Visualization of pulmonary vein reconnections using dynamic mapping in redo procedures for patients with atrial fibrillation

Funding Acknowledgements

Type of funding sources: None.

Background/Introduction

Pulmonary vein (PV) reconnection is commonly associated with recurrence of atrial fibrillation (AF) after the initial catheter ablation procedure. Visualization and identification of PV reconnections are critical during repeat procedures.

Purpose

To examine the use of dynamic mapping (LiveView) in combination with a high-density mapping catheter (HD Grid) in the recognition of PV reconnections in redo AF ablation procedures.

Methods

Acute procedure data from 81 patients were prospectively collected. Mapping catheter selection and the use of LiveView was determined at the physician’s discretion. For cases where LiveView was used, the location and number of gaps from the previous procedure were identified using both standard mapping and dynamic mapping separately.

Results

Most of the patients included in the analysis were treated for paroxysmal AF (PAF: n=63/81, 77.8%). Dynamic mapping data was incorporated in 50 PAF cases and 15 persistent AF cases. Within these 65 cases, standard mapping identified a total of 120 PV gaps whereas LiveView identified a total of 138 PV gaps; gaps were most frequently identified on the right PVs, especially in the anterior region (Table1). A contact force-sensing ablation catheter was commonly (n=64/81, 79%) used by the operators. The right anterior region was ablated with an average contact force of 13.8±3.1g and Lesion index (LSI) of 5.2±0.7 at a power of 35.8±8.4W. Non-PV ablation was performed in 38 (46.9%) patients; the most common lesion sets were roofline, cavotricuspid isthmus (CTI) line, and mitral isthmus line. Acute PV isolation was achieved in all patients at the end of the procedure.

Conclusion

Data from this analysis suggest the incorporation of dynamic mapping data may help reveal more PV reconnections compared to standard mapping. Additional study is needed to assess the long-term clinical outcomes when regional dynamic mapping data is used to identify PV reconnections in repeat procedures.

C6 IN VIVO CHIARI NETWORK REMOVAL. COMPLICATION OR INNOCENT SURPRISE

A 78 years old man was admitted to our hospital because of a syncope and evidence of complete AV– block, low ventricular rate and suitable for definitive PM implantation. He had no other pathologies or previous surgical interventions. A transthoracic echocardiography was performed and any particular structural anomaly was detected and the left ventricular ejection fraction was normal. In the electrophysiology laboratory, a vascular access through the left axillary vein was used to insert a passive fixation catheter for the right ventricular using a 9 F sheath. When the ventricular lead reached the right atrium it was impossible to advance it farther into the right ventricle; the lead was blocked near tricuspid anulus without any possibility to move it towards any direction despite many and vigorous manual traction maneuvers were attempted. Immediately, a transesophageal echocardiography was performed and it showed the lead entrapment into a mobile structure, likely a Chiari network.The patient needed a PM implantation as soon as possible and also a temporary PM could further complicate the procedure. Since the hospital did not have a cardiac surgery department and our crew was not familiar with lead extractions, an expert hemodynamist, who suggested to remove the lead by using a snare, was consulted. The tip of the lead was stuck in the atrial wall so it was impossible to capture it as expected. So, from right femoral vein access, a 6F pig–tail catheter was inserted through a a 45 cm– 8 F Terumo Destination sheath in order to give more stability to the pig–tail catheter until it hooked the lead. A 0.035 mm normal hydrophilic Terumo wire was later passed into the pig–tail catheter, snared and externalized with an AndraSnare 25 catheter inserted through another 6F introducer. A vigorous traction was performed simultaneously pulling both the ends of the wire from the bottom and the lead from the top. After a few seconds, the lead was unstuck and removed from the axillary vein [Fig. 1a,b]. At the external examination, the tines of the lead were found attached to a net–like structure that was actually the Chiari network that had been completely removed from the atrium [Fig 2–3]. A transthoracic echocardiogram ruled out any pericardial effusion. The anatomical finding was sent to tissue analysis and was confirmed to be the tendon material. After that the patient was immediately implanted with a VDD PM without any complications, and dismissed after 2 days.

P2882Sustainable organization of a management model for CIED remote control: data from a single tertiary center

Introduction

The remote control (RC) of CIED has become necessary, though the human resources and technical facilities needed are limited. In most of Centers, the ratio of RC CIED /CIED with in-office follow up, is continuously increasing and is expected to reach the 100% of CIED remotely controlled.

We sought assess an organizational model based on available facilities and a long-term projection of RC data burden. Pacemakers, ICD and implantable loop recorders were considered.

Methods

The total population served by the Hospital area has been obtained (271.260 citizens), timed at December 31st 2014. By checking our Hospital data files, the total number of followed up CIED patients timed at January 1st 2011 (3995; 1.47% of all population), was compared with the same data timed at January 1st 2015 (3902; 1.43% of all population), in order to the check for the “stability” of that data over time.

At the analyzed time 1582/3902 (40,5%) of CIED were followed by RC.

We have then considered an yearly average of 465 CIEDs implanted/replaced (yearly implants 2012 to 2015) and excluded a roughly 10% of them because not provided of RC facilities (unwilling patients or CIED not RC “ready”); all the other patients were provided with RC. On these basis, we can assume a ratio of RC CIEDs /non-RC CIED, deemed to increase by 10 to 11% per year, to reach the break-even of 100% of RC CIEDs, in 2021 (projection).

The number of RC transmissions (Tx) have been gathered in 5 types of events (Fig. left upper).

The timing of RC patient managing from opening the CIED web site to complete patient file assessment (RC file analysis) performed by expert nurses, was arbitrarily calculated over a sample of 10 Tx per day in 3 different days.

Results

Of 3902 CIED patient, 1582 (40.5%) were RC followed up (3261 pacemakers, 594 ICDs and 47 implantable loop recorder); the CIED brands were represented as follows: Medtronic 685 (43.3%); St. Jude 180 (11.4%), Boston Sc. 330 (20.8%), Biotronik 318 (20.1%) and Livanova (previously SorinGroup) 69 (4.4%).

During the year 2015 we received a total number of 10396 Tx: 128 (1.2%) red alert; 1944 (18.6%) yellow alert, 141 (1.3%) atrial fibrillation; 403 (3.9%) lost Tx (disconnected transmitters or un-compliant patients for remote interrogation) and 7780 (75%) Tx “OK” with NO events. (Fig. right upper).

The projection model at 2021 with 100% RC patients (break-even) shows a total 25990 Tx: 320 red alert; 1944 yellow alert, 352 atrial fibrillation; 1007 lost Tx and 19459 Tx “OK”. The 2021 monthly Tx would be 2320 (26 red alert; 405 yellow alert, 29 atrial fibrillation; 91 lost Tx and 1769 (75%) Tx “OK”) (Fig. both lower panels)

The RC file analysis was roughly calculated around 3 minutes (116 hours/month); 5.8 hours/business day (Monday–Friday).

Conclusion

The rate of RC followed up CIEDs will inexorably increase by time. The projection management model presented could help to build a sustainable organization.