Final answer:
The patient is said to be in the Trendelenberg position when recumbent and head is positioned lower than the feet, differentiating from Fowler, Decubitus, and Sims positions.
Step-by-step explanation:
When a patient is recumbent with their head positioned at a lower level than their feet, they are said to be in the Trendelenberg position. This position involves lying on the back (supine) with the body tilted so that the feet are higher than the head. This is different from the Fowler position, where the patient is seated with the upper body raised at various angles; the Decubitus position, which refers to the patient lying on their side; and the Sims position, which is a variation of the left lateral decubitus position with the right hip and knee bent.