Clinical Usefulness and Efficacy of Intrathoracic Impedance Monitoring Using the OptiVol Patient Alert(TM)
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In this study we investigate the clinical value and efficacy of OptiVol (TM) impedance measurements by Medtronic (R) ICD's. We aim to determine sensitivity and positive predictive value for detecting heart failure. We also investigate if left ventricular filling pattern measured by echocardiography and/or brain natriuretic peptide (BNP) level can be used to improve the positive predictive value of the Optivol alert
Condition or disease
Patients who have a Medtronic (R) ICD equipped with the Optivol (TM) impedance monitoring will be included in your study after informed consent. The OptiVol (TM) feature will be activated and at baseline data is collected (blood sample including BNP, electrocardiography, echocardiography, chest X-ray and ICD check-up). During follow-up patients will be re-assessed in case of an OptiVol alert or in case of heart failure.
clinical efficacy and value of ambulatory intrathoracic impedance measurement of the Optivol alert as an indicator of decompensated heart failure reflected by sensitivity and positive predictive value [ Time Frame: end of follow-up ]
Secondary Outcome Measures :
influence of left ventricular filling pattern and brain natriuretic level on the positive predictive value of the Optivol alert [ Time Frame: end of follow-up ]
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Ages Eligible for Study:
18 Years and older (Adult, Senior)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
patients who have been implanted a biventricular pacemaker ICD equipped with impedance monitoring and who are known with chronic heart failure of any cause
chronic heart failure of any cause
implanted Medtronic ICD with OptiVol impedance monitoring