What is the PR interval in this ECG and what is the cardiac rate in this ECG? Le

Question

What is the PR interval in this ECG and what is the cardiac rate in this ECG?

Left leg Figure 7.8 Electrocardiograph leads. The placement of the bipolar limb leads (RA, LA, LL) and the positions (1-6) for the unipolar chest leads (Vi-V) for recording electrocardiograms. (RA = right arm; LA left arm; 1 is also connected to the electrocardiograph, but is not shown because it serves as the "ground For a full-color version of this figure, see fig. 13.24 i n Human Physiology, thirteenth edition, by Stuart I. Fox.) 1.0 PR 0 0 200 600 400 Milliseconds Figure 7.9 The normal electrocardiogram (ECG). (a) A labeled drawing, and (b) an ECG recording. (c) Set the sensitivity to 1 (most sensitive in your lab. The following instructions are valid only for a single-channel electrocardiograph (a) Turn on the power switch (d) Set the lead selector switch to the first d left of the STD or CAL position smeed selector switch to 25 mm (e) Turn the control or knob to the rn

Explanation / Answer

1. Answer = 5 large box= 200 millisecond= 0.5 mV= 5 mm

Explanation:- PR interval is the interval between p onset of p-wave to Q- wave

2. Cardiac rate = 300/ large box or 1500/ small box

=1500/24 =>63 beats / min.

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