Category: E

In electrocardiography, the interval during which a second action potential cannot occur in an excitable fiber unless the stimulus is much stronger than usual; the membrane is still in the repolarization phase of the previous action potential.  

Inflammation of the exterior surface of the pericardium.  

Scaling, erythematous macules and blebs of the scalp, face, and trunk. The lesions have a “butterfly” distribution over the face. The disease resembles pemphigus foliaceus.  

A renal pelvis located outside the kidney.  

A pathway from the central nervous system to an effector.  

The study of diseases induced artificially and intentionally, especially in animals.  

A parasite that lives on the outer surface of its host, such as a flea, louse, mite, or tick.  

Discomfort during the second stage of labor, associated with bearing-down efforts to expel the fetus. Women may experience a similar pain during delivery of the placenta.  

Pain located between the xiphoid process and the umbilicus. It may suggest a problem in one of many different organs, including the stomach, pancreas, gallbladder, small or large bowel, pleura, or heart.  

Pain occurring in peripheral structures owing to a lesion involving the posterior roots of the spinal nerves.