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ECG: Key terms

Interpretation of Electrocardiogram Tracings CH 11

Action Potential a brief reversal in the electrical potential difference across a nerve cell or muscle fiber membrane that occurs in response to a stimulus
Atrial Kick the added filling of the ventricles during diastole caused by atrial contractions
Automaticity the ability of cardiac tissue ti stimulate depolarization spontaneously
Depolarization an electrical change in an excitable cell in which the inside becomes positive; associated with contraction of cardiac muscle cells
Dysrhythmia any deviation of the heart's normal sinus rhythm
Ectopic impulse a heartbeat originating outside the SA node
Escape beat a heartbeat that originates outside the sinus node after a period of SA node inactivity
First -Degree heart block a dysrhythmia in which the PR interval is prolonged, exceeding 200 msec; there are no missed beats, and the rhythm typically is regular
Focus the site within the heart from which an ectopic impulse originates
Heart block a category of dysrhythmias caused by defective transmission of the heart's electrical impulses through its conducting system
Hypertrophy as applied to the heart, a pathologic increase in the bulk of the myocardial fibers, typically due to a chronic increase in afterload
QRS Complex central and most visually obvious part of an ECG tracing. It corresponds to the depolarization of the right and left ventricles of the human heart.
QT Interval time between the start of the Q wave and the end of the T wave in an ECG that represents electrical depolarization and repolarization of the left and right ventricales
Repolarization the return of a negative charge within the cell; occurs during relaxation of the myocardial cells
RR interval the time elapsing between two consecutive R waves in an ECG
ST segment the interval between the end of the QRS complex and T wave
ST-Elevation Myocardial Infarction (STEMI) a type of "heart attack" or myocardial infarction characterized by the elevation in the ST segment
Created by: ginger0701