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Intrathoracic Impedance and Ultrasound Lung Comets in Heart Failure Deterioration Monitoring

Purpose: Echographic examination of the lung surface may reveal multiple ultrasound lung comets (ULCs) originating from water‐thickened interlobular septa. These images were demonstrated to be useful for noninvasive assessment of interstitial pulmonary edema. Similarly, the correlation between implantable defibrillator‐measured intrathoracic impedance and pulmonary capillary wedge pressure (PCWP) was demonstrated in heart failure (HF) patients. The aims of this analysis were to assess the agreement between defibrillator‐detected impedance decrease and the presence of ULCs, as well as to compare the performance of the impedance‐detection algorithm and the ULCs assessment in predicting HF worsening.