of sequential and simultaneous unipolar radiofrequency ablation of ventricular tachycardia in a postmortem heart with cardiac sarcoidosis

Comparison of two needle versus one needle lesioning techniques for thoracic medial branch neurotomy

Background and objectives

No prior studies have investigated an assumed advantage of creating a radiofrequency strip lesion for posterior element spinal axial pain using a two-needle technique (TNT) compared to a one-needle technique (ONT) that creates a single ovoid lesion. We explore the relationship of TNT compared to ONT on the magnitude and duration of pain relief following thoracic medial branch neurotomy (TMBN).

Methods

This study is a retrospective audit of consecutive patients treated with TMBN at a single site and interventionalist over ten years (2007-2017). All patients had undergone TMBN after failed conservative care and, with few exceptions, patient-reported ≥ 70% pain relief after thoracic medial branch block (TMBB). All patients had TMBN performed with a medial to lateral (MLA) radiofrequency cannula approach using either an ONT or TNT technique. We used parametric and nonparametric statistics and three levels of case analysis to assess for intergroup differences.

Results

Thirty-five consecutive patients underwent their primary TMBN, and two underwent both on a subsequent repeat using the MLA approach, 19 using the ONT, 18 using the TNT. The TNT group had clinically and statistically greater pain relief magnitude and duration than the ONT subgroup. The difference resulted in non-overlapping 95% confidence intervals for both percent pain relief and duration of pain relief using three levels of case analysis.

Conclusion

The comparison of TMBN techniques demonstrates a statistically significant separation of TNT to ONT sample mean values for magnitude and duration of pain relief when using TNT compared to ONT for TMBN using an MLA.

Malignant Ventricular Tachycardia, Ventricular Wall Ablation, and Orthotopic Heart Transplantation

Described herein are three patients with refractory ventricular tachycardia and one or more unsuccessful ablation procedures finally leading to orthotropic heart transplantation (OHT). The latter procedure allowed examination of the ventricular ablation sites, an unusual opportunity reported previously in few patients (all case reports). The acute ablation lesions are unique, with necrosis of the myocardial fibers adjacent to the endocardium and encircled by layers of extravasated erythrocytes in the deeper myocardial wall. All 3 patients returned to normal activities following the OHT.