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3.
CJC Open ; 1(6): 316-323, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32159126

RESUMO

BACKGROUND: Endocardial lead in the right ventricle is recognized as a cause for tricuspid regurgitation (TR), but the mechanism remains elusive. We sought to evaluate lead-specific features on the development of TR after endocardial lead implantation. METHODS: This was a prospective single-center study. The patients underwent 2-dimensional echocardiograms before endocardial lead implantation and at follow-up visits at 4 to 6 weeks, 6 months, and 12 months. We assessed the position of the endocardial lead at the tricuspid annulus by 3-dimensional echocardiography, the tricuspid leaflet interference by the endocardial lead by both 2- and 3-dimensional echocardiography, and the degree of lead slack radiologically. Patient characteristics and lead-related factors were evaluated in the prediction of new or worse TR by univariable and multivariable analyses. RESULTS: New or increased TR was detected in 38 of 128 patients at the 12-month follow-up. The postero-septal commissure was the most common lead position, and tricuspid leaflet interference detected in 21 patients was associated with a noncommissural lead position. The implantation of an implantable cardioverter defibrillator lead was not associated with new TR compared with the implantation of a pacemaker lead. Tricuspid leaflet interference (P < 0.0001), but not lead position or lead slack, was the only lead-specific factor associated with the development of TR. CONCLUSION: After right ventricle endocardial lead implantation, leaflet interference determined by echocardiography, but not the nature of the lead, the lead position at the tricuspid annulus, and the radiological lead slack, predicted TR development at 1 year postimplantation.


CONTEXTE: Il est établi que la présence d'une sonde endocavitaire dans le ventricule droit est une cause de régurgitation tricuspide (RT), mais le mécanisme en cause n'est pas encore bien compris. Nous avons tenté d'évaluer la corrélation entre certaines caractéristiques des sondes et l'apparition d'une RT secondaire à l'implantation d'une sonde endocavitaire. MÉTHODOLOGIE: Il s'agit d'une étude prospective menée dans un seul centre. Une échocardiographie bidimensionnelle a été réalisée avant la mise en place d'une sonde endocavitaire, ainsi qu'aux visites de suivi menées 4 à 6 semaines, 6 mois et 12 mois après l'intervention. Nous avons évalué la position de la sonde endocavitaire par rapport à l'anneau tricuspidien par échocardiographie tridimensionnelle, l'interférence de la sonde avec la valve tricuspide par échocardiographie bidimensionnelle et tridimensionnelle, et le degré de liberté de mouvement de la sonde par radiographie. Les caractéristiques des patients et les facteurs liés à la sonde ont été pris en compte dans la prédiction du risque de RT nouvelle ou d'aggravation d'une RT existante au moyen d'analyses univariées et multivariées. RÉSULTATS: Une RT nouvelle ou aggravée a été détectée au suivi à 12 mois chez 38 des 128 patients. Dans la plupart des cas, la sonde se trouvait à la commissure postéroseptale; chez 21 patients, une interférence avec la valve tricuspide a été détectée alors que la sonde ne se trouvait pas à la commissure. La mise en place d'une sonde de défibrillateur implantable n'a pas été associée à l'apparition d'une RT, comparativement à l'implantation d'une sonde de stimulateur cardiaque. L'interférence avec la valve tricuspide (p < 0,0001) était le seul facteur lié à la sonde associé à l'apparition d'une RT; aucun lien n'a été établi avec la position et le degré de liberté de mouvement de la sonde. CONCLUSION: Après la mise en place d'une sonde endocavitaire dans le ventricule droit, l'interférence avec la valve tricuspide établie par échocardiographie permettait de prédire l'apparition d'une RT dans l'année suivant la mise en place de la sonde sans égard au type de sonde, à sa position par rapport à l'anneau tricuspidien ou à la liberté de mouvement détectée par radiographie.

5.
Europace ; 17(6): 877-83, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25618742

RESUMO

AIM: After pulmonary vein isolation (PVI), dormant conduction (DC) is present in at least one vein in a substantial number of patients. The present study seeks to determine whether there is a relationship between poor contact forces (CF) and the presence of DC after PVI. METHODS AND RESULTS: This prospective, operator-blinded, non-randomized dual-centre trial enrolled 34 consecutive patients with paroxysmal atrial fibrillation who were candidates for PVI. Radiofrequency (RF) energy was delivered by using an irrigated-tip force-sensing ablation catheter (Tacticath, St Jude Medical) at pre-defined target power. The operators were blinded to the CF data at all times. A total of 1476 RF applications were delivered in 743 pre-defined PV segments. For each application, the precise location of the catheter was registered and the following data were extracted from the Tacisys unit: application duration, minimum contact force, maximum contact force, average contact force (CF), and force-time integral (FTI). Sixty minutes after PVI, spontaneous early recovery (ER) of the left atrium (LA) to PV conduction was evaluated. In the absence of ER, the presence of a DC was evaluated by using intravenous adenosine (ATP). In the 34 patients recruited (23 males; mean age: 62 ± 9 years), all PVs were successfully isolated. At the end of the 60 min waiting period, 22 patients demonstrated at least one spontaneous ER or DC under ATP. The mean CF and FTI per PV segment differed significantly among the different veins but the sites of ER and DC were evenly distributed. However, both the minimum, the first and the mean CF and FTI per PV segment were significantly lower in the PV segments presenting either ER or DC as compared with those without ER or DC (mean CF: 4.9 ± 4.8 vs. 12.2 ± 1.65 g and mean FTI: 297 ± 291 vs. 860 ± 81 g s, P < 0.001 for both). Using multivariate analysis, both the mean CF and the FTI per lesion remained significantly associated with the risk of ER or DC. Moreover, a CF < 5 g per PV segment predicted ER+ and DC+ with a sensitivity of 71% and specificity of 82%. In contrast, ER and DC were very unlikely if RF application was performed with a mean CF > 10 g (negative predictive value: 98.7%). CONCLUSION: Both a low CF and a low FTI are associated with the ER of the PVI and DC after PVI.


Assuntos
Adenosina , Antiarrítmicos , Fibrilação Atrial/cirurgia , Ablação por Cateter/métodos , Veias Pulmonares/cirurgia , Adulto , Idoso , Estudos de Coortes , Feminino , Sistema de Condução Cardíaco/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Veias Pulmonares/fisiopatologia , Método Simples-Cego , Resultado do Tratamento
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