Petr Parizek

Precordial thump efficacy in termination of induced ventricular arrhythmias.

INTRODUCTION Reports about the efficacy of precordial thump (PT) in the termination of ventricular arrhythmias (VA) vary widely. Very little recent data about the mechanical termination of VA induced during programmed ventricular stimulation are available. METHODS We prospectively studied 485 consecutive patients (May 2001 to December 2007) who underwent electrophysiology study with programmed ventricular stimulation as part of their assessment for primary or secondary prevention of sudden cardiac death. In cases of induction of sustained non-tolerated VA, one of two experienced cardiologists applied a precordial thump for termination of these arrhythmias immediately after the onset of unconsciousness. When PT was ineffective, the arrhythmia was terminated by electrical cardioversion. Tolerated VA was terminated by antitachycardic pacing. RESULTS Sustained VA was induced in 237 patients. In 82 patients with tolerated VA, overdriving was used successfully. Sustained induced VA was not tolerated in 155 patients (mean age 64 years (32-82), 133 males and 22 females, 126 patients with coronary artery disease, left ventricular ejection fraction 30+/-11%). Mean RR interval of induced VA was 226+/-47ms. Mean time to termination of arrhythmia (by PT or DC shock) was 26s (12-280s). PT terminated VA (polymorphic ventricular tachycardia) in only two patients; in 153 patients (98.7%), PT was ineffective. We did not observe any complication of PT application. CONCLUSION Efficacy of PT in termination of induced non-tolerated VA is very low even with early application after VA onset.

Bland–White–Garland syndrome in adults: sudden cardiac death as a first symptom and long-term follow-up after successful resuscitation and surgery

Two cases (a 23-year-old man and a 33 year-old-woman) with Bland-White-Garland (BWG) syndrome (an anomalous origin of the left coronary artery from the pulmonary artery) are presented. Their first symptom was survived sudden cardiac death. Both patients underwent surgical repair. One patient received an implantable defibrillator because of serious structural changes in the left ventricle and symptomatic non-sustained ventricular tachycardia; the second patient is free of therapy. During long-term follow-up (10.5 and 4.5 years, respectively), ventricular tachyarrhythmias did not recur. Both cases show good long-term prognosis in resuscitated adult patients after surgical repair for BWG syndrome regardless of the presence of structural changes.

High-sensitivity troponin T as a marker of myocardial injury after radiofrequency catheter ablation.

Background The aim of our study was to monitor radiofrequency catheter ablation-induced myocardial damage by measuring high-sensitivity cardiac troponin T (hs-cTnT). Methods Serum concentrations of hs-cTnT (Elecsys 2010 system, Roche) were measured in 73 healthy blood donors and serially in 27 patients who had samples taken both before and 24 h after radiofrequency ablation (RFA) for atrioventricular nodal re-entry tachycardia (AVNRT), atrial fibrillation (AF) or right atrial flutter (AFL). Results Significant increases of hs-cTnT were seen in patients after RFA (AVNRT: P = 0.0115, AF: P = 0.0011, AFL: P = 0.0009). Postprocedural serum hs-cTnT correlated with the number of radiofrequency applications and with the duration of RFA procedure. Spearmans coefficient of rank correlation (r) were as follows: hs-cTnT versus RFA duration: r = 0.771 (P < 0.001); hs-cTnT versus number of pulses: r = 0.708 (P < 0.001). Patients with the diagnosis of AVNRT had lower serum hs-cTnT concentration after RFA compared with AFL (P < 0.0001) and AF (P < 0.0001) patients. Conclusions Our data indicate that RFA causes a significant increase of serum hs-cTnT concentration that could be used to monitor myocardial injury.

Thoracoscopic Radiofrequency Ablation for Lone Atrial Fibrillation: Box‐Lesion Technique

We report the feasibility and outcomes of box‐lesion ablation technique to treat stand‐alone atrial fibrillation (AF).

Cavotricuspid Isthmus Catheter Ablation Across an Inferior Vena Cava Filter

Patients who suffer from recurrent thromboembolic events often receive an inferior vena cava (IVC) filter. There are few data available regarding treatment of this patient population with catheterization interventions, especially catheter ablation. We report a case of cavotricuspid isthmus catheter ablation across an IVC filter.

Longterm remission of left posterior fascicular ventricular tachycardia due to mechanical trauma

We present a case of a 28 year old woman with paroxysmal left posterior fascicular ventricular tachycardia (LPFVT). Ventricular tachycardia was not inducible after completing of left ventricle 3D reconstruction. Even though catheter ablation was not performed, no LPFVT recurrence has been documented during 60 months follow-up. We surmise that we caused mechanical trauma during the mapping of the posterior fascicle that damaged arrhythmogenic structures and subsequently led to long term remission of the left posterior fascicular ventricular tachycardia.

