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Clinical Usefulness and Efficacy of Intrathoracic Impedance Monitoring Using the OptiVol Patient Alert(TM)
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
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