Bma Illustrated Medical Dictionary - British Medical Association (Dk Publishing;2002;9780751333831;Eng).pdf
(
27332 KB
)
Pobierz
The British
Medical Association
ILLUSTRATED
MEDICAL
DICTIONARY
coronary
Any structure that encircles like
a crown. The term usually refers to the
coronary arteries
encircling the heart. It is
also sometimes used as a nonmedical
term for a heart attack (see
myocardial
infarction
).
coronary artery
Either of the 2 main
arteries
that supply the tissues of the
heart with oxygen-rich blood. These
arteries, known as the left and right main
coronary arteries, arise directly from the
aorta
. The term coronary artery is also
applied to any of the arteries that branch
off from the main coronary arteries, such
as the left circumflex artery and the left
anterior descending artery. Blockage of a
coronary artery as a result of
athero-
sclerosis
can lead to
myocardial infarction
.
(See also
coronary artery disease
.)
CORONARY ARTERY
Superior
vena cava
Aorta
Left main
coronary
artery
Left
circumflex
artery
Pulmonary
veins
Left
anterior
descending
artery
Right
main
coronary
artery
Coronary
vein
Inferior
vena cava
Descending
aorta
Essential
A–Z quick reference
to over 5,500 medical terms
The British
Medical Association
ILLUSTRATED
MEDICAL
DICTIONARY
A Dorling Kindersley Book
A
A
ABDOMEN
ABDOMINAL SWELLING
intake, eating unwisely, or an attack of
diarrhoea
. Pain in the lower abdomen
is common during menstruation but is
occasionally due to a gynaecological
disorder such as
endometriosis
.
Cystitis
is a common cause of pain or discom-
fort in the abdomen. Bladder distension
as a result of urinary obstruction may
also cause abdominal pain.
Abdominal colic is pain that occurs
every few minutes as one of the internal
organs goes into muscular spasm in an
attempt to overcome an obstruction
such as a stone or an area of inflamma-
tion. The attacks of colic may become
more severe and may be associated
with vomiting (see
abdomen
,
acute
).
Peptic ulcer
often produces recurrent
gnawing pain. Other possible causes of
abdominal pain are infection, such as
pyelonephritis
,
and
ischaemia
(lack of
blood supply), as occurs when a
volvu-
lus
(twisting of the intestine) obstructs
blood vessels. Tumours affecting an
abdominal organ can cause pain. Abdo-
minal pain can also result from anxiety.
For mild pain, a wrapped hot-water
bottle is often effective. Pain due to
peptic ulcer can be temporarily relieved
by food or by taking
antacid drugs.
Abdominal pain that is not relieved by
vomiting, persists for more than 6 hours,
or is associated with sweating or faint-
ing requires urgent medical attention.
Urgent attention is also necessary if
pain is accompanied by persistent vom-
iting, vomiting of blood, or passing of
bloodstained or black faeces. Unex-
plained weight loss or changes in bowel
habits should always be investigated.
Investigation of abdominal pain may
include the use of imaging tests such as
ultrasound scanning
, and endoscopic
examination in the form of
gastroscopy
,
colonoscopy
, or
laparoscopy
.
abdominal swelling
Enlargement of
the abdomen. Abdominal swelling is a
natural result of
obesity
and growth of
the uterus during pregnancy. Wind in the
stomach or intestine may cause uncom-
fortable, bloating distension of the
abdomen. Some women experience ab-
dominal distension due to temporary
water retention just before menstrua-
tion. Other causes may be more serious.
abdomen
The region of the body be-
tween the chest and the pelvis. The
abdominal cavity is bounded by the ribs
and diaphragm above, and by the pelvis
below, with the spine and abdominal
muscles forming the back, side, and
front walls. It contains the liver, stom-
ach, intestines, spleen, pancreas, and
kidneys. In the lower abdomen, enclosed
by the pelvis, are the bladder, rectum,
and, in women, the uterus and ovaries.
ABDOMEN
Stomach
Liver
Large
intestine
Area of
abdomen
Small
intestine
Rectum
abdomen, acute
Persistent, severe ab-
dominal pain of sudden onset, usually
associated with spasm of the abdomi-
nal muscles, vomiting, and fever.
The most common cause of an acute
abdomen is
peritonitis
. Other causes
include
appendicitis
, abdominal injury,
perforation of an internal organ due to
disorders such as
peptic ulcer
or
diver-
ticular disease
. Acute abdominal pain
commonly begins as a vague pain in the
centre but then becomes localized.
