> as you inhale, the mediastinal intrapleural pressure becomes more negative, leading to expansion of the lungs, and pressure drops in the RA, RV, SVC, and IVC.

> as you inhale, the mediastinal intrapleural pressure becomes more negative, leading to expansion of the lungs, and pressure drops in the RA, RV, SVC, and IVC. Right Atrial expansion increases the pressure gradient for venous return So you're saying my lung volume has implications for the chance of deep vein thrombosis or possibly even for varicose veins? Great engineering right there.