The normal width of the QRS complex is which of the following? (Select all that apply.)
a. 0.06 to 0.10 seconds.
b. 0.12 to 0.20 seconds.
c. 1.5 to 2.5 small boxes.
d. 3.0 to 5.0 small boxes.
e. 0.04 seconds or greater.
A, C
The waveform that initiates the QRS complex (whether it is a Q wave or an R wave) marks the beginning of the interval. The normal width of the QRS complex is 0.06 to 0.10 seconds. This width equals 1.5 to 2.5 small boxes. The normal PR interval is 0.12 to 0.20 seconds, three to five small boxes wide; not the QRS interval. A pathological Q wave has a width of 0.04 seconds and a depth that is greater than one fourth of the R wave amplitude; therefore, the QRS complex would be wider than that.
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