Table 2 Impact of clinical parameters on LA and LAA size.

From: Different Responses of Left Atrium and Left Atrial Appendage to Radiofrequency Catheter Ablation of Atrial Fibrillation: a Follow Up MRI study

 

No late recurrence (n = 45)

Late recurrence (n = 78)

p value (between group)

Mean

SD

p value (pre and post)

Mean

SD

p value (pre and post)

Baseline LA

93.4

31.7

 

105.7

48.4

 

0.153

F/U LA

69.6

25.2

 

77.0

29.6

 

0.166

∆ LA

−23.7

19.5

<0.001

−25.6

29.2

<0.001

0.716

Baseline LAA

20.4

6.7

 

18.9

9.3

 

0.336

F/U LAA

23.6

8.4

 

23.8

15.4

 

0.921

∆ LAA

3.1

5.4

<0.001

5.0

9.2

<0.001

0.218

 

Paroxysmal (n = 53)

Non-paroxysmal (n = 70)

 

Baseline LA

83.7

35.3

 

114.9

44.3

 

<0.001

F/U LA

66.0

23.1

 

80.4

30.2

 

0.004

∆ LA

−18.9

27.5

<0.001

−29.6

23.8

<0.001

0.034

Baseline LAA

19.3

6.3

 

19.6

9.9

 

0.834

F/U LAA

22.6

7.7

 

24.5

16.4

 

0.433

∆ LAA

3.4

5.3

<0.001

5.0

9.6

<0.001

0.254

 

PVI only (n = 46)

PVI + Substrate modification (n = 77)

 

Baseline LA

77.8

23.6

 

117.0

46.5

 

<0.001

F/U LA

65.0

24.5

 

79.7

28.9

 

0.005

∆ LA

−12.1

19.3

<0.001

−33.5

26.3

<0.001

<0.001

Baseline LAA

20.2

6.5

 

19.0

9.5

 

0.420

F/U LAA

23.8

8.3

 

23.7

15.6

 

0.957

∆ LAA

3.6

5.5

<0.001

4.7

9.2

<0.001

0.459

 

No anterior line block (n = 92)

Anterior line block (n = 31)

 

Baseline LA

97.6

42.3

 

113.7

45.2

 

0.108

F/U LA

74.7

28.2

 

73.0

28.6

 

0.780

∆ LA

−20.8

23.9

<0.001

−39.1

28.1

<0.001

0.002

Baseline LAA

19.9

7.3

 

18.0

11.3

 

0.380

F/U LAA

23.5

8.5

 

24.2

22.4

 

0.873

∆ LAA

3.7

5.6

<0.001

6.2

12.8

0.012

0.127

  1. F/U: follow up; LA: left atrium; LAA: left atrial appendage; PVI: pulmonary vein isolation; SD: standard deviation.