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Definition
| a disruption in cardiac rate or rhythm. |
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| of heart cells to generate an action potential without an external stimulus. |
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Definition
| a period of cardiac muscle relaxation (diastole) followed by a period of contraction (systole) in the heart.prothrombin; thrombin then breaks down fibrin threads from fibrinogen to form a clot.formation of thrombin from prothrombin; thrombin then breaks down fibrin threads from fibrinogen to substances formed in the liver – many requiring vitamin K – that react in a cascading sequence to cause the formation of thrombin from prothrombin; thrombin then breaks down fibrin threads from fibrinogen to form a clot. |
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Definition
| property of heart cells to rapidly conduct an action potential of electrical impulse. |
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Definition
| an electrical tracing reflecting the conduction of an electrical impulse through the heart muscle; does not reflect mechanical activity. |
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Definition
| the normal pacemaker of the heart; composed of primitive cells that constantly generate an action potential. |
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Term
| Starling’s law of the heart |
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Definition
| addresses the contractile properties of the heart: the more the muscle is stretched, the stronger it will react, until it is stretched to a point at which it will not react at all. |
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Definition
| discomfort with respirations, often with a feeling of anxiety and inability to breathe, seen with left-sided heart failure. |
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Definition
| rapid and shallow respirations, seen with left-sided heart failure. |
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Definition
| end result of vessel blockage in the heart; leads to ischemia and then necrosis of the area cut off from the blood supply; it can heal, with the dead cells replaced by scar tissue. |
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| characterized by progressive narrowing of coronary arteries, leading to a decreased delivery of oxygen to cardiac muscle cells; leading killer of adults in the western world. |
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Definition
| drop in blood flow through the coronary arteries caused by a vasospasm in the artery, not by atherosclerosis. |
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Definition
| pain due to the imbalance of myocardial oxygen supply and demand that is relieved by rest or stoppage of activity. |
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Definition
| episode of myocardial ischemia with pain due to the imbalance of myocardial oxygen supply and demand when the person is at rest. |
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Definition
| faster-than-normal heart rate (usually greater than 100 beats/min). |
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Definition
| cardiac arrhythmia originating within the ventricles; isolated ventricular contractions are referred to as premature ventricular contractions. |
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Definition
| any irregularity in rate and rhythm which arises in the atrium. |
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Definition
| an abnormal enlargement of the heart. |
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Definition
| substances effecting the rate or rhythm of the heartbeat. |
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Term
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Definition
| substances that alter the force or energy of muscular contractions |
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Definition
| a condition in which a problem with the structure or function of the heart impairs its ability to supply sufficient blood flow to meet the body’s needs. |
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Term
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Definition
| the circulation of the blood in the blood vessels of the heart muscle. |
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