Impact of Chest Wall Mechanics on Lung and Cardiovascular Function During Delayed Sternal Closure

Participants will undergo placement of an esophageal manometry catheter before planned sternal closure. This catheter will be used to measure esophageal pressure which is a surrogate for pleural (intrathoracic) pressure. Esophageal pressure will then be used to estimate changes in respiratory system mechanics and hemodynamics following sternal closure and across different levels of positive end-expiratory pressure (PEEP) and tidal volumes.