Assessment of the Capability of PulmoVista 500 to Continuously Monitor Changes of Ventilation Over Time

Inclusion Criteria \- The population included in the clinical study will be selected from a pool of patients undergoing respiratory support who are scheduled to have their ventilation settings changed. As a subgroup, patients who are scheduled for surgeries that need one-lung-ventilation (OLV) will be enrolled to the study. * Male and female patients at the age of 18 years or older * On respiratory support in ICU care or scheduled for such ( e.g. postoperatively) or scheduled for surgery with OLV * Patients of which the monitoring of ventilation distribution may be of clinical interest * Patients being ventilated via an artificial airway with a mechanical ventilator that is compatible with PulmoVista 500 * Patients scheduled for changes in ventilation settings that may cause relevant changes in the ventilation * Chest circumference between 70 and 150 cm * Written informed consent to participate in the study provided by either the patient or the legal representative of the patient. Exclusion Criteria * Currently has a permanent or temporary pacemaker, implantable cardiac device (ICD) or other device emitting electrical energy * a BMI ≥ 50 * tidal volume (VT) ≤ 200 mL * Current uncontrolled body movements such as tics, tremors or seizures, * Current wound dressings or infections on the chest that might interfere with the PulmoVista 500 electrode belt placement * Women of child bearing potential whose pregnancy cannot be excluded based on a pregnancy test or other proven facts. * Allergic to materials used in the electrode belt * Participation of the patient in an interventional trial within the last four weeks before enrollment in this trial * Evidence suggesting that the patient or his legal representative is not likely to follow the trial protocol (e.g. lacking compliance) * Known infectious diseases that require isolation of patient (e.g. MRSA) * Concomitant use of an air anti-decubitus medical mattress with dynamic inflation that cannot be deactivated during EIT measurements