Glossary

 

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E

echocardiogram

record produced by echocardiography

echocardiography

noninvasive cardiac imaging procedure used to diagnose heart disease, valve disorders (valvular heart disease), weakened heart muscle, fluid around the heart (pericarditis), and other abnormalities or defects by reflecting sound waves off the heart

eczema

disorder of the skin characterized by inflammation, itching, blisters, and scales

edema

swelling as a result of fluid retention

EEG
(electroencephalogram)

test used to study brain wave activity, often used to evaluate seizure disorders

ejaculation

ejection of semen during male orgasm

ejection fraction

percentage of blood that is ejected out of the left ventricle into the aorta with each heart beat

electrocardiography/
electrocardiogram
(ECG, EKG)

graphical recording of the electrical currents that pass through the heart muscle during each heartbeat; commonly called an EKG because the procedure was developed in the Netherlands, where it was spelled "electrokardiogram"

electrohydraulic
lithotripsy (EHL)

technique that uses small shock waves to break up small kidney stones

electron-beam radiation

radiation therapy in which the beams penetrate the skin only, thus limiting internal side effects

EMG/NCV
(electromyography/
nerve conduction study)

test to study the nerves and muscles for diagnosis of disorder, with electrical conduction studied in the NCV

encephalitis

inflammation or infection of the brain

 

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endocarditis

inflammation and infection of a heart valve or the lining of the heart's chambers

endothelium

layer of epithelial cells that lines the cavities of the heart, blood vessels, and the serous cavities of the body

enterocele

herniation of the small bowel into the vagina

epidermis

top layer of skin, composed mainly of squamous cells, as well as basal cells, melanocytes, and other types of cells

epididymis
(pl., epididymes)

coiled tube that extends the length of each testis and connects with the vas deferens

epilepsy

episodic disorder resulting from temporary brain dysfunction which produces convulsive or nonconvulsive seizures

erosion

moist, slightly depressed area of skin where the top layer (epidermis) has been removed

erythema

redness and warming of the skin, typically due to inflammation caused by trauma or infection

 

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erythroderma

diffuse reddening of the skin, caused by one of many disorders including psoriasis, eczema, drug sensitivities, and lymphoma

esophagus

muscular tube that begins at the back of the throat, passes through the neck and chest, and enters the stomach at the gastroesophageal junction just below the diaphragm

esphagogastric-
duodenoscopy (EGD)

test to observe the esophagus, stomach, and portion of the small intestine

estrogen

hormone produced by the ovaries that is responsible for the development of female sex characteristics

eversion

motion of a body part as it tilts away from the midline

evoked potentials

series of electrophysiological tests to evaluate the function of specific nervous system elements associated with multiple sclerosis

exacerbation

worsening of symptoms

excise

to cut out

excisional biopsy

surgical removal of tissue for pathological analysis

exfoliation

shedding of the top layers of the epidermis

external-beam
radiation therapy

treatment that utilizes external-beam radiation

extraocular muscles

six muscles that attach to each eyeball and perform eye movements and rotation

extracorporeal shock wave lithotripsy(ESWL)

highly focused electrical impulses that are projected from outside the body to pulverize kidney stones

extrinsic asthma

asthma triggered by an allergic reaction, usually something that is inhaled

eyelashes

small hairs that grow at the edge of each eyelid

eyelids

moveable folds of skin that protect the surface of the eyeballs

 

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