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. Author manuscript; available in PMC: 2011 Nov 14.
Published in final edited form as: Arthritis Rheum. 2010 Apr;62(4):1138–1146. doi: 10.1002/art.27308

Figure 1. Mechanical Doppler PR interval for CHB and non-CHB pregnancies.

Figure 1

The figure illustrates the mean and SD calculated for each gestational week. For the non-CHB group, values between 16 and 34 weeks are shown. For the CHB group, only values prior to CHB detection are shown. The dashed lines represent the Mean + 3SD and the Mean − 3SD values respectively. The PR intervals for the CHB fetuses are all within normal range (Mean+/− 3SD) and thus 1st degree block did not precede advanced CHB.