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Table 3 Time intervals expressed in milliseconds measured at low and mid atrial levels in the myocardial walls of the RA and LA.

From: Assessment of atrial regional and global electromechanical function by tissue velocity echocardiography: a feasibility study on healthy individuals

Variables Level RA IAS LA-Lat LA-Inf LA-Ant LA-Post P*
P-Aa' start Low 51 ± 11 59 ± 9 69 ± 11 62 ± 10 70 ± 10 62 ± 11 < 0.001
(ms) Mid 38 ± 9 47 ± 8 57 ± 9 51 ± 11 59 ± 10 52 ± 11 < 0.001
  P < 0.001 < 0.001 < 0.001 < 0.001 < 0.001 < 0.001  
P-Aa' peak Low 117 ± 22 108 ± 14 119 ± 14 108 ± 12 123 ± 14 107 ± 11 <0.001
(ms) Mid 110 ± 20 104 ± 15 115 ± 15 98 ± 17 123 ± 16 99 ± 17 < 0.01
  P 0.06 0.04 0.1 < 0.001 0.9 < 0.001  
Aa'-dur. Low 135 ± 16 120 ± 16 106 ± 10 118 ± 13 113 ± 12 112 ± 12 < 0.001
(ms) Mid 145 ± 19 127 ± 16 117 ± 10 115 ± 12 121 ± 16 115 ± 12 < 0.01
  P < 0.001 < 0.001 < 0.001 0.1 < 0.001 0.07  
TEMA Low 186 ± 17 179 ± 18 175 ± 15 179 ± 15 183 ± 14 174 ± 12 0.07
(ms) Mid 183 ± 21 174 ± 16 173 ± 15 175 ± 15 180 ± 19 167 ± 17 0.2
  P 0.3 0.1 0.5 0.1 0.3 0.06  
  1. Abbreviations: Aa'-dur., duration of the A wave; IAS, inter-atrial septum; LA-Ant, left atrial anterior wall; LA-Inf, inferior left atrial wall; LA-Lat, left lateral atrial wall; LA-Post, left posterior atrial wall; ms, milliseconds; P, by paired t test; P*, by analysis of variance; P-Aa' start, time from the beginning of the P-wave to the start of the A-wave; P-Aa' peak, time from the beginning of the P-wave to the peak of the A-wave; RA, right atrial wall; TEMA, total electromechanical activity.
  2. P-Aa' start Low: RA vs all LA-walls (P < 0.001), IAS and LA-Inf vs LA-Lat (P < 0.001)
  3. P-Aa' start Mid: RA vs all LA-walls (P < 0.01), IAS vs LA-Lat and LA-Ant (P < 0.001); LA-Inf vs LA-Lat and LA-Inf (P < 0.001); LA-Post vs LA-Ant (P < 0.01)
  4. P-A'a peak Low and Mid: IAS, LA-Inf and LA-Post vs LA-Lat and LA-Ant (P < 0.001 for all comparisons)
  5. Aa' dur. Low: RA, IAS and LA-Inf vs LA-Lat (P < 0.001)
  6. Aa' dur. Mid: RA vs all walls (P < 0.001), IAS vs LA-Lat, LA-Inf and LA-Post (P < 001)
  7. TEMA Low: RA vs LA-Lat, LA-Inf and LA-Post (P < 0.001). No differences among all LA-walls.
  8. TEMA Mid: RA vs LA-Lat, LA-Inf, LA-Post (P < 0.001), LA-Ant vs LA-Inf and LA-Post (P < 0.001)