An acute abdomen requires urgent
medical investigation that may involve
a
laparoscopy
or a
laparotomy
. Treat-
ment depends on the underlying cause.
abdominal pain
Discomfort in the ab-
domen. Mild abdominal pain is common
and is often due to excessive alcohol
4
A
ABDOMINAL THRUST
ABSCESS
For instance,
ascites
(accumulation of
fluid between organs) may be a symp-
tom of cancer or disease of the heart,
kidneys, or liver; swelling may also be
due to intestinal obstruction (see
intes-
tine
,
obstruction of
) or an
ovarian cyst
.
Diagnosis of the underlying cause may
involve
abdominal X-rays
,
ultrasound
scanning
,
laparotomy
,
or
laparoscopy
. In
ascites, some fluid between organs may
be drained for examination.
abdominal thrust
A
first-aid
treatment
for choking, in which sharp upward pres-
sure is applied to the upper abdomen
to dislodge a foreign body obstructing
the airway. The technique is also known
as the Heimlich manoeuvre.
abdominal X-ray
An X-ray examina-
tion of the abdominal contents. X-rays
can show whether any organ is enlarged
and can detect swallowed foreign bod-
ies in the digestive tract. They also show
patterns of fluid and gas: distended
loops of bowel containing fluid often
indicate an obstruction (see
intestine
,
obstruction of
); gas outside the intestine
indicates intestinal
perforation
.
Calcium, which is opaque to X-rays, is
present in most kidney stones (see
calculus
,
urinary tract
) and in some
gallstones
and aortic
aneurysms
; these
can sometimes be detected on an
abdominal X-ray.
abducent nerve
The 6th
cranial nerve
.
It supplies the lateral rectus muscle of
each eye, which is responsible for mov-
ing the eyeball outwards. The nerve
originates in the pons (part of the
brain-
stem
) and passes along the base of the
brain, entering the back of the eye socket
through a gap between the skull bones.
abduction
Movement of a limb away
from the central line of the body, or of a
digit away from the axis of a limb. Mus-
cles that carry out this movement are
called abductors. (See also
adduction
.)
ablation
Removal or destruction of dis-
eased tissue by excision (cutting away),
cryosurgery
(freezing),
radiotherapy
,
dia-
thermy
(burning), or
laser treatment
.
abnormality
A physical deformity or
malformation, a behavioural or mental
problem, or a variation from normal in
the structure or function of a cell, tis-
sue, or organ in the body.
ABO blood groups
See
blood groups
.
abortifacient
An agent that causes
abor-
tion
. In medical practice, abortion is
induced using
prostaglandin drugs
,
often given as vaginal pessaries.
abortion
In medical terminology, either
spontaneous abortion (see
miscarriage
)
or medically induced termination of
pregnancy (see
abortion
,
induced
).
abortion, induced
Medically induced
termination of pregnancy. Abortion may
be performed if continuation of the
pregnancy would risk the woman’s life,
if the mental or physical health of the
woman or her existing children is at
risk, or if there is a substantial risk of
handicap to the baby.
Depending on the stage of pregnancy,
termination may be induced by using
drugs or by the surgical technique of
vacuum suction curettage, under either
a general or local anaesthetic, during
which the fetal and placental tissues are
removed. Complications are rare.
abrasion
Also called a graze, a
wound
on the skin surface that is caused by
scraping or rubbing.
abrasion, dental
The wearing away of
tooth enamel, often accompanied by the
erosion of dentine (the layer beneath
the enamel) and cementum (the bone-
like tissue that covers the tooth root),
usually through too-vigorous brushing.
Abraded areas are often sensitive to
cold or hot food or drink, and a desensi-
tizing toothpaste and/or protection with
a bonding (see
bonding
,
dental
) agent or
filling
may be needed.
abreaction
In
psychoanalysis
, the pro-
cess of becoming consciously aware of
repressed (buried) thoughts and feelings.
In Freudian theory, abreaction ideally
occurs by way of
catharsis
.
abscess
A collection of
pus
formed as a
result of infection by microorganisms,
usually bacteria. Abscesses may develop
in any organ and in the soft tissues
beneath the skin in any area. Common
sites include the armpit, breast (see
breast abscess
), groin, and gums (see
abscess
,
dental
). Rarer sites include the
liver (see
liver abscess
) and the brain
(see
brain abscess
).
