Chapter 3: Waveforms, Intervals, Segments, and Complexes

atrial depolarization
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0.10 secondsnormal QRS complex time?abnormal QRS-wide with duration of 0.12 seconds or more -most commonly cured by an electrical impulse that originates in a pacemaker site in the ventricles -also frequently occurs as a result of a bock in the bundle branchesQS complex (not a negative R wave since al R waves are positive)if the *entire QRS is negative* it is termed as a _____ _____early ventricular depolarizationwhat does the *ST segment* represent?ST segment_____ _____ is a *flat line between QRS complex and T wave*; should be located at *baseline*ST elevation myocardial infarction (STEMI) and pericarditisabnormal ST segment occurs when the *ST segment is elevated above the baseline*... what commonly causes this?non-ST elevation myocardial infarction (non-STEMI) and myocardial ischemiaabnormal ST segment occurs when the *ST segment is depressed below the baseline*... what commonly causes this?ventricular repolarizationwhat does the *T wave* represent?asymmetricalnormal T wave is rounded and slightly _____ because it gradual.y slopes to peak and returns more abruptly to baselinehyperkalemia (could also be due to acute MI, myocardial ischemia)with an *abnormal T wave* what electrolyte do you suspect?the time between the *onset of ventricular depolarization and the end of ventricular repolarization*what does the *QT interval* represent?2*QT interval* can only be accurately measured if rhythm is regular for at least _____ cardiac cycles before the measurement0.34-0.44 seconds (9-11 boxes)normal *QT interval time*?Mg2+ (electrolyte imbalances, bradycardia rhythms, psychotropic drugs)a *prolonged QT interval* could be due to which electrolyte?U wavewhich wave? -small deflection sometimes seen following the T wave -represents *late depolarization* (probably small segment of ventricles) -best seen when *heart rate is slow*hypokalemiawhat could cause an *abnormal U wave*?