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. 2022 Sep 15;62(Suppl 1):S53–S66. doi: 10.1002/jcph.2129

Figure 2.

Figure 2

24‐week GA fetus with complex 2:1 isoimmune AV block, HR 75/min. (a) The signal averaged wave form, which documents 2 P waves for each QRS and a stable but prolonged PR interval. (b) Slow ventricular tachycardia is shown, which is common during the first several weeks of AV block. (c) Image shows that this fetus also had periods of rapid ventricular tachycardia and complete AV block with wide QRS escape rhythm (complete bundle branch block). These unstable findings are most common during the early adaptive phase, when the fetus is adjusting to the sudden drop in heart rate associated with AV block. AV, atrioventricular; CBBB, complete bundle branch block; GA, gestational age; VT, ventricular tachycardia.