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Table 3 Recording length

From: Signal-averaged P wave analysis for delineation of interatrial conduction – Further validation of the method

 

6 min

3 min

1 min

30 s

10 s

10 s LR

P dur

2.9 ± 18

-3.7 ± 15

1.9 ± 16

3.2 ± 17

1.4 ± 19

1.0 ± 18

Xmax pos

0.1 ± 4.7

-1.0 ± 5.8

0.6 ± 15

0.7 ± 13

0.8 ± 18

1.2 ± 18

Xmax amp

0.0 ± 0.4

0.0 ± 1.9

-0.1 ± 4.2

-0.2 ± 4.5

0.1 ± 5.6

-0.1 ± 5.7

Ymax pos

0.1 ± 4.8

-1.5 ± 8.6

-1.0 ± 7.7

-0.6 ± 10

-1.4 ± 11

-0.9 ± 11

Ymax amp

0.0 ± 0.6

-0.4 ± 4.7

-1.3 ± 13

-0.8 ± 14

0.2 ± 18

0.0 ± 17

Zmin pos

0.1 ± 4.7

-0.9 ± 5.7

0.6 ± 9.3

-0.2 ± 9.0

-1.6 ± 12

-1.1 ± 11

Zmin amp

0.1 ± 0.7

-0.1 ± 2.0

0.4 ± 5.0

0.3 ± 4.1

0.7 ± 6.1

0.9 ± 6.2

Zzero pos

0.0 ± 0.4

-1.0 ± 5.5

0.9 ± 9.2

0.1 ± 8.8

-1.5 ± 12

-0.7 ± 12

Zmax pos

0.1 ± 21

-4.6 ± 22

-2.3 ± 23

-2.2 ± 27

-1.0 ± 31

-1.8 ± 29

Zmax amp

0.1 ± 3.1

-0.7 ± 4.3

-1.7 ± 14

-0.7 ± 7.4

0.7 ± 12

0.1 ± 12

Nadir pos

-0.6 ± 10.2

-2.5 ± 17

-0.5 ± 12

-0.4 ± 12

-1.0 ± 17

1.9 ± 27

Classification

98%

100%

96%

96%

98%

98%

  1. Median error, in percentage, and corresponding 95% limits of agreement (derived from the Bland-Altman analysis) of the measured P wave morphology parameters, as a function of the recording length. The row Classification gives the percentage correctly classified. All comparisons were made using a standard 6-min recording. (LR = low signal resolution)