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  1. Article ; Online: Pacing technology: advances in pacing threshold management.

    Lau, Chu-pak / Siu, Chung-wah

    Journal of Zhejiang University. Science. B

    2010  Volume 11, Issue 8, Page(s) 634–638

    Abstract: ... management in pacing threshold in the modern pacemakers. ... different automatic threshold management algorithm. This article summarizes the current state-of-the-art ... Over the last five decades, pacemaker therapy has undergone remarkable technological advances ...

    Abstract Over the last five decades, pacemaker therapy has undergone remarkable technological advances with increasing sophistication of pacemaker features. However, device longevity has remained one of the major issues in pacemaker design ever since the first endocardial pacing lead implantation in 1958. In addition to various hardware design to enhance device longevity, software-based solutions to minimize pacing energy and yet with good safety margin have also been developed. Together with desire and need of fully automatic pacing system in increasingly busy pacemaker clinic, several manufacturers have introduced different automatic threshold management algorithm. This article summarizes the current state-of-the-art management in pacing threshold in the modern pacemakers.
    MeSH term(s) Algorithms ; Automation ; Cardiac Pacing, Artificial/methods ; Cardiology/methods ; Electrodes, Implanted ; Endocardium/pathology ; Equipment Design ; Equipment Safety ; Humans ; Pacemaker, Artificial/trends ; Software
    Language English
    Publishing date 2010-07-28
    Publishing country China
    Document type Journal Article ; Review
    ZDB-ID 2247290-3
    ISSN 1862-1783 ; 1673-1581
    ISSN (online) 1862-1783
    ISSN 1673-1581
    DOI 10.1631/jzus.B1001016
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Biventricular pacing--early experience.

    Pires, R / Elvas, L / Monteiro, P / Cristóvão, J / Antunes, A / Ventura, M / Costa, M / Ermida, P / Providência, L A

    Revista portuguesa de cardiologia : orgao oficial da Sociedade Portuguesa de Cardiologia = Portuguese journal of cardiology : an official journal of the Portuguese Society of Cardiology

    2001  Volume 20, Issue 12, Page(s) 1235–1239

    Abstract: ... significant differences in the pacing threshold and impedance during the follow-up.: Conclusions: Patients ... in the management of severe CHF.: Methods: Between June 2000 and March 2001, 8 patients ... with advanced CHF and prolonged QRS duration.: Objective: To present our experience with biventricular pacing ...

    Abstract Introduction: Biventricular pacing has been studied for the treatment of chronic heart failure (CHF). This technique seems to be able to improve symptoms and exercise tolerance, in patients with advanced CHF and prolonged QRS duration.
    Objective: To present our experience with biventricular pacing in the management of severe CHF.
    Methods: Between June 2000 and March 2001, 8 patients with dilated cardiomyopathy and left bundle branch block (LBBB) were selected for transvenous biventricular pacing system implantation. Mean age: 54.12 +/- 16.8 years; 5 males. The etiology was: idiopathic in 6 cases; operated congenital heart disease in 1, and ischemic in the other. Despite tailored treatment of CHF (with all patients taking diuretics and angiotensin-converting enzyme inhibitors), 7 patients remained in NYHA class III and 1 in IV. The quality of life score (assessed by the "Minnesota living with heart failure questionnaire") was 62.25 +/- 11.29. Seven patients had sinus rhythm and only one chronic atrial fibrillation; mean PQ duration--220 +/- 76.37 ms; mean QRS duration--168.75 +/- 20.31 ms.
    Results: Implant failure, due to coronary sinus dissection and to excessive fluoroscopy time, with no coronary sinus catheterization, occurred in 2 cases (success rate: 75%). Implant data: mean implant procedure duration: 122.5 +/- 47.82 min; mean fluoroscopy time: 35.66 +/- 22.06 min; QRS duration, after implant: 133.33 +/- 15.05 ms. Left ventricular lead final position: anterolateral in 2 patients and lateral in 4. Pacing thresholds: biventricular--1.36 +/- 0.6 V; right ventricle--0.28 +/- 0.04 V; right atrium--0.32 +/- 0.08 V. Pacing impedance (left ventricle): 1013.33 +/- 147.87 omega. Follow-up (1st and 3rd month): one patient died, suddenly, 15 days after the procedure. In the others, an improvement in the quality of life index and functional class was found. These results were independent of echocardiography data. There were no significant differences in the pacing threshold and impedance during the follow-up.
    Conclusions: Patients with advanced CHF and widened QRS benefited from biventricular stimulation, in which improvement on the clinical status was evident.
    MeSH term(s) Adolescent ; Adult ; Aged ; Bundle-Branch Block/surgery ; Cardiac Pacing, Artificial ; Cardiomyopathy, Dilated/surgery ; Female ; Humans ; Male ; Middle Aged
    Language Portuguese
    Publishing date 2001-12
    Publishing country Portugal
    Document type Journal Article
    ZDB-ID 632718-7
    ISSN 0870-2551 ; 0304-4750
    ISSN 0870-2551 ; 0304-4750
    Database MEDical Literature Analysis and Retrieval System OnLINE

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