Introduction: Rapid atrial pacing alters atrial electrophysiology, promoting initiation and maintenance of atrial fibrillation (AF). The aim of this study was to assess differences in the electrophysiologic properties of atrial tissue between patients with and without AF episodes and to determine whether electrophysiologic properties can predict the clinical efficacy of antiarrhythmic agents.
Methods And Results: Sixty patients were studied, 33 with documented episodes of paroxysmal atrial fibrillation (PAF) and 27 control patients. Atrial effective refractory period (AERP), atrial vulnerability, and intra-atrial conduction time were measured at baseline and after rapid constant atrial pacing for 5 minutes at rates of 130, 150, 170, and 190 beats/min. The clinical efficacy of antiarrhythmic agents for PAF prophylaxis was assessed over 14 months with an antiarrhythmic agent identical to that administered intravenously, and the antiarrhythmic agent effects on AERP, atrial vulnerability, and intra-atrial conduction time were assessed. AERP shortening and atrial vulnerability increase were significantly larger in the PAF group. Antiarrhythmic agents that were clinically effective in suppressing PAF significantly attenuated AERP shortening, but antiarrhythmic agents that were clinically ineffective did not.
Conclusion: Changes in AERP and atrial vulnerability observed after rapid atrial pacing are considered indicative of the electrophysiologic substrate of PAF. Attenuation of AERP and atrial vulnerability by antiarrhythmic agents might be useful in predicting their clinical efficacy.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1046/j.1540-8167.2004.03706.x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Initial treatment with a single capsule containing half-dose quadruple therapy vs standard-dose dual therapy in hypertensive patients (QUADUAL): a randomized, blinded, crossover trial.
BMC Med
January 2025
Department of Cardiology, The Third Xiangya Hospital of Central South University, Yuelu District, 138 Tongzipo Road, Changsha, 410013, Hunan, China.
Background: Guidelines recognized dual combination in initial antihypertensive therapy. Studies found that low-dose quadruple combination were superior to monotherapy. However, whether low-dose quadruple therapy is better than dual combination is unknown.
View Article and Find Full Text PDFThe efficacy of non-depolarizing muscle relaxant as adjuvants to local anesthesia in peribulbar block during cataract surgery.
Sci Rep
January 2025
Department of Ophthalmology, Faculty of Medicine for Girls, Al-Azhar University, Cairo, Egypt.
Peribulbar anesthesia is mainly used for cataract surgery. Many studies had used atracurium and rocuronium as an additive to the local anesthetic (LA) drugs in eye surgery. The aim of this study is to evaluate the efficacy of adding atracurium versus rocuronium to a local anesthetic mixture, in providing an early onset of orbital akinesia and corneal anesthesia during cataract surgery.
View Article and Find Full Text PDFEconomic impact of initial glaucoma treatment with selective laser trabeculoplasty on the Brazilian Public Health System.
Arq Bras Oftalmol
January 2025
Discipline of Health Management and Economics, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, Brazil.
Purpose: To evaluate the economic impact of the following initial treatment scenarios for glaucoma on the Brazilian Public Health System (SUS): (1) traditional continuous instillation of hypotensive eye drops and (2) single session of selective laser trabeculoplasty.
Methods: Economic impact was analyzed in three scenarios, from the least to the most conservative, for a hypothetical cohort of 5,000 individuals with open-angle glaucoma. Thereafter, projections were made on the basis of a glaucoma prevalence of 3% in the 2021 Brazilian population size.
[Effects of Efflux Pump Inhibitors and Antileishmanial Drug Combinations on Leishmania tropica and Leishmania infantum Isolates].
Mikrobiyol Bul
January 2025
Manisa Celal Bayar Üniversitesi Tıp Fakültesi, Tıbbi Parazitoloji Anabilim Dalı, Manisa.
İnsanlığın karşı karşıya kaldığı en önemli halk sağlığı sorunlarından biri olan ilaç direnci, antilayşmanyal ajan geliştirmede yeni stratejileri ve yaklaşımları zorunlu kılmaktadır. Dışa atım pompa inhibitörleri (DAPİ) ve diğer aday ajanlar ile ilgili gelişmeler umut verici olmakla birlikte, mevcut antilayşmanyallerin kullanım sürelerini ve etkinliklerini artırabilme arayışları da devam etmektedir. Bu çalışmada rezerpin (REZ), berberin (BER) ve verapamil (VER) olmak üzere üç adet DAPİ'nin antilayşmanyallere etkisinin araştırılması amaçlanmıştır.
View Article and Find Full Text PDFComparative Evaluation of 4% Articaine and 2% Lignocaine Anesthetic Agents in Children: A Split-mouth Randomized Control Trial.
J Contemp Dent Pract
October 2024
Department of Pedodontics and Preventive Dentistry, Sri Guru Ram Das Institute of Dental Sciences and Research, Sri Amritsar, Punjab, India.
Aim: The objective of the present study is to assess and compare the effectiveness of two different anesthetic agents, namely, 4% articaine and 2% lignocaine, in the extraction of primary molar teeth in children.
Materials And Methods: The study included 25 children requiring bilateral extractions of primary molar, with extraction performed on one side with 4% articaine and the contralateral side extraction with 2% lignocaine at two separate appointments. The anesthetic efficacy was evaluated objectively by assessing pain and the child's behavior at baseline, during injection and during extraction using the sound, eye, and motor (SEM) scale objectively, and subjectively using the faces pain rating scale (FPS).
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!