Non-Invasive Measurements of Changes in Pulmonary Artery Pressure in Intensive Care Unit Patients Using Electrical Impedance Tomography - A Feasibility Study

This is a feasibility study testing whether a non-invasive technology called Electrical Impedance Tomography (EIT) — which uses mild electrical signals to create images of the lungs — can measure changes in lung artery pressure in ICU patients, potentially reducing the need for an invasive heart catheter. **You may be eligible if...** - You are 18 or older and are a patient in the ICU on a breathing machine - Your doctors have decided you need invasive monitoring of your heart and lung pressures using a pulmonary artery catheter **You may NOT be eligible if...** - You have an implanted pacemaker or other electronic chest device, or metal implants in the chest - You are pregnant or breastfeeding - You have open lung injuries, pneumothorax (collapsed lung), or open chest wounds - You have burns, rashes, or drainages on your upper chest - Your chest circumference is very small (under 66 cm) or very large (over 134 cm) - You are allergic to adhesive gel electrodes Talk to your doctor to see if this trial is right for you.