Systems and methods to determine patient's responsiveness to alveolar recruitment maneuver

[0129] Embodiment 1. A method for determining a potential lung recruitment value in a patient, the method comprising: measuring a first end-expiratory lung pressure in at least one region of the lung during an applied first positive end-expiratory pressure Impedance; during the applied second positive end-expiratory pressure, measuring a second end-expiratory lung impedance in the at least one region of the lung; a change in end-expiratory lung impedance between said impedance measurements obtained at a positive end-expiratory pressure and said second positive end-expiratory pressure; according to Obtaining impedance measurements to determine a first chordal compliance of said at least one region of said lung; determined from pixels of a second electrical impedance tomography image of said patient at said second positive end-expiratory pressure a second chord compliance of the at least one lung of the patient; and determining the at least one region of the lung from impedance ...

[0130] Embodiment 2. The method of embodiment 1, further comprising: determining said at least one chord representative of said lung based on said first chord compliance observed during said first positive end-expiratory pressure. A first index of the end-tidal lung impedance change in the region.

[0131] Embodiment 3. The method of embodiments 1 and 2, further comprising: based on the pressure difference between the first positive end-expiratory pressure and the second positive end-expiratory pressure and based on describing elastic lung behavior The above-predicted or below-predicted second index representing a change in lung compliance in the at least one region of the lung is determined using the equation of the lung.