Common bacteria, such as staphylo-
cocci, are the usual cause of abscesses,
5
A
ABSCESS, DENTAL
ACANTHOSIS NIGRICANS
although fungal infections can cause
them, and
amoebae
are an important
cause of liver abscesses (see
amoebia-
sis
). Infectious organisms usually reach
internal organs via the bloodstream, or
they penetrate tissues under the skin
through a wound.
An abscess may cause pain, depending
on where it occurs. Most larger absces-
ses cause fever, sweating, and malaise.
Those that are close to the skin often
cause obvious redness and swelling.
Antibiotics
,
antifungal drugs
, or
amoe-
bicides
are usually prescribed as
appropriate. Most abscesses also need
to be drained (see
drain
,
surgical
), and
in some cases a tube may be left in
place to allow continuous drainage.
Some abscesses burst and drain spon-
taneously. Occasionally, an abscess
within a vital organ damages enough
surrounding tissue to cause permanent
loss of normal function, or even death.
abscess, dental
A pus-filled sac in the
tissue around the root of a tooth. An
abscess may occur when bacteria
invade the pulp (the tissues in the cen-
tral cavity of a tooth) as a result of
dental
caries
, which destroys the tooth’s
enamel and dentine, allowing bacteria
to reach the pulp. Bacteria can also gain
access to the pulp when a tooth is
injured. The infection in the pulp then
spreads into the surrounding tissue to
form an abscess. Abscesses can also
result from
periodontal disease
, in which
bacteria accumulate in pockets that
form between the teeth and gums.
The affected tooth aches or throbs,
and biting or chewing is usually
extremely painful. The gum around the
tooth is tender and may be red and
swollen. An untreated abscess eventu-
ally erodes a sinus (channel) through
the jawbone to the gum surface, where
it forms a swelling known as a gumboil.
As the abscess spreads, the glands in
the neck and the side of the face may
become swollen, and fever may develop.
Treatment may consist of draining the
abscess, followed by
root-canal treat-
ment
of the affected tooth, but in some
cases
extraction
of the tooth is neces-
sary.
Antibiotics
are prescribed if the
infection has spread beyond the tooth.
ABSCESS, DENTAL
Enamel
Decay
Dentine
Gum
Pulp
Blood
vessel
Nerve
Jawbone
Abscess
An abscess in a periodontal pocket can
usually be treated by the dentist scrap-
ing away infected material.
absence
In medical terms, a temporary
loss or impairment of consciousness
that occurs in some forms of
epilepsy
,
typically generalized absence (petit
mal) seizures in childhood.
absorption
The process by which flu-
ids or other substances are taken up by
body tissues. The term is commonly
applied to the uptake of the nutrients
from food into blood and lymph from
the digestive tract. The major site of
absorption is the small intestine, which
is lined with microscopic finger-like
projections called villi (see
villus
). The
villi greatly increase the surface area of
the intestine, thereby increasing the
rate of absorption.
acanthosis nigricans
A rare condition
in which thickened dark patches of skin
appear in the groin, armpits, neck, and
other skin folds. The condition may
occur in young people as a genetic dis-
order or as the result of an endocrine
disorder such as
Cushing’s syndrome
. It
also occurs in people with carcinomas
of the lung and other organs.
Pseudoacanthosis nigricans is a much
more common condition, usually seen
in dark-complexioned people who are
overweight. In this form, the skin in fold
areas is both thicker and darker than the
surrounding skin, and there is usually
excessive sweating in affected areas. The
condition may improve with weight loss.
6
Plik z chomika:
palmoff
Inne pliki z tego folderu:
Medical Virology 4th ed - D. White, F. Fenner (AP, 1970) WW.pdf
(41503 KB)
(Biomedical Engineering) Introduction To Medical Electronics Applications (234S).pdf
(11306 KB)
Pathfinder RPG OGL - Insults & Injuries - A Pathfinder Sourcebook for Medical Maladies.pdf
(24581 KB)
Medical Img Computing, Computer-Assisted Intervention [Pt. 3] - G. Fichtinger, et al., (Springer, 2011) WW.pdf
(23064 KB)
Science, Medical - Human Anatomy Textbook.pdf
(36881 KB)
Inne foldery tego chomika:
army
buschcraft 2
bushcraft
bushcraft 1
data
Zgłoś jeśli
naruszono regulamin