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  • Coronary Heart Disease  (1)
  • Effective refractory period  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 62 (1984), S. 773-776 
    ISSN: 1432-1440
    Schlagwort(e): Effective refractory period ; Right ventricle ; Dependence on stimulation duration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary This study was performed to assess the dependence of the effect of the duration of stimulation on the effective refractory period (ERP). ERP was determined in 12 patients after four consecutive stimuli as well as after continuous stimulation for 1 min applying a constant stimuli interval of 600 msec. After 1 min stimulation all patients showed a significant (P〈0.01) decrease of the ERP with 236±23 SD msec in comparison to the ERP of 271±26 SD msec after four consecutive stimuli. Although it is well established that ERP depends on the previous cycle length, it is additionally influenced by the stimulation duration, as shown in this study. This must be considered when ERP or other electrophysiological parameters of the right ventricle are investigated.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1432-1440
    Schlagwort(e): Aspirin® ; Coronary Bypass ; Coronary Heart Disease ; Platlets ; Platlet Inhibition
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A prospective, randomized, doubleblind, placebo-controlled trial was conducted to evaluate the efficacy of Acetylsalicylic Acid (ASS) (100 mg/d, starting 24 h after operation) on vein graft patency. Sixty of 88 patients having undergone surgery entered the study; in 24 of 31 patients in the placebo group and 22 of 29 patients in the ASS-group angiography was performed 4 months postoperatively. There were no significant differences between the groups with respect to age, number of diseased vessels or previous myocardial infarctions. Mean number of grafts per patient was 2,2 (placebo) and 1,8 (ASS) for proximal anastomoses (p〈0.10) and 3.4 (placebo) and 2.6 (ASS) for distal anastomoses (p〈0.05). Graft occlusion rate for proximal anastomoses was less in the ASS-group, 10% (4/40), as compared with placebo 32% (17/53) (p〈0.05). Graft occlusion rate for distal anastomoses was also less in the ASS group, 19% (11/57) as compared to 35% (28/81) in the placebo group (p〈0.10). All grafts were patent in 16/22 patients in the ASS group but only in 9/24 in the placebo group (p〈0.05). On designation of patients without postoperative angiograms but cardiovascular events as well as those with at least one graft occluded as “failures”, the incidence of the latter was 9/29 in the ASS group and 20/31 in the placebo group (p〈0.05). Early postoperative bleeding was similar in both groups, no side effects of ASS were observed. In this trial with initiation of low — dose ASS therapy 24 h after operation, antiplatlet therapy reduced the graft occlusion rate significantly.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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