An episiotomy is a surgical incision used to enlarge the vaginal opening to help deliver a baby. An episiotomy may be needed for any of the following reasons: 1  Birth is imminent and the perineum hasnât had time to stretch slowly. 2  The babyâs head is too large for the vaginal opening. 3  The baby is in distress. 4  The mother needs a forcep or vacuum assisted delivery.
A hypersensitive immune system is one which overreacts to a stimulus. A normal immune system reacts when the body identifies a foreign protein such as proteins on the outside of bacteria.This foreign material which invokes the immune response is called an antigen.mail Article. A hypersensitive immune system is one which overreacts to a stimulus. A normal immune system reacts when the body identifies a foreign protein such as proteins on the outside of bacteria. This foreign material which invokes the immune response is called an antigen.
Drug hypersensitivity results from interactions between a pharmacologic agent and the human immune system. These types of reactions constitute only a small subset of all adverse drug reactions. Allergic reactions to medications represent a specific class of drug hypersensitivity reactions mediated by IgE.rug reactions encompass all adverse events related to drug administration, regardless of etiology. Drug hypersensitivity is defined as an immune-mediated response to a drug agent in a sensitized patient.