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) |