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12 Cards in this Set
- Front
- Back
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What is an 'ectopic pacemaker'?
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An ectopic pacemaker or ectopic focus is an excitable group of cells that causes a premature heart beat outside the normally functioning SA node of the human heart. Acute occurrence is usually non-life threatening, but chronic occurrence can progress into tachycardia, bradycardia or ventricular fibrillation
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An ectopic pacemaker or ectopic focus is an excitable group of cells that causes a premature heart beat outside the normally functioning SA node of the human heart. Acute occurrence is usually non-life threatening, but chronic occurrence can progress into tachycardia, bradycardia or ventricular fibrillation
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An ectopic pacemaker
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What is the 'pacemaker potential'?
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The slow, positive increase in voltage across the cell's membrane (the membrane potential) that occurs between the end of one action potential and the beginning of the next action potential
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The slow, positive increase in voltage across the cell's membrane (the membrane potential) that occurs between the end of one action potential and the beginning of the next action potential
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'Pacemaker potential'
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Define 'Excitation-contraction coupling'
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A term used to describe the physiological process of converting an electrical stimulus to a mechanical response. This process is fundamental to muscle physiology, whereby the electrical stimulus is usually an action potential and the mechanical response is contraction. EC coupling can be dysregulated in many disease conditions.
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A term used to describe the physiological process of converting an electrical stimulus to a mechanical response. This process is fundamental to muscle physiology, whereby the electrical stimulus is usually an action potential and the mechanical response is contraction. EC coupling can be dysregulated in many disease conditions.
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Excitation-contraction coupling
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What is 'Cardiac contractility'?
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The intrinsic ability of the heart to contract independent of preload and afterload.
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The intrinsic ability of the heart to contract independent of preload and afterload
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Cardiac contractility
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What is 'afterload' (cardiology)?
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A measure of the tension produced by a specified chamber of the heart in order to contract.
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A measure of the tension produced by a specified chamber of the heart in order to contract
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Afterload. (Cardiology)
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What is 'preload' (cardiology)?
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The end volumetric pressure that stretches the left ventricle of the heart to its greatest geometric dimensions under variable physiologic demand.
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The end volumetric pressure that stretches the left ventricle of the heart to its greatest geometric dimensions under variable physiologic demand.
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Preload. (Cardiology)
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