Safety and outcome of very high-power short-duration ablation using 70 W for pulmonary vein isolation in patients with paroxysmal atrial fibrillation.

AIMS: Pulmonary vein isolation (PVI) using radiofrequency ablation (RFA) in patients with paroxysmal atrial fibrillation (PAF) is effective but hampered by pulmonary vein reconnection due to insufficient ablation lesions. High-power delivery over a short period of time (HPSD) in RFA is stated to create more efficient lesions. The aim of this study was to compare intraprocedural safety and outcome of HPSD ablation to conventional power settings in patients undergoing PVI for PAF. METHODS AND RESULTS: We included 197 patients with PAF that were scheduled for PVI. An ablation protocol with 70 W and a duration cut-off of 7 s at the anterior left atrium (LA) and 5 s at the posterior LA (HPSD group; n = 97) was compared to a conventional power protocol with 30-40 W for 20-40 s (standard group; n = 100) in terms of periprocedural complications and a 1-year outcome. The HPSD group showed significantly less arrhythmia recurrence during 1-year follow-up with 83.1% of patients free from atrial fibrillation compared to 65.1% in the standard group (P < 0.013). No pericardial tamponade, periprocedural thromboembolic complications, or atrio-oesophageal fistula occurred in either group. Mean radiofrequency time (12.4 ± 3.4 min vs. 35.6 ± 12.1 min) and procedural time (89.5 ± 23.9 min vs. 111.15 ± 27.9 min) were significantly shorter in the HPSD group compared to the standard group (both P < 0.001). CONCLUSION: High-power short-duration ablation demonstrated a comparable safety profile to conventional ablation. High-power short-duration ablation using 70 W for 5-7 s leads to significantly less arrhythmia recurrences after 1 year. Radiofrequency and procedural time were significantly shortened.

Catheter ablation of left atrial arrhythmias on uninterrupted oral anticoagulation with vitamin K antagonists: What is the relationship between international normalized ratio, activated clotting time, and procedure-related complications?

BACKGROUND: Ablation of atrial fibrillation (AF) on uninterrupted phenprocoumon reduces periprocedural thromboembolic and bleeding complications. Heparin is administered intraprocedurally to achieve activated clotting times (ACT) of 300-400 seconds. We investigated the effect of international normalized ratio (INR) on ACT and intraprocedural heparin requirements. Moreover, safety of a target ACT of 250-300 seconds was investigated. METHODS AND RESULTS: We studied 949 patients referred for AF or left atrial tachycardia ablation. Patients were divided into Group 1 (n = 249) with an INR <2 and Group 2 (n = 700) with an INR ≥2. Mean INR was 1.7 ± 0.13 in Group 1 and 2.3 ± 0.25 in Group 2. Baseline, mean, minimum and maximum ACT were significantly lower in Group 1 (138 ± 17 seconds vs. 145 ± 21 seconds; 281 ± 28 seconds vs. 288 ± 29 seconds; 251 ± 36 seconds vs. 258 ± 34 seconds; 307 ± 32 seconds vs. 316 ± 40 seconds; P <0.05). Intraprocedural heparin requirements adjusted to body weight were lower in Group 1 (127 ± 41 U/kg vs. 122 ± 40 U/kg). Weak correlations between INR and baseline, mean, minimum and maximum ACT as well as intraprocedural heparin requirements were observed. No differences regarding major or minor complications were found. INR and periprocedural anticoagulation parameters had no influence on major complications. No thromboembolic complications were observed in both groups with a target ACT value of 250-300 seconds. CONCLUSIONS: There is only a weak correlation between INR, intraprocedural ACT, and intraprocedural heparin requirements. Periprocedural target ACT of 250-300 seconds seems safe and does not increase periprocedural bleeding and thromboembolic complications in patients undergoing RF ablation on uninterrupted phenprocoumon therapy.

Atrial fibrillation ablation in adults with congenital heart disease on uninterrupted oral anticoagulation is safe and efficient.

