Table 1: Table summarizing trial number, week of the trial, animal number, fetal position, need for laparotomy, and the time required to navigate the needle to the correct position in the left ventricle. The original computer-assisted navigation investigation involved 24 trials. Of these, 8 were done “freehand, ” that is, without computer-assisted navigation. These 8 trials are used in the current analysis.

Trial no.Week no.Animal no.PositionLap YES/NOTime to LV w/o Navigation

522 twin ATransverseYes12
622 twin BTransverseYes11
1033CephalicNo8
1646CephalicNo1
1847CephalicNo3
2048CephalicNo3
2148CephalicNo5
24510TransverseYes1