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14 Cards in this Set
- Front
- Back
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atrial fibrillation
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a common cardiac dysrhythmia with atrial contractions that are so rapid that they prevent full repolarization of myocardial fibers between heartbeats
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Automaticity
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a property of specialized excitable tissue in the heart that allows self-activation through the spontaneous development of an action potential, such as in the pace-maker cells of the heart
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Chronotropic drugs
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drugs that influence the rate of the heart
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dromotropic drugs
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drugs that influence the conduction of electrical impulses within tissues
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ejection fractions
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the proportion of blood that is ejected during each ventricular contraction compared with the total ventricular filling volume
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heart failure
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an abnormal condition in which the heart can not pump enough blood to keep up with the body's demand. Often a result of MI, ischemic heart disease, or cardiomyopathy
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inotropic drugs
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drugs that influence the force of muscular contractions, particularly contractions of the heart muscle
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left ventricular end-diastolic volume
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the total amount of blood in the ventricle immediately before it contracts, or the preload
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refractory period
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the period during which a pulse generator is unresponsive to an electrical input signal, and during which it is impossible for the myocardium to respond. The period during which cardiac cell is readjusting its sodium & potassium levels & can't be depolarized again
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Heart Failure Class I
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patient not limited with normal physical activity by symptoms
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Heart Failure Class II
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ordinary physical activity results in fatigue, dyspnea, or other symptoms.
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Heart Failure Class III
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characterized by a marked limitation in normal physical activity
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Heart Failure Class IV
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defined by symptoms at rest or with any physical activity.
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digoxin
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Lanoxin
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