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myocardial
infarction
is
a
serious
complication
of
coron-
ary heart
disease. Researches
found that
the incidence
of
acute
myocardial infarction
has
certain time regularity.
Acute myocardial
infarction occur mostly
in
winter,
especially
after a
cold
current's
attack.
This
is
closely related
to
the raised
excitability
of
the sym-
pathetic nerve
and
the
release
of
catecholamine inside the
body
owing
to
sudden shivery.
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