The word “decubitus” means lying down. Ventral decubitus/prone means lying on one’s stomach. This technique is particularly useful in cases of severe respiratory failure, as it improves gas exchange (breathing efficiency). Lateral decubitus/prone can also be used to position patients on their sides, again generally to promote breathing. Lateral decubitus/prone can also be used in intensive care to relieve pressure points and prevent or treat pressure sores.