Algorithm adaptation to an external impact on the data

A method, comprising:

• receiving a physiologic signal, sensed from a patient, for detecting a physiologic target event or condition of the patient;
• detecting a confounding event, different from the target event or condition, from at least one confounding event-bearing (CEB) signal;
• using the detected confounding event, segmenting the physiologic signal into at least first and second segments;
• adjusting at least one of the first or second segments, wherein adjusting at least one of the first or second segments is capable of being independent of adjusting the other of the first and second segments;
• and
• applying a target event or condition detection algorithm to the adjusted at least one of the first or second segments of the physiologic signal, to detect the target event or condition of the patient.

A method, comprising:

• receiving an impedance signal, sensed from a patient, for detecting a target event indicative of HF decompensation status of the patient;
• detecting a confounding event, different from the target event, from at least one confounding event-bearing (CEB) physiologic signal, wherein detecting the confounding event includes determining presence of the confounding event using whether a rate of change of the intensity of the CEB physiologic signal is within a specified range of physiologically relevant rate of change of the CEB physiologic signal;
• segmenting the impedance signal into at least first and second segments, the first segment taken before the start time of the detected confounding event, and the second segment taken after the stop time of the detected confounding event;
• adjusting the impedance signal by subtracting from at least one of the first and second segments a difference between an average intensity of the first segment and an average intensity of the second segment;
• and
• applying a HF decompensation detection algorithm to the adjusted impedance signal to detect the target event indicative of HF decompensation status.