Filtering patient signal also for ventilation artifacts

A system for treating a patient, comprising:

• a mechanical chest compression device configured to deliver chest compressions to the patient at a frequency Fc;
• a ventilator configured to deliver ventilations to the patient at a frequency Fv;
• and
• an external device having a housing and a processor within the housing, the processor configured to:
• receive a signal from the patient, and
• apply at least one filter mechanism to the patient signal to substantially remove from the patient signal artifacts at the frequency Fc and a higher harmonic of the frequency Fc.

A system for treating a patient, comprising:

• a mechanical chest compression device configured to deliver chest compressions to the patient at a frequency Fc;
• a ventilator configured to deliver ventilations to the patient at a frequency Fv;
• and
• an external device having a housing and a processor within the housing, the processor configured to:
• receive a signal from the patient, and
• apply at least one filter mechanism to the patient signal to substantially remove from the patient signal artifacts at the frequency Fc, a higher harmonic of the frequency Fc, and a third frequency substantially equaling the frequency Fc plus or minus the frequency Fv, while substantially passing other frequencies between the frequency Fc and the higher harmonic, and between the frequency Fc and the third frequency.