Three Types of ST Depression
ST Depression is often a sign of myocardial ischemia, of which coronary insufficiency is a major cause. Other ischemic heart diseases causing ST depression include:
•Subendocardial ischemia or even infarction
•Non Q-wave myocardial infarction
ST Depression is often a sign of myocardial ischemia, of which coronary insufficiency is a major cause. Other ischemic heart diseases causing ST depression include:
•Subendocardial ischemia or even infarction
•Non Q-wave myocardial infarction
•Reciprocal changes in acute Q-wave myocardial infarction (e.g., ST depression in leads I & aVL with acute inferior myocardial infarction)
•Depressed but upsloping ST segment generally rules out ischemia as a cause.
Also, it can be a normal variant or artifacts, such as:
•Pseudo-ST-depression, which is a wandering baseline due to poor skin contact of the electrode
•Physiologic J-junctional depression with sinus tachycardia
•Hyperventilation
Other, non-ischemic, causes include:
•Side effect of digoxin
•Hypokalemia
•Right or left ventricular hypertrophy
•Intraventricular conduction abnormalities (e.g., right or left bundle branch block, WPW, etc.)
•Hypothermia
•Tachycardia
•Reciprocal ST elevation
•Mitral valve prolapse
•Depressed but upsloping ST segment generally rules out ischemia as a cause.
Also, it can be a normal variant or artifacts, such as:
•Pseudo-ST-depression, which is a wandering baseline due to poor skin contact of the electrode
•Physiologic J-junctional depression with sinus tachycardia
•Hyperventilation
Other, non-ischemic, causes include:
•Side effect of digoxin
•Hypokalemia
•Right or left ventricular hypertrophy
•Intraventricular conduction abnormalities (e.g., right or left bundle branch block, WPW, etc.)
•Hypothermia
•Tachycardia
•Reciprocal ST elevation
•Mitral valve prolapse
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