Table 2.

The mean values from 18 weeks of gestation to term for the myocardial time intervals and velocities during a cardiac cycle, as well as the Tei index and e’/a’ ratio

Variable	Abbreviation	Septum	Left ventricular free wall	Right ventricular fee wall
Time intervals (ms)
Atrial contraction	P1	67 / 83 (r = 0,344)	61 / 84 (r = 0,317)	81 / 94 (r = 0,214)
Pre ejection	P2	23 (11–56)	24 (9–54)	26 (0–76)
Ventricular ejection	P3	180 (95–277)	184 (126–245)	182 (95–303)
Post ejection	P4	63 / 41 (r = 0,441)	61 / 36 (r = 0,353)	49 (17–87)
Rapid filling	P5	71 / 109 (r = 0,403)	74 / 100 (r = 0,393)	72 / 98 (r = 0,416)
Slow filling	P6	8 / 110 (r = 0,287 )	4 (0–44)	3 (0–36)
Tei index		0,42 (0,13 – 0,64)	0,41 (0,17 – 0,85)	0,41 (0,14 – 0,89)
Peak velocities (cm/s)
Atrial contraction	a’	−2,4 / –3,9 (r = 0,387)	−1,9 / –4,0 (r = 0,375)	−4,0 / −6,2 (r = 0,421)
Pre ejection (pos)	pre’pos	0,4 / 1,1 (r = 0,427)	0,3 / 2,0 (r = 0,489)	0,7 / 3,0 (r = 0,553)
Pre ejection (neg)	pre’neg	−0,1 (−2,8 – 1,5)	−0,1 (−1,3 – 0,3)	−0,1 (−1,3 – 3,7)
Ventricular ejection	s’	1,5 / 2,9 (r = 0,566)	1,1/ 2,8 (r = 0,512)	1,7 / 4,7 (r = 0,599)
Post ejection (neg)	post’neg	−0,3 (−1,8 – 1,0)	−0,3 (−4,2 – o,9)	−0,4 (−6,9 – 0,8)
Post ejection (pos)	post’pos	0,3 / 1,0 (r = 0,395)	0,3 (−0,8 – 2,8)	0,4 (−5,0 – 2,7)
Rapid filling	e’	−1,3 / −3,3 (r = 0,509)	−1,2 / −3,1 (r = 0,528)	−1,4 / −4,6 (r = 0,527)
Slow filling	p6’	−0,5 / −1,3 (r = 0,373)	−0,7 (−4,9 – 2,8)	−1,9 (−6,7 – 3,5)
e’/a’		0,54 / 0,84 (r = 0,316)	0,56 / 0,84 (r = 0,358)	0,45 / 0,79 (r = 0,438)

The variables that significantly changed throughout gestation are presented as mean values, where the nominator represents the mean value at 18 weeks of gestation and the denominator represents the mean value at term. The r-value is Pearson’s correlation coefficient, the correlation to advancing gestational age. The variables that did not show any significant change with gestational age are presented as median values within a range.