An overly mature baby that has not been born until well after the usual term pregnancy.
A post-term baby is one born 2 weeks (14 days) or more after the usual 9 months (280 days) of gestation. The gestation (length of the pregnancy) is calculated from the date of the last menstrual period (LMP). This is a very important calculation since, if delivery is delayed 3 weeks beyond term, the infant mortality rate skyrockets to 3 times normal.
The definition of a post-term infant has evolved. A few sources still consider a baby post-term if it is born a week after the usual 9 months’ gestation but the current trend is to consider a baby post-term only if it is born 2 weeks (14 days) or more after the usual full-term 9 months of gestation.
The terms “post-term infant” and “postmature infant” are interchangeable.
- Post-thrombotic syndrome
The complications that may follow deep vein thrombosis (DVT). The complications after DVT may include persistent edema (swelling), pain, purpura (bleeding into the skin), increased skin pigmentation, eczematoid (eczema-like) dermatitis, pruritus (itchiness), ulceration, and cellulitis (bacterial infection just below the skin). All of these complications result from the impaired return of blood through the veins […]
- Post-traumatic stress
An anxiety disorder that develops in some individuals who have had major traumatic experiences. The person is typically numb at first but later has symptoms including depression, excessive irritability, guilt (for having survived while others died), recurrent nightmares, flashbacks to the traumatic scene, and overreactions to sudden noises. Post-traumatic stress became known in the 70s […]
- Post-traumatic stress disorder
Reliving the event through upsetting thoughts, nightmares or flashbacks, or having very strong mental and physical reactions if something reminds the person of the event. Avoiding activities, thoughts, feelings or conversations that remind the person of the event; feeling numb to one’s surroundings; or being unable to remember details of the event. Having a loss […]
The back or behind, as opposed to the anterior. For a more complete listing of terms used in medicine for spatial orientation, please see the entry to “Anatomic Orientation Terms”.
- Posterior chamber
The space in the eye behind the iris and in front of the lens. (The iris is the colored ring of tissue that regulates the amount of light entering the eye by adjusting the size of the pupil. The lens is the transparent biconvex body in the eye that refracts light. By “biconvex” is meant […]