BACKGROUND: The prevalence of atrial fibrillation (AF) is significantly higher in adults with congenital heart disease (ACHD) compared to patients without congenital heart disease (CHD). As AF in ACHD patients might have significant hemodynamic consequences, rhythm control is particularly desirable but rarely achieved by antiarrhythmic drugs. The aim of this study was to investigate safety and long-term outcome of AF ablation in ACHD patients. METHODS: All ACHD patients (n = 46) that underwent AF ablation at our centre from 2013 to 2017 were included in the study. CHD was classified as simple (46%), moderate (41%) or complex (13%). The majority of patients (61%) suffered from persistent AF (paroxysmal AF 39%). Persistent AF was present in 57% of patients with simple, in 58% of patients with moderate and 83% of patients with complex CHD. All patients underwent radiofrequency (RF) ablation on uninterrupted oral anticoagulation. Pulmonary vein isolation (PVI) was performed in patients with paroxysmal AF, whereas patients with persistent AF underwent PVI and ablation of complex fractionated atrial electrograms (CFAE). RESULTS: No major complications occurred. Single-procedure success after 18 months off antiarrhythmic drugs was 61% for paroxysmal AF and 29% for persistent AF (p = 0.003). Multiple procedures (mean 2.1 ± 1.4) increased long-term success to 82% for paroxysmal AF and 48% for persistent AF (p = 0.05). Long-term ablation success was 64% for simple, 62% for moderate and 50% for complex CHD patients. CONCLUSIONS: AF ablation in ACHD patients is feasible and safe regardless of CHD complexity. Success rates in patients with paroxysmal AF are high and comparable to patients without CHD. In ACHD patients with persistent AF, success rates of ablation are markedly reduced which might be due to a different and/or more extensive (bi-)atrial substrate. In the cohort of complex ACHD patients with persistent AF as the dominant AF type, long-term success of AF ablation is limited.

Exclusion of left atrial thrombus by dual-source cardiac computed tomography prior to catheter ablation for atrial fibrillation.

OBJECTIVES: Thromboembolic complications during atrial fibrillation (AF) ablation due to mobilisation of a pre-existing thrombus formation (TF) in the left atrium (LA) are devastating. The gold standard to exclude LA TF is transesophageal echocardiography (TEE). The present study compares sensitivity and specificity of a dual-source cardiac-computed tomography (DS-CT) with TEE for TF exclusion prior to AF ablation. In addition, CT protocols with and without ECG synchronized were evaluated. METHODS: In 622 patients, DS-CT as well as TEE to exclude TF was performed less than 48 h prior to AF ablation. Mean age of patients was 60 ± 10 years (69% males, 61% paroxysmal AF). During DS-CT, 280 patients (45%) were in AF. An ECG-synchronized DS-CT was performed in 332 patients, whereas 290 patients underwent DS-CT without ECG synchronization. RESULTS: In all patients without suspected TF on DS-CT (n = 552; 88.7%), no thrombus was found on TEE. A TF was suspected on DS-CT in 70 patients, of whom only three patients showed TF on TEE. No TF was detected in the other 67 patients (Fig. 1). Overall, sensitivity for TF detection in DS-CT was 100% and specificity was 89.2% (positive predictive value 4.3%, negative predictive value 100%). The CT protocol (ECG-synchronized versus non-ECG-synchronized) had no significant influence on diagnostic accuracy. Mean dose length product during DS CT was 282 ± 287 mGy cm (synchronized) versus 136 ± 55 mGy cm (non-synchronized) with p < 0.0001. CONCLUSIONS: DS-CT is a highly sensitive method for LA thrombus detection in patients undergoing AF ablation. It delivers additional anatomic details of pulmonary veins and LA anatomy with an acceptable radiation exposure. Non-ECG-synchronized DS-CT showed a significantly lower radiation exposure, whereas diagnostic accuracy was comparable. Therefore, DS-CT might serve as primary method to exclude LA TF in patients undergoing AF ablation.

Safety of Uninterrupted Periprocedural Edoxaban Versus Phenprocoumon for Patients Who Underwent Left Atrial Catheter Ablation Procedures.

Data about the safety of edoxaban in patients who underwent left atrial (LA) radiofrequency (RF) ablation procedures are lacking. This study sought to compare the safety of uninterrupted edoxaban with uninterrupted phenprocoumon administration during LA RF ablation for atrial fibrillation and atrial tachycardia. In total, 231 patients (mean age 64 ± 11years, male 71%) who underwent LA RF ablation under continuous oral anticoagulation (OAC) with edoxaban or phenprocoumon were included in the study. Patients on uninterrupted edoxaban (60 mg or 30 mg/day for at least 4 weeks) were matched for gender, age and type of arrhythmia with 2 patients on uninterrupted phenprocoumon (international normalized ratio 2 to 3). We identified 77 consecutive patients on edoxaban and n = 154 patients on phenprocoumon. Heparin was administered periprocedurally to achieve an activated clotting time of 280 to 300 seconds. No protamine was administered periprocedurally. The primary end point was a composite of bleeding, thromboembolic events, and death. The primary end point was met in 9 patients in the edoxaban group and in 22 patients in the phenprocoumon group (p = 0.69). No patient in either group died or had a thromboembolic complication. No major bleeding complication was observed in the edoxaban group, whereas one was found in 1 patient in the phenprocoumon group (p ≥0.99). Minor bleeding complications occurred in 9 patients (12%) in the edoxaban group and in 21 patients (14%) in the phenprocoumon group (p = 0.84). Uninterrupted OAC with edoxaban appeared to be as safe as uninterrupted OAC with phenprocoumon in patients who underwent LA RF ablation procedures.

