Proper care and protection
of the feet are extremely important for people with diabetes. This is due to the fact that
the feet are
frequently affected by diabetic
nerve damage with a resultant loss of protective sensation.
Protective sensation
is the perception of poten- tial injury, such as
awareness of
sharp, rough,
or excessively hot or cold objects or friction, such as rub- bing
against the
inside
of
shoes. When this is impaired, it is possible for the person with diabetes to sustain wounds, abrasions, burns, or freezing of which he or she may be unaware. Other
types of injuries such as bites and blisters can similarly occur unno- ticed. Even fractures to the
bones
of the foot can
occur painlessly when more severe forms of diabetic
nerve damage are present. The most serious conse-
quence of unperceived injury is infection. Because the
blood supply to the feet may also be
impaired, the healing
and immune response to both the injury and
the
infection can be compromised, so that a chroni-
cally infected
wound results. The most
dangerous consequences of chronically
infected wounds
are
spread of infection to the deeper tissues,
including the bones,
and entry of
infectious organisms into
the bloodstream,
which
can
lead to
blood
poisoning
(septicemia) or spread by the bloodstream of infec- tion to other body tissues. Both of these consequences can cause severe illness or even death. Local infection of the bones of the feet can require amputation, since
infection in the bone (called “osteomyelitis”) is very difficult to treat. Even powerful
modern antibiotics
given intravenously over several weeks may fail to completely eradicate infection in bone when its blood supply is poor.
Diabetic nerve damage in the feet may lead to distur- bance of the mechanics of the foot, such that pressure may occur on bony areas not designed to bear this. This can cause unusual prominences of the bones of the feet on all of their surfaces, which are more prone to injury than usual. Corns, calluses,
cracks, fissures, and ulcers of the feet can all occur in people with dia-
betes in the absence of specific
injury, but as a result of
abnormal pressure distribution
caused
by nerve damage.
For
all of these reasons, it is very important to protect the feet by wearing suitable footwear, not going bare- foot, paying
attention to the environment (i.e., removal or covering of protruding furniture legs etc.
and hard, abrasive floor surfaces), performing daily inspection of the feet, foot hygiene, nail care, and prompt cleaning
and dressing of minor injuries.
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