Midterm outcomes of mini-invasive surgical and hybrid ablation of atrial fibrillation

BACKGROUND We evaluated the feasibility and effectiveness of thoracoscopic and a staged surgical and transcatheter ablation technique to treat stand-alone atrial fibrillation (AF). METHODS . Between 2009 and 2016, a cohort of 65 patients underwent bilateral totally thoracoscopic ablation of symptomatic paroxysmal AF (n=30; 46%), persistent AF (n=18; 28%) or long-standing persistent AF (n=17; 26%) followed by catheter ablation in case of AF recurrence. Surgical box lesion procedure included bilateral pulmonary vein and left atrial posterior wall ablation using irrigated bipolar radiofrequency with documentation of conduction block. RESULTS There were no intra- or peri-operative ablation-related complications. There was no operative mortality, no myocardial infarction, and no stroke. Skin-to-skin procedure time was 120.5 ± 22.0 min and the postoperative average length of stay was 8.1 ± 3.0 days. At discharge, 60 patients (92%) were in sinus rhythm. Median follow-up time was 866 days (IQR, 612-1185 days). One-year success rate after surgical procedure was 78% (off antiarrhythmic drugs). Eleven patients (17%) underwent catheter re-ablation. Sixty (92%) patients were free of atrial fibrillation after hybrid ablation (on demand) at 1 year follow up after the last ablation. The success at 24-months was achieved in 96% (paroxysmal) and 78% (persistent) patients. At the last follow-up control, 69% patients discontinued oral anticoagulant therapy. CONCLUSIONS . Combination of mini-invasive surgical and endocardial treatment (two-stage hybrid procedure) is a safe and effective method for the treatment of isolated (lone) AF. This procedure provided good midterm outcomes.

Increase of serum interleukin 6 and interferon γ is associated with the number of impulses in patients with supraventricular arrhythmias treated with radiofrequency catheter ablation.

BACKGROUND Activation of the immune system plays a pathogenic role in the process of myocardial remodeling in patients with supraventricular arrhythmias. The intensity of this process is associated with the effectiveness of electrical cardioversion and radiofrequency catheter ablation (RFA). The aim of this study was to test the ability of the biochip microarray to detect immune parameters in patients with supraventricular arrhythmias undergoing RFA treatment. METHODS We used a biochip-based microarray system to determine multiple immune parameters in a group of 35 patients who had undergone RFA for atrioventricular nodal reentry tachycardia (AVNRT), atrial flutter (AFL) and atrial fibrillation (AF). RESULTS Before the procedure, serum IL-6 and VEGF levels were significantly increased in patients with atrial fibrillation compared to patients with AVNRT (IL-6: 6.4±6.3 ng/L vs. 1.5±0.7 ng/L, P < 0.01; VEGF: 132.4±74 ng/L vs. 88.5±56.4 ng/L, P < 0.01). After the procedure, serum IL-6, VEGF, IFN-γ and MCP-1 levels significantly increased compared to baseline (IL-6: 5.2±4.8 ng/L vs. 2.9±2.1 ng/L, P < 0.01; VEGF: 195.8±160 ng/L vs. 119.8± 110 ng/L, P < 0.05; IFN-γ: 3.1±1.2 ng/L vs. 2.3±0.6 ng/L, P < 0.05; MCP-1: 104.1±84.5 ng/L vs. 54.5±50 ng/L, P < 0.05). Serum IL-6 and IFN-γ were associated with the number of RFA applications (IL-6: r = 0.56, n 33; IFN-γ: r = 0.47, n 33). CONCLUSIONS This study showed that biochip-based microarray can be useful in the detection of immune activation in patients with arrhythmias and can detect myocardial injury after RF procedures.

False image of left ventricular diverticulum caused by local hypertrophy.

for catheter ablation of permanent atrial fibrillation. His medical history was insignificant apart from palpitations, dyspnoea and exertional angina pectoris. Left atrial dilatation (51∞∞mm) and mild mitral regurgitation were documented on cardiac ultrasound. A left atrial catheter ablation procedure was performed, utilizing electroanatomical CARTO mapping (Biosense Webster, Diamond Bar, California, USA), circumferential lesions around the pulmonary vein ostia, and linear lesions. Sinus rhythm was restored. FOCUS

320 Early isthmus conduction recovery in atrial flutter ablation

10 patients after remote MI (7 male, mean age 554-17 years), with at least 1 hemodynamically stable VT, were studied during SR. Signals within low vokage areas exceeding the reference value for duration were annotated as area of interest and related to successful ablation sites of the induced VTs. Results: in normal hearts, 95% of all recorded electrograms (n=878) was _> 1 mV with a duration _ 39 ms were defined as prolonged, low vokage signals were defined as electrograms with an amplitude 40 ms. The mean amplitude of these signals was 0.84-0.6 mV. The prolonged and low amplitude electrograms were confined to circumscribed areas (2.24-0.6 areas of interest per patient). 27/28 targeted VTs were subsequently terminated and remained non-inducible after RF application within these areas. Conclusion: the resuks of this study demonstrate that target sites for RF ablation of VT can be identified during SR based on signal amplitude and duration.