None. Plethysmography is a noninvasive diagnostic manometric study used to measure changes in the size of blood vessels by determining volume changes in the blood vessels of the eye, extremities, and neck or to measure gas volume changes in the lungs.
1. countable noun [usually with poss] A guardian is someone who has been legally appointed to look after the affairs of another person, for example a child or someone who is mentally ill. 2. countable noun. The guardian of something is someone who defends and protects it.
Guardianship of the person In a guardianship of the person, the guardian has the same responsibilities to care for the child as a parent would. That means the guardian has full legal and physical custody of the child and can make all the decisions about the physical care of the child that a parent would make.