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Cards In This Set
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Cardiac action potential definition
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Electr.activity of cells of heart. differs significantly in different portions of the heart
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Cardiac action potential different phases
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Phase 0: rapid depolarization; P1: early repol; P 2: plateau phase(stable stage); p3: rapid repolarization; p 4: resting stable (diatole)
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Cardiac conduction of the heart
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SA node, AV node, Perkinje Fibers
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SA node
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Primary pace maker of hear; begins the heart beat; rate is 60-100
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Importance of Digoxin for heart
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Used for heart failure; increase contractibility of heart; makes heart pump efficiently but slow down HR; watch for toxicity
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Depolarization means the ventricles are
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Contracting; systole
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Repolarization means the ventrilcles are
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Relaxing or left ventricles are filling up; diastole
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P, QRS, T on ECG
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P: atrial depolarization
QRS: ventricle depolarization
T: ventricle repolarization
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What is normal when reading P, PR, QRS,and QT intervals? how should a T wave look?how should ST segmt be?
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P: (.08-.12) PR (.12-.20)QRS: (.06-.10)
T ( look smooth) QT interval (
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During P wave
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Atrial depolarization occurs; atrial contract
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During QRS complex
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Ventricles contract (systole); ventricular depolarization
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How to interpret an ECG?
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Whether it is regular or not (RR or PP intervals), whether rate is norma (60-100) fast (tachyc. >100) or slow (bradyc.
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Pericardium
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Sac surrounding heart. isolates heart from thoracic structures; prevents overfilling;keeps symmetry
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Pericardial effusion
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Accumullation of fluid in the pericardial cavity
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Cardiac temponade
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Slow or rapid compression of heart d/ accumulation of lfuid, pus, blood in sac
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