Table 2.
Electrophysiological Characteristics of 2° AVB Fetuses
| First fMCG
|
Last fMCG
|
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fetus # | GA (Weeks) | RX | FHR (beats/min) | FHR Pattern | QRS (ms) | PR (ms) | % NSR | # fMCG | GA (Weeks) | RX | FHR (beats/min) | FHR Pattern | QRS (ms) | PR (ms) | % NSR |
| 24 | 32 | — | 65 | R | 73–102 | 85 | 0 | 3 | 37 | D | 63 | R | 57 | 42–140 | 0 |
|
| |||||||||||||||
| 25 | 20 | — | 80 | R | 58 | 262 | 8.7 | 4 | 33 | D | 70 | R | 73 | 275–365 | 10.1 |
|
| |||||||||||||||
| 26 | 22 | — | 71 | R | 48 | 141 | 1.3 | 4 | 31 | D | 71 | R | 54 | 125–148 | 4.4 |
|
| |||||||||||||||
| 27 | 24 | — | 68 | R | 56 | 62–125 | 4 | 1 | |||||||
|
| |||||||||||||||
| 28 | 32 | — | 67 | R | 62 | 104 | 74 | 1 | |||||||
Fetus #27 had complex atrioventricular canal defect; fetus #28 had complex corrected transposition of the great arteries, the others had AVB in association with SSA antibodies; none required neonatal pacing.
PR = PR interval; % NSR = percent time in normal sinus rhythm; 2° = second degree; other abbreviations as in Table 1.