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

Table 4 Myocardial velocity and velocity-derived variables measured at right and left atrial myocardial walls.

Variables	*Level*	RA	IAS	LA-Lat	LA-Inf	LA-Ant	LA-Post	P*
Aa' peak vel.	Low	8.1 ± 2.7	6.3 ± 1.4	6.2 ± 1.7	6.9 ± 1.8	6.3 ± 1.8	6.8 ± 1.8	NS
(cm/s)	Mid	6.9 ± 2.4	5.2 ± 1.5	5.7 ± 1.4	5.1 ± 1.7	5.7 ± 1.8	5.4 ± 1.7	NS
	P	< 0.001	< 0.001	< 0.001	< 0.001	< 0.01	< 0.001
Aa' disp.	Low	6.7 ± 2.3	4.5 ± 0.9	3.7 ± 1.0	4.2 ± 1.0	4.1 ± 1.2	4.0 ± 0.9	NS
(mm)	Mid	5.8 ± 2.5	3.2 ± 0.9	3.4 ± 0.9	2.9 ± 0.7	3.1 ± 1.3	3.0 ± 0.8	NS
	P	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001
Aa' cont.	Low	31 ± 10	33 ± 8	29 ± 10	28 ± 7	31 ± 12	26 ± 6	NS
(%)	Mid	27 ± 11	24 ± 7	25 ± 9	19 ± 6	23 ± 11	19 ± 5	NS
	P	< 0.001	< 0.001	0.02	< 0.001	< 0.001	< 0.001
Aa' SR (s- ¹ )		-4.9 ± 0.8	-2.7 ± 0.7	-3.7 ± 0.9	-3.2 ± 0.8	-3.3 ± 1.0	-3.7 ± 1.0	0.001
Aa' S (%)		29 ± 7	14 ± 5	15 ± 4	16 ± 5	15 ± 6	16 ± 4	NS

Abbreviations: Aa' cont., atrial contribution; Aa' disp., atrial displacement; Aa' peak vel., atrial A-wave peak velocity; Aa' S, atrial strain; Aa' SR, atrial strain rate: P, paired t test; P*, analysis of variance; otherwise as in Table 3a.
Aa' peak vel Low: RA vs IAS, LA-Lat and LA-Ant (P < 0.001). No differences were found between any LA walls.
Aa' peak vel Mid: RA vs IAS, LA-Inf, LA-Post and LA-Ant (P < 0.001). No differences were found between any LA walls.
Aa' disp. Low and Mid: RA vs all walls (P < 0.001). No differences were found between any LA-walls.
Aa' cont. Low and Mid: No differences were found between walls
Aa' SR: RA vs all LA walls (P < 0.001), IAS vs LA-Lat and LA-Post (P < 0.001)
Aa' S: RA vs all LA walls (P < 0.001). No differences were found between any LA walls.

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