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Table 2 Cardiac Time intervals as per the WHO classification

From: A systematic review of cardiac time intervals utilising non-invasive fetal electrocardiogram in normal fetuses

Study N Early pre– term (≤ 32 weeks) Late pre– term (32–37 weeks) Term (≥ 37 weeks)
(ms)   QT CI QRS CI PR CI QT CI QRS CI PR CI QT CI QRS CI PR CI
Abboud et al. (1990) [20] 21        264 224–302 46.3 44–49 103 88–117 245 225–265 46.4 43–50 115.8 91–141
Taylor et al. (2003) [24] 199 251 289–304 47 61–65 102 110–114        259 306–321 55 70–75 105 133–142
Chia et al. (2005) [22] 374 228.4 219–239 49.4 45–54 105.6 99–118 235 230–240 51 48–52 110 107–113 243 239–245 63 51–55 110 108–112
Taylor et al. (2005) [25] 15 255   62   92.5         256   56   103.8  
Hayashi R et al. (2009) [23] 48          57       52    
Arya et al. (2015) [21] 13    96   132.8     85   128     76   135  
Yilmaz et al. (2015) 64 235.5   54 47–57 97.5 91–105 233   56 49–63 109 89–110       
Wacker Gussmann et al. (2017) [26] 117        253 247–259 50.3 49–51 107.3 103–110 250 246–254 53 52–54 108 104–112
  1. CI- 95% Confidence interval