wk4patho - Running head WK4PATHO 1 wk4patho April Matthews Walden University WK4PATHO 2 wk4patho Then explain how hypertension or dyslipidemia can lead

wk4patho - Running head WK4PATHO 1 wk4patho April Matthews...

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Running head: WK4PATHO 1 wk4patho April Matthews Walden University
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WK4PATHO 2 wk4patho Then, explain how hypertension or dyslipidemia can lead to the alteration you selected for patients with the factor you identified. Main Post Myocardial Infarction Myocardial infarction is when there is death of the myocardial tissue, often referred to as a “heart attack”. This occurs when perfusion to the heart is occluded for greater than 20 minutes. When the demands on the heart increase there is a need for increased oxygenation. When increased, oxygen is needed healthy vessels will dilate to increase blood flow to the myocardium. If there is “a narrowing of a major coronary artery by more than 50%, it decreases blood flow enough to hamper cellular metabolism” (Huether & McCance, 2017, p. 613). Ischemia occurs if the oxygen is not enough to meet the demands. The most common cause of ischemia is a blockage caused by atherosclerotic plaques. They plaques can be stable or unstable. The unstable clots are prone to rupture, resulting in platelet adhesion and thrombus. A few other causes of ischemia are; coronary spasm, hypotension, dysrhythmia. “Some common causes for increased myocardial demand are: tachycardia, exercise, hypertension, and valvular disease” (Huether & McCance, 2017, p. 613). Ischemia takes place when the myocardial cells have been occluded for 10 seconds, initiating an anaerobic process to start and lactic acid to accumulate. The heart can
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  • Spring '15
  • Atherosclerosis, infarction

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