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GRID AND WAVES
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Gravity
Terms in this set (23)
The horizontal axis represents
Time
1 mm = one small box (0.04 SEC) . Five small boxes = 5 mm (0.2 seconds) Five large boxes = 1 sec.
Vertical axis represents
Amplitud (voltage) 1 mm = 0.1 mv
1 mv what deflection produces?
A deflection of 10 mm. (standarization)
Vertical axis (two large squares=
1mV
Vertical axis (one large square =
0.5 mV
Vertical axis(one small square=
0.1 mV)
Waveform
Are movement away from the isolectric line (either upward of downward)
Segment
Line between two waveforms
Interval
Wave plus a segment
Complex
Several waveforms
P wave
Is the first deflection after diastole (is a smooth round no more than 2.5 mm high and no more than 0.11 sec.
QRS Complex
Is no longer than .12 seconds., three small boxes.
T wave
Slightly asymmetric, no more than 5 mm in height
U wave (rep. of Purkinje fibers)
Round and symmetric, no more less than 1.5 mm in height
Q wave
Is the first negative deflection produced by ventricular depolarization
R wave
First positive deflection produce by ventricular depolarization
S wave
negative deflection of ventricular depolarization
T wave is
ventricular repolarization (no more than 5 mm in height)
QRS complex duration
no more than .12 sec (less than 3 small boxes) or 0.1 sec
Prominent U wave is due to:
Hypokalemia
A complex is form by
Several waves
ST segment
represent the time of ventricular contraction and the beginning of repolarization
J POINT
Is where the QRS complex ends and the ST segment begins
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