Disorders of Cardiac Function, Cardiac Function and Rythms

Finally, yes! still need to refer to book for better understanding

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Cards In This Set

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