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13 Cards in this Set

  • Front
  • Back
Underlying cause of CAD
Myocardial ischemia
Acute coronary syndromes often result from
acute changes in chronic atherosclerotic lesions.
Results from an imbalance of myocardial oxygen demand and myocardial blood supply
Ischemic Heart Disease
IHD as a result of coronary occlusion causes myocardial cells to
-become hypoxic
-lose ability to contact after several minutes
-die after 20 minutes
Chest pain caused by buildup of lactic acid or abnormal stretching of the ischemic muscle.
Temporary is reversible.
Pallor, sweating, and dyspnea may be associated.
Angina pectoris
Generally predictable angina caused by luminal narrowing and hardening of the arterial walls.
Stable angina
Unpredictable angina that is caused by a combo of vasospasm and atherosclerotic lesions. Often occurs at rest.
Unstable angina
Prolonged ischemia which leads to irreversible hypoxic injury, cell death, and tissue necrosis.
Myocardial infarction
Begins in the subendocardial region and extends externally over a period of 3 to 6 hours.
Necrosis
Anaerobic metabolism kicks in to supply 65-70% of the myocardial energy requirement.
Glycolysis
Cardiac cells are very sensitive to low pH because acidosis may suppress impulse conduction and contractile function.
H+ ions and lactic acid accumulation.
Electrolyte disturbances lead to myocardial irritability.
Loss of K+ and Ca++
75% of MI's have this complication
Cardiac arrhythmias