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15 Cards in this Set
- Front
- Back
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the apical beat is also referred to as what
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the point of maximal impact (PMI)
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Where can the PMI be felt and sometimes seen
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the 5th intercity space and the midclavicular line
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what would cause a shift in the PMI
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a change in anatomical position of the heart, such as a pnemothorax
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what can lead to a Myocardial infarction
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when an occluded artery becomes hypoxic (ischemic)
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angina pectoris
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when ischemia produced by a coronary artery occlusion stimulates pain - eliciting fibers to produce pain felt beneath sternum, left arm, and neck
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how many deaths in the US are caused by coronary art er you disease
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35%
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what is the dominant supplier of blood to the heart
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right coronary artery, 50%
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how much oxygen does the heart extract from arterial blood flow
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70%
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what is the major factor governing coronary blood flow
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Myocardial oxygen need
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when does most of the coronary perfusion occur
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during ventricular relaxation (diastole)
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the SA node is responsible for what
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electrical impulses that produce sequential atrial and ventricular contraction
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where do the impulses of the SA node travel over
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the atrioventricular node (AV)
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what do the AV node and bundle of His do to the impulses
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slow down the velocity before transmitting ot to the ventricles
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what type of fibers are Cardiac sympathetic receptors
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beta 1
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describe the Frank - Starling mechanism
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the inherit ability of the heart to increase its force of contraction as increasing amounts of blood flow into it
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