By Bryan J.L. Glass

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36. shows other forms of W patterns that are not codable as QS-waves Fig. 4-37 Q/R ratio R peak = 10 mm. Q nadir = 5 mm. 37. The ratio of the Q- to R-wave amplitude is also important in coding. Remember that the amplitude of the R-wave is measured from the upper margin of the preceding P-R baseline, and the Q-wave amplitude is measured from the lower margin 33 Fig. 03 sec. • Q/R ratio ≥ 1/3 Q=5mm Fig. 39. Q- or QS-waves are never coded in lead aVR. The Q-QS wave code depends on the leads in which they occur, the duration, the amplitude of the Q-wave, and the Q/R ratio.

This shoulder is included in the measurement of the Q-wave and illustrated in (a) or there may be smaller negative deflections before the main negative Q. These initial negative deflections count as the start of the Q-wave and are illustrated in (b) Fig. 15. The use of a loupe to measure Q-wave duration 22 1 2 Fig. 05 sec. 06 sec. Fig. 03 sec. 04 sec. 02s duration in >50% (a majority) of beats. It is not necessary to measure the duration of QS-waves for coding 23 Fig. 4-16 measure vertically from the onset of the QRS to the peak of the R Fig.

35. Other forms of QS-waves 32 Fig. 4-36 no QS waves • negative component < 1mm. • no Q or QS • terminal R ≥ 1 mm. 25 mm. 36. shows other forms of W patterns that are not codable as QS-waves Fig. 4-37 Q/R ratio R peak = 10 mm. Q nadir = 5 mm. 37. The ratio of the Q- to R-wave amplitude is also important in coding. Remember that the amplitude of the R-wave is measured from the upper margin of the preceding P-R baseline, and the Q-wave amplitude is measured from the lower margin 33 Fig. 03 sec. • Q/R ratio ≥ 1/3 Q=5mm Fig.

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Thor: First Thunder #3 Jan 2011 by Bryan J.L. Glass


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