What Causes Intrathoracic Pressure

The changes in intrathoracic pressure during the respiratory cycle are mainly caused by the changes in the intrapleural pressure that is transmitted to all intrathoracic pressure values (Boerrigter et al., 2014).

What increases intrathoracic pressure?

Third, positive-pressure ventilation increases intrathoracic pressure. Since diaphragmatic descent increases intra-abdominal pressure, the decrease in the pressure gradient for venous return is less than would otherwise occur if the only change were an increase in right atrial pressure.

Does exercise increase intrathoracic pressure?

Exercise influences these cardiopulmonary interactions by augmenting the fluctuations in intrathoracic pressure (ITP) and altering the depth and frequency of breathing while at the same time increasing the demand for cardiac output (Olafsson et al.