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Table 2 Myocardial velocities before intrauterine transfusion (n = 70). Absolute values and z-scores

From: Fetal cardiac function at intrauterine transfusion assessed by automated analysis of color tissue Doppler recordings

Variable LV IVS RV
Mean (±SD) Mean z-score (95% CI) Mean (±SD) Mean z-score (95% CI) Mean (±SD) Mean z-score (95% CI)
(cm/sec)   (cm/sec)   (cm/sec)  
Myocardial velocities
 Am 4.27 (±1.46) 0.31a (0.06–0.56) 4.03 (±1.01) 0.28a (0.08–0.48) 5.83 (±1.46) 0.12 (−0.16–0.40)
 Sm 2.77 (±1.11) 0.34a (0.08–0.61) 2.84 (±0.68) 0.52a (0.28–0.77) 3.66 (±1.14) 0.30a (0.03–0.57)
 Em 3.55 (±1.19) 0.48a (0.24–0.73) 3.38 (±0.96) 0.26a (0.05–0.47) 4.20 (±1.28) 0.12 (−0.12–0.35)
Em/Am ratio 0.90 (±0.36) 0.20 (−0.05–0.44) 0.87 (±0.28) −0.01 (− 0.21–0.18) 0.76 (±0.26) 0.09 (− 0.15–0.34)
  1. Values are presented as absolute values and z-scores created from published reference data
  2. aindicates significance according to 95% confidence interval (CI)
  3. LV, left ventricular wall; IVS, interventricular septum; RV, right ventricular wall; Am, peak myocardial velocity during atrial contraction; Sm, peak myocardial velocity during ventricular ejection; Em, peak myocardial velocity during rapid ventricular filling; SD, standard deviation