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Titolo:
Pacing during ventricular fibrillation: Factors influencing the ability tocapture
Autore:
Newton, JC; Huang, J; Rogers, JM; Rollins, DL; Walcott, GP; Smith, WS; Ideker, RE;
Indirizzi:
Univ Alabama, Dept Physiol & Biophys, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 & Biophys, Birmingham, AL 35294 USA Univ Alabama, Dept Med, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 , Dept Med, Birmingham, AL 35294 USA Univ Alabama, Dept Biomed Engn, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 iomed Engn, Birmingham, AL 35294 USA
Titolo Testata:
JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY
fascicolo: 1, volume: 12, anno: 2001,
pagine: 76 - 84
SICI:
1045-3873(200101)12:1<76:PDVFFI>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
EPICARDIAL ACTIVATION PATTERNS; ATRIAL-FIBRILLATION; EXCITABLE GAP; REFRACTORINESS; DEFIBRILLATION; STIMULATION; MYOCARDIUM; DOGS;
Keywords:
pacing; ventricular fibrillation; mapping;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Ideker, RE Univ Alabama, Dept Physiol & Biophys, B140 Volker Hall,1670 Univ Blvd, Birmingham, AL 35294 USA Univ Alabama B140 Volker Hall,1670 Univ Blvd Birmingham AL USA 35294
Citazione:
J.C. Newton et al., "Pacing during ventricular fibrillation: Factors influencing the ability tocapture", J CARD ELEC, 12(1), 2001, pp. 76-84

Abstract

Pacing During Ventricular Fibrillation. Introduction: Recent studies showed that pacing atrial and ventricular fibrillation (VF) is possible. The studies presented here determined which parameters influence the efficacy of apacing train to capture fibrillating ventricular myocardium. Electrode type, current strength, order of pacing trains, polarity, and VF morphology preceding the pacing trains were investigated. Methods and Results: A 504-electrode recording plaque sutured to the rightventricle of pig hearts was used to record the activations of VF and thoseresulting from the pacing stimulation. Capture of VF by pacing was determined by observing an animated display of the first temporal derivative of the electrograms. A series of electrodes in a line captured the heart more frequently during VF than did a point electrode. Increasing the current strength to 10x diastolic pacing threshold increased the incidence of capture, but increasing this strength further did not. The second or third train of 40 stimuli had greater capture rates than did the first train during the same VF episode. Anodal and cathodal unipolar, and bipolar stimulation were equally efficacious in capturing VF. VF activation during the 1-second interval preceding pacing was more organized for pacing trains that captured thanthose that did not, The highest incidence of capture, 46% to 61% of pacingtrains, occurred with a line of electrodes at 10x diastolic pacing threshold delivered by the second or third train. Conclusion: The probability of a pacing train capturing fibrillating myocardium can be influenced by the pacing protocol parameters.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/04/20 alle ore 23:55:00