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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of Atrial Refractoriness and Atrial Fibrillation Inducibility Immediately after Internal Cardioversion in Patients with Chronic Persistent Atrial Fibrillation (1999)
    Springer
    Cardiovascular drugs and therapy 13 (1999), S. 507-511 
    Details
    ISSN: 1573-7241
    Keywords: antiarrhythmic agents ; atrial fibrillation ; cardioversion ; electrophysiology ; refractoriness ; AF = atrial fibrillation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Summary. Objective: To prospectively evaluate right atrial refractoriness and sustained atrial fibrillation (AF) inducibility at programmed electrical stimulation in two groups of patient: a series of patients with chronic persistent AF, studied immediately after successful low energy internal atrial cardioversion, and a group of control patients without history of supraventricular arrhythmias. Patients: Nineteen patients with chronic persistent AF (mean AF duration 11 ± 10 months, range 2–61 months) submitted to successful internal low energy atrial cardioversion in fully conscious state and 11 control patients without history of supraventricular arrhythmias. Methods: An electrophysiological evaluation was performed to measure atrial refractoriness and AF inducibility, by delivering single atrial extrastimuli in high right atrium, at decremental coupling, during spontaneous sinus rhythm and after 8 beats at 600, 500, 400 and 330 ms cycle length. If sustained AF was induced the protocol was terminated. Results: During programmed atrial stimulation sustained AF was induced in 8 out 19 (42%) of the AF patients but in none of the control group. Atrial effective refractory period was significantly shorter in AF patients compared to controls both at basic cycle length, at 600 ms, 500 ms and 400 ms cycle length, meanwhile no statistically significant differences were found at 330 ms cycle length. An altered relationship between atrial effective refractory period and cycle length was found in AF patients compared to controls: the slope of linear correlation slope was significantly lower in AF group than in controls (0.04 ± 0.07 vs 0.17 ± 0.10, p 〈 0.002). Conclusions: Marked abnormalities of atrial refractoriness and of its heart rate relationship are observed after internal cardioversion of chronic persistent AF in humans and these abnormalities are associated with an high vulnerability to AF. These observations may explain the high risk of AF recurrences in the early phases following successful cardioversion. In this scenario antiarrhythmic drug therapy seems to be mandatory for reducing arrhythmia relapses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007823619899
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hemodynamic effects of felodipine in congestive heart failure (1987)
    Springer
    Cardiovascular drugs and therapy 1 (1987), S. 161-167 
    Details
    ISSN: 1573-7241
    Keywords: felodipine ; congestive heart failure ; vasodilators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The hemodynamic effects of increasing dosages of felodipine, a new calcium antagonist with selective vasodilator properties, were studied in 13 patients with chronic cardiac failure. A Swan-Ganz thermodilution catheter was positioned in the pulmonary artery and hemodynamic parameters were monitored from 9 am to 6 pm for five days. On the first and the fifth day patients received placebo (P) and on the second, third, and fourth day patients received felodipine 5, 10, and 20 mg, respectively. Symptom-limited exercise tests with a bicycle ergometer were performed on both days of P and on the fourth day. A marked reduction of systemic vascular resistance (SVR) and a significant increase of cardiac index without increments of heart rate (HR) were observed after felodipine at rest. A dose response effect could be demonstrated. During exercise a significant increment of cardiac index and decrease of pulmonary wedge pressure was observed after felodipine. Felodipine showed a potent vasodilator action on systemic circulation with significant changes on both stroke volume and filling pressures at rest and during exercise without side effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02125469
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Felodipine in severe chronic congestive heart failure: Acute effects on central hemodynamics and regional blood flow distribution (1989)
    Springer
    Cardiovascular drugs and therapy 3 (1989), S. 903-911 
    Details
    ISSN: 1573-7241
    Keywords: felodipine ; congestive heart failure ; regional blood flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In order to assess the effect of felodipine, a new calcium antagonist with vascular selectivity, on regional blood flow distribution at rest in chronic congestive heart failure, ten patients were studied during an acute test. Right heart catheterization allowed the evaluation of hemodynamic parameters; renal blood flow was calculated using paraamino-hippuric acid clearance; hepatic blood flow measurement was based on indocyanine green clearance; and limb blood flow was assessed with venous occlusion plethysmography. Blood samples were collected for the analysis of plasma catecholamines, renin, and aldosterone. All parameters were recorded in duplicate under basal conditions and after felodipine infusion. The infusion of felodipine induced a significant increase in cardiac index, stroke work index, and limb blood flow. Systemic and pulmonary arterial blood pressure, pulmonary wedge pressure, and systemic resistance underwent a significant decrease. The heart rate, pulmonary resistance, renal blood flow, and hepatic blood flow were not changed. In conclusion, felodipine was of benefit in congestive heart failure at rest in an acute test, acting through a marked decrease in vascular resistance and a consequent improvement in cardiac output and limb blood flow. No changes in renal and hepatic blood flow were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01869580
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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