Acute gastrointestinal bleeding can produce hypovolemia, hypotension, and diminished
oxygen-carrying capacity, causing myocardial ischemia and necrosis. Activation of
the sympathetic nervous system can further increase myocardial oxygen demand and worsen
ischemia. These processes would be expected to be most important in patients with
obstructive coronary artery disease, a group that is also at risk for gastrointestinal
bleeding.
1
,
2
Studies examining the relationship between gastrointestinal bleeding and myocardial
ischemia suggest that the prevalence of acute myocardial infarction in patients with
gastrointestinal hemorrhage ranges from 1 to 14%.
1
,
2
,
3
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