Mannose-binding lectin in obesity with different degrees of metabolic syndrome abnormalities: association with atherogenic and metabolic traits.

AIM: In subjects with metabolic syndrome (MetS) endothelial dysfunction is a very consistent finding. Processes leading to endothelial dysfunction and atherosclerosis involve the altered control of subclinical inflammation by innate immune defenses that possibly include mannose-binding lectin (MBL). We investigated the associations of MBL with traits of MetS and early atherosclerosis in obese subjects before and after marked weight reduction. METHODS: In a prospective longitudinal study, MBL concentrations of 96 severely obese subjects with and without MetS (Ø BMI with MetS 41.0±7.9 kg/m(2), Ø BMI without MetS 39.4±7.7 kg/m(2) were examined in association with markers of insulin resistance, dyslipidemia, adipokines, and subclinical atherosclerosis before and after marked weight loss (Ø weight loss 20±8 kg after 3 months of participation in a standardized weight reduction program), in addition to the study of 25 seemingly healthy lean subjects (BMI 20-25 kg/m(2). RESULTS: MBL concentrations did not differ between healthy lean and severely obese subjects independently of the presence of metabolic abnormalities. In severely obese subjects there was no significant difference concerning the cardiovascular risk profile, apolipoproteins, inflammatory and metabolic parameters, and markers of endothelial dysfunction and atherosclerosis between subjects with functional MBL deficienct (MBL<778 ng/mL) and MBL sufficient (MBL≥778 ng/mL) obesity. Marked weight loss did not influence MBL levels. CONCLUSIONS: Our findings suggest that plasma levels of MBL did not differ between healthy lean and severely obese subjects. MBL did not affect cardiovascular risk factors, or markers of endothelial dysfunction and early atherosclerosis in severely obese patients before and after marked weight loss.

Growth-differentiation factor-15 improves reclassification for the diagnosis of heart failure with normal ejection fraction in morbid obesity.

AIMS: This study aimed to examine the incremental value of growth-differentiation factor-15 (GDF-15) to N-terminal pro brain natriuretic hormone (NT-proBNP) levels for the diagnosis of left ventricular diastolic dysfunction (LVDD) and possible heart failure (HF) in morbidly obese patients. Method and results We analysed data from 207 obese subjects [body mass index (BMI) 41 ± 8 kg/m(2)] with normal ejection fraction, LVDD, and symptoms and/or signs of HF (referred to as 'LVDD with possible HF', n = 88) and with normal left ventricular function (n = 119) before participating in a medical weight loss programme, in addition to the study of healthy lean subjects (n = 51). Median NT-proBNP (interquartile range) for obese subjects with 'LVDD and possibe HF' and with normal LV function was 52 (29-96) and 42 (25-66) pg/mL, respectively (P = 0.12). There was no correlation of NT-proBNP with parameters of left ventricular filling pressure, i.e. E/E' (r(2) = 0.002, P = 0.63) or E' velocity (r(2) = 0.02, P = 0.24). In contrast, GDF-15 was 665 (496-926) with 'LVDD and possible HF' and 451 (392- 679) pg/mL without (P < 0.0001). GDF-15 was significantly correlated to E/E', E' velocity, E/A ratio, isovolumetric relaxation time, duration of reversed pulmonary vein atrial systolic flow, and left atrial size. The area under the receiver operating characteristic curve that defines LVDD with possible HF was 0.56 for NT-proBNP and 0.74 for GDF-15 (P < 0.0001). The addition of GDF-15 to a multivariate predicition model increased the net reclassification improvement (NRI) by 9% (P= 0.022). CONCLUSION: In morbidly obese individuals, GDF-15 levels seem to better correlate with diastolic dysfunction than NT-proBNP levels. GDF-15 significantly improves reclassification for the diagnosis of 'LVDD with possible HF' and, thus, adds incremental value to NT-proBNP.