Making labor safer for
women and their babies
Caitlin McDonnell 1 ; Reza Sameni, PhD 2,3 ; Jay Ward 3 ; Jim Robertson 3 ;
Adam Wolfberg, MD, MPH 3,4 ; Gari Clifford, PhD,1,3
1University of Oxford, 2Shiraz University, 3MindChild Medical, Inc.,
4Tufts Medical Center
Evaluation of the T/R ratio - the
metric used by the STAN™
monitor - improves the accuracy of intra-partum fetal assessment when combined with fetal heart rate monitoring, but typically requires a fetal scalp electrode (FSE). Noninvasive measurement of the T/R ratio would make this metric more widely available.
To compare fetal T/R ratio measured using sensors on the maternal abdomen to the fetal T/R ratio acquired using a FSE.
Data were acquired from 27 term laboring women who had a FSE placed for a clinical indication. 31 channels of abdominal data were recorded simultaneously with the FSE.
The average T/R ratio level was estimated from 79 30-second segments from the FSE and the abdominal data for 4 subjects. A comparison was performed to assess the correlation between the fetal T/R ratio derived from abdominal sensors and T/R ratio measured using the FSE.
The difference between the T/R ratio calculated from the scalp electrode and the T/R ratio calculated from the extracted abdominal fetal ECG was 0.0064 ± 0.014. This difference is not clinically meaningful.
We measured the fetal T/R ratio was accurately measured using abdominal electrodes in non-ischemic fetuses.
Variation in T/R ratio between
FSE and abdominal sensors.
Disclosure: The authors, except for Ms. Pettigrew, hold equity in MindChild Medical, Inc., which has licensed intellectual property used to generate results presented in this abstract.
Comparison of ECG waveform from
the FSE and abdominal sensors.
The T‐ and R‐waves are illustrated.
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