Table 3.

Loss of signal between 27 and 32 weeks of GA

Study	Signal Acquisition Loss (%)
Abboud et al.,1990 [20] (n = 21)	None reported
Taylor et al.,2003 [24] (n = 199)	12.4%
Chia El et al.,2005 [22] (n = 178)	PR = 45.9%, QRS = 19.7%, QT = 27.9%
Taylor et al.,2005 [25] (n = 15)	None reported
Hayashi R et al.,2009 [23] (n = 48)	40% for < 36 weeks
Arya et al.,2015 [21] (n = 50)	33%
Yilmaz et al.,2015 (n = 64)	15%
Wacker-Gussmann et al.,2017 [26] (n = 